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New Cancer Treatment? Universal Donor

Immune Cells

ScienceDaily (July 26, 2011)

One of the latest attempts to boost the body's defenses againstcancer is called adoptive cell transfer, in which patients receive a therapeutic injection of theirown immune cells. This therapy, currently tested in early clinical trials for melanoma andneuroblastoma, has its limitations: Removing immune cells from a patient and growing themoutside the body for future re-injection is extremely expensive and not always technicallyfeasible.

Weizmann Institute scientists have now tested in mice a new form of adoptive cell transfer, which

overcomes these limitations while enhancing the tumor-fighting ability of the transferred cells. The

research, reported recently in Blood, was performed in the lab of Prof. Zelig Eshhar of the Institute's

Immunology Department, by graduate student Assaf Marcus and lab technician Tova Waks.

The new approach should be more readily applicable than existing adoptive cell transfertreatments because it relies on a donor pool of immune T cells that can be prepared in advance,rather than on the patient's own cells. Moreover, using a method pioneered by Prof. Eshhar morethan two decades ago, these T cells are outfitted with receptors that specifically seek out andidentify the tumor, thereby promoting its destruction.

In the study, the scientists first suppressed the immune system of mice with a relatively milddose of radiation. They then administered a controlled dose of the modified donor T cells. Themild suppression temporarily prevented the donor T cells from being rejected by the recipient,but it didn't prevent the cells themselves from attacking the recipient's body, particularly thetumor. This approach was precisely what rendered the therapy so effective: The delay in therejection of the donor T cells gave these cells sufficient opportunity to destroy the tumor.

If this method works in humans as well as it did in mice, it could lead to an affordable celltransfer therapy for a wide variety of cancers. Such therapy would rely on an off-the-shelf poolof donor T cells equipped with receptors for zeroing in on different types of cancerous cells.

Prof. Zelig Eshhar's research is supported by the M.D. Moross Institute for Cancer Research; theKirk Center for Childhood Cancer and Immunological Disorders; the Leona M. and Harry B.Helmsley Charitable Trust 50; and the estate of Raymond Lapon.

In Pregnancy, Diabetes-Obesity Combo aMajor Red Flag

ScienceDaily (July 25, 2011) Type 2 diabetes and obesity in pregnancy is a daunting duo,according to new research published this month in TheJournal of Maternal-Fetal and Neonatal


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Medicine. The study shows that both conditions independently contribute to higher risks,opening the door to a wide range of pregnancy, delivery and newborn complications.

Study authors say the findings are important because obesity and type 2 diabetes areskyrocketing in women of childbearing age. A study in The Journal of the American Medical

Association reports that between 2007 and 2008 the prevalence of obesity among adult women inthe United States was more than 35 percent. A report from the Centers for Disease Control andPrevention states that approximately 11 percent of women above the age of 20 had diabetes in2010.

Loralei Thornburg, M.D., senior study author and a high-risk pregnancy expert at the Universityof Rochester Medical Center, emphasizes that the research is needed now more than ever."We've never seen the degree of obesity and type 2 diabetes in women that we are seeing rightnow, because for a very long time diabetes was a disease of an older population, so we rarelydealt with it in prenatal care. We hope this new knowledge will help physicians better understandand care for this rapidly expanding group of high-risk women."

While numerous studies have established that obesity, in the absence of diabetes, is associatedwith problems in pregnancy -- preterm birth, birth trauma, blood loss and a prolonged hospitalstay, to name a few -- less is known about type 2 diabetes and what causes difficulties when thetwo conditions coexist. Researchers from Rochester wanted to determine if obesity aloneaccounts for the increased risks in this "dual-diagnosis" group, or if diabetes plays a role as well.

To determine the influence of obesity and type 2 diabetes when the conditions coexist inpregnancy, Thornburg and lead study author Kristin Knight, M.D., used clinical records and thehospital's birth certificate database to identify 213 pairs of women who delivered babies at theMedical Center between 2000 and 2008. Each pair included a diabetic and a non-diabetic patient

with approximately the same pre-pregnancy body mass index (BMI). The majority of women inthe study were overweight, obese or morbidly obese.

"We matched the pairs pound for pound, because if obesity was the main problem, we'd seesimilar outcomes between women, whether they had diabetes or not. But if we saw differentoutcomes between pairs, we'd know the diabetes was impacting outcomes as well," saidThornburg.

Using mathematical models and controlling for outside factors, such as age and tobacco use,researchers found that the patients with type 2 diabetes had overall worse pregnancy, deliveryand newborn outcomes than their BMI-matched counterparts. Specifically, diabetic patients hadhigher rates of preeclampsia, cesarean delivery, shoulder dystocia, preterm delivery, large forgestational age infant, fetal anomaly and admission to the neonatal intensive care unit.

"Women and their physicians need to be aware that each condition on its own increases risk inpregnancy, so when they coexist the situation is even more worrisome," said Knight, a maternalfetal medicine fellow at Rochester. "Pregnancy is a time of great change, and fortunately manywomen are very open to making modifications during this period in their life. Anything a woman


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can do to improve her condition, from controlling blood sugar and exercising, to eating nutritiousfoods and maintaining an optimal weight, will help her deliver a healthier baby."

Knight originally focused her research on the effects of type 1 and type 2 diabetes on pregnancy.In a previous study, she found that women with type 2 diabetes, most of whom were also obese,

had poorer outcomes. Consequently, her research turned to obese, type 2 diabetics and theirexperiences in pregnancy.

"If a woman enters pregnancy obese, but hasn't developed type 2 diabetes, she is in a better placethan if she had both," concluded Thornburg.

In addition to Knight and Thornburg, Eva K. Pressman, M.D., and David N. Hackney, M.D.,from the Medical Center, also participated in the research.

Corporal Punishment May Have Long-Term

Negative Effects On Children's IntelligenceScienceDaily (July 26, 2011) Children in a school that uses corporal punishment performedsignificantly worse in tasks involving "executive functioning" -- psychological processes such asplanning, abstract thinking, and delaying gratification -- than those in a school relying on milderdisciplinary measures such as time-outs, according to a new study involving two private schoolsin a West African country.

The findings, published by the journal Social Development, suggest that a harshly punitiveenvironment may have long-term detrimental effects on children's verbal intelligence and their

executive-functioning ability. As a result, children exposed to a harshly punitive environmentmay be at risk for behavioral problems related to deficits in executive-functioning, the studyindicates.

The study -- by Prof. Victoria Talwar of McGill University, Prof. Stephanie M. Carlson of theUniversity of Minnesota, and Prof. Kang Lee of the University of Toronto, involved 63 childrenin kindergarten or first grade at two West African private schools. Their families lived in thesame urban neighborhood. The parents were largely civil servants, professionals and merchants.

In one school, discipline in the form of beating with a stick, slapping of the head, and pinchingwas administered publicly and routinely for offenses ranging from forgetting a pencil to being

disruptive in class. In the other school, children were disciplined for similar offenses with the useof time-outs and verbal reprimands.

While overall performance on the executive-functioning tasks was similar in the youngerchildren from both schools, the Grade 1 children in the non-punitive school scored significantlyhigher than those in the punitive school. These results are consistent with research findings thatpunitive discipline may make children immediately compliant -- but may reduce the likelihood


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that they will internalize rules and standards. That, in turn, may result in lower self-control aschildren get older.

"This study demonstrates that corporal punishment does not teach children how to behave orimprove their learning," Prof. Talwar said. "In the short term, it may not have any negative

effects; but if relied upon over time it does not support children's problem-solving skills, or theirabilities to inhibit inappropriate behaviour or to learn."

Despite the age-old debate over the effects of corporal punishment, few studies have examinedthe effects on executive-functioning ability. This new study uses a quasi-experimental design toderive data from a naturally occurring situation in which children were exposed to two differentdisciplinary environments. The parents of children in both schools endorsed physical punishmentequally, suggesting that the school environment can account for the differences found.

There are many further questions that remain unanswered. "We are now examining whetherbeing in a punitive environment day in and day out will have other negative impacts on children

such as lying or other covert antisocial behaviors. Also, we are pursuing the long termconsequences of experiencing corporal punishment. For example, what would children'scognitive and social development be 5 or 10 years down the road?," said Prof. Kang Lee.

The findings are relevant to current controversy. "In the U.S., 19 states still allow corporalpunishment in schools, although more of them are now asking for parent permission to use it.With this new evidence that the practice might actually undermine children's cognitive skillsneeded for self-control and learning, parents and policy makers can be better informed," saidProf. Stephanie M. Carlson.

Genes Play Greater Role in Heart AttacksThan Stroke, Researchers Say

ScienceDaily (July 27, 2011) People are significantly more likely to inherit a predisposition toheart attack than to stroke, according to research reported in Circulation: CardiovascularGenetics, an American Heart Association journal.

The study results have implications for better understanding the genetics of stroke and suggestthe need for separate risk assessment models for the two conditions.

"We found that the association between one of your parents having a heart attack and you havinga heart attack was a lot stronger than the association between your parent having a stroke andyou having a stroke," said senior author Peter M. Rothwell, M.D., Ph.D., professor of clinicalneurology at Oxford University in England. "That suggests the susceptibility to stroke is lessstrongly inherited than the susceptibility to heart attack."

A second analysis, which included patients' siblings as well as parents, yielded the same result:Family history proved a stronger risk predictor for heart attack than for stroke.


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Rothwell and his colleagues conducted the study to clarify and confirm evidence suggesting agreat difference in genetic predisposition between heart attacks and strokes. "We had foundpreviously that much of the heritability of stroke is related to the genetics of high blood pressure,which doesn't seem to be the case for heart attack," Rothwell said. Hypertension appears to beclosely related with stroke rather than heart attack, which is why a family history of hypertension

is related to a higher risk of stroke.

In the report just published, all patients were enrolled in the ongoing Oxford Vascular Study.OXVASC, as the study is known, that began in 2002 to study strokes, heart attacks and otheracute vascular events in a part of Oxfordshire County where more than 91,000people are servedby one hospital. Previous analyses in the same population conducted by lead author, AmitavaBanerjee MPH PhD, have shown the particular importance of family history in mother-daughtertransmission in both heart attacks and stroke. "Family history of heart attacks and family historyof strokes have rarely been studied in the same population," Banerjee said.

The researchers used data from 906 patients (604 men) with acute heart ailments and 1,015

patients (484 men)who suffered acute cerebral events. Among the study's findings:

In the heart patients, 30 percent had one parent who'd had a heart attack, 21 percent hadat least one sibling who had suffered a heart attack. Seven percent had two or moresiblings who had heart attacks and 5 percent had two parents with heart attack.

Among the patients with a stroke or transient ischemic attacks (TIAs, often called a mini-strokes or warning strokes), 21 percent had one parent who had a stroke, and 2 percenthad two parents with stroke. Eight percent had at least one sibling with a stroke and 1.4percent had at least two siblings with stroke.

The risk of a sibling developing acute heart problems was similar for those with heartattack or stroke.

The risk for an acute cardiac event was six times greater if both parents had suffered aheart attack and one-and-a-half times greater if one parent had a heart attack. In contrast,the likelihood of stroke did not change significantly with parents' stroke history.

The findings, if confirmed by additional studies, hold two significant implications, Rothwellsaid.

"First, the way physicians predict the odds of a healthy person suffering a heart attack or strokeneeds refining," he said. "Currently, most risk models lump a patient's family history of strokeand heart attack together. We probably should model family history of stroke and heart attackseparately in the future."

The new data also indicated that using the same criteria to predict both medical eventsoverestimate the risk of stroke, he added. "The knowledge of genetic factors in stroke lagsbehind that in coronary artery disease," Rothwell said. The discovery that genes play asignificantly smaller role in stroke could mean that genetic studies of stroke may not be criticalto the field, he added.


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Co-authors are Amitava Banerjee, MPH Ph.D.; Louise E. Silver, R.G.N., Ph.D.; Carl Heneghan,Ph.D.; Sarah J. V. Welch, R.G.N. MA; Ziyah Mehta, Ph.D.; and Adrian P. Banning, M.D.

Researchers Capture Breakthrough Data On

Cervical Spine InjuriesScienceDaily (July 26, 2011) A high school football player's broken neck -- from which he'srecovered -- has yielded breakthrough biomechanical data on cervical spine injuries that couldultimately affect safety and equipment standards for athletes.

University of New Hampshire associate professor of kinesiology Erik Swartz collaborated on thestudy, which appears in a letter in the New England Journal of Medicine.

Swartz and lead author Steven Broglio of the University of Michigan captured this

groundbreaking spinal fracture data while studying concussions. Broglio had fitted the helmetsof football players at a high school in the Midwest with padded sensors as part of the HeadImpact Telemetry System (HITS), which measures the location and magnitude of impacts to thehelmet. During a head-down tackle, an 18-year-old cornerback in the study suffered both aconcussion and a fracture of his cervical spine, or neck. (He has since fully recovered.)

"This is really novel," says Swartz, explaining that all previous research on cervical spineinjuries have been done on cadavers, animals, or via mathematical modeling. "You can't create acervical spine fracture in a healthy human, but here you have an actual event where we captureddata during an actual cervical spine injury," he says.

Swartz notes that this research will bring real-world information to the study of axial load impactto the head and its effects on the spine. "We now have data that we know caused a serious spineinjury in a healthy, 18-year-old strong-bodied athlete," he says.

Swartz, who teaches athletic training, was tapped by Broglio for his expertise in cervical spineinjuries in athletes. Swartz helped analyze the acceleration data from the in-helmet sensors incollaboration with sideline video footage of the tackle to describe the effects of the impact to theplayer.

The authors see far-reaching implications for this work in the quest for greater safety in youthsports. In the journal letter, they note that sports and recreation activities are the second most

common cause of cervical spine injuries for people under age 30, with an average lifetime cost ofmore than $3 million.

While concussions are far more common than broken necks among high school or collegeathletes, Broglio notes that media attention has been focused on professional sports. "To us, thelarger public health issue is with the 1.5 million high school kids that play football each year.Not the 1,500 that play in the NFL," he says.


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Swartz adds that this work will inform ongoing discussions about the safety and long-termeffects of head-down tackles. "It sends a huge message to the athletic community about head-down impact," he says.

Eliminating Protein in Specific Brain CellsBlocks Nicotine Reward

ScienceDaily (July 27, 2011) Removing a protein from cells located in the brain's rewardcenter blocks the anxiety-reducing and rewarding effects of nicotine, according to a new animalstudy in the July 27 issue ofThe Journal of Neuroscience. The findings may help researchersbetter understand how nicotine affects the brain.

Nicotine works by binding to proteins called nicotinic receptors on the surface of brain cells. Inthe new study, researchers led by Tresa McGranahan, Stephen Heinemann, PhD, and T. K.

Booker, PhD, of the Salk Institute for Biological Studies, found that removing a specific type ofnicotinic receptor from brain cells that produce dopamine -- a chemical released in response toreward -- makes mice less likely to seek out nicotine. The mice also did not show reductions inanxiety-like behaviors normally seen after nicotine treatment. Smokers commonly report anxietyrelief as a key factor in continued smoking or relapse.

"These findings show that the rewarding and anxiety-reducing properties of nicotine, thought toplay a key role in the development of tobacco addiction, are related to actions at a single set ofbrain cells," said Paul Kenny, PhD, an expert on drug addiction at Scripps Research Institute,who was unaffiliated with the study.

Previous studies showed blocking the alpha4 nicotinic receptor within the ventral tegmental area(VTA) -- a brain region important in motivation, emotion, and addiction -- decreases therewarding properties of nicotine. Because alpha4 receptors are present on several cell types inthe VTA, it was unclear how nicotine produced pleasurable feelings.

To zero in on the circuit important in the brain's response to nicotine, researchers developed micewith a mutation that left them unable to produce the alpha4 receptor, but only on dopamine braincells. Mice lacking alpha4 receptors in these cells spent less time looking to obtain nicotinecompared with normal mice, suggesting the alpha4 receptors are required for the rewardingeffects of nicotine. Nicotine also failed to reduce anxiety-like behaviors in the mutant mice, as itnormally does in healthy mice.

"Identification of the type of nicotinic receptors necessary for two key features of nicotineaddiction -- reward and anxiety -- may help us better understand the pathway that leads tonicotine dependence, and potential treatment for the one billion cigarette smokers worldwide,"McGranahan said. Diseases from tobacco use remain a major killer throughout the world,causing more than 5 million deaths per year.


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The findings could guide researchers to a better understanding of the mechanisms of tobaccoaddiction and assist in the development of new drugs to treat tobacco addiction and provide relieffrom anxiety disorders, Kenny added.

The research was supported by the National Institute of Neurological Disorders and Stroke, the

National Institute on Alcohol Abuse and Alcoholism, and the National Institute on Drug Abuse.

Short-Term Use of Amphetamines Can

Improve ADHD Symptoms in Adults, Review

Finds

ScienceDaily (July 28, 2011) Giving amphetamines to adults with Attention DeficitHyperactivity Disorder (ADHD) can help them control their symptoms, but the side effects mean

that some people do not manage to take them for very long. These conclusions were drawn by ateam of five researchers working at Girona and Barcelona Universities in Spain, and published ina new Cochrane Systematic Review.

Attention Deficit Hyperactivity Disorder (ADHD) is a childhood onset disorder, but half ofpeople with it find that the symptoms of hyperactivity, mood instability, irritability, difficulties inmaintaining attention, lack of organization and impulsive behaviours persist into adulthood. "Wewanted to see whether amphetamines could reverse the underlying neurological problems thatfeature in ADHD, and so improve ADHD symptoms," says Xavier Castells, who led the studyand works in the Unit of Clinical Pharmacology at University of Girona.

After searching through medical literature, they identified seven studies, which had enrolled atotal of 1091 participants in clinical trials. The three amphetamine based medicines theyconsidered (dextroamphetamine, lisdexamphetamine and mixed amphetamine salts (MAS)) allreduced ADHD symptoms, although there was no evidence that higher doses worked better thanlower ones.. The researchers did not find any difference between in effectiveness betweenformulations that release the amphetamines rapidly, and those that have a sustained-release.

While there was evidence that people taking amphetamines drop out of treatment due to adverseevents slightly more than those on placebo controls, the researchers were keen to point out thatonly 9% of people taking amphetamines withdrew from treatment. Looking at the differentformulations of amphetamines, those on MAS had lower drop-out rates than those on otherversions of the drug. Furthermore, most studies had a duration of between 2 and 7 weeks,therefore precluding the possibility of drawing conclusions regarding amphetamine's efficacyand safety in the long-term.

In many clinical trials, doctors randomly allocate some patients to 'treatment group' and givethem the active medication, while others are placed in a 'control group' and receive a placebo -- atreatment that looks and feels like the real thing, but has no active ingredient in it. The idea isthat the patient doesn't know which one they are on. This helps researchers determine how much


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of any apparent treatment effect is actually due to the therapy, and how much is due to otherfactors unrelated to drug effects such as the person believes regarding the efficacy of theintervention or the natural history of the disease. This experimental system only works, though,if the patients have no idea which group they are in. "One of the problems with trying to makesense of this research is that you cannot do a properly controlled study because the

amphetamines have such a distinct set of effects.. Patients instantly know whether they are on thetreatment or the placebo, so you have to be more cautious about the way you interpret the data,"says Castells.

"Given that other drugs, like atomoxetine or methylphenidate, have also been shown to reduceADHD symptoms in adults, it would be of great interest to compare the efficacy ofamphetamines to these interventions," says Castells

Gastric Bypass Surgery Changes Food

Preferences So That They Eat Less High FatFood

ScienceDaily (July 27, 2011) Gastric bypass surgery alters people's food preferences so thatthey eat less high fat food, according to a new study led by scientists at Imperial CollegeLondon. The findings, published in theAmerican Journal of Physiology -- Regulatory,Integrative, and Comparative Physiology, suggest a new mechanism by which some types ofbariatric surgery lead to long-term weight loss.

A growing number of obese patients are choosing to undergo bariatric surgery in order to lose

weight, with over 7,000 such procedures being carried out on the NHS in 2009-10. The mostcommon and the most effective procedure is the 'Roux-en-Y' gastric bypass, which involvesstapling the stomach to create a small pouch at the top, which is then connected directly to thesmall intestine, bypassing most of the stomach and the duodenum (the first part of the smallintestine). This means that patients feel full sooner.

The new study involved data from human trials as well as experiments using rats. Theresearchers used data from 16 participants in a study in which obese people were randomlyassigned either gastric bypass surgery or another type of operation, vertical-banded gastroplasty,in which the stomach volume is reduced but no part of the intestine is bypassed. The participantswho had had gastric bypass had a significantly smaller proportion of fat in their diet six yearsafter surgery, based on questionnaire responses.

In the rat experiments, rats given gastric bypass surgery were compared with rats that were givena sham operation. Rats that had gastric bypass surgery ate less food in total, but they specificallyate less high fat food and more low fat food. When given a choice between two bottles withdifferent concentrations of fat emulsions, the rats that had gastric bypass surgery showed a lowerpreference for high fat concentrations compared with rats that had a sham operation.


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"It seems that people who've undergone gastric bypass surgery are eating the right food withouteven trying," said Mr Torsten Olbers from Imperial College London, who performed theoperations on patients in the study at Sahlgrenska University Hospital in Gteborg, Sweden.

Dr Carel le Roux, from the Imperial Weight Centre at Imperial College London, who led the

research, said: "It appears that after bypass surgery, patients become hungry for good food andavoid junk food not because they have to, but because they just don't like it any more. If we canfind out why this happens, we might be able to help people to eat more healthily without mucheffort."

The rat experiments suggested that the reduced preference for high fat food was partly due to theeffects of digesting the food. There was no difference in preferences between gastric bypass ratsand sham-operated rats when the rats were only given access to the bottles for a few seconds,suggesting that bypass rats did not dislike the taste of high fat emulsions when they were onlyallowed small volumes at a time.

Rats can learn to avoid foods that they associate with illness, so the researchers tested whetherhigh fat foods would condition them to avoid certain tastes. They gave the rats saccharine-flavoured water while infusing corn oil into their stomachs. The gastric bypass rats learned toavoid saccharine, but the sham-operated rats did not, suggesting that the effect of digesting cornoil was unpleasant to the rats that had had gastric bypass surgery.

Levels of the satiety-promoting hormones GLP-1 and PYY were higher after feeding in thegastric bypass rats compared with sham-operated rats, suggesting a possible mechanism for thechanges in food preferences. The team at Imperial plan to study the role of these hormonesfurther to see if it might be possible to mimic the effects of gastric bypass without using surgery.

Unexpected Discovery On HormoneSecretion

ScienceDaily (July 27, 2011) A team of geneticists at the Institut de recherches cliniques deMontral (IRCM), directed by Dr. Jacques Drouin, made an unexpected discovery on hormonesecretion. Contrary to common belief, the researchers found that pituitary cells are organized instructured networks.

The scientific breakthrough was published July 26 by the scientific journal Proceedings of theNational Academy of Sciences (PNAS).

The pituitary gland, located at the base of the brain, secretes the hormones that preserve thebalance between all other glands of the endocrine system, which includes all hormone-producingorgans.


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"Each hormone in the pituitary gland is secreted by a specific type of cells," explains Dr. Drouin,Director of the Molecular Genetics research unit at the IRCM. "Until now, we believed that thesecells were randomly distributed throughout the pituitary gland."

By using three-dimensional imaging, the researchers discovered that the pituitary gland's

secreting cells are rather organized into highly-structured networks. Inside these networks, eachcell remains in contact with other cells of the same type, so as to form continuous sheets of cells.In fact, cells of the same lineage can recognize, exchange signals and even act in concert withone another.

"We were the first to reveal this three-dimensional organization," says Lionel Budry, graduatestudent in Dr. Drouin's laboratory and first co-author of the study. "In addition to discovering thecell's structure, we showed its importance for the development and function of the pituitarygland."

"We studied two networks of cells: cells that modulate our responses to stress, and cells that

control reproduction," adds Dr. Drouin. "Disturbing these networks could be associated withhormone deficiencies."

This research project was conducted in collaboration with the team of experts in three-dimensional imaging at the Universit de Montpellier directed by Dr. Patrice Mollard, whichincludes Chrystel Lafont, who is first co-author of the article with Lionel Budry.

Research carried out at the IRCM was funded by the Canadian Institutes of Health Research(CIHR) and the Canadian Cancer Society.

Could Patients' Own Kidney Cells CureKidney Disease? Reprogrammed Kidney

Cells Could Make Transplants and Dialysis

Things of the Past

ScienceDaily (July 27, 2011) Approximately 60 million people across the globe have chronickidney disease, and many will need dialysis or a transplant. Breakthrough research published intheJournal of the American Society Nephrology (JASN) indicates that patients' own kidney cellscan be gathered and reprogrammed. Reprogramming patients' kidney cells could mean that in thefuture, fewer patients with kidney disease would require complicated, expensive procedures thataffect their quality of life.

In the first study, Sharon Ricardo, PhD (Monash University, in Clayton, Australia) and hercolleagues took cells from an individual's kidney and coaxed them to become progenitor cells,allowing the immature cells to form any type in the kidney. Specifically, they inserted severalkey reprogramming genes into the renal cells that made them capable of forming other cells.


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In a second study, Miguel Esteban, MD, PhD (Chinese Academy of Sciences, in Guangzhou,China) and his colleagues found that kidney cells collected from a patient's urine can also bereprogrammed in this way. Using cells from urine allows a technology easy to implement in aclinic setting. Even better, the urine cells could be frozen and later thawed before they weremanipulated.

If researchers can expand the reprogrammed cells -- called induced pluripotent stem cells(iPSCs) -- and return them to the patient, these IPSCs may restore the health and vitality of thekidneys. In addition to providing a potentially curative therapy for patients, the breakthroughsmight also help investigators to study the causes of kidney disease and to screen new drugs thatcould be used to treat them.

In an accompanying editorial, Ian Rogers, PhD (Mount Sinai Hospital, in Toronto, Ontario,Canada) noted that "together, these two articles demonstrate the feasibility of using kidney cellsas a source of iPSCs, and efficient production of adult iPSCs from urine means that cells can becollected at any time."

Just as exciting, the ease of collection and high frequency of reprogramming described in thesearticles may help improve future therapies in many other areas of medicine.

Dr. Ricardo's co-authors include Bi Song, Jonathan Niclis, Maliha Alikhan, Samy Sakkal, AudeSylvain, Andrew Laslett, Claude Bernard (Monash University, in Clayton, Australia); and PeterKerr, (Monash Medical Centre, Australia, in Clayton, Australia).

Dr. Esteban's co-authors include Ting Zhou, Christina Benda, Yinghua Huang, Xingyan Li,Yanhua Li, Xiangpeng Guo, Guokun Cao, Shen Chen, Duanqing Pei (Chinese Academy ofSciences, in Guangzhou, China); Sarah Duzinger (University of Natural Resources and Life

Sciences); Lili Hao, Jiayan Wu (Chinese Academy of Sciences, Beijing, China); Yau-Chi Chan,Kwong-Man Ng, Jenny Cy Ho, Hung-Fat Tse (University of Hong Kong, Pokfulam, in HongKong, HKSAR, China); Matthias Wieser (University of Natural Resources and Life Sciences andAustrian Center for Industrial Biotechnology (ACIB), in Vienna, Austria); Heinz Redl (AustrianCluster for Tissue Regeneration, Vienna, Austria); and Johannes Grillari, Regina Grillari-Voglauer ( University of Natural Resources and Life Sciences and Evercyte GmbH, in Vienna,Austria).

How Memory Is Lost: Loss of Memory Due

to Aging May Be ReversibleScienceDaily (July 28, 2011) Yale University researchers can't tell you where you left yourcar keys -- but they can tell you why you can't find them.


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The neural networks in the brains of the middle-aged and elderly have weaker connections and

fire less robustly than in youthful ones. (Credit: Image courtesy of Yale University)

A new study published July 27 in the journal Nature shows the neural networks in the brains ofthe middle-aged and elderly have weaker connections and fire less robustly than in youthful

ones. Intriguingly, the research suggests that this condition is reversible.

"Age-related cognitive deficits can have a serious impact on our lives in the Information Age aspeople often need higher cognitive functions to meet even basic needs, such as paying bills oraccessing medical care," said Amy Arnsten, Professor of Neurobiology and Psychology and amember of the Kavli Institute for Neuroscience. "These abilities are critical for maintainingdemanding careers and being able to live independently as we grow older."

As people age, they tend to forget things more often, are more easily distracted and disrupted byinterference, and have greater difficulty with executive functions. While these age-relateddeficits have been known for many years, the cellular basis for these common cognitive

difficulties has not been understood. The new study examined for the first time age-relatedchanges in the activity of neurons in the prefrontal cortex (PFC), the area of the brain that isresponsible for higher cognitive and executive functions.

Networks of neurons in the prefrontal cortex generate persistent firing to keep information "inmind" even in the absence of cues from the environment. This process is called "workingmemory," and it allows us to recall information, such as where the car keys were left, even whenthat information must be constantly updated. This ability is the basis for abstract thought andreasoning, and is often called the "Mental Sketch Pad." It is also essential for executivefunctions, such as multi-tasking, organizing, and inhibiting inappropriate thoughts and actions.

Arnsten and her team studied the firing of prefrontal cortical neurons in young, middle-aged andaged animals as they performed a working memory task. Neurons in the prefrontal cortex of theyoung animals were able to maintain firing at a high rate during working memory, while neuronsin older animals showed slower firing rates. However, when the researchers adjusted theneurochemical environment around the neurons to be more similar to that of a younger subject,the neuronal firing rates were restored to more youthful levels.


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Arnsten said that the aging prefrontal cortex appears to accumulate excessive levels of asignaling molecule called cAMP, which can open ion channels and weaken prefrontal neuronalfiring. Agents that either inhibited cAMP or blocked cAMP-sensitive ion channels were able torestore more youthful firing patterns in the aged neurons. One of the compounds that enhancedneuronal firing was guanfacine, a medication that is already approved for treating hypertension

in adults, and prefrontal deficits in children, suggesting that it may be helpful in the elderly aswell.

Arnsten's finding is already moving to the clinical setting. Yale is enrolling subjects in a clinicaltrial testing guanfacine's ability to improve working memory and executive functions in elderlysubjects who do not have Alzheimer's Disease or other dementias.

Social Deficits Associated With Autism,

Schizophrenia Induced in Mice With New

TechnologyScienceDaily (July 27, 2011) Researchers at Stanford University School of Medicine havebeen able to switch on, and then switch off, social-behavior deficits in mice that resemble thoseseen in people with autism and schizophrenia, thanks to a technology that allows scientists toprecisely manipulate nerve activity in the brain. In synchrony with this experimentally inducedsocially aberrant behavior, the mice exhibited a brain-wave pattern called gamma oscillation thathas been associated with autism and schizophrenia in humans, the researchers say.

The findings, to be published online inNature on July 27, lend credence to a hypothesis that has

been long floated but hard to test, until now. They mark the first demonstration, the researcherssaid, that elevating the brain's susceptibility to stimulation can produce social deficits resemblingthose of autism and schizophrenia, and that then restoring the balance eases those symptoms.

Autism spectrum disorder and schizophrenia each affect nearly 1 percent of all people. Atpresent, there are no good drugs for mitigating the social-behavioral deficits of either disorder.While they differ in many ways, each syndrome is extremely complex, involving diverse deficitsincluding social dysfunction. Mice are social animals, and there are many well-established testsof sociability in these animals.

Social behavior can't be ascribed to a single brain region, said Karl Deisseroth, MD, PhD,associate professor of psychiatry and behavioral sciences and of bioengineering and the study'ssenior author. "To form a coherent pattern of another individual, you need to quickly integrate allkinds of sensations. And that's just the tip of the iceberg," said Deisseroth, a practicingpsychiatrist who routinely sees autistic-spectrum patients. "It's all changing, millisecond bymillisecond, as both you and the other individual act and react. You have to constantly alter yourown predictions about what's coming next. This kind of interaction is immensely more uncertainthan, for example, predator/prey activity. It seems that it has to involve the whole brain, not justone or another part of it."


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One intriguing hypothesis holds that social dysfunctions characteristic of autism andschizophrenia may stem from an altered balance in the propensity of excitatory versus inhibitorynerve cells in the brain to fire, resulting in an overall hyper-responsiveness to stimulation.Evidence for this hypothesis includes the higher seizure rate among patients with autism, and thefact that many autistic children's brains exhibit elevated levels of a high-frequency brain-wave

pattern -- known as "gamma oscillation" -- that can be picked up by an electroencephalogram.Many schizophrenics also exhibit social deficits as well as higher levels of this anomalous brain-wave pattern, even at rest.

In addition, said Deisseroth, "autistic kids seem to be over-responding to environmental stimuli."For instance, they find eye contact overwhelming, or may cover their ears if there are too manypeople talking at once.

There has been no direct way to test the "excitation/inhibition-balance" hypothesis, Deisserothsaid. It's been impossible to experimentally shift the balance between excitation and inhibition inthe brain by selectively raising the firing propensities of one class of nerve cells but not the

opposing class, because there have been no drugs or electrophysiological methods that act onlyon excitatory cells of the brain, or only on inhibitory cells.

But Deisseroth's team has a way of doing that, with a new technology, pioneered in hislaboratory and called optogenetics: selectively bioengineering specific types of nerve cells sothat they respond to light. These cells can be bioengineered to be either more or less likely --depending on the researchers' intent -- to relay an impulse to the next nerve cell in a circuit. Sowith the flick of a switch, the scientists can activate a nerve circuit in the brain or inhibit it.Nerve cells can also be rendered responsive, in various ways, to different frequencies of light,allowing several circuits to be manipulated at once. (The optogenetic technique cannot be used inhumans at this time as it requires still-experimental genetic modifications to brain cells.)

For the experiments in this study, the investigators targeted excitatory and inhibitory nerve cellsin the medial prefrontal cortex, the most advanced part of the mouse brain, Deisseroth said. Thisregion is very well-connected to everyplace else in the brain and is involved in processes such asplanning, execution, personality and social behavior, he said.

"We didn't want to precisely direct the firing patterns of excitatory or inhibitory cells,"Deisseroth said. "We wouldn't know where to start, because we don't know the neural codes ofbehavior. We just wanted to bias excitability."

Instead, the researchers bioengineered the nerve cells to respond to specific wavelength bands oflight by becoming, for extended periods of time, either more or less likely to fire. "Nerve cellshave an all-or-nothing tipping point," Deisseroth said. "Up to that point, they won't do much. Butat a certain threshold, they fire."

The study's two first co-authors, postdoctoral researcher Ofer Yizhar, PhD, (now at WeizmannInstitute of Science in Rehovot, Israel), and Lief Fenno, a graduate student in the medicalschool's MD/PhD program, devised ways of activating or inhibiting brain circuits by a light pulsefor up to a half-hour, variously increasing or decreasing the firing propensity of nerve cells in


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those circuits. This time period was long enough to let the animals engage in various tests ofsocial behavior.

The researchers subjected the mice they'd bioengineered to standard assays of rodent behavior,and compared the results to outcomes using normal mice.

The experimental mice exhibited no difference from the normal mice in tests of their anxietylevels, their tendency to move around or their curiosity about new objects. But, the teamobserved, the animals in whose medial prefrontal cortex excitability had been optogeneticallystimulated lost virtually all interest in engaging with other mice to whom they were exposed.(The normal mice were much more curious about one another.)

"Boosting their excitatory nerve cells largely abolished their social behavior," Deisseroth said. Inaddition, these mice's brains showed the same gamma-oscillation pattern that is observed amongmany autistic and schizophrenic patients. "When you raise the firing likelihood of excitatorycells in the medial prefrontal cortex, you see an increased gamma oscillation right away, just as

one would predict it would if this change in the excitatory/inhibitory balance were in factrelevant."

And when the scientists restored that balance by revving up inhibitory nerve-cell firing in themedial prefrontal cortex, they saw a moderate but significant recovery of social function.

"The behavioral results and the correspondence of gamma-oscillation changes to alterations inthe animals' excitatory/inhibitory balance suggest that that what we're observing in animals couldbe relevant to people," said Deisseroth.

The study was performed in collaboration with experimental biophysics professor Peter

Hegemann, PhD, and his colleagues at Humboldt University in Berlin, and John Huguenard,PhD, professor of neurology and neurological sciences at Stanford. Additional Stanford co-authors were bioengineering postdoctoral researchers Thomas Davidson, PhD, Vikaas Sohal,PhD and Inbal Goshen, PhD; neurology postdoctoral researcher Jeanne Paz, PhD; neurosciencegraduate student Daniel O'Shea; bioengineering research associate Joel Finkelstein; andbioengineering laboratory manager Charu Ramakrishnan. Funding came from the Yu, Woo,Snyder and Keck foundations, and from the National Institute of Mental Health, NationalInstitute on Drug Abuse, National Institute of Neurological Disorders and Stroke, the DARPAREPAIR program and the California Institute for Regenerative Medicine, as well as the CNCprogram at Stanford.

Yoga Boosts Stress-Busting Hormone,Reduces Pain, Study Finds

ScienceDaily (July 27, 2011) A new study by York University researchers finds thatpracticing yoga reduces the physical and psychological symptoms of chronic pain in women withfibromyalgia.


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The study is the first to look at the effects of yoga on cortisol levels in women with fibromyalgia.The condition, which predominantly affects women, is characterized by chronic pain and fatigue;common symptoms include muscle stiffness, sleep disturbances, gastrointestinal discomfort,anxiety and depression.

Previous research has found that women with fibromyalgia have lower-than-average cortisollevels, which contribute to pain, fatigue and stress sensitivity. According to the study,participants' saliva revealed elevated levels of total cortisol following a program of 75 minutes ofhatha yoga twice weekly over the course of eight weeks.

"Ideally, our cortisol levels peak about 30-40 minutes after we get up in the morning and declinethroughout the day until we're ready to go to sleep," says the study's lead author, Kathryn Curtis,a PhD student in York's Department of Psychology, Faculty of Health. "The secretion of thehormone, cortisol, is dysregulated in women with fibromyalgia" she says.

Cortisol is a steroid hormone that is produced and released by the adrenal gland and functions as

a component of the hypothalamic-pituitary-adrenal (HPA) axis in response to stress.

"Hatha yoga promotes physical relaxation by decreasing activity of the sympathetic nervoussystem, which lowers heart rate and increases breath volume. We believe this in turn has apositive effect on the HPA axis," says Curtis.

Participants completed questionnaires to determine pain intensity pre- and post-study; theyreported significant reductions in pain and associated symptoms, as well as psychologicalbenefits. They felt less helpless, were more accepting of their condition, and were less likely to"catastrophize" over current or future symptoms.

"We saw their levels of mindfulness increase -- they were better able to detach from theirpsychological experience of pain," Curtis says. Mindfulness is a form of active mental awarenessrooted in Buddhist traditions; it is achieved by paying total attention to the present moment witha non-judgmental awareness of inner and outer experiences.

"Yoga promotes this concept -- that we are not our bodies, our experiences, or our pain. This isextremely useful in the management of pain," she says. "Moreover, our findings strongly suggestthat psychological changes in turn affect our experience of physical pain."

The study -- Curtis' thesis -- was published July 26 in theJournal of Pain Research. It is co-authored by her supervisor, York professor Joel Katz, Canada Research Chair in Health

Psychology, and Anna Osadchuk, a York University undergraduate student.

Curtis was supported by a Canadian Institutes of Health Research (CIHR) Canada GraduateScholarship and a CIHR Strategic Training Grant Fellowship in Pain: Molecules to Community.


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How Memory Is Lost: Loss of Memory Due

to Aging May Be Reversible

ScienceDaily (July 28, 2011)

Yale University researchers can't tell you where you left yourcar keys -- but they can tell you why you can't find them.

A new study published July 27 in the journal Nature shows the neural networks in the brains ofthe middle-aged and elderly have weaker connections and fire less robustly than in youthfulones. Intriguingly, the research suggests that this condition is reversible.

"Age-related cognitive deficits can have a serious impact on our lives in the Information Age aspeople often need higher cognitive functions to meet even basic needs, such as paying bills oraccessing medical care," said Amy Arnsten, Professor of Neurobiology and Psychology and amember of the Kavli Institute for Neuroscience. "These abilities are critical for maintaining

demanding careers and being able to live independently as we grow older."

As people age, they tend to forget things more often, are more easily distracted and disrupted byinterference, and have greater difficulty with executive functions. While these age-relateddeficits have been known for many years, the cellular basis for these common cognitivedifficulties has not been understood. The new study examined for the first time age-relatedchanges in the activity of neurons in the prefrontal cortex (PFC), the area of the brain that isresponsible for higher cognitive and executive functions.

Networks of neurons in the prefrontal cortex generate persistent firing to keep information "inmind" even in the absence of cues from the environment. This process is called "working

memory," and it allows us to recall information, such as where the car keys were left, even whenthat information must be constantly updated. This ability is the basis for abstract thought andreasoning, and is often called the "Mental Sketch Pad." It is also essential for executivefunctions, such as multi-tasking, organizing, and inhibiting inappropriate thoughts and actions.

Arnsten and her team studied the firing of prefrontal cortical neurons in young, middle-aged andaged animals as they performed a working memory task. Neurons in the prefrontal cortex of theyoung animals were able to maintain firing at a high rate during working memory, while neuronsin older animals showed slower firing rates. However, when the researchers adjusted theneurochemical environment around the neurons to be more similar to that of a younger subject,the neuronal firing rates were restored to more youthful levels.

Arnsten said that the aging prefrontal cortex appears to accumulate excessive levels of asignaling molecule called cAMP, which can open ion channels and weaken prefrontal neuronalfiring. Agents that either inhibited cAMP or blocked cAMP-sensitive ion channels were able torestore more youthful firing patterns in the aged neurons. One of the compounds that enhancedneuronal firing was guanfacine, a medication that is already approved for treating hypertensionin adults, and prefrontal deficits in children, suggesting that it may be helpful in the elderly aswell.


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Arnsten's finding is already moving to the clinical setting. Yale is enrolling subjects in a clinicaltrial testing guanfacine's ability to improve working memory and executive functions in elderlysubjects who do not have Alzheimer's Disease or other dementias.

Social Deficits Associated With Autism,Schizophrenia Induced in Mice With New

Technology

ScienceDaily (July 27, 2011) Researchers at Stanford University School of Medicine havebeen able to switch on, and then switch off, social-behavior deficits in mice that resemble thoseseen in people with autism and schizophrenia, thanks to a technology that allows scientists toprecisely manipulate nerve activity in the brain. In synchrony with this experimentally inducedsocially aberrant behavior, the mice exhibited a brain-wave pattern called gamma oscillation that

has been associated with autism and schizophrenia in humans, the researchers say.

The findings, to be published online inNature on July 27, lend credence to a hypothesis that hasbeen long floated but hard to test, until now. They mark the first demonstration, the researcherssaid, that elevating the brain's susceptibility to stimulation can produce social deficits resemblingthose of autism and schizophrenia, and that then restoring the balance eases those symptoms.

Autism spectrum disorder and schizophrenia each affect nearly 1 percent of all people. Atpresent, there are no good drugs for mitigating the social-behavioral deficits of either disorder.While they differ in many ways, each syndrome is extremely complex, involving diverse deficitsincluding social dysfunction. Mice are social animals, and there are many well-established tests

of sociability in these animals.

Social behavior can't be ascribed to a single brain region, said Karl Deisseroth, MD, PhD,associate professor of psychiatry and behavioral sciences and of bioengineering and the study'ssenior author. "To form a coherent pattern of another individual, you need to quickly integrate allkinds of sensations. And that's just the tip of the iceberg," said Deisseroth, a practicingpsychiatrist who routinely sees autistic-spectrum patients. "It's all changing, millisecond bymillisecond, as both you and the other individual act and react. You have to constantly alter yourown predictions about what's coming next. This kind of interaction is immensely more uncertainthan, for example, predator/prey activity. It seems that it has to involve the whole brain, not justone or another part of it."

One intriguing hypothesis holds that social dysfunctions characteristic of autism andschizophrenia may stem from an altered balance in the propensity of excitatory versus inhibitorynerve cells in the brain to fire, resulting in an overall hyper-responsiveness to stimulation.Evidence for this hypothesis includes the higher seizure rate among patients with autism, and thefact that many autistic children's brains exhibit elevated levels of a high-frequency brain-wavepattern -- known as "gamma oscillation" -- that can be picked up by an electroencephalogram.


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Many schizophrenics also exhibit social deficits as well as higher levels of this anomalous brain-wave pattern, even at rest.

In addition, said Deisseroth, "autistic kids seem to be over-responding to environmental stimuli."For instance, they find eye contact overwhelming, or may cover their ears if there are too many

people talking at once.

There has been no direct way to test the "excitation/inhibition-balance" hypothesis, Deisserothsaid. It's been impossible to experimentally shift the balance between excitation and inhibition inthe brain by selectively raising the firing propensities of one class of nerve cells but not theopposing class, because there have been no drugs or electrophysiological methods that act onlyon excitatory cells of the brain, or only on inhibitory cells.

But Deisseroth's team has a way of doing that, with a new technology, pioneered in hislaboratory and called optogenetics: selectively bioengineering specific types of nerve cells sothat they respond to light. These cells can be bioengineered to be either more or less likely --

depending on the researchers' intent -- to relay an impulse to the next nerve cell in a circuit. Sowith the flick of a switch, the scientists can activate a nerve circuit in the brain or inhibit it.Nerve cells can also be rendered responsive, in various ways, to different frequencies of light,allowing several circuits to be manipulated at once. (The optogenetic technique cannot be used inhumans at this time as it requires still-experimental genetic modifications to brain cells.)



Instead, the researchers bioengineered the nerve cells to respond to specific wavelength bands oflight by becoming, for extended periods of time, either more or less likely to fire. "Nerve cellshave an all-or-nothing tipping point," Deisseroth said. "Up to that point, they won't do much. Butat a certain threshold, they fire."

The study's two first co-authors, postdoctoral researcher Ofer Yizhar, PhD, (now at WeizmannInstitute of Science in Rehovot, Israel), and Lief Fenno, a graduate student in the medicalschool's MD/PhD program, devised ways of activating or inhibiting brain circuits by a light pulsefor up to a half-hour, variously increasing or decreasing the firing propensity of nerve cells inthose circuits. This time period was long enough to let the animals engage in various tests ofsocial behavior.



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The experimental mice exhibited no difference from the normal mice in tests of their anxietylevels, their tendency to move around or their curiosity about new objects. But, the teamobserved, the animals in whose medial prefrontal cortex excitability had been optogeneticallystimulated lost virtually all interest in engaging with other mice to whom they were exposed.(The normal mice were much more curious about one another.)

"Boosting their excitatory nerve cells largely abolished their social behavior," Deisseroth said. Inaddition, these mice's brains showed the same gamma-oscillation pattern that is observed amongmany autistic and schizophrenic patients. "When you raise the firing likelihood of excitatorycells in the medial prefrontal cortex, you see an increased gamma oscillation right away, just asone would predict it would if this change in the excitatory/inhibitory balance were in factrelevant."

And when the scientists restored that balance by revving up inhibitory nerve-cell firing in themedial prefrontal cortex, they saw a moderate but significant recovery of social function.


The study was performed in collaboration with experimental biophysics professor PeterHegemann, PhD, and his colleagues at Humboldt University in Berlin, and John Huguenard,PhD, professor of neurology and neurological sciences at Stanford. Additional Stanford co-authors were bioengineering postdoctoral researchers Thomas Davidson, PhD, Vikaas Sohal,PhD and Inbal Goshen, PhD; neurology postdoctoral researcher Jeanne Paz, PhD; neurosciencegraduate student Daniel O'Shea; bioengineering research associate Joel Finkelstein; andbioengineering laboratory manager Charu Ramakrishnan. Funding came from the Yu, Woo,

Snyder and Keck foundations, and from the National Institute of Mental Health, NationalInstitute on Drug Abuse, National Institute of Neurological Disorders and Stroke, the DARPAREPAIR program and the California Institute for Regenerative Medicine, as well as the CNCprogram at Stanford.

The findings, to be published online inNature on July 27, lend credence to a hypothesis that hasbeen long floated but hard to test, until now. They mark the first demonstration, the researcherssaid, that elevating the brain's susceptibility to stimulation can produce social deficits resemblingthose of autism and schizophrenia, and that then restoring the balance eases those symptoms.

Autism spectrum disorder and schizophrenia each affect nearly 1 percent of all people. Atpresent, there are no good drugs for mitigating the social-behavioral deficits of either disorder.While they differ in many ways, each syndrome is extremely complex, involving diverse deficitsincluding social dysfunction. Mice are social animals, and there are many well-established testsof sociability in these animals.

Social behavior can't be ascribed to a single brain region, said Karl Deisseroth, MD, PhD,associate professor of psychiatry and behavioral sciences and of bioengineering and the study'ssenior author. "To form a coherent pattern of another individual, you need to quickly integrate all


22/27

kinds of sensations. And that's just the tip of the iceberg," said Deisseroth, a practicingpsychiatrist who routinely sees autistic-spectrum patients. "It's all changing, millisecond bymillisecond, as both you and the other individual act and react. You have to constantly alter yourown predictions about what's coming next. This kind of interaction is immensely more uncertainthan, for example, predator/prey activity. It seems that it has to involve the whole brain, not just

one or another part of it."

One intriguing hypothesis holds that social dysfunctions characteristic of autism andschizophrenia may stem from an altered balance in the propensity of excitatory versus inhibitorynerve cells in the brain to fire, resulting in an overall hyper-responsiveness to stimulation.Evidence for this hypothesis includes the higher seizure rate among patients with autism, and thefact that many autistic children's brains exhibit elevated levels of a high-frequency brain-wavepattern -- known as "gamma oscillation" -- that can be picked up by an electroencephalogram.Many schizophrenics also exhibit social deficits as well as higher levels of this anomalous brain-wave pattern, even at rest.

In addition, said Deisseroth, "autistic kids seem to be over-responding to environmental stimuli."For instance, they find eye contact overwhelming, or may cover their ears if there are too manypeople talking at once.

There has been no direct way to test the "excitation/inhibition-balance" hypothesis, Deisserothsaid. It's been impossible to experimentally shift the balance between excitation and inhibition inthe brain by selectively raising the firing propensities of one class of nerve cells but not theopposing class, because there have been no drugs or electrophysiological methods that act onlyon excitatory cells of the brain, or only on inhibitory cells.

But Deisseroth's team has a way of doing that, with a new technology, pioneered in his

laboratory and called optogenetics: selectively bioengineering specific types of nerve cells sothat they respond to light. These cells can be bioengineered to be either more or less likely --depending on the researchers' intent -- to relay an impulse to the next nerve cell in a circuit. Sowith the flick of a switch, the scientists can activate a nerve circuit in the brain or inhibit it.Nerve cells can also be rendered responsive, in various ways, to different frequencies of light,allowing several circuits to be manipulated at once. (The optogenetic technique cannot be used inhumans at this time as it requires still-experimental genetic modifications to brain cells.)



Instead, the researchers bioengineered the nerve cells to respond to specific wavelength bands oflight by becoming, for extended periods of time, either more or less likely to fire. "Nerve cells


23/27

have an all-or-nothing tipping point," Deisseroth said. "Up to that point, they won't do much. Butat a certain threshold, they fire."

The study's two first co-authors, postdoctoral researcher Ofer Yizhar, PhD, (now at WeizmannInstitute of Science in Rehovot, Israel), and Lief Fenno, a graduate student in the medical

school's MD/PhD program, devised ways of activating or inhibiting brain circuits by a light pulsefor up to a half-hour, variously increasing or decreasing the firing propensity of nerve cells inthose circuits. This time period was long enough to let the animals engage in various tests ofsocial behavior.


The experimental mice exhibited no difference from the normal mice in tests of their anxietylevels, their tendency to move around or their curiosity about new objects. But, the teamobserved, the animals in whose medial prefrontal cortex excitability had been optogenetically

stimulated lost virtually all interest in engaging with other mice to whom they were exposed.(The normal mice were much more curious about one another.)

"Boosting their excitatory nerve cells largely abolished their social behavior," Deisseroth said. Inaddition, these mice's brains showed the same gamma-oscillation pattern that is observed amongmany autistic and schizophrenic patients. "When you raise the firing likelihood of excitatorycells in the medial prefrontal cortex, you see an increased gamma oscillation right away, just asone would predict it would if this change in the excitatory/inhibitory balance were in factrelevant."

And when the scientists restored that balance by revving up inhibitory nerve-cell firing in the

medial prefrontal cortex, they saw a moderate but significant recovery of social function.


The study was performed in collaboration with experimental biophysics professor PeterHegemann, PhD, and his colleagues at Humboldt University in Berlin, and John Huguenard,PhD, professor of neurology and neurological sciences at Stanford. Additional Stanford co-authors were bioengineering postdoctoral researchers Thomas Davidson, PhD, Vikaas Sohal,PhD and Inbal Goshen, PhD; neurology postdoctoral researcher Jeanne Paz, PhD; neurosciencegraduate student Daniel O'Shea; bioengineering research associate Joel Finkelstein; andbioengineering laboratory manager Charu Ramakrishnan. Funding came from the Yu, Woo,Snyder and Keck foundations, and from the National Institute of Mental Health, NationalInstitute on Drug Abuse, National Institute of Neurological Disorders and Stroke, the DARPAREPAIR program and the California Institute for Regenerative Medicine, as well as the CNCprogram at Stanford.


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The First True View of Global Erosion

ScienceDaily (July 27, 2011) Every mountain and hill shall be made low, declared the ancientprophet Isaiah. In other words: erosion happens. But for the modern geologist a vexing question

remains: how fast does this erosion happen?

For more than a century, scientists have looked for ways to measure and compare erosion ratesacross differing landscapes around the globe -- but with limited success.

"Knowing the background rate of erosion for a place is extremely important," says University ofVermont geologist Paul Bierman, "if you want to compare it to what's coming off the landscapetoday because of human impacts like agriculture, development, and forestry."

Since the mid-1980's, measurements of a rare radioactive element -- beryllium-10 that appears inquartz bombarded by cosmic rays in the top few feet of Earth's surface -- have greatly improved

geologists' ability to estimate erosion rates. But these experiments have been done on a local orregional scale, using a variety of methods, calculation constants, and corrections. Comparisonsbetween climate zones and differing rock types have been difficult -- cutting off a globalperspective.

Now Bierman and his graduate student, Eric Portenga, have taken twenty years worth of thisdisparate data, compiled 1599 measurements from eighty-seven sites around the world, andrecalculated it with a single, up-to-date method.

Their work, "provides the first broad, standardized view of pre-human, geologic erosion rates,"they write in "Understanding Earth's eroding surface with 10Be," published in the August edition

ofGSA Today, an open-access journal, available online July 26, 2011.

Sustainable Soil

"Nobody has stepped back far enough to look at this big picture," says Bierman, "we all work onour little postage stamps of the world -- Africa, South America, the western US." But many ofthe pressing questions about erosion are global in scale.

Most urgent, the ability to support the nine billion people forecast to be living on Earth by mid-century rests directly on the resiliency of soil systems and the health of water supplies. And thesetwo pillars of sustainability are directly and deeply affected by erosion.

The method used in this new study can provide a good tool for measuring the sustainability ofmodern agricultural practices, Bierman notes, since the beryllium-10 data shows the rate atwhich landscapes have been changing in the recent geologic past: the last thousand to several-hundred-thousand years. "If human impacts result in rates faster than we measure, it's non-sustainable," he says.


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Portenga sees how this study can help managers in contested landscapes like the ChesapeakeBay. "Regulators may want to stipulate an ideal amount of sediment coming out of a river systemand they may say that they want to get this back to 'normal' standards or 'normal rate.' But whatis that rate? What was the erosion like before people started interacting with the landscape?" hesays.

Not being able to answer that question well has contributed to many regulatory conflicts. "Thiswork can help give a better idea of what is normal," says Portenga, who was the lead author onthe study.

No Smoking Gun

This new study also goes fairly far in identifying the environmental factors -- including latitude,annual precipitation, and, especially, slope -- that drive erosion rates in drainage basins. Themechanisms controlling erosion on outcrops of bedrock are less clear.

Using several statistical tests, Portenga and Bierman were able to explain about sixty percent ofwhat controls differing erosion rates in drainage basins around the world. But their study onlyexplains about thirty percent of the variability between outcrops of bedrock. "This meansgeologists are missing a lot of the crucial information about what is controlling bedrock erosion,"Portenga says.

Little-studied variables -- like the density of fractures in bedrock, the strength of rocks, and theirchemistry -- may be controlling erosion rates, the study suggests.

"I don't think we'll ever find the single smoking gun of erosion," says Portenga, "the naturalworld is so complex and there are so many factors that contribute to how landscapes change over

time. But as this method develops, we will have a better sense of what variables are important --and which are not -- in this erosion story."

For example, it has been a truism of geology for decades that rainfall is the biggest driver oferosion. Semi-arid landscapes with little vegetation and occasional major storms wereunderstood to have the greatest rates of erosion. But this study challenges that idea. "It turns outthat the greatest control on erosion is not mean annual precipitation," says Bierman. Instead, lookat slope.

"People had always thought slope was important," Beirman says, "but these data show that slopeis really important."

Modeling the Future

Their new study, supported by the National Science Foundation, is part of a larger long-termgoal of creating a global model that can predict the background rate and patterns of erosionacross the whole planet -- and how these erosion rates will respond to changes like human-induced climate change.


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"Following this study, we can start to answer big questions like, 'how does climate driveerosion?'" says Bierman. In other words, a clearer picture of what global erosion has looked likein the recent past will start to illuminate what is likely to happen in the future as human impactsand land-use decisions play out.

"We want a predictive model," says Bierman, "we want to be able to have somebody say, 'here'smy drainage basin, here's the climate, here's the rock type, here's the slope, here's the meanannual precipitation: how quickly is this eroding?' That's what you need for land management."

Newly Developed Fluorescent Protein Makes

Internal Organs Visible

ScienceDaily (July 26, 2011) Researchers at Albert Einstein College of Medicine of YeshivaUniversity have developed the first fluorescent protein that enables scientists to clearly "see" the

internal organs of living animals without the need for a scalpel or imaging techniques that canhave side effects or increase radiation exposure.

The new probe could prove to be a breakthrough in whole-body imaging -- allowing doctors, forexample, to noninvasively monitor the growth of tumors in order to assess the effectiveness ofanti-cancer therapies. In contrast to other body-scanning techniques, fluorescent-protein imagingdoes not involve radiation exposure or require the use of contrast agents. The findings aredescribed in the July 17 online edition ofNature Biotechnology.

For the past 20 years, scientists have used a variety of colored fluorescent proteins, derived fromjellyfish and corals, to visualize cells and their organelles and molecules. But using fluorescent

probes to peer inside live mammals has posed a major challenge. The reason: hemoglobin in ananimal's blood effectively absorbs the blue, green, red and other wavelengths used to stimulatestandard fluorescent proteins along with any wavelengths emitted by the proteins when they dolight up.

To overcome that roadblock, the laboratory of Vladislav Verkhusha, Ph.D., associate professorof anatomy and structural biology at Einstein and the study's senior author, engineered afluorescent protein from a bacterial phytochrome (the pigment that a species of bacteria uses todetect light). This new phytochrome-based fluorescent protein, dubbed iRFP, both absorbs andemits light in the near-infrared portion of the electromagnetic spectrum- the spectral region inwhich mammalian tissues are nearly transparent.

The researchers targeted their fluorescent protein to the liver -- an organ particularly difficult tovisualize because of its high blood content. Adenovirus particles containing the gene for iRFPwere injected into mice. Once the viruses and their gene cargoes infected liver cells, the infectedcells expressed the gene and produced iRFP protein. The mice were then exposed to near-infrared light and it was possible to visualize the resulting emitted fluorescent light using awhole-body imaging device. Fluorescence of the liver in the infected mice was first detected the


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second day after infection and reached a peak at day five. Additional experiments showed thatthe iRFP fluorescent protein was nontoxic.

"Our study found that iRFP was far superior to the other fluorescent proteins that reportedly helpin visualizing the livers of live animals," said Grigory Filonov, Ph.D., a postdoctoral fellow in

Dr. Verkhusha''''s laboratory at Einstein, and the first author of theNature Biotechnology paper."iRFP not only produced a far brighter image, with higher contrast than the other fluorescentproteins, but was also very stable over time. We believe it will significantly broaden the potentialuses for noninvasive whole-body imaging."

Dr. Filonov noted that fluorescent-protein imaging involves no radiation risk, which can occurwith standard x-rays and computed tomography (CT) scanning. And unlike magnetic resonanceimaging (MRI), in which contrasting agents must sometimes be swallowed or injected to makeinternal body structures more visible, the contrast provided by iRFP is so vibrant that contrastingagents are not needed.

new cancer treatment2

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