martin pera stem cells and the future of medicine
TRANSCRIPT
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Stem Cells and the Future of Medicine
Martin PeraEli and Edythe Broad
Center for Regenerative MedicineAnd Stem Cell Research at USC
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What is regenerative medicine?
An emerging field of therapeutics that has as its goal the restoration of normal function in conditions characterised by cell loss, caused by disease or injury. Restoration may involve the administration of cells to replace damaged tissue, alone or in combination with synthetic scaffolds, or the administration of pharmaceuticals that help drive the patient’s tissue to repair itself.
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What is a stem cell?
• A primitive cell with two key properties:• Self renewal, or the ability to divide many times to produce
more stem cells• The ability to undergo differentiation or specialisation to give
rise to mature functional cells• Stem cells have the potential to replace dead or damaged
cells in diseased tissue
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Tissue Stem Cells
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Clinical uses of tissue stem cells
• Bone marrow and cord blood-hematopoietic disorders, leukemias
• Mesenchymal stem cells-cartilage repair• Neural stem cells-early phase trials
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Limitations with tissue stem cells
• Rare-minority population in most tissues ie less that 1/1000
• Usually have a limited repertoire-can only give rise to a few types of differentiated cell
• Not well characterised in many tissues• Difficult to propagate and expand in numbers
outside of the body
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Nov 98- human embryonic stem cells discovered
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Human embryonic stem cells
• Derived from spare embryos before specialised tissue of the body begin to form
• Can multiply indefinitely in laboratory cultures
• Retain the ability of embryonic cells to turn into any type of tissue
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Early stages of human development
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Teratoma formed by human ES cells shows differentiation into a wide variety of cell types
hESC differentiation
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ES cell differentiation follows the road map
of embryogenesis
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Partial list of cell types derived from human ES cells in vitro
• Nerve, astrocyte, oligodendrocyte• Hematopoietic stem cells• Insulin producing cells• Cardiomyocytes• Hepatocytes• Endothelial cells• Bone forming cells• Motor neurons• Trophoblast and yolk sac cells
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Many species of mammal have now been cloned.Can cloning technology be used to surmount immunologicalbarriers to stem cell transplantation?
Somatic cell nuclear transfer and reprogramming
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Somatic cell nuclear transfer
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Induced pluripotent stem cellsMatching cells for patients
Skin cells taken from adult tissue are grown in a dish2-4 genes found in embryonic stem cells are introducedAdult cells are converted to pluripotent stem cellsThese stem cells provide a match for the patient
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Induced Pluripotent Stem Cells: The potential
• Creation of large banks of stem cell lines of desired HLA haplotypes for tissue matching
• Development of in vitro models of diseases with complex genetic susceptibility
• Partial reprogramming to heal tissues: exocrine pancreas to endocrine pancreas
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Induced Pluripotent Stem Cells: Challenges
• Can we make these cells without genetic modification?
• Are they really equivalent to human embryonic stem cells
• Embryonic stem cell research is still needed as is research in somatic cell nuclear transfer
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Stem cell research will revolutionise medicine
• Powerful new tools to study human biology in health and disease
• Normal human cells to study in the laboratory-use to develop new drugs. Alternative to animal models or direct tests on human guinea pigs.
• Cells for replacement therapy in devastating conditions involving cell loss or injury
• New understand of how the body’s natural healing process, how and why it fails, and how to improve healing
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Stem Cells to Study Disease
Marchetto et al. Cell Stem Cell 3: 649, 2008Amyelotrophic lateral sclerosis
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Stem Cells to Study CNS Development
Cortical structures in vitro from human ES cellsEiraku et al. Cell Stem Cell 3: 519, 2008
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The Eli and Edythe Broad CenterFor Regenerative Medicine and
Stem Cell Research
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Broad CIRM Center Opening29 October 2010
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The Center
• Established April 2006• Built on strengths in developmental biology,
clinical research, stem cell biology at Keck School and CHLA
• $50 million dollar commitment by USC to program development
• Now 12 PIs, over 100 staff, four core laboratories. Four administrative staff
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Center Research StrategyDiscovery Technology Treatment
Basic discoveries in stem cell biology
Platform technologies:Large scale productionDrug discovery, functionalgenomics
Patient treatmentAnd clinical trials
Engineering, Biotech,pharma
KSOM clinical groups
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Center Discovery Research ThemesStem Cell Biology
• Embryonic stem cell growth and differentiation; reprogramming adult cells
• Biology of tissue regeneration and repair; how stem cells are controlled in the body
• How cells are shaped to form organs
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Embryonic stem cells from rat
Chimeric rat pups madefrom embryonic stemcells. Chimeras are blackand white.
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An important new tool for basic research and drug discovery
• Workers have tried for 20 years to make rat embryonic stem cells• Rats are widely used in physiology and pharmacology and drug discovery• Until now there have been no tools to make specific modifications in the
rat genome to create disease models, like we can in mouse (Nobel prize 2007)
• Ying used his new discoveries about embryonic stem cell growth regulation (ES cell self renewal as a default pathway) to make rat ES cells for the first time
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Science Magazine Top Ten Breakthroughs of 2010
Gene knockout rat technology developed by Dr. Qilong Yingnamed one of Top Ten Breakthroughs of 2010 by Science magazine
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Understanding tissue repair and regeneration
Lower vertebrates can regenerate limbs, hearts and kidneys.How does this work?What stops this happeningin mammals?How do tissue stem cells functionin repair?
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Skeletal regenerationIn Mammals
Dr. Francesca Mariani
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Stem Cell Transplantation Biology
Dr. Gregor Adams and colleagues have identified a drug that promotes engraftment of blood stem cells in transplant recipients.The findings may lead to more effective treatment of blood disorders and cancers.
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Blindness
Macular degeneration is a major cause of blindness in the aging
population
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Retinal pigment epithelium and macular degeneration, a major cause of blindness
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2000- hESC can form neural tissue in vitro. The eye formsas an outgrowth of the embryonic brain
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Groppe et al. Nature420: 636, 2002
Treatment with the embryonic head inducer noggininduces differentiation of human ES cells into primitive neural tissueNestin and Sox-2, markers of early neurogenesis
2004-directed neural differentiation
Conservation of developmental mechanisms
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Retinal pigment epithelium from human neural progenitorsDoheny Eye Institute and Center Collaboration
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The road to the clinic:ES cells for eye disease
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CIRM Macular Degeneration Disease Team: The California Project to Cure Blindness
• USC Doheny Eye Institute (Mark Humayun, PI; David Hinton Co-PI; Vas Sadda, Biju Thomas, Martin Pera)
• UCSB Macular Degeneration and Stem Cell Centers (Dennis Clegg, Co-PI; Lincoln Johnson)
• UCL London Project to Cure Blindness (Pete Coffey, Partner PI funded by MRC)
• Caltech Biology and Chemistry (Scott Fraser, Bob Grubbs, Yu-Chong Tai)
• City of Hope Center for Biomedicine and Genetics GMP Facility (Larry Couture)
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Chemical genomics and stem cells
• Stem cells can be used in high throughput screens to discover new small molecules that modulate tissue regeneration or repair
• Important tool to understand stem cell control pathways-but also leads for drug development
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Dr. Kahn has focused on WNT signaling, a key pathway in development and cancer
The Wingless mutation affects wing development in the fruit fly embryo.The Wnt gene, discovered as a virus integration site for mouse breast cancer induction, is involved in many cancers.Like many developmental pathways, Wnt is evolutionarily conserved and widely deployed in stem cell regulation in many tissues.
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USC Center for Molecular Pathways and Drug Discovery
• A joint venture between the Broad Center at USC and the USC Norris Cancer Center
• Directed by Professor Michael Kahn (Broad) and Professor Heinz Lenz (Norris Cancer Center)
• Mission: discover new chemicals that modulate critical signaling pathways in stem cells and cancer and develop new therapeutics
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PBS / PBS
PBS / Nilo (100mg)
ICG-001 / Nilo (100mg)
1.0E+05
1.0E+06
1.0E+07
1.0E+08
1.0E+09
1.0E+10
10 20 28 35 42 49 56 63 77 91
Days After BMT
Flux
(pho
tons
/sec
/cm
2 /sr)
CBP/Catenin Antagonists Effectively Eliminate Cancer Stem Cells When Used in Combination Chemotherapy
0 100 200 300 4000
25
50
75
100
125
PBS / PBSPBS / NiloICG / Nilo
Days After BMT
Pe
rc
en
t s
urv
iva
l
Mice are cancerfree
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Cancer Therapy Program at NCI Considers the Development of PRI-724 its Highest Priority
“PRI-724 is a first in class and first in human agent. PRI-724 is a novel cancer stem cell targeting agent…” There are no other Wnt signaling pathway inhibitors targeting transcription.
Phase I clinical trial 7 day continuous infusion of C82 (primary endpoint MTD/biological activity, secondary endpoint proof of principle Survivin
expression in tumor and CTC)-later this year
No toxicity to normal tissues in dogs at 200X IC50 (the dose that kills
50% of tumor cells)Ph
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Zinc finger nuclease-based stem cell therapy for AIDS
- $14 million CIRM Disease Team award
Paula CannonAssociate Professor, Microbiology & ImmunologyUSC Keck School of Medicine
Dave DiGiusto John Rossi John Zaia(PI)
City of Hope AIDS lymphoma group
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The AIDS virus must enter cells to infect them.HIV-1 enters cells by binding to CD4 and a co-receptor, CCR5
CD4 and CCR5 are proteins on the surface of cells that the HIV-1 targets.-About 1% of people have 2 copies of a mutant version of CCR5 gene called CCR5D32, and theyare consequently extremely resistant to HIV-1.-The virus cannot enter their cells.
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B cells
Erythrocytes platelets
CLP
CMP
ProB
GMP
MEP
T cells
Macrophages
HSC
HIV
Can we make AIDS resistant cells byblocking CCR5 expression in
hematopoietic stem cells and their progeny?
Bone marrow stem cellsare the source of T Cells and macrophagesthat the AIDS virusinfects
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DNA binding domain
They cut the CCR5 gene
The cell repairs this break, but in a way that also destroys the CCR5 gene
DNA cleaving domain
Zinc finger nucleases to disrupt the CCR5 gene
ZFNs bind to the CCR5 gene
Zinc fingers targetspecific DNA sequences. The attachednucleases chop the DNA.
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Day -1 Day 0
Transplant into special ‘NSG’ mice
Months 2 - 4
Human hematopoietic
stem cells
Human T cells in mouse blood HIV Infection
Pre-clinical testing
HIV-1
Treat with CCR5 ZFNs
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ZFN-treated HSC generate human cells in the mice that are HIV-resistant
thymus
ZFNCtrl. Ctrl.
HIV-1 infectedCD
8
CD4
CD4
CD14
CD3
CD8
CD45
SSC
spleen
lung
Gut mucosa
Ctrl. HSC
ZFN HSC
0 2 4 6 8
CD4
T ce
lls
weeks post-HIV infection
Human cells are normal in ZFN-treated mice
Human cells killed by HIV-1 infectionin untreated mice
Holt et al. Nat Biotechnol. 2010 Aug;28(8):839-47
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Other USC Bioscience Interdisciplinary Initiatives
• Neuroscience• Biomedical Nanoscience• Clinical and Translational Sciences InstituteFunded by NIH $60 million to facilitate
translational research