subhojit roy, md, phd€¦ · subhojit roy, md, phd institution and location. degree (if...
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Subhojit Roy, MD, PhD
INSTITUTION AND LOCATION DEGREE (if applicable) YEAR(s) FIELD OF STUDY
University of Pennsylvania, Philadelphia Post-doc 7/05-12/07
Neuronal cell-biology, neuropathology
University of Pennsylvania hospital, Philadelphia
Residency/ Fellowship 7/01-6/06 Anatomic/Neuro-pathology
(clinical) Temple University school of medicine, Philadelphia PhD 7/97-6/01 Cell Biology/Neuroscience
R.G. Kar Medical College, Calcutta, India MD 9/89-6/96 Medicine
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AXONAL TRANSPORT/ NEURONAL
TRAFFICKING NEURODEGENERATION
www.roylab.org
UTPAL ARCHAN LINA YONG
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2ND LIFE…
http://adrc.ucsd.edu/
http://www.nia.nih.gov/alzheimers/alzheimers-disease-research-centers
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Human neurodegenerative neuropathology: the template for asking the right questions
• Look at the diseased brain to ask what’s really happening?
• Do experiments in simple model-systems and test/validate hypotheses in human brain tissue
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- System of NIH-funded brain banks in the US - Why neuropathology? - Different neurodegenerative pathologies
Brain banking
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Alzheimer’s Disease Centers
• Clinical core – patient follow-up • Administrative/education core • Neuropathology core – neuropathologist..
Brain Dissected, ½ fixed, half stored in formalin Tissue sections from fixed brains Slides H&E and immunostains (tau, amyloid beta, synuclein) Final diagnosis to patient family
- Tissue exchange between centers - Numerous research projects supported within and outside institution
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5604 Diagnosis MF HP ST AM Tau AD (Br. 5/6) + ?CBD 3+ (WM path) 3+ 3+ Abeta 3+ (vasc+) 3+ 3+ a-syn Rare
5605
Tau (Br. 2/3) + ? Unknown Neg 2+ 1+
Abeta 2+ None (?) 1+ a-syn Neg
5608
Tau ?LBD (extra stains needed) Neg 1+ Neg
Abeta Neg Neg (?) Neg a-syn 3+
5609 ?LBD (extra stains needed)
Tau Neg 1+ (only EC) Neg Abeta Neg Neg 1+ a-syn 2+
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"Sorting through the nomenclature quagmire of
neurodegenerative diseases using neuropathology"
Subhojit Roy, MD, PhD
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PiD
Neuropathology of Dementias
AD LBD DLB
LBVAD
AGD FTDP-17
CBD PSP
FTDP-17
FTD +/- MND
FTD-TDP-43
Other NFID DLDH
MSA
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PiD
Neuropathology of Dementias
AD LBD DLB
LBVAD
AGD FTDP-17
CBD PSP
FTDP-17
FTD +/- MND
FTD-TDP-43
Other NFID DLDH
MSA
PROTEIN AGGREGATION
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• Proteins that are normally soluble, become insoluble and fibrillize intra-cellularly (tau, alpha-synuclein) or extra-cellularly (amyloid-beta)
• Aggregates into similar fibrillar forms “amyloid” that appear structurally and biophysically similar
• Dogma: Proteinaceous aggregates drives neuropathology
Concept of protein aggregation
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Brief discussion of:
• Simple algorithm for neuropathologic
diagnosis using two immunostains • Story of TDP-43: recent example of
neuropathology-driven research
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Courtesy: WUSM tutorial
Basic neuroanatomy
Basic motor pathway Basic sensory pathway (touch)
Neocortex/isocortex= 6 layered cortex
Archi/paleocortex= limbic system
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Basic neuroanatomy
Courtesy: WUSM tutorial
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Principal cell types of the nervous system
• CNS: – Neuron – Astrocyte – Oligodendrocyte – Microglia
• PNS
– Neuron – Schwann cell
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14) Hippocampus I with entorhinal and trans- entorhinal cortex
a) Sensory cortex
5) Angular cortex
2) Mid-frontal cortex 1) Motor cortex
b) Wernicke's area (left hemisphere) c) Broca's area
(left hemisphere)
3) Orbital frontal cortex
7) Superior and middle temporal gyrus
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What can we see on H&E stains?
- Some tangles, neuritic dystrophy - Granulovauolar degeneration - Some Lewy bodies - Pick bodies
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Tau positive inclusions - composed predominantly of:
Neuropathologic Diagnosis of Dementias
NFTs 3R/4R-tau
Neuronal/glial inclusions
4R-tau
AD AD+LBD
AGD*
FTDP-17
CBD PSP
FTDP-17
PiD FTDP-17
Pick bodies 3R-tau
Absence of tau positive inclusions
Ubiquitinated Inclusions
TDP43+
α-synuclein inclusions
FTD +/- MND
PD DLB MSA
Other NFID, DLDH
Mark Forman, MD, PhD
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Alzheimer’s disease
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Entorhinal Cortex
Tangles predictive of AD progression
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Alzheimer’s Disease Braak & Braak staging of NFTs
I-II III-IV V-VI
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Thioflavin stains
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Tau pathology
Neurofibrillary tangles Neuritic plaques Neuropil threads
Alzheimer’s Disease case
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Abeta immunostain
Tau immunostain
Thioflavin
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Tau positive inclusions - composed predominantly of:
Neuropathologic Diagnosis of Dementias
NFTs 3R/4R-tau
Neuronal/glial inclusions
4R-tau
AD AD+LBD
AGD*
FTDP-17
CBD PSP
FTDP-17
PiD FTDP-17
Pick bodies 3R-tau
Absence of tau positive inclusions
Ubiquitinated Inclusions
TDP43+
α-synuclein inclusions
FTD +/- MND
PD DLB MSA
Other NFID, DLDH
“other” tauopathies
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AD v/s Frontotemporal dementia
• Memory loss v/s ‘bizzare’ symptoms
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“Other tauopathies”- Pick’s disease
- Tau positive “Pick bodies”
Picks case
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Predominantly 3R tau present!
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“Other tauopathies”- Corticobasilar degeneration (CBD) and Progressive Supranuclear Palsy (PSP)
Clinical: rigidity, speech disorder (apraxia, aphasia),
CBD (more cortical pathology):
1) Tau + “coiled bodies” in white matter
2) Tau + “thread pathology” in white matter
3) Tau + “pre-tangles” in cortex
4) Tau + “astrocytic plaques” in cortex
PSP (less/no cortical pathology):
1) Tau + “globose tangles” in brainstem nuclei
2) Tau + “tufted astrocytes” in peri-Rolandic cortex and striatum
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CBD (a low-power diagnosis!)
Cortex
White matter
Tau immunostain CBD case
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Extensive tau pathology in white matter, arrows show “coiled
bodies”
Frontal white matter
Frontal white matter
2/1/05
CBD
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“Coiled bodies”
CBD
“Astrocytic plaques”
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Frontal gliosis and neuronal loss
“Ballooned” neuron in frontal cortex
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“Other tauopathy”- PSP
“tufted astrocytes”
Striatum- tau immunostain Pons- tau immunostain
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“Other tauopathies”- Corticobasilar degeneration (CBD) and Progressive Supranuclear Palsy (PSP)
Clinical: rigidity, speech disorder (apraxia, aphasia),
CBD (more cortical pathology):
1) Tau + “coiled bodies” in white matter
2) Tau + “thread pathology” in white matter
3) Tau + “pre-tangles” in cortex
4) Tau + “astrocytic plaques” in cortex
PSP (less/no cortical pathology):
1) Tau + “globose tangles” in brainstem nuclei
2) Tau + “tufted astrocytes” in peri-Rolandic cortex and striatum
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Tau positive inclusions - composed predominantly of:
Neuropathologic Diagnosis of Dementias
NFTs 3R/4R-tau
Neuronal/glial inclusions
4R-tau
AD AD+LBD
AGD*
FTDP-17
CBD PSP
FTDP-17
PiD FTDP-17
Pick bodies 3R-tau
Absence of tau positive inclusions
Ubiquitinated Inclusions
TDP43+
α-synuclein inclusions
FTD +/- MND
PD DLB MSA
Other NFID, DLDH
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Alpha-synuclein and “Lewy body” diseases PD DLB
MSA
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Tau positive inclusions - composed predominantly of:
Neuropathologic Diagnosis of Dementias
NFTs 3R/4R-tau
Neuronal/glial inclusions
4R-tau
AD AD+LBD
AGD*
FTDP-17
CBD PSP
FTDP-17
PiD FTDP-17
Pick bodies 3R-tau
Absence of tau positive inclusions
Ubiquitinated Inclusions
TDP43+
α-synuclein inclusions
FTD +/- MND
PD DLB MSA
Other NFID, DLDH
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Story of TDP-43: a first-hand perspective
Formerly “FTD-U”
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Tau positive inclusions - composed predominantly of:
Neuropathologic Diagnosis of Dementias
NFTs 3R/4R-tau
Neuronal/glial inclusions
4R-tau
AD AD+LBD
AGD*
FTDP-17
CBD PSP
FTDP-17
PiD FTDP-17
Pick bodies 3R-tau
Absence of tau positive inclusions
Ubiquitinated Inclusions
TDP43+
α-synuclein inclusions
FTD +/- MND
PD DLB MSA
Other NFID, DLDH
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Story of TDP-43: a first-hand perspective
Take human FTD-U cases
Make biochemical extracts
Inject extracts in mice to make monoclonal antibodies
Screen FTD-U cases with the monoclonal antibodies
Pick out antibodies that stain the FTD-U cases
Identify the antigen that the antibody binds to by LC-MS/MS
Identify the protein in the ubiquitinated FTD inclusions
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Story of TDP-43: a personal perspective
PubMed citations of “TDP-43”: >1000
Science 314, 130 (2006);
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Adjacent sections stained with Ubiquitin and TDP-43
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QUIZ
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FRONTAL/ TEMPORAL
HIPP
MIDBRAIN
PONS/MEDULLA
TAU α-SYNUCLEIN Cortex
White matter
+ α-synuclein
α-synuclein
TDP-43
6 sections, 2 immunostains
= AD Braak V-VI
= CBD
= DLB
= AD Braak II-IV = Pick’s disease
= PD
= PSP
= FTD-TDP-43
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Tau positive inclusions - composed predominantly of:
Neuropathologic Diagnosis of Dementias
NFTs 3R/4R-tau
Neuronal/glial inclusions
4R-tau
AD AD+LBD
AGD*
FTDP-17
CBD PSP
FTDP-17
PiD FTDP-17
Pick bodies 3R-tau
Absence of tau positive inclusions
Ubiquitinated Inclusions
TDP43+
α-synuclein inclusions
FTD +/- MND
PD DLB MSA
Other NFID, DLDH
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"Sorting through the nomenclature quagmire of
neurodegenerative diseases using neuropathology"
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Alzheimer’s Disease Centers
• Clinical core – patient follow-up • Administrative/education core • Neuropathology core
Brain Dissected, ½ fixed, half stored in formalin Tissue sections from fixed brains Slides H&E and immunostains (tau, amyloid beta, synuclein) Final diagnosis to patient family
- Tissue exchange between centers - Numerous research projects supported within and outside institution