Overview Flashcards

1
Q

AD is characterized by Extracellular accumulation of ____1____ and Intracellular accumulation of ____2____.

A
  1. beta-A4 amyloid (plaques)
  2. tau (neurofibrillary tangles and neuropil threads)

AD is characterized by extracellular accumulation of beta-A4 amyloid (plaques) and intracellular accumulation of tau (neurofibrillary tangles and neuropil threads)

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2
Q

NFTs are composed of fibrillar aggregates (above) made of _____________.

A

paired helical filaments.

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3
Q

CERAD (Consortium to Establish a Registry for Alzheimer’s Disease) criteria for the neuropathological diagnosis of AD is based on a clinical history of dementia and age-related numbers of ______________.

A

neuritic plaques

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4
Q

NFTs are made of abnormal accumulations of _________________.

A

hyerphosphorylated tau protein

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5
Q

In the late stages of AD, NFTs are frequent in neocortical areas and accompanied by numerous ______________.

A

neuropil threads

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6
Q

NFTs changes are evaluated according to the _______________.

A

Braak staging system

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7
Q

Parkinson’s Disease is characterized by loss of pigment in the _______ and ________.

A

substantia Nigra & locus ceruleus

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8
Q

Neuronal loss in the substantia nigra is accompanied by _______ and _______.

A

numerous pigment-laden macrophages (melanophages, arrow) and gliosis

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9
Q

Lewy bodies are abnormal aggregates of _____1_____.
Immunostaining for _____1_____ strongly labels both Lewy Bodies and Lewy neurites in the substantia nigra. Both are also immunoreactive to ____2____.

A
  1. alpha-synuclein
  2. ubiquitin
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10
Q

Neurodegenerative diseases characterized by abnormal intracellular aggregation of alpha-synuclein (4):

A

Parkinson’s Disease
Dementia with Lewy Bodies
Lewy Body Variant of AD
Multiple System Atrophies
OPCA
SND
Shy-Drager Syndrome

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11
Q

Which 5 brain areas are used for Lewy Body scoring?

A

Frontal, Cingulate, Temporal,, Transentorhinal, Parietal

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12
Q

Gross findings in Pick’s Disease.

A

severe atrophy of the frontal and temporal lobes (lobar atrophy)
- with “knife-edge” atrophy of the gyri.

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13
Q

Histologic findings in Pick’s Disease.
-Which other degenerative diseases show similar findings?

A

Cortical neuronal loss with intense gliosis
-FTLD

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14
Q

Which immunostain will highlight Pick bodies?

A

Tau

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15
Q

Progressive Supranuclear Palsy (PSP) typically shows severe depigmentation of the __________ and ___________.

A

substantia nigra and locus ceruleus

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16
Q

The most common areas affected in PSP:

A

SUBSTANTIA NIGRA
GLOBUS PALLIDUS
SUBTHALAMIC NUCLEI
CN III
CN IV

hippocampus, entorhinal cortex, dentate nuclei, red nuclei, periaqueductal gray matter, colliculi, as well as CN X and XII nuclei.

Putamen, pontine nuclei, olivary nuclei, and cortex may also show GLOBOSE TANGLES

17
Q

_______________ characterize PSP and can be seen with silver stains (Gallyas).

A

Globose NFTs

18
Q

Progressive Supranuclear palsy (PSP)

T/F: Globose NFTs are tau-positive

A

True.

NOTE: Many glial cells also contain abnormal accumulations of tau.

19
Q

Huntington’s Disease - Gross findings.

A

Atrophy of basal ganglia (Severe)
Cortical atrophy (Mild)

20
Q

Huntington’s Disease
-Which groups of neurons are mostly affected?

A

aspiny (small, ACh+) neurons > Spiny (large, GABA+) neurons.

21
Q

Aspiny neurons:
-Size
-Neurotransmitter

A

-Small
-Acetylcholine (ACh)+

22
Q

Spiny neurons
-Size
-Neurotransmitter

A

-Large
-GABA+

23
Q

Huntington’s Disease.

Caudate atrophy is assessed using the ___________ ________ system

A

Vonsattel grading

24
Q

Amyotrophic Lateral Sclerosis (ALS):

ALS is characterized by loss of what cells?

A

Upper and Lower Motor Neurons

25
Q

Amyotrophic Lateral Sclerosis (ALS):

Gross findings

A

The spinal cord often shows atrophy of the cervical and lumbar enlargements as well as of the anterior spinal roots.

In some cases, atrophy of the pre-central gyrus can be observed.

26
Q

Amyotrophic Lateral Sclerosis (ALS):

In cervical and lumbar regions, the _____1_____ have numerous large _____2______ neurons which are lost in ALS.

A
  1. anterior horns
  2. Lower motor neurons
27
Q
A

In remaining LMN, there may be Bunina bodies (left) and large hyaline inclusions (right)

28
Q
A

Ubiquitin immunostains reveal some LMN with ubiquitin skeins.

29
Q

ALS - Myelin stain
-pathophysiology and areas affected

A

Loss of UMN leads to degeneration of motor axons
- resulting in pallor of the cerebral peduncles, pyramids (right, upper) and
both lateral and anterior corticospinal tracts in the spinal cord (right, lower)

30
Q
A

Loss of neurons in the motor cortex is accompanied by gliosis, which is lacking in the adjacent sensory cortex

31
Q

Prion Encephalopathies.

Prion protein is a normal abundant protein in the brain. The function is unknown. It has a normal secondary structure dominated by ______1______ formations and is easily digested by proteases

Abnormal prion protein (the cause of the prion diseases) is the same protein, but has a secondary structure dominated by ______2______, which makes it more prone to aggregate and resitant to protease digestion.

A
  1. alpha-helical
  2. beta-pleated sheets
32
Q

T/F. Most cases of CJD show little or no cerebral atrophy

A

True

33
Q

Characteristic histologic changes in CJD.

A

Spongiform changes of both cortical and deep gray matter, neuronal loss and gliosis characterize the CJD brain.

34
Q

In 15% of CJD cases “___1___” (prion) plaques can be found in the ____2____.

A
  1. kuru
  2. Cerebellum
35
Q

Gerstmann-Straussler-Scheinker (GSS).

GSS has numerous prion plaques primarily in the _________. There is little ________ change.

A

Cerebellum
Spongiform

36
Q

vCJD has distinctive pathology consisting of numerous cortical and cerebellar “______” plaques and moderate _______ change.

A

Florid
Spongiform

37
Q

HIV Encephalitis is characterized by ________________ and perivascular accumulations of ______________, most of which are HIV+

A

multinucleated giant cells
macrophages