Altered Distribution of the Gangliosides GM1 and GM2 in Alzheimer's Disease

• Background: Alzheimer's disease (AD) is a neurodegenerative disorder where beta-amyloid tends to aggregate and form plaques. Lipid raft-associated ganglioside GM1 has been suggested to facilitate beta-amyloid aggregation; furthermore, GM1 and GM2 are increased in lipid rafts isolated from cerebral cortex of AD cases. Aim/Method: The distribution of GM1 and GM2 was studied by immunohistochemistry in the frontal and temporal cortex of AD cases. Frontotemporal dementia (FTD) was included as a contrast group. Results: The distribution of GM1 and GM2 changes during the process of AD (n = 5) and FTD (n = 3) compared to controls (n = 5). Altered location of the GM1-positive small circular structures seems to be associated with myelin degradation. In the grey matter, the staining of GM1-positive plasma membranes might reflect neuronal loss in the AD/FTD tissue. The GM1-positive compact bundles were only visible in cells located in the AD frontal grey matter, possibly reflecting raft formation of GM1 and thus a pathological connection. Furthermore, our results suggest GM2 to be enriched within vesicles of pyramidal neurons of the AD/FTD brain. Conclusion: Our study supports the biochemical finding of ganglioside accumulation in cellular membranes of AD patients and shows a redistribution of these molecules. Copyright (C) 2012 S. Karger AG, Basel

Ämnesord

MEDICIN OCH HÄLSOVETENSKAP  -- Klinisk medicin -- Neurologi (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Clinical Medicine -- Neurology (hsv//eng)

MEDICIN OCH HÄLSOVETENSKAP  -- Klinisk medicin -- Psykiatri (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Clinical Medicine -- Psychiatry (hsv//eng)

Nyckelord

Glycosphingolipids

Alzheimer's disease

Frontotemporal dementia

Immunohistochemistry

Temporal

amyloid precursor protein

frontotemporal lobar degeneration

lipid

rafts

beta-protein

monoclonal-antibody

endogenous seed

gamma-secretase

membrane microdomains

binding epitope

senile plaques

khann g

1984

neurology

v34

p939

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)