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Synaptic proteins predict cognitive decline in Alzheimer's disease and Lewy body dementia
Author(s) -
Bereczki Erika,
Francis Paul T.,
Howlett David,
Pereira Joana B.,
Höglund Kina,
Bogstedt Anna,
CedazoMinguez Angel,
Baek JeanHa,
Hortobágyi Tibor,
Attems Johannes,
Ballard Clive,
Aarsland Dag
Publication year - 2016
Publication title -
alzheimer's and dementia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.713
H-Index - 118
eISSN - 1552-5279
pISSN - 1552-5260
DOI - 10.1016/j.jalz.2016.04.005
Subject(s) - dementia , dementia with lewy bodies , lewy body , neuroscience , cognitive decline , snap25 , psychology , disease , cognition , medicine , pathology , biology , synaptic vesicle , vesicle , membrane , genetics
Our objective was to compare the levels of three synaptic proteins involved in different steps of the synaptic transmission: Rab3A, SNAP25, and neurogranin, in three common forms of dementia: Alzheimer's disease (AD), dementia with Lewy bodies (DLB), and Parkinson's disease dementia. Methods A total of 129 postmortem human brain samples were analyzed in brain regional specific manner exploring their associations with morphologic changes and cognitive decline. Results We have observed robust changes reflecting synaptic dysfunction in all studied dementia groups. There were significant associations between the rate of cognitive decline and decreased levels of Rab3 in DLB in the inferior parietal lobe and SNAP25 in AD in the prefrontal cortex. Of particular note, synaptic proteins significantly discriminated between dementia cases and controls with over 90% sensitivity and specificity. Discussion Our findings suggest that the proposition that synaptic markers can predict cognitive decline in AD, should be extended to Lewy body diseases.