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© Research
Publication : Journal of Alzheimer's disease : JAD

Plasma gelsolin is decreased and correlates with rate of decline in Alzheimer’s disease

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Journal of Alzheimer's disease : JAD - 01 Jan 2010

Güntert A, Campbell J, Saleem M, O'Brien DP, Thompson AJ, Byers HL, Ward MA, Lovestone S

Link to Pubmed [PMID] – 20571216

J. Alzheimers Dis. 2010;21(2):585-96

Alzheimer’s disease (AD) is a progressive neurodegenerative disorder where definite diagnosis can only be made postmortem, and for which the most promising peripheral markers of disease state and severity have been found in the cerebrospinal fluid. However, recent results suggest that differences in the levels of certain plasma proteins do exist between AD patients and non-demented controls (NDC). Herein, we undertook an untargeted discovery study using isobaric mass tagging to compare the plasma protein levels between slow cognitive declining AD patients, rapid cognitive declining AD patients (RCD) and NDC subjects. Subsequent relative quantification and statistical analysis identified a list of candidate proteins able to distinguish RCD from NDC groups based on multivariate analysis. Selected proteins were then validated by western blot analysis in an independent sample set of 60 AD and 35 NDC subjects. In this cohort, AD patients displayed significantly lower plasma gelsolin levels compared to NDC subjects. Additionally, gelsolin levels correlated with disease progression rate estimated by Mini-Mental Status Examination decline per year. In order to further investigate gelsolin expression, three different brain regions from an additional cohort of 23 subjects and their respective plasma samples were analysed. No significant change in brain gelsolin levels could be established between AD and control subjects. Interestingly, this study reveals yet another condition where plasma gelsolin levels are decreased and our findings, together with the reported interaction of gelsolin and amyloid-beta, makes plasma gelsolin an attractive candidate for further studies targeted at better understanding disease progression in AD.

http://www.ncbi.nlm.nih.gov/pubmed/20571216