Blood-borne factors inhibit Alzheimer's beta-amyloid fibril formation in vitro.
Soluble amyloid beta-protein (Abeta) does not aggregate to beta-amyloid fibrils (fAbeta) in the brain of normal humans. We recently found that the cerebrospinal fluid (CSF) from non-Alzheimer's disease (AD) subjects inhibited the formation of fAbeta(1-40) and fAbeta(1-42) more strongly than that from AD subjects, although the CSF obtained from both groups inhibited the fAbetas formation in vitro. Here, we examined the influence of plasma obtained from AD, non-AD and healthy control (CTL) subjects on the formation of fAbeta(1-40) and fAbeta(1-42) in vitro. Although the plasma obtained from all groups inhibited the formation of fAbeta(1-40) and fAbeta(1-42), the plasma from non-AD and CTL subjects inhibited the formation of fAbetas more strongly than that from AD subjects. These results indicate that the plasma as well as CSF in AD would provide a molecular environment favorable for fAbeta formation, suggesting a decrease of specific inhibitory factors and/or increase of specific accelerating factors.
Ono
Kenjiro
K
Department of Neurology and Neurobiology of Aging, Kanazawa University Graduate School of Medical Science, Kanazawa 920-8640, Japan.
Noguchi-Shinohara
Moeko
M
Samuraki
Miharu
M
Matsumoto
Yasuko
Y
Yanase
Daisuke
D
Iwasa
Kazuo
K
Naiki
Hironobu
H
Yamada
Masahito
M
D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000097:blood / Q000134:cerebrospinal fluid* / Q000503:physiopathology; D016229:Amyloid beta-Peptides / Q000737:chemistry / Q000378:metabolism* / Q000648:ultrastructure; D001923:Brain Chemistry / Q000502:physiology; D002555:Cerebrospinal Fluid / Q000737:chemistry / Q000378:metabolism*; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods; D005260:Female; D006801:Humans; D066298:In Vitro Techniques; D008297:Male; D046529:Microscopy, Electron, Transmission / Q000379:methods; D008875:Middle Aged; D010446:Peptide Fragments; D058225:Plaque, Amyloid / Q000737:chemistry / Q000378:metabolism* / Q000648:ultrastructure; D010949:Plasma / Q000737:chemistry / Q000378:metabolism; D012189:Retrospective Studies; D013050:Spectrometry, Fluorescence / Q000379:methods; D013997:Time Factors
D016229:Amyloid beta-Peptides; D010446:Peptide Fragments; C078592:amyloid beta-protein (1-40); C075222:amyloid beta-protein (1-42)