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JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
Coagulation factor XIIIa cross-links amyloid β into dimers and oligomers and to blood proteins.
Journal of Biological Chemistry 2019 January 12
In cerebral amyloid angiopathy (CAA) and Alzheimer's disease (AD), the amyloid β (Aβ) peptide deposits along the vascular lumen, leading to degeneration and dysfunction of surrounding tissues. Activated coagulation factor XIIIa (FXIIIa) covalently cross-links proteins in blood and vasculature, such as in blood clots and on the extracellular matrix. Although FXIIIa co-localizes with Aβ in CAA, the ability of FXIIIa to cross-link Aβ has not been demonstrated. Using Western blotting, kinetic assays, and microfluidic analyses, we show that FXIIIa covalently cross-links Aβ40 into dimers and oligomers ( k cat / Km = 1.5 × 105 m-1 s-1 ), as well as to fibrin, platelet proteins, and blood clots under flow in vitro Aβ40 also increased the stiffness of platelet-rich plasma clots in the presence of FXIIIa. These results suggest that FXIIIa-mediated cross-linking may contribute to the formation of Aβ deposits in CAA and Alzheimer's disease.
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