Serum amyloid P component accelerates the formation and enhances the stability of amyloid fibrils in a physiologically significant under-saturated solution of amyloid-β42.

The mechanism whereby an under-saturated solution of amyloid-β (Aβ)42 precipitates as β sheets in vivo in Alzheimer's disease remains to be elucidated. Herein we present in vitro evidence that serum amyloid P component may mediate this process through its acceleration of amyloid formation from an under-saturated solution of Aβ42 and subsequently its stabilization of the amyloid fibrils formed over physiologically significant timeframes. Our observations support serum amyloid P component as a therapeutic target in Alzheimer's disease.