Add time:08/23/2019         Source:sciencedirect.com

Bacosides, class of compounds extracted from the Bacopa monniera plant, exhibit interesting therapeutic properties, particularly enhancing cognitive functions and putative anti-amyloid activity. We show that bacoside-A exerted significant effects upon fibrillation and membrane interactions of the amyloidogenic fragment of the prion protein [PrP(106–126)]. Specifically, when co-incubated with PrP(106–126), bacoside-A accelerated fibril formation in the presence of lipid bilayers and in parallel inhibited bilayer interactions of the peptide aggregates formed in solution. These interesting phenomena were studied by spectroscopic and microscopic techniques, which suggest that bacoside A-promoted fibrillation reduced the concentration of membrane-active pre-fibrillar species of the prion fragment. This study suggests that induction of fibril formation and corresponding inhibition of membrane interactions are likely the underlying factors for ameliorating amyloid protein toxicity by bacoside-A.

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