Author(s): Rocha S, Cardoso I, Brner H, Pereira MC, Saraiva MJ,
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Abstract The sequence LPFFD (iAbeta(5)) prevents amyloid-beta peptide (Abeta) fibrillogenesis and neurotoxicity, hallmarks of Alzheimer's disease (AD), as previously demonstrated. In this study iAbeta(5) was covalently linked to poly(ethylene glycol) (PEG) and the activity of conjugates was assessed and compared to the activity of the peptide alone by in vitro studies. The conjugates were characterized by MALDI-TOF. Competition binding assays established that conjugates retained the ability to bind Abeta with similar strength as iAbeta(5). Transmission electron microscopy analysis showed that iAbeta(5) conjugates inhibited amyloid fibril formation, which is in agreement with binding properties observed for the conjugates towards Abeta. The conjugates were also able to prevent amyloid-induced cell death, as evaluated by activation of caspase 3. These results demonstrated that the biological activity of iAbeta(5) is not affected by the pegylation process.
This article was published in Biochem Biophys Res Commun
and referenced in Journal of Bioequivalence & Bioavailability