Cell-Line Specific Protection by Berry Polyphenols Against Hydrogen Peroxide Challenge and Lack of Effect on Metabolism of Amyloid Precursor Protein
Article first published online: 15 NOV 2011
Copyright © 2011 John Wiley & Sons, Ltd.
Volume 26, Issue 7, pages 956–963, July 2012
How to Cite
Papandreou, M. A., Tsachaki, M., Efthimiopoulos, S., Klimis-Zacas, D., Margarity, M. and Lamari, F. N. (2012), Cell-Line Specific Protection by Berry Polyphenols Against Hydrogen Peroxide Challenge and Lack of Effect on Metabolism of Amyloid Precursor Protein. Phytother. Res., 26: 956–963. doi: 10.1002/ptr.3670
- Issue published online: 5 JUL 2012
- Article first published online: 15 NOV 2011
- Manuscript Accepted: 2 SEP 2011
- Manuscript Revised: 1 SEP 2011
- Manuscript Received: 20 MAY 2011
- amyloid fibrillogenesis;
- Vaccinium angustifolium;
- APP metabolism
Amyloid precursor protein (APP) altered metabolism, Aβ-overproduction/aggregation and oxidative stress are implicated in the development of Alzheimer's disease pathology. Based on our previous data indicating that administration of a polyphenol-rich (PrB) blueberry extract (from wild Vaccinium angustifolium) is memory enhancing in healthy mice and in order to delineate the neuroprotective mechanisms, this study investigated the antioxidant effects of PrB in H2O2-induced oxidative damage, Aβ peptide fibrillogenesis and APP metabolism. PrB suppressed H2O2-initiated oxidation (DCF assay) and cell death (MTT assay) in SH-SY5Y cells. Protective effects were observed on Chinese hamster ovary (CHO) cells overexpressing APP770 carrying the mutation Val717Phe only at high concentrations, while further damage on HEK293 cells was induced after co-treatment with 250 µ m H2O2 and PrB in comparison with H2O2 alone. Using the thioflavine T assay, blueberry polyphenols inhibited Aβ-aggregation (~70%, 15 µg/mL) in a time-dependent manner, while in the CHOAPP770 cells it had no effect on APP metabolism as assessed by western blot. The results suggest that blueberry polyphenols exhibit antioxidant and/or pro-oxidant properties according to the cellular environment and have no effect on APP metabolism. Copyright © 2011 John Wiley & Sons, Ltd.