Benzbromarone, quercetin, and folic acid inhibit amylin aggregation

Laura C. López, Olga Varea, Susanna Navarro, José A. Carrodeguas, Natalia Sanchez De Groot, Salvador Ventura, Javier Sancho

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Abstract

© 2016 by the authors. Human Amylin, or islet amyloid polypeptide (hIAPP), is a small hormone secreted by pancreatic ˜-cells that forms aggregates under insulin deficiency metabolic conditions, and it constitutes a pathological hallmark of type II diabetes mellitus. In type II diabetes patients, amylin is abnormally increased, self-assembled into amyloid aggregates, and ultimately contributes to the apoptotic death of _-cells by mechanisms that are not completely understood. We have screened a library of approved drugs in order to identify inhibitors of amylin aggregation that could be used as tools to investigate the role of amylin aggregation in type II diabetes or as therapeutics in order to reduce ˜-cell damage. Interestingly, three of the compounds analyzed—benzbromarone, quercetin, and folic acid—are able to slow down amylin fiber formation according to Thioflavin T binding, turbidimetry, and Transmission Electron Microscopy assays. In addition to the in vitro assays, we have tested the effect of these compounds in an amyloid toxicity cell culture model and we have found that one of them, quercetin, has the ability to partly protect cultured pancreatic insulinoma cells from the cytotoxic effect of amylin. Our data suggests that quercetin can contribute to reduce oxidative damage in pancreatic insulinoma ˜ cells by modulating the aggregation propensity of amylin.
Original languageEnglish
Article number964
JournalInternational Journal of Molecular Sciences
Volume17
Issue number6
DOIs
Publication statusPublished - 1 Jun 2016

Keywords

  • Aggregation
  • Amylin
  • Amyloid
  • Benzbromarone
  • Folic acid
  • Quercetin
  • Type II diabetes

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    López, L. C., Varea, O., Navarro, S., Carrodeguas, J. A., De Groot, N. S., Ventura, S., & Sancho, J. (2016). Benzbromarone, quercetin, and folic acid inhibit amylin aggregation. International Journal of Molecular Sciences, 17(6), [964]. https://doi.org/10.3390/ijms17060964