Aspalathin Protects Insulin-Producing β Cells against Glucotoxicity and Oxidative Stress-Induced Cell Death

Céline Moens, Mohammed Bensellam, Eddy Himpe, Christo J F Muller, Jean-Christophe Jonas, Luc Bouwens

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

SCOPE: Aspalathin, the main polyphenolic phytochemical of rooibos (Aspalathus linearis), has been attributed with health promoting properties, including a glucose lowering effect that can prove interesting for application as nutraceutical or therapeutic in (pre-)diabetics. Preservation of β cell mass in the pancreas is considered a key issue for diabetes prevention or treatment, therefore the aim is to investigate whether aspalathin also has β cell cytoprotective potential.

METHODS AND RESULTS: Rat pancreatic islets and the β cell line Insulinoma 1E (INS1E) are studied in vitro after exposure to various cytotoxic agents, namely streptozotocin (STZ), hydrogen peroxide, or chronic high glucose. The effect of aspalathin on cell survival and apoptosis is studied. Expression of relevant cytoprotective genes is analyzed by qRT-PCR and proteins by Western blot. Aspalathin is found to protect β cells against cytotoxicity and apoptosis. This is associated with increased translocation of nuclear factor erythroid 2-related factor 2 (NRF2) and expression of its antioxidant target genes heme oxygenase 1 (Hmox1), NAD(P)H quinone dehydrogenase 1 (Nqo-1), and superoxide dismutase 1 (Sod1).

CONCLUSION: It is proposed that aspalathin protects β cells against glucotoxicity and oxidative stress by increasing the expression of NRF2-regulated antioxidant enzymes. This indicates that aspalathin is an interesting β cell cytoprotectant.

Original languageEnglish
Article number1901009
JournalMolecular Nutrition & Food Research
Volume64
Issue number8
Early online date3 Feb 2020
DOIs
Publication statusPublished - 12 Feb 2020

Bibliographical note

© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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