期刊
DIABETES
卷 66, 期 11, 页码 2849-2856出版社
AMER DIABETES ASSOC
DOI: 10.2337/db17-0002
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资金
- Ager - Agroalimentare e ricerca (Claims of Olive oil to iMProvE The market ValuE of the product [COMPETITIVE])
This study explored the role of irisin as a new pancreatic beta-cell secretagogue and survival factor and its potential role in the communication between skeletal muscle and pancreatic beta-cells under lipotoxic conditions. Recombinant irisin stimulated insulin biosynthesis and glucose-stimulated insulin secretion (GSIS) in a PKA-dependent manner and prevented saturated fatty acid-induced apoptosis in human and rat pancreatic beta-cells, as well as in human and murine pancreatic islets, via AKT/BCL2 signaling. Treatment of myotubes with 0.5 mmol/L palmitate for 4 h, but not with oleate, promoted an increase in irisin release in the culture medium. Moreover, increased serum levels of irisin were observed in mice fed with a high-fat diet. Mouse serum rich in irisin and the conditioned medium from myotubes exposed to palmitate for 4 h significantly reduced apoptosis of murine pancreatic islets and insulin-secreting INS-1E cells, respectively, and this was abrogated in the presence of an irisin-neutralizing antibody. Finally, in vivo administration of irisin improved GSIS and increased beta-cell proliferation. In conclusion, irisin can promote beta-cell survival and enhance GSIS and may thus participate in the communication between skeletal muscle and beta-cells under conditions of excess saturated fatty acids.
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