Downregulation of islet hormone-sensitive lipase during long-term high-fat feeding.

Abstract:

:Lipid accumulation in pancreatic beta-cells during high-fat (HF) feeding may be involved in inducing a defective insulin secretion due to lipotoxicity. Hormone-sensitive lipase (HSL) is expressed and active in beta-cells, but its importance for islet dysfunction during the development of type 2 diabetes is not known. In this study, prolonged HF feeding of C57BL/6J mice, resulted in decreased HSL expression in islets, representing only 25+/-4% of the levels observed in controls. This was paralleled by triglyceride accumulation and blunted insulin secretion both in vivo and in vitro. After switching the HF diet to a LF diet, HSL expression increased 10-fold compared to the HF fed mice. This was accompanied by reduced triglyceride levels and a restored insulin secretion. These results support the notion that HSL plays a critical role in the regulation of intracellular triglyceride levels in beta-cells, and that downregulation of the enzyme may serve to protect against fatty acid-induced islet dysfunction.

authors

Winzell MS,Holm C,Ahrén B

doi

10.1016/s0006-291x(03)00552-7

subject

Has Abstract

pub_date

2003-05-02 00:00:00

pages

273-8

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006291X03005527

journal_volume

304

pub_type

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