Beta cell compensation for insulin resistance in Zucker fatty rats: increased lipolysis and fatty acid signalling.

Abstract:

AIMS/HYPOTHESIS:The aim of this study was to determine the role of fatty acid signalling in islet beta cell compensation for insulin resistance in the Zucker fatty fa/fa (ZF) rat, a genetic model of severe obesity, hyperlipidaemia and insulin resistance that does not develop diabetes. MATERIALS AND METHODS:NEFA augmentation of insulin secretion and fatty acid metabolism were studied in isolated islets from ZF and Zucker lean (ZL) control rats. RESULTS:Exogenous palmitate markedly potentiated glucose-stimulated insulin secretion (GSIS) in ZF islets, allowing robust secretion at physiological glucose levels (5-8 mmol/l). Exogenous palmitate also synergised with glucagon-like peptide-1 and the cyclic AMP-raising agent forskolin to enhance GSIS in ZF islets only. In assessing islet fatty acid metabolism, we found increased glucose-responsive palmitate esterification and lipolysis processes in ZF islets, suggestive of enhanced triglyceride-fatty acid cycling. Interruption of glucose-stimulated lipolysis by the lipase inhibitor Orlistat (tetrahydrolipstatin) blunted palmitate-augmented GSIS in ZF islets. Fatty acid oxidation was also higher at intermediate glucose levels in ZF islets and steatotic triglyceride accumulation was absent. CONCLUSIONS/INTERPRETATION:The results highlight the potential importance of NEFA and glucoincretin enhancement of insulin secretion in beta cell compensation for insulin resistance. We propose that coordinated glucose-responsive fatty acid esterification and lipolysis processes, suggestive of triglyceride-fatty acid cycling, play a role in the coupling mechanisms of glucose-induced insulin secretion as well as in beta cell compensation and the hypersecretion of insulin in obesity.

journal_name

Diabetologia

journal_title

Diabetologia

authors

Nolan CJ,Leahy JL,Delghingaro-Augusto V,Moibi J,Soni K,Peyot ML,Fortier M,Guay C,Lamontagne J,Barbeau A,Przybytkowski E,Joly E,Masiello P,Wang S,Mitchell GA,Prentki M

doi

10.1007/s00125-006-0305-5

subject

Has Abstract

pub_date

2006-09-01 00:00:00

pages

2120-30

issue

9

eissn

0012-186X

issn

1432-0428

journal_volume

49

pub_type

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