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Deprecated: Implicit conversion from float 213.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 J+Biol+Chem 2016 ; 291 (25): 13063-75 Nephropedia Template TP
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The Amplifying Pathway of the ?-Cell Contributes to Diet-induced Obesity* #MMPMID27137930
Vetterli L; Carobbio S; Frigerio F; Karaca M; Maechler P
J Biol Chem 2016[Jun]; 291 (25): 13063-75 PMID27137930show ga
Efficient energy storage in adipose tissues requires optimal function of the insulin-producing ?-cell, whereas its dysfunction promotes diabetes. The associated paradox related to ?-cell efficiency is that excessive accumulation of fat in adipose tissue predisposes for type 2 diabetes. Insulin exocytosis is regulated by intracellular metabolic signal transduction, with glutamate dehydrogenase playing a key role in the amplification of the secretory response. Here, we used mice with ?-cell-selective glutamate dehydrogenase deletion (?Glud1?/?), lacking an amplifying pathway of insulin secretion. As opposed to control mice, ?Glud1?/? animals fed a high calorie diet maintained glucose tolerance and did not develop diet-induced obesity. Islets of ?Glud1?/? mice did not increase their secretory response upon high calorie feeding, as did islets of control mice. Inhibited adipose tissue expansion observed in knock-out mice correlated with lower expression of genes responsible for adipogenesis. Rather than being efficiently stored, lipids were consumed at a higher rate in ?Glud1?/? mice compared with controls, in particular during food intake periods. These results show that reduced ?-cell function prior to high calorie feeding prevented diet-induced obesity.