Obesity, insulin resistance and diabetes in the sand rat exposed to a hypercaloric diet; possible protective effect for IL1-β

Comptes rendus biologies
Ali KhalkhalYasmina Dahmani

Abstract

It is well established that, upon changing their natural desert low caloric (succulent halophilic plants) to a regular laboratory high caloric diet, sand rats undergo various phenotypic changes depending on their genetic background and including obesity and various degrees of insulin resistance. Our aim was to investigate the acute effects of Interleukin-1β (IL-1β) and Interferon-γ (IFN-γ) on glucose-induced insulin secretion in normal lean sand rats maintained on their natural diet and in obese insulin resistant normoglycemic or type 2 diabetic animals after a 9-month high caloric diet. Animals were fed either a low or a high caloric diet; after 9 months, pancreatic islets were isolated and incubated in the presence of increasing cytokine concentrations. At the end of the high-energy diet, animals were all over-weight, and probably due to a different genetic background, they displayed either insulin resistance, hyperinsulinemia and normoglycemia or a marked type-2 diabetic state. Pancreatic islets from obese insulin resistant normoglycemic animals were much more sensitive and responsive to IL-1β when compared to lean controls. The cytokine was inefficient in diabetic islets. In conclusion, the markedly increased insulinotropic...Continue Reading

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Citations

Dec 28, 2012·American Journal of Physiology. Endocrinology and Metabolism·Jianping Ye, Owen P McGuinness
Aug 10, 2013·Chronobiology International·Orly Barak, Noga Kronfeld-Schor
Apr 4, 2014·Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association·R C S BarcelosM E Bürger
Oct 6, 2020·Frontiers in Microbiology·Ruokun YiXin Zhao

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