Evaluation of Diabetogenic Mechanism of High Fat Diet in Combination with Arsenic Exposure in Male Mice

Obesity is a main reason of type 2 diabetes and also chronic exposure to arsenic (As)can produce diabetic symptoms. In previous studies, the association between high-fat dietand arsenic in the incidence of diabetes was found, but the role of beta cells activity, livermitochondrial oxidative stress, and hepatic enzymes (leptin, adiponectin and beta amylase)was unclear. Thus, present study was conducted to evaluate the diabetogenic mechanism ofarsenic followed by concomitant administration of high-fat diet (HFD) in male mice. In thisexperimental study, the mice consumed with HFD or low-fat diet (LFD) while exposed toAs 25 or 50 ppm in drinking water for 20 weeks. At the end of experiments, hyperglycemia,insulin resistance variables, lipid profile, hepatic enzymes, liver mitochondrial oxidative stress,islet insulin secretion, liver, and pancreas histopathology were evaluated in all mice by theirown methods. Control HFD fed mice showed a significant increase in FBG, OGTT, HOMAIR,ITT, lipid profile, leptin, β-amylase, liver mitochondrial oxidative stress, hepatic enzymesand decreased FPI, HOMA-β, adiponectin, and islet insulin secretion or content. However,exposure to HFD concomitant with Arsenic revealed an impressive reduction in FBG, FPI,HOMA-IR, HOMA-β, ITT, lipid profile, and islet insulin secretion or content. This exposureenhanced OGTT, leptin, adiponectin, liver mitochondrial oxidative stress, and hepatic enzymes.In conclusion, HFD and arsenic concomitant administration induced impairment of OGTT andislet insulin secretion or content through the mitochondrial oxidative stress.