Long-term in vivo polychlorinated biphenyl 126 exposure induces oxidative stress and alters proteomic profile on islets of Langerhans

Sci Rep. 2016 Jun 13;6:27882. doi: 10.1038/srep27882.

Abstract

It has been recently proposed that exposure to polychlorinated biphenyls (PCBs) is a risk factor to type 2 diabetes mellitus (DM2). We investigated this hypothesis using long-term in vivo PCB126 exposure to rats addressing metabolic, cellular and proteomic parameters. Male Wistar rats were exposed to PCB126 (0.1, 1 or 10 μg/kg of body weight/day; for 15 days) or vehicle by intranasal instillation. Systemic alterations were quantified by body weight, insulin and glucose tolerance, and blood biochemical profile. Pancreatic toxicity was measured by inflammatory parameters, cell viability and cycle, free radical generation, and proteomic profile on islets of Langerhans. In vivo PCB126 exposure enhanced the body weight gain, impaired insulin sensitivity, reduced adipose tissue deposit, and elevated serum triglycerides, cholesterol, and insulin levels. Inflammatory parameters in the pancreas and cell morphology, viability and cycle were not altered in islets of Langerhans. Nevertheless, in vivo PCB126 exposure increased free radical generation and modified the expression of proteins related to oxidative stress on islets of Langerhans, which are indicative of early β-cell failure. Data herein obtained show that long-term in vivo PCB126 exposure through intranasal route induced alterations on islets of Langerhans related to early end points of DM2.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adipose Tissue / metabolism
  • Administration, Intranasal
  • Animals
  • Body Weight / drug effects
  • Cell Survival / drug effects
  • Cholesterol / blood
  • Glucose / metabolism
  • Insulin / blood
  • Islets of Langerhans / cytology
  • Islets of Langerhans / drug effects*
  • Islets of Langerhans / metabolism
  • Kidney / drug effects
  • Kidney / metabolism
  • Lipid Metabolism / drug effects
  • Liver / drug effects
  • Liver / metabolism
  • Male
  • Nitric Oxide / metabolism
  • Oxidative Stress / drug effects*
  • Polychlorinated Biphenyls / toxicity*
  • Proteome / drug effects*
  • Rats
  • Rats, Wistar
  • Triglycerides / blood
  • Up-Regulation / drug effects

Substances

  • Insulin
  • Proteome
  • Triglycerides
  • Nitric Oxide
  • Cholesterol
  • Polychlorinated Biphenyls
  • Glucose
  • 3,4,5,3',4'-pentachlorobiphenyl