ADCY5 gene expression in adipose tissue is related to obesity in men and mice

PLoS One. 2015 Mar 20;10(3):e0120742. doi: 10.1371/journal.pone.0120742. eCollection 2015.

Abstract

Genome wide association studies revealed an association of the single nucleotide polymorphism rs11708067 within the ADCY5 gene--encoding adenylate cyclase 5--with increased type 2 diabetes (T2D) risk and higher fasting glucose. However, it remains unclear whether the association between ADCY5 variants and glycemic traits may involve adipose tissue (AT) related mechanisms. We therefore tested the hypothesis that ADCY5 mRNA expression in human and mouse AT is related to obesity, fat distribution, T2D in humans and high fat diet (HFD) in mice. We measured ADCY5 mRNA expression in paired samples of visceral and subcutaneous adipose tissue from 244 individuals with a wide range of body weight and parameters of hyperglycemia, which have been genotyped for rs11708067. In addition, AT ADCY5 mRNA was assessed in C57BL/6NTac which underwent a 10 weeks standard chow (n = 6) or high fat diet (HFD, n = 6). In humans, visceral ADCY5 expression is significantly higher in obese compared to lean individuals. ADCY5 expression correlates with BMI, body fat mass, circulating leptin, fat distribution, waist and hip circumference, but not with fasting plasma glucose and HbA1c. Adcy5 expression in mouse AT is significantly higher after a HFD compared to chow (p<0.05). Importantly, rs11708067 is not associated with ADCY5 mRNA expression levels in either fat depot in any of the genetic models tested. Our results suggest that changes in AT ADCY5 expression are related to obesity and fat distribution, but not with impaired glucose metabolism and T2D. However, altered ADCY5 expression in AT does not seem to be the mechanism underlying the association between rs11708067 and increased T2D risk.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adenylyl Cyclases / genetics*
  • Adenylyl Cyclases / metabolism
  • Adipose Tissue / enzymology*
  • Adiposity
  • Animals
  • Diet, High-Fat
  • Female
  • Gene Expression Regulation, Enzymologic*
  • Genetic Predisposition to Disease
  • Glucose / metabolism
  • Humans
  • Inflammation / genetics
  • Inflammation / pathology
  • Insulin / metabolism
  • Male
  • Mice, Inbred C57BL
  • Middle Aged
  • Obesity / enzymology*
  • Obesity / genetics*
  • Polymorphism, Single Nucleotide / genetics
  • Quantitative Trait, Heritable
  • RNA, Messenger / genetics
  • RNA, Messenger / metabolism

Substances

  • Insulin
  • RNA, Messenger
  • Adenylyl Cyclases
  • adenylyl cyclase type V
  • Glucose

Grants and funding

This work was supported by grants of Deutsche Diabetes Gesellschaft, Germany. This work was further supported by the Kompetenznetz Adipositas (Competence network for Obesity) funded by the Federal Ministry of Education and Research (German Obesity Biomaterial Bank; FKZ 01GI1128), a grant from Deutsche Forschungsgemeinschaft (Sonderforschungsbereich 1052 „Obesity Mechanisms“; projects B01 and B03), and by the Helmholtz Alliance ICEMED – Imaging and Curing Environmental Metabolic Diseases, through the Initiative and Networking Fund of the Helmholtz Association. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.