Serum profile of cytokines and their genetic variants in metabolic syndrome and healthy subjects: a comparative study

Biosci Rep. 2019 Feb 1;39(2):BSR20181202. doi: 10.1042/BSR20181202. Print 2019 Feb 28.

Abstract

To identify genetic variants in promoter areas of IL-6 -174 G>C and TNF-α -308 G>A in metabolic syndrome (Met S) and controls and associate them with Met S and serum cytokine levels.It was a cross-sectional study, including 224 cases of Met S and 200 controls. A fasting blood sample was taken and biochemical parameters including serum glucose, insulin, lipid profile, interleukin-6 (IL-6) and tumor necrosis factor α (TNF-α) were measured. Restriction fragment length polymorphism was used to identify the genetic variants of IL-6 and TNF-α. Serum levels of IL-6 and TNF-α and insulin resistance were significantly higher in cases than the controls. IL-6 showed significant positive correlation with HOMA-IR and TNF-α. CC genotype of IL-6 was associated with the increased risk of Met S (P=0.016, OR for CC vs GC+GG = 2.33, CI: 1.15-4.71). There was no significant difference of TNF-α genotypes between the cases and the controls. Serum TNF-α and IL-6 levels were significantly higher in AA and CC genotypes of TNF-α (-308 G>A) and IL-6 (-174 G>C) as compared with the GG (P=0.00 and P=0.001). Significant correlation of IL-6 with TNF-α and insulin resistance was observed that may provide us a therapeutic target for preventing metabolic derangements from insulin resistance.

Keywords: IL-6; Metabolic syndrome; TNF-α; insulin resistance.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Case-Control Studies
  • Cross-Sectional Studies
  • Female
  • Gene Expression
  • Gene Frequency
  • Humans
  • Insulin Resistance / genetics
  • Interleukin-6 / blood
  • Interleukin-6 / genetics*
  • Male
  • Metabolic Syndrome / blood*
  • Metabolic Syndrome / genetics*
  • Middle Aged
  • NF-kappa B / genetics
  • Polymorphism, Restriction Fragment Length
  • Polymorphism, Single Nucleotide*
  • Promoter Regions, Genetic
  • Tumor Necrosis Factor-alpha / blood
  • Tumor Necrosis Factor-alpha / genetics*

Substances

  • IL6 protein, human
  • Interleukin-6
  • NF-kappa B
  • TNF protein, human
  • Tumor Necrosis Factor-alpha