Effects of aerobic exercise on the inflammatory cytokine profile and expression of lipolytic and thermogenic genes in β1-AR-/- mice adipose tissue

Abstract

Aim: Investigate the effects of moderate continuous aerobic exercise (MCAE) on the inflammatory cytokine profile and expression of lipolytic and thermogenic genes in β₁-AR^-/- mice adipose tissue.

Main methods: Four- to five-month-old male wild type (WT) and β₁-AR^-/- mice were divided into groups: WT control (WTc) and trained (WTt); and β₁-AR^-/- control (β₁-AR^-/-c) and trained (β₁-AR^-/-t). Animals from trained groups were submitted to a MCAE regimen (60 min/day; 60% of maximal speed, 5 days/week) on a treadmill, for 8 weeks. After euthanasia, white epididymal (eWAT) and inguinal (iWAT) and brown (BAT) adipose tissues were dissected and used to determine: adiposity index; adipocyte histomorphometry; cytokine concentration; and gene expression. The content of fat, protein and water of the empty carcass was determined.

Key findings: MCAE reduced body weight, fat mass as well as iWAT and BAT adipocyte area in β₁-AR^-/- animals. Aerobic exercise also diminished the concentrations of pro-inflammatory (IL-12p70, TNF-α, IL-6) and anti-inflammatory (IL-10) cytokines in adipose tissue (iWAT, eWAT or BAT) of β₁-AR^-/- mice. However, MCAE had no effect on the expression lipolytic and thermogenic genes in β₁-AR^-/- mice adipose tissue.

Significance: Alongside reductions in body weight, fat mass and adipocyte area eight weeks of MCAE improves the profile of inflammatory cytokines in β₁-AR^-/- mice adipose tissue, despite no change in Lipolytic and thermogenic gene expression.

Keywords: Adipocyte; Inflammatory cytokines; Lipolytic genes; Moderate exercise.