Journal
OBESITY
Volume 21, Issue 12, Pages 2545-2556Publisher
WILEY
DOI: 10.1002/oby.20402
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Funding
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo FAPESP
- Conselho Nacional de Pesquisa (CNPq)
- Instituto Nacional de Ciencia e Tecnologia (INCT) - Obesidade e Diabetes
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Objective It has become clear that exercise may be a useful therapy in the insulin resistance treatment, as it has anti-inflammatory effects and improves insulin sensitivity. However, it remains uncertain whether exercise affects the adipocytes or infiltrated macrophages. Thus, the aim was to investigate the effects of acute exercise on the inflammatory status and insulin signaling of the white adipose tissue (WAT) fractions (stromal-vascular fraction [SVF] and adipocytes). Design and Methods The effect of acute swimming exercise was investigated on insulin sensitivity, insulin signaling, inflammatory pathways in the WAT fractions of high-fat fed Wistar rats. Additionally, macrophage infiltration and polarization were analyzed in the WAT. Results Acute exercise can improve insulin signaling in WAT fractions, along with a phenotypic switch from M1- to M2-macrophages in obese rats, as indicated by a marked increase in macrophage galactose-type C-type lectin 1-positive cells in WAT was observed. Additionally, exercise promoted a reduction in circulating levels of lipopolysaccharide, and toll-like receptor 4 activity along with TNF-alpha, IL-1-beta and MCP-1 mRNA levels in WAT fractions. Conclusions These data suggest that acute exercise improves insulin signaling in the WAT, at least in part by inducing macrophage polarization toward the M2-state.
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