Differences in macrophage polarization in the adipose tissue of obese mice under various levels of exercise intensity
Tóm tắt
Animal studies have demonstrated that the ratio of M1 (M1Φ) to M2 (M2Φ) macrophage-specific gene expression in adipose tissue (AT) may be altered by chronic exercise; however, whether macrophage polarization is induced under these conditions has not yet been reported. Therefore, this study aimed to investigate the effect of chronic exercise on M1Φ/M2Φ polarization in the AT of high-fat diet (HFD)-induced obese mice. Exercise-induced differences in M1Φ/M2Φ polarization were verified via an exercise intensity study (EIS) in which different levels of exercise intensity were evaluated. Obesity was induced in male C57BL/6 J mice by feeding them with an HFD for 6 weeks. The study consisted of four groups: control group (CON), HFD-fed group (HFD), HFD-fed with exercise group (HFD + EXE), dietary conversion from HFD to normal diet (ND) group (DC), and dietary conversion from HFD to ND group (DC + EXE). For EIS, the HFD + EXE group was divided into three subgroups: low- (LI), mid- (MI), and high- (HI) intensity exercise. The total intervention period was 8 weeks. M1Φ/M2Φ polarization was confirmed by flow cytometry. M2Φ polarization in the AT of obese mice was significantly higher in HFD + EXE mice than in HFD mice, despite the HFD intake. In the EIS, M2Φ polarization was most pronounced in HFD + EXE-HI mice than in HFD mice. It can be proposed that the enhanced insulin resistance and inflammation by obesity can be improved by the increase of M2Φ polarization which is achieved by relatively high-intensity exercise.
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