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자료유형
학술저널
저자정보
저널정보
한국운동생리학회 운동과학 운동과학 제27권 제1호
발행연도
2018.1
수록면
32 - 39 (8page)

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PURPOSE: This study investigated the effect of exercise intensity on hepatic microRNA (miRNA) expression in a high-fat diet (HFD)- induced obese mice. METHODS: A total of 40 male C57BL/6 mice aged 5 weeks were randomly subjected to either standard chow (SC, n=10) or HFD (HFD, n=30) for 23 weeks. After 8 weeks of dietary treatments, mice in the HFD group were further divided and subjected to either HFD only (n=10) or HFD with high-intensity interval treadmill running (HFD+INT, n=10) or HFD with moderate-intensity treadmill running (HFD+MOD) for additional 15 weeks. Hepatic total RNA was extracted to analyze global expression profiles of miRNAs, which was followed by real-time PCR to quantify hepatic expressions of up or down-regulated miRNAs and mRNAs. RESULTS: As expected, chronic exposure to HFD resulted in obesity and hepatic steatosis in conjunction with increased serum concentrations of total cholesterol, aspartate transaminase, and alanine transaminase. In addition, HFD resulted in upregulation of hepatic miR-149 and miR-34a levels in conjunction with downregulation of hepatic peroxisome proliferator-activated receptor alpha (PPAR-α) and sirtuin1 (SIRT1) mRNAs. On the other hand, exercise training, especially high-intensity interval training, attenuated the liver damage and total cholesterol in conjunction with downregulation of hepatic miR-149 and miR-34a levels and upregulation of hepatic PPAR-α and SIRT1 mRNAs. CONCLUSIONS: This study suggests that exercise training, especially performed at a high-intensity, was effective in attenuating HFDinduced- fatty liver phenotypes as well as HFD–induced dysregulation of miRNAs in the liver.

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