Exercise promotes peripheral glycolysis through miR-204 induction in skeletal muscle
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ABSTRACT: Mechanisms underlying exercise induced insulin sensitization are of interest as exercise is a clinically critical option as a lifestyle intervention for diabetic patients. Some of microRNAs (miRNAs), which can be secreted from skeletal muscle after exercise, regulate insulin sensitivity and are used for diagnostic marker for diabetic patients. MiR-204 is well-known for its involvement in development, cancer, and metabolism. However, it is still unknown whether miR-204 associates with exerciseinduced glycemic control. In preliminary data, we found that endurance exercise of mice increases miR-204 expression levels in skeletal muscle. In chronic exercise mice model, miR-204 expression levels were increased with glycolytic enzymes in skeletal muscle. When hypoxia induced hypoxia inducible factor 1 alpha (HIF1α), miR-204 expression levels were increased. HIF1α overexpression also increased miR-204 expression levels. To corroborate the causality between miR-204 and glycolysis, miR-204 mimic was introduced to myoblast cell line, C2C12 myoblast cell line. After exposure to miR-204 mimic, C2C12 cells could increase the glycolysis rate measured by extracellular acidification rate. miR-204 mimics also increased mRNA expression levels of glycolytic enzymes. In vivo intravenous miR-204 administration to mice also increased the glucose clearance rate after refeeding of mice. MiR-204 increased blood glucose surge on earlier point of refeeding but promoted the blood glucose lowering on later point of refeeding. Skeletal muscle glycolytic enzymes were increased in mRNA expression levels by miR-204 injection. This finding suggests the novel physiological role of miR-204 in skeletal muscle glycolysis where insulin action is limited.
ORGANISM(S): Mus musculus
PROVIDER: GSE276372 | GEO | 2024/09/04
REPOSITORIES: GEO
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