Chromium malate alleviates high-glucose and insulin resistance in L6 skeletal muscle cells by regulating glucose uptake and insulin sensitivity signaling pathways
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Previous study revealed that chromium malate improved the regulation of fasting blood glucose and insulin resistance in type 2 diabetic rats. In this study, the effect of chromium malate on anti-high-glucose and improve insulin resistance activities in L6 skeletal muscle cells with insulin resistance and its acting mechanism were investigated. Chromium malate showed direct anti-high-glucose activity in vitro. The glucose levels had a significant downward trend compared to chromium trichloride. Compared with model group, chromium malate could significantly promote the secretion levels of GLUT-4, Akt, Irs-1, PPARγ, PI3K and p38-MAPK, promote AMPKβ1 phosphorylation, and reduced the level of p-Irs-1 in L6 cells with insulin resistance. And the relate mRNA expression of chromium malate was significantly increased. Chromium malate is more effective at improving the related proteins and mRNA expression than those of chromium trichloride and chromium picolinate. Pretreatment with the specific p38MAPK inhibitor completely inhibited the GLUT-4 and Irs-1 proteins and mRNA expression induced by the chromium malate when compared with model group, but GLUT-4 and Irs-1 proteins and mRNA expression was partially inhibited after inhibiting p38MAPK/PI3K expression. The results suggested that chromium malate had a beneficial influence on the improvement of controlling glucose levels and insulin resistance in L6 cells with insulin resistance by regulating proteins production and genes expression in glucose uptake and insulin sensitivity signaling pathways.
KeywordsChromium malate Insulin resistance Glucose uptake Signaling pathway
This work was supported by the Specialized Research Fund for the Natural Science Foundation of China (Grant Numbers 31271850) and Research Foundation for Advanced Talents of Jiangsu University (Grant Numbers 15JDG146).
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Conflict of interest
The authors declare that there are no competing interests.
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