Abstract
The aim of this study was to evaluate the impact of three different chromium forms—chromic chloride (CrCl3), chromium picolinate (CrPic), and a newly synthesized complex of chromium chelated with small peptides (CrSP)—on protein metabolism in vitro. In cultured skeletal muscle cells, CrSP was able to increase the basal and insulin-stimulated levels of protein deposition in skeletal muscles cells. CrCl3 and CrPic augmented insulin-stimulated protein synthesis. At the molecular level, insulin significantly increased the mRNA levels of insulin-like growth factor 1 and insulin-like growth factor 1 receptor. These impacts could be enhanced by the addition of chromium, especially CrSP. The mRNA levels of ubiquitin were significantly reduced when cells were cultured with chromium or/and insulin. Assuming that the mRNA level increase or decrease results in increased or decreased levels of these proteins, chromium would improve protein anabolism and reduce protein catabolism and then prove protein deposition in rat skeletal muscle cells.
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This article was financially supported by the Program for Changjiang Scholars and Innovative Research Team in University, China, IRTO555.
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All authors listed have contributed to the work and have agreed to submit the manuscript to Biological Trace Element Research. The manuscript is original, has not been published before, and is not under consideration for publication elsewhere.
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Peng, Z., Qiao, W., Wang, Z. et al. Chromium Improves Protein Deposition Through Regulating the mRNA Levels of IGF-1, IGF-1R, and Ub in Rat Skeletal Muscle Cells. Biol Trace Elem Res 137, 226–234 (2010). https://doi.org/10.1007/s12011-009-8579-3
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DOI: https://doi.org/10.1007/s12011-009-8579-3