Abstract
In the current study, the involvement of calpain, a cysteine proteinase in the regulation of melanogenesis was examined using mouse B16 melanoma cells. In response to α-melanocyte-stimulating hormone (α-MSH), B16 melanoma cells underwent differentiation characterized by increased melanin biosynthesis. The total calapain activity was decreased within 2 h following α-MSH-treatment, and restored to the initial level in 6–12 h. To further investigate the involvement of calpain in the regulation of melanogenesis, the effect of calpain inhibitors on α-MSH-induced melanogenesis was examined. Inhibition of calpain by either N-acetyl-Leu-Leu-norleucinal (ALLN) or calpastatin (CS) peptide blocked α-MSH-induced melanogenesis. The magnitude of inhibition of melanin biosynthesis was well correlated with a decrease in the activity of tyrosinase, a key regulatory enzyme in melanogenesis. Treatment of B16 cells with ALLN caused marked decrease in both tyrosinase protein and mRNA levels. These results indicate that calpain would be involved in the melanogenic signaling by modulating the expression of tyrosinase in mouse B16melanoma cells.
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Ohguchi, K., Akao, Y. & Nozawa, Y. Involvement of calpain in melanogenesis of mouse B16 melanoma cells. Mol Cell Biochem 275, 103–107 (2005). https://doi.org/10.1007/s11010-005-1081-0
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DOI: https://doi.org/10.1007/s11010-005-1081-0