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WASEDA'S REGIMEN |
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WASEDA'S COMPREHENSIVE
ANALYSIS ON HAIR LOSS
(3) J Invest Dermatol 2001 Sep;117(3):605-11 Cyclosporin a promotes hair epithelial cell proliferation and modulates protein kinase c expression and translocation in hair epithelial cells. Takahashi T, Kamimura
A. Tsukuba Research
Laboratories, Kyowa Hakko Kogyo Co., Tsukuba, Ibaraki, Japan. Cyclosporin A is an immunosuppressive agent known to cause hirsutism. The mechanisms of action that cause hirsutism have not been fully elucidated, however. We have previously reported that several selective protein kinase C inhibitors promote the growth of murine hair epithelial cells and stimulate anagen induction. In this paper, we report on an investigation of the mechanisms of action of hair-growing activity possessed by cyclosporin A from the viewpoint of whether it promotes hair epithelial cell growth or whether it modulates the expression or translocation of protein kinase C isozymes in hair epithelial cells. Our results indicate that cyclosporin A (over a wide dosage range of 1-1000 ng per ml) stimulates cultured murine hair epithelial cell growth to about 150%-160% relative to controls. We also observed growth-promoting effects on murine epidermal keratinocytes (about 140%) at the dose range of 1-100 ng per ml. At high dose ranges above 3 &mgr;g per ml, the growth of both cells was inhibited. On the other hand, we found that cyclosporin A reduces the overall expression of protein kinase C alpha, betaI, and betaII in cultured murine hair epithelial cells, and reduces the levels of protein kinase C alpha, betaI, betaII, and eta in the particulate fraction from cultured murine hair epithelial cells. From these results, we speculate that the hair-growing activity of cyclosporin A is at least partially attributable to its growth-promoting influence on hair epithelial cells sequential to its downregulation of some protein kinase C isozymes in hair epithelial cells or inhibition of translocation of some protein kinase C isozymes to the membrane or cytoskeleton of hair epithelial cells. PMID: 11564166
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