@misc{oai:repo.qst.go.jp:00068703, author = {Hirobe, Tomohisa and Wakamatsu, Kazumasa and Ito, Shosuke and 廣部 知久}, month = {Sep}, note = {The murine recessive yellow (Mc1re) is a loss-of-function mutation in the receptor for alpha-melanocyte-stimulating hormone (MSH), melanocortin receptor 1 (MC1R), and produces yellow coats by inducing pheomelanin synthesis in hair follicular melanocytes. However, it is not known whether Mc1re mutation affects pheomelanin synthesis in other skin sites. The eumelanin contents in the epidermis and dermis of newborn wild-type (Mc1r+/Mc1r+) mice (0.5, 3.5, 5.5 and 7.5 days) were much greater than those of mutant (Mc1re/Mc1re) mice, whereas the pheomelanin contents in the epidermis and dermis of mutant mice were much greater than those of wild-type mice. No sex differences in the contents of eumelanin and pheomalanin in the epidermis and dermis both in mutant and wild-type mice were observed. The eumelanin contents in mutant hairs (5-week-old) was much smaller than in wild-type hairs, whereas the pheomelanin contents in mutant hairs was much greater than in wild-type hairs. However, the eumelanin and pheomelanin contents in mutant female hairs were greater than in male. These sex differences were not observed in wild-type mice. These results suggest that the Mc1re gene stimulates pheomelanin synthesis in the epidermis, dermis and hair follicles. In addition, Mc1re gene may affect eumelanin and pheomelanin contents in hairs by influencing through sex-related mechanisms., 13th meeting of the European Society for Pigment Cell Research}, title = {The eumelanin and pheomelanin contents in dorsal hairs of female recessive yellow mice are greater than in male}, year = {2006} }