| First Author | Hirobe T | Year | 1998 |
| Journal | Eur J Cell Biol | Volume | 75 |
| Issue | 2 | Pages | 184-91 |
| PubMed ID | 9548375 | Mgi Jnum | J:46886 |
| Mgi Id | MGI:1202196 | Doi | 10.1016/S0171-9335(98)80060-5 |
| Citation | Hirobe T, et al. (1998) Effects of genic substitution at the agouti, brown, albino, dilute, and pink-eyed dilution loci on the proliferation and differentiation of mouse epidermal melanocytes in serum-free culture. Eur J Cell Biol 75(2):184-91 |
| abstractText | To examine the effects of coat-color genes on the proliferation and differentiation of mouse epidermal melanocytes, we cultured epidermal, cell suspensions derived from neonatal skins of C57BL/10JHir (black) and its congenic mice carrying agouti, brown, albino, dilute, and pink-eyed dilution genes in a serum-free medium supplemented with dibutyryl adenosine 3',5'-cyclic mono-phosphate. The proliferative rates of agouti, brown and dilute black melanocytes were similar to that of black melanocytes, while those of albino and pink-eyed black melanocytes were about one-half of that of black melanocytes. The morphology of albino and pink-eyed black melanocytes, though non-pigmented, was similar to black melanocytes; namely, dendritic, polygonal or epithelioid. Dilute black melanocytes also possessed the similar morphology, whereas their melanosomes were accumulated in the perinuclear region. Dopa-melanin depositions after dopa reaction in brown and dilute black melanocytes were greater than in black and agouti melanocytes. Although dopa-melanin depositions were not observed in albino melanocytes, about 8% of pink-eyed black melanocytes were positive to dopa reaction. Silver depositions after combined dopa- premelanin reaction in agouti, brown and dilute black melanocytes were similar to that in black melanocytes. Although albino melanocytes were devoid of silver depositions, about 25% of pink-eyed black melanocytes were positive to the reaction. Pyrrole-2,3,5-tricarboxylic acid (PTCA, degradation product of eumelanin) contents in agouti and dilute black melanocytes were slightly lower than in black melanocytes, while that in brown melanocytes was reduced to one-third. In contrast, PTCA contents in albino and pink-eyed black melanocytes were reduced to less than 0.5%. Aminohydroxy-phenylalanine (AHP, degradation product of pheomelanin) contents did not differ among these melanocytes. These results suggest that the coat-color genes exert their influences on the proliferation and differentiation of mouse epidermal melanocytes by affecting tyrosinase activity, melanosome maturation and transport, and eumelanin synthesis. |
