中文摘要：

内皮素（endothelin,ET）及其受体在黑色素细胞成熟分化时起着有效的促进作用.然而,内皮素-2（ET-2）在黑色素生成的作用方面,还处于争论中或报道不一致.在此,我们研究ET-2对体外培养的绵羊皮肤黑色素细胞增殖和黑色素生成的影响.比较实验组ET-2（1,10,100 nmol/L）与空白对照组,通过MTT法和Ando等的方法检测出黑色素细胞的增殖率和黑色素含量显著增加.荧光定量PCR和Western印迹分别检测出内皮素受体B（Bdnrb）;酪氨酸激酶受体（Kit）;酪氨酸酶（Tyr）;酪氨酸相关蛋白-1（Tyrp-1）基因的mRNA水平及蛋白水平的相对表达量显著增加.这些数据表明,ET-2可能促进绵羊的皮肤黑色素细胞增殖和黑色素生成.

英文摘要：

Endothelin（ ET） and its receptor have been shown to play roles in the melanocyte maturity.However,the reports on the function of ET-2 in melanogenesis are debated. Herein,we investigated the effect of ET-2 on ovine skin melanocyte proliferation and melanogenesis. MTT method and Ando methods showed that the cell proliferation rates and melanin levels were significantly increased in melanocytes treated by ET-2（ 1 to 100 nmol / L） compared with the control（ untreated） cells. Furthermore,real-time quantitative PCR and Western blotting revealed that the levels of both mRNA and protein of the Bdnrb,Tyr,Kit and Tyrp-1 genes were significantly increased. These data suggest that ET-2 might promote proliferation of ovine skin melanocytes and melanogenesis.