Melanocyte stimulating hormone activation of tyrosinase in B16 mouse melanoma cells Evidence for a differential induction of two distinct isoenzymes

FEBS Letters

García-Borrón, J.C.¹  Solano, F.¹  Lozano, J.A.¹  Valverde, P.¹  Martínez-Liarte, J.H.¹ 

[1] Department of Biochemistry and Molecular Biology, School of Medicine, University of Murcia, Murcia, Spain

关键词: α-Melanocyte stimulating hormone;    Tyrosinase;    Isoenzyme;    Theophylline;    Melanogenesis;    Melanoma cell;    l-dopa;    l-3;    4-dihydroxyphenylalanine;    EDTA;    ethylenediaminetetraacetic acid;    αMSH;    α-melanocyte stimulating hormone;    PAGE;    polyacrylamide gel electrophoresis;    PMSF;    phenylmethylsulfonyl fluoride;    SDS;    sodium dodecyl sulfate;   

DOI  :  10.1016/0014-5793(92)80600-L

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Tyrosinase induction in murine malignant melanocytes by αMSH is well known, but its molecular basis has not been characterized. Treatment of B16 melanoma cells with theophylline or αMSH mediates a larger induction of tyrosine hydroxylase than of dopa oxidase activity in total cell extracts, and in the melanosomal and microsomal fractions. No evidence for the modulation of a tyrosinase effector was found. SDS-PAGE and specific activity stain demonstrated two forms of tyrosinase, with different degrees of induction by theophylline. These results agree with the recent proposal that two tyrosinases, encoded by different genes, are present in murine melanocytes.

【 授权许可】

Unknown