title: Effect of ACTH and corticosterone on melanogenesis and cyclic nucleotide levels in the B-16 melanoma.
abstract: The acute in vitro action of ACTH and corticosterone individually and in combination were determined in the B-16 melanoma grown in vivo. ACTH elevated levels 10-fold while tyrosinase activity generally was depressed. Corticosterone depressed cAMP levels and tyrosinase activity. ACTH in the presence of corticosterone produced a coincident peak in tyrosinase activity and cAMP levels followed by a depression of enzymatic activity. The results demonstrate that cAMP is not the sole modulator of tyrosinase activity and that ACTH, corticosterone and cAMP interact in the regulation of B-16 melanoma tyrosinase activity.
mesh_terms: D000324:Adrenocorticotropic Hormone / Q000494:pharmacology*; D000818:Animals; D003345:Corticosterone / Q000494:pharmacology*; D000242:Cyclic AMP / Q000378:metabolism; D006152:Cyclic GMP / Q000378:metabolism; D066298:In Vitro Techniques; D008543:Melanins / Q000096:biosynthesis*; D008545:Melanoma / Q000378:metabolism*; D051379:Mice; D014442:Monophenol Monooxygenase / Q000378:metabolism; D009374:Neoplasms, Experimental / Q000378:metabolism
chemical_list: D008543:Melanins; D000324:Adrenocorticotropic Hormone; D000242:Cyclic AMP; D014442:Monophenol Monooxygenase; D006152:Cyclic GMP; D003345:Corticosterone