title: Intracellular distribution of dopa and 5-S-cysteinyldopa in Harding-Passey melanoma.
abstract: The concentrations of dopa and 5-S-cysteinyldopa were determined in the various cell fractions of Harding-Passey melanomas. Dopa was present in larger amounts than was 5-S-cysteinyldopa in all cell fractions, but the dopa/5-S-cysteinyldopa ratio was lower in the soluble fraction and in the small-granule fraction than in the large-granule fraction. The soluble fraction contained the greatest amount of catechols. These findings are compatible with high tyrosinase activity not only in the melanosomes but also in the small-granule and soluble fractions.
mesh_terms: D000818:Animals; D003548:Cysteinyldopa / Q000032:analysis*; D004295:Dihydroxyphenylalanine / Q000031:analogs & derivatives* / Q000032:analysis*; D008545:Melanoma / Q000032:analysis*; D051379:Mice; D008811:Mice, Inbred DBA; D009374:Neoplasms, Experimental / Q000032:analysis; D013347:Subcellular Fractions / Q000032:analysis
chemical_list: D003548:Cysteinyldopa; D004295:Dihydroxyphenylalanine