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Tyrosinase in a melanosome is known to be inactivated during melanin formation in vivo, and a similar inactivation was observed in vitro when melanosomes isolated from Harding Passey mouse melanoma were incubated with dopa. Tyrosinase, whether particle bound or in soluble form, was inactivated during the dopa-tyrosinase reaction and the reduction rate of(More)
Maternal circadian information has been reported to play an important role in fetal physiology and development. Hormones and nutrition have been mainly investigated as circadian cues from mother to fetus. However, the influences of circadian properties of the pregnant reproductive organs on fetuses have not been fully investigated. To gain an insight on the(More)
It has been suggested that superoxide anion (O2-) may be produced during eumelanin formation and during the photoirradiation of eumelanin , but no direct evidence for this has yet been reported (although O2- production during photoirradiation of pheomelanin has been shown). In this report, the production of O2- was investigated during the formation and(More)
Ethanol precipitate (70-95%) of the water extract of mouse melanoma (ME) contains suppressors for melanocyte cell division. A fraction which had preferential melanocyte cell line suppressor activity (ME IV2) was shown to inhibit protein synthesis by cell-free systems and RNA synthesis by isolated nuclei of rat liver. The separation and some characterization(More)
The transfer of tyrosinase from microsomes into melanosomes, without passing through the cytosol in the Harding-Passey mouse melanoma cell, was confirmed by experiments carried out using a combination of radioisotope tracer techniques and immunoprecipitation. 3H-Labeled amino acid incorporation into tyrosinase present in the microsome, melanosome, and(More)
Two partially purified fractions of the ethanol precipitate (70-95%) of the water extract of Harding-Passey mouse melanoma, which inhibit protein and DNA syntheses of B-16 melanoma cells in culture, also inhibit protein synthesis in various cell-free systems. By examining their inhibitory effects on limited reactions of protein synthesis, it was found that(More)
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