PMID: 6407506Jun 1, 1983Paper

Ultrastructural and biochemical observations on the effect of 4-hydroxyanisole plus tyrosinase on normal human melanocytes and keratocytes in tissue culture

British Journal of Cancer
A BreathnachM Nazzaro-Porro

Abstract

Cultures of melanocytes and keratocytes were exposed to 15 micrograms ml-1 tyrosinase and 4-hydroxyanisole (4-OHA) 5 X 10(-4) M to 5 X 10(-2) M for 1 to 24 h. No damage was suffered by either cell below 5 X 10(-3) M 4-OHA for 6 h, but higher concentrations and longer exposures extensively damaged both cells. Exposure of cells washed free of culture medium to tyrosinase and 4-OHA 1 X 10(-3) M for 1 h resulted also in extensive damage. This indicates that an early-formed toxic product of the reaction between tyrosinase and 4-OHA is inactivated by constituents of the medium. This was confirmed by Liquid Chromatography and Scanning Spectrophotometry which showed that a toxic 4-OHA quinone immediately reacted with nucleophilic substances in the medium resulting in products which, on accumulation, are probably responsible for the later (6 h plus) damage to melanocytes and keratocytes. A possible effect of allegedly specific melanocytotoxic drugs on keratocytes should always be borne in mind with tissue culture experiments.

Citations

Jan 1, 1991·Free Radical Research Communications·S PassiM Nazzaro-Porro
Jan 1, 1989·Toxicologic Pathology·K M Walsh, A W Gough
Dec 17, 1985·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·P A Riley
Feb 15, 1987·Biochemical Pharmacology·M PicardoP Riley
Jan 1, 1991·European Journal of Cancer : Official Journal for European Organization for Research and Treatment of Cancer (EORTC) [and] European Association for Cancer Research (EACR)·C D SchillerP Jheeta
Dec 1, 1988·European Journal of Cancer & Clinical Oncology·A J ThodyG V Sherbet

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