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The metabolism of 1-naphthol, a model phenolic substrate, to its glucuronic acid and sulphate ester conjugates has been studied in short-term organ cultures of normal human colon and tumour tissue, subcellular fractions of these tissues, human colonic tumour cell lines and human colonic tumour xenografts. Normal colonic tissue, in short-term organ culture, formed more 1-naphthyl sulphate than glucuronic acid conjugates. In contrast the colonic tumours, under the same conditions, produced more 1-naphthyl beta-D-glucuronide than 1-naphthyl sulphate. A marked interindividual variation in sulphate ester and glucuronic acid conjugation was noted in both normal and tumorous colon. The conjugation of 1-naphthol was also investigated, using subcellular fractions, where the metabolism found with normal colon reflected that observed utilizing short-term organ culture, but that from colonic tumour samples did not. Cell lines derived from human colonic adenocarcinomas metabolised 1-naphthol almost exclusively to its glucuronic acid conjugate. Xenografts derived from human colonic tumours formed similar conjugates to surgical samples in culture. Thus somewhat different results were obtained dependent on the experimental model chosen. However, in all colonic tumour systems studied, when the cells remained intact and where tissue architecture was maintained, 1-naphthol was metabolised predominantly to its glucuronic acid conjugate.

Conjugation of 1-naphthol by human colon and tumour tissue using different experimental systems