Abstract

Retinoids, which are derivatives of vitamin A, have a variety of effects on normal cellular differentiation and on the process of carcinogenesis. A number of novel endogenous retinol metabolites have been identified recently. The response of many cell types to retinoid treatment is mediated by retinoid receptors, and involves changes in gene expression, cell growth and cell differentiation. The gene encoding one of the retinoic acid receptors is disrupted by the chromosome translocations associated with acute promyelocytic leukemia, and the expression of another is altered in epithelial tumors; both of these findings have important implications for the use of retinoids as anti-carcinogenic agents. It has been demonstrated recently that certain homeobox genes are regulated by retinoids; these genes may also prove to be useful agents for anti-carcinogenic therapies.

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