Role of retinoids in differentiation and carcinogenesis.

It has been known for more than 50 years that retinoids, the family of molecules comprising both the natural and synthetic analogues of retinol, are potent agents for control of both cellular differentiation and cellular proliferation (70). In their original clas sic paper describing the cellular effects of vitamin A deficiency in the rat, Wolbach and Howe clearly noted that there were distinct effects on both differentiation and proliferation of epithelial cells. During vitamin A deficiency, it was found that proper differentia tion of stem cells into mature epithelial cells failed to occur and that abnormal cellular differentiation, characterized in particular by excessive accumulation of keratin, was a frequent event. Furthermore, it was noted that there was excessive cellular proliferation in many of the deficient epithelia. Although the conclusion that an adequate level of retinoid was necessary for control of normal cellular differentiation and proliferation was clearly stated in the original paper by Wolbach and Howe, a satisfactory explanation of the molecular mechanisms underlying these effects on both differentiation and proliferation still eludes us more than 50 years later. It was inevitable that the basic role of retinoids in control of cell differentiation and proliferation would eventually find practical application in the cancer field, and there have been great ad vances in this area, particularly for prevention of cancer. Many studies have shown that retinoids can suppress the process of carcinogenesis in vivo in experimental animals (for reviews, see Refs. 7, 33, 51, 54, 56, and 57), and these results are now the basis of current attempts to use retinoids for cancer prevention in humans. Furthermore, there is now an extensive literature on the ability of retinoids to suppress the development of the malignant phenotype in vitro (for reviews, see Refs. 6, 8, 30, and 31 ), and these studies corroborate the use of retinoids for cancer prevention. Finally, most recently, it has been shown that reti noids can exert effects on certain fully transformed, invasive, neoplastic cells, leading in certain instances to a suppression of proliferation (30) and in other instances to terminal differentiation of these cells, resulting in a more benign, nonneoplastic pheno type (10,11,60,62). Even though there are many types of tumor cells for which this is not the case (33, 52) (indeed, at present there are only a limited number of instances in which such profound effects of retinoids on differentiation and proliferation of invasive tumor cells have been shown), this finding neverthe less has highly significant implications for the problem of cancer treatment. It emphasizes that in many respects cancer is fun damentally a disease of abnormal cell differentiation (36,44), and it raises the possibility that even invasive disease may eventually be controlled by agents which control cell differentiation rather than kill cells. Since carcinogenesis is essentially a disorder of cell differentiation, the overall scientific problem of the role of retinoids in either differentiation or carcinogenesis is essentially

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