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The FASEB Journal, Vol 7, 427-436, Copyright © 1993 by The Federation of American Societies for Experimental Biology

REVIEWS

Control of gene expression by lipophilic hormones

RR Reichel and ST Jacob
Department of Pharmacology and Molecular Biology, Chicago Medical School, Illinois 60064.

Regulation of gene expression in response to steroids, thyroid hormone, and retinoids is mediated by an impressive array of intracellular receptors. Sequence analysis showed that the hormone receptors comprise a large superfamily of ligand-responsive transcription factors. Upon binding to hormones, the receptors interact with specific hormone response elements located in the promoters of numerous genes. Promoter- bound receptors communicate with distinct receptors and/or additional members of the transcriptional machinery, frequently evoking protein- protein interactions. Ultimately, this results in the induction of complex gene systems that control hormone-induced processes such as differentiation, cell growth, and homeostasis. In addition to the genes transcribed by RNA polymerase II, the lipophilic hormones, particularly glucocorticoids, can also modulate RNA polymerase I-directed transcription of the ribosomal gene. For both transcription systems, activation and repression of genes in response to hormones have been reported. Finally, the involvement of hormone receptors in tumorigenesis has been discussed. It is likely that receptor studies will have major implications in the diagnosis and therapy of diseases such as leukemia.


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Copyright © 1993 by The Federation of American Societies for Experimental Biology.