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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
REVIEW
Mechanisms and clinical relevance of androgens and androgen receptor actions.
Chang Gung Medical Journal 2003 June
Androgens, principally testosterone and 5alpha-dihydrotestosterone, affect a number of diverse responses in a variety of peripheral target tissues. Their biological actions are mediated by a ligand-dependent nuclear transcription factor, the androgen receptor (AR). The AR is a member of the steroid hormone receptor family, which is found in a variety of tissues, and changes throughout development, aging, and malignant transformation. Recently, cloning and characterization of several AR co-regulators have allowed for cellular and molecular analysis of many different aspects of androgen physiology and pathophysiology. The transcriptional activity of AR is regulated by AR co-regulators, which influence the ligand selectivity and DNA binding capacity of AR. Aberrant co-regulator function due to mutation or altered expression levels may be a contributing factor in the progression of AR-mediated diseases. However, in spite of the intensity of research activity in this area, many interesting questions regarding the fundamental mechanism of AR and co-regulators on androgen-related diseases, such as osteoporosis and androgen insensitive syndrome remain unsolved. In this review, we provide a brief overview of genomic and non-genomic androgens/AR actions, as well as the regulation of their co-regulators. We also explore several intriguing aspects of the molecular biology of AR and co-regulators that are related to clinical diseases.
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