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Update on human alpha1-adrenoceptor subtype signaling and genomic organization.

Alpha1-adrenoceptors are G-protein-coupled receptors that bind catecholamines. Sixteen distinct human alpha1A-adrenoceptor isoforms have been identified from human tissues, including five full-length and 11 truncated versions. An updated scheme for the identification of alpha1A-adrenoceptor splice variants is proposed. Given the established roles of alpha1-adrenoceptors in benign prostatic hyperplasia, myocardial hypertrophy and other cardiovascular disorders, elucidation of the biological significance of the signaling diversity and potential pharmacological roles of alpha1A-adrenoceptor splice variants are important areas of future research.