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• W2004131441 endingPage "1460" @default.
• W2004131441 startingPage "1454" @default.
• W2004131441 abstract "The prostate function is regulated by androgens and α-adrenergic activity. Clinically, antiandrogens and/or α1-adrenergic antagonists are commonly used to treat symptomatic prostatic hypertrophy. To elucidate the effects of androgen deprivation on prostate contractility via α1-adrenoceptor, the characteristics and expression of α1-adrenoceptors were examined in castrated rats. Isolated prostate strips from intact and castrated rats were subjected to a phenylephrine stimulated contraction. Prazosin (10 nM), [3H]-prazosin and phenoxybenzamine (3–300 nM) were used for inhibition assay, receptor characterization and partial alkylation of α-adrenoceptor, respectively. The mRNA content of three subtypes of α-adrenoceptors was determined by reverse transcription combined with polymerase chain reaction (RT–PCR). Contractile response to phenylephrine increased in castrated rats, which could be explained by a relative increase of the stromal component. A lowered contraction potency was also noted in castrated rats. Receptor binding assay indicated minimal changes in the affinity or density of α1-adrenoceptor. Escalating alkylation of the α1-adrenoceptor population resulted in a rightward shift in the contraction-response curves before depressing maximal contractile force, and the suppression was detected at lower doses in castrated rats. RT–PCR study confirmed the expression of three types of α1-adrenoceptor, α1a, α1b and α1d-adrenoceptors, in intact rat prostate, and revealed that α1a-adrenoceptor, but not α1b or α1d-adrenoceptors, was down-regulated in castrates. The results show that androgen deprivation suppressed α1-adrenergic contractility of rat prostate strips, and the suppression was associated with down-regulation of receptor reserve for the α1a-adreneroceptor population expressed in intact rat prostate. British Journal of Pharmacology (2000) 131, 1454–1460; doi:10.1038/sj.bjp.0703706" @default.
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• W2004131441 date "2000-12-01" @default.
• W2004131441 modified "2023-09-23" @default.
• W2004131441 title "Effects of castration on contraction and α1-adrenoceptor expression in rat prostate" @default.
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• W2004131441 doi "https://doi.org/10.1038/sj.bjp.0703706" @default.
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