Regulation of prostatic smooth muscle contractility by intracellular second messengers: implications for the conservative treatment of benign prostatic hyperplasia

Urologia Internationalis
R E EckertM Ziegler

Abstract

The increased sympathetic neurotransmission in benign prostatic hyperplasia (BPH) results in a alpha 1C-adrenoceptor-mediated increase in prostatic smooth muscle tone which seems to be responsible for the dynamic infravesical obstruction occurring in BPH. The prostatic smooth muscle contractions evoked by norepinephrine can be efficiently blocked by alpha 1-adrenoceptor blockers. Moreover, an impressive number of clinical trials illustrated the beneficial results of alpha 1-adrenoceptor blockers in the treatment of BPH. However, despite knowledge of alpha 1-adrenergic neurotransmission and the clinical application of its blockade by selective alpha 1-adrenoceptor antagonists, very little is known about the intracellular pathways involved in the regulation of prostatic smooth muscle contractility. To study the intracellular mechanism of the alpha 1C-adrenoceptor-induced prostatic smooth muscle contraction, the patch-clamp technique in the whole-cell configuration mode combined with the Fura-II fluorescence technique was used in human, enzymatically isolated smooth muscle cells obtained from patients undergoing transurethral resection of the prostate because of symptomatic BPH. Furthermore changes in prostatic smooth muscle contr...Continue Reading

Citations

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