title: Detection of alpha 1-adrenoceptor subtypes in human hypertrophied prostate by in situ hybridization.
abstract: Adrenergic stimulation induces contraction of hypertrophied prostatic tissue via the alpha 1 adrenoceptor, and the results of pharmacological studies suggested the existence of adrenoceptor subtypes. Recently three subtypes (alpha 1a, alpha 1b, and alpha 1d) were cloned. Using probes for these subtypes, we demonstrated their expression in the tissues of ten cases of benign prostatic hypertrophy, using in situ hybridization. To determine the ratio between these subtypes, an RNase protection assay was also performed in three cases. Expression of the alpha 1a and alpha 1d adrenoceptors was diffuse in the smooth muscles of the interstitium, but was absent in glandular epithelial cells. On the contrary, the alpha 1b adrenoceptor was hardly detectable. The RNase protection assay confirmed the absence of the alpha 1b adrenoceptor, the ratio of alpha 1a and alpha 1d being 4:1. These results supported the idea that the differences in prostatic contractile response to several adrenergic drugs are based on the affinities of these drugs for the different subtypes.
authors: Department of Urology, Faculty of Medicine, University of Tokyo, Japan.
authors: N
authors: N
authors: Moriyama
authors: S
authors: S
authors: Kurimoto
authors: S
authors: S
authors: Horie
authors: K
authors: K
authors: Nasu
authors: T
authors: T
authors: Tanaka
authors: K
authors: K
authors: Yano
authors: H
authors: H
authors: Hirano
authors: G
authors: G
authors: Tsujimoto
authors: K
authors: K
authors: Kawabe
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015152:Blotting, Northern; D015342:DNA Probes / Q000378:metabolism; D004076:Digoxigenin; D006801:Humans; D017403:In Situ Hybridization; D008297:Male; D011470:Prostatic Hyperplasia / Q000473:pathology*; D015347:RNA Probes / Q000378:metabolism; D016372:RNA, Antisense / Q000378:metabolism; D011942:Receptors, Adrenergic, alpha / Q000032:analysis*; D012260:Ribonucleases / Q000378:metabolism
chemical_list: D015342:DNA Probes; D015347:RNA Probes; D016372:RNA, Antisense; D011942:Receptors, Adrenergic, alpha; D012260:Ribonucleases; D004076:Digoxigenin