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• W2024404276 endingPage "1331" @default.
• W2024404276 startingPage "1323" @default.
• W2024404276 abstract "The subtypes of α1-adrenoceptor mediating contractions of rat vas deferens to endogenous and exogenous noradrenaline and to the exogenous agonists methoxamine, phenylephrine and A61603 have been examined. The effects of antagonists on the shape of concentration-response curves, both tonic and phasic, to the four agonists were analysed. Prazosin produced parallel shifts in all cases. Particularly for RS 17053 against noradrenaline, there was some evidence for a resistant component of the agonist response. High concentrations of RS 17053 (1–10 μM) virtually abolished tonic contractions but phasic contractions were resistant. A series of nine antagonists (the above and WB4101, benoxathian, phentolamine, BMY 7378, HV 723, spiperone) were investigated against contractions to noradrenaline. The correlation with the potency of the series of α1-adrenoceptor antagonists against contractions to noradrenaline was significant only for the α1A-adrenoceptor ligand binding site (r=0.88, n=9, P<0.01). In epididymal portions (nifedipine 10 μM), the isometric contraction to a single electrical pulse is α1-adrenoceptor mediated. The correlation with ligand binding sites for 11 antagonists (the above plus ARC 239 and (+)-niguldipine) was significant only for the α1D-adrenoceptor subtype (r=0.65, n=11, P<0.05). In conclusion, tonic contractions of rat vas deferens produced by exogenous agonists are mediated predominantly by α1A-adrenoceptors, although a second subtype of receptor may additionally be involved in phasic contractions. Nerve-stimulation evoked α1-adrenoceptor mediated contractions seem to predominantly involve non-α1A-adrenoceptors, and the receptor involved resembles the α1D-receptor. British Journal of Pharmacology (1999) 128, 1323–1331; doi:10.1038/sj.bjp.0702913" @default.
• W2024404276 created "2016-06-24" @default.
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• W2024404276 date "1999-11-01" @default.
• W2024404276 modified "2023-10-17" @default.
• W2024404276 title "Investigation of the subtypes of α₁-adrenoceptor mediating contractions of rat vas deferens" @default.
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• W2024404276 doi "https://doi.org/10.1038/sj.bjp.0702913" @default.
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