Summary
We have studied the role of α1A and α1B-adrenoceptors in noradrenaline- and methoxamine-stimulated inositol phosphate accumulation in rat renal cortical slices. [3H]Prazosin binding studies with and without inactivation of α1B-adrenoceptors by chloroethylclonidine treatment suggested that noradrenaline lacks relevant selectivity for α1-adrenoceptor subtypes. Both agonists stimulated [3H]inositol phosphate accumulation with similar maximal effects. The α1A-selective antagonists 5-methyl-urapidil and (+)-niguldipine inhibited inositol phosphate formation by both agonists with shallow biphasic curves but the high affinity component was only 15%–31% and 38%–41%, respectively. The irreversible α1B-selective antagonist chloroethylclonidine inhibited inositol phosphate generation by both agonists by 54%–57%. In contrast to our previous data in rat cerebral cortical slices; we conclude that in rat renal cortex both α1A- and α1B-adrenoceptors are involved in noradrenaline-and methoxamine-stimulated inositol phosphate generation.
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Michel, M.C., Büscher, R., Philipp, T. et al. α1A and α1B-adrenoceptors enhance inositol phosphate generation in rat renal cortex. Naunyn-Schmiedeberg's Arch Pharmacol 347, 180–185 (1993). https://doi.org/10.1007/BF00169264
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DOI: https://doi.org/10.1007/BF00169264