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Am J Physiol Heart Circ Physiol 282: H475-H481, 2002. First published October 18, 2001; doi:10.1152/ajpheart.00411.2001
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Vol. 282, Issue 2, H475-H481, February 2002

Modulatory role of a constitutively active population of alpha 1D-adrenoceptors in conductance arteries

Khalid Ziani, Regina Gisbert, Maria Antonia Noguera, Maria Dolores Ivorra, and Pilar D'Ocon

Departamento de Farmacología, Facultad de Farmacia, Universitat de València, 46100 Burjassot, Valencia, Spain

A constitutively active population of alpha 1D-adrenoceptors in iliac and proximal, distal, and small mesenteric rat arteries was studied. The increase in resting tone (IRT) that evidences it was observed only in iliac and proximal mesenteric and was inhibited by prazosin (pIC50 = 9.57), 5-methylurapidil (pIC50 = 7.61), and BMY 7378 (pIC50 = 8.77). Chloroethylchlonidine (100 µmol/l) did not affect IRT, but when added before the other antagonists it blocked their effect. The potency shown by BMY 7378 confirms the alpha 1D-subtype as responsible for IRT. BMY 7378 displayed greater inhibition of adrenergic responses in iliac (pIC50 = 7.57 ± 0.11) and proximal mesenteric arteries (pIC50 = 8.05 ± 0.2) than in distal (pIC50 = 6.94 ± 0.13) or small mesenteric arteries (pIC50 = 6.30 ± 0.14), which confirms the functional role of the alpha 1D-adrenoceptor in iliac and proximal mesenteric arteries. This subtype prevents abrupt changes in iliac and proximal mesenteric artery caliber when the agonist disappears, and this modulatory role is evidenced by the slower decay in the response to norepinephrine after removal.

conductance vessels; resistance vessels; constitutive activity; alpha 1D-adrenoceptors


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