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pubmed-article:2547477pubmed:abstractText1. The postjunctional alpha-adrenoceptors mediating contractions in the isolated vascular bed of the perfused rat tail have been investigated, in the presence and absence of an increase in perfusion pressure by arginine vasopressin (AVP). 2. In the absence of AVP, bolus doses of noradrenaline (NA) and phenylephrine produced pressor responses of similar time course, while UK-14,304 was practically inactive. Responses to noradrenaline were inhibited more by 0.05 microM prazosin than by 1 microM rauwolscine, suggesting the presence of alpha1-adrenoceptors. 3. Following a sustained elevation in perfusion pressure by AVP, both UK-14,304 and NA (the latter in the presence of 0.05 microM prazosin to inhibit alpha 1-adrenoceptors) elicited dose-dependent pressor responses. The maximum response to UK-14,304 under these conditions was approximately 30% of the maximum response to NA in the absence of prazosin and AVP. Responses to phenylephrine were not affected by the AVP-induced increase in vascular tone. 4. In the presence of AVP, pressor responses to UK-14,304 were resistant to 0.05 microM prazosin and susceptible to antagonism by 1 microM rauwolscine (-log Kb 7.65 +/- 0.15). Similarly, responses to NA in the presence of 0.05 microM prazosin and AVP were inhibited by 1 microM rauwolscine. This represents the first demonstration of prazosin-resistant, rauwolscine-sensitive alpha 2-adrenoceptor-mediated responses in the vasculature of the rat tail. 5. These results suggest that in isolated vascular preparations, functional populations of postjunctional alpha 2-adrenoceptors may be 'uncovered' by the presence of AVP.lld:pubmed
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pubmed-article:2547477pubmed:articleTitleEvidence for prazosin-resistant, rauwolscine-sensitive alpha-adrenoceptors mediating contractions in the isolated vascular bed of the rat tail.lld:pubmed
pubmed-article:2547477pubmed:affiliationInstitute of Physiology, University of Glasgow, Scotland.lld:pubmed
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