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pubmed-article:2072865pubmed:abstractTextIn order to examine the possibility of an interaction between adenosine and angiotensin II (A II) in the control of the renal microcirculation, we studied the effects of agonists and antagonists of both substances by means of in vivo microscopy in the split hydronephrotic rat kidney. In a first series of experiments (n = 6), local application of the A II receptor antagonist saralasin (10(-6) mol.liter-1 abolished the vasoconstriction and the reduction of glomerular blood flow induced by the A1-adenosine receptor agonist N6-cyclohexyladenosine (CHA, local concentration 10(-7) mol.liter-1). Without saralasin (second series, n = 6), CHA reduced glomerular blood flow and decreased vessel diameters as previously reported from our laboratory. In a third series of experiments (n = 6), A II significantly reduced vessel diameters and glomerular blood flow both alone and during blockage of the A1-adenosine receptor by the selective antagonist 1,3-dipropyl-8-cyclopentylxanthine (DPCPX, 10(-5) mol.liter-1). In additional experiments, we excluded nonspecific receptor effects of saralasin and confirmed the inhibitory action of DPCPX on the adenosine-induced vasoconstriction. We suppose that adenosine needs a functioning A II receptor system for its vasoconstrictor action, whereas A II can induce a nonadenosine-dependent vasoconstriction.lld:pubmed
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pubmed-article:2072865pubmed:articleTitleInteraction between adenosine and angiotensin II in renal microcirculation.lld:pubmed
pubmed-article:2072865pubmed:affiliationFirst Institute of Physiology, University of Heidelberg, Federal Republic of Germany.lld:pubmed
pubmed-article:2072865pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:2072865pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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