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Research ArticleArticle

Functional Evidence for an Angiotensin IV Receptor in Rat Resistance Arteries

Laurent Loufrani, Daniel Henrion, Dominique Chansel, Raymond Ardaillou and Bernard I. Levy
Journal of Pharmacology and Experimental Therapeutics November 1999, 291 (2) 583-588;
Laurent Loufrani
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Daniel Henrion
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Dominique Chansel
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Raymond Ardaillou
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Bernard I. Levy
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Abstract

To distinguish between the different effects of angiotensin IV (Ang IV) on resistance artery vasoreactivity, freshly isolated rat mesenteric arteries were perfused and the changes in their diameter were recorded under various conditions. Ang IV exerted vasoconstrictor effects on both normal vessels and vessels that had been precontracted with phenylephrine or serotonin. This effect was abolished by losartan or candesartan cilexetil, two type 1 angiotensin receptor antagonists, but not by PD 123319, a type 2 angiotensin receptor antagonist. No tachyphylaxis was observed for the vasoconstrictor effect of Ang IV.NG-nitro-l-arginine methyl ester, a nitric oxide synthase inhibitor, had no effect on Ang IV-induced vasoconstriction, whereas indomethacin, a cyclooxygenase inhibitor that was inactive by itself, influenced Ang IV-induced vasoconstriction, suggesting that Ang IV could stimulate the release of prostaglandins. Treatment of preconstricted vessels by candesartan cilexetil unraveled a vasodilator effect of Ang IV that was abolished by PD 123319, a type 2 angiotensin receptor antagonist. Unexpectedly, Ang IV still produced a vasoconstrictor effect on normal or preconstricted vessels after blockade of both type 1 and type 2 angiotensin receptors. Taken together, these results show that Ang IV influences resistance artery vasoreactivity via different mechanisms, one of which implicates a functionally active type 4 angiotensin receptor.

Footnotes

  • Send reprint requests to: Dr. Raymond Ardaillou, INSERM U 489, Hôpital Tenon, 4, rue de la Chine, 75020 Paris, France. E-mail: raymond.ardaillou{at}tnn.ap-hop-paris.fr

  • ↵1 This work was financially supported by the Institut National de la Santé et de la Recherche Médicale.

  • Abbreviations:
    Ang
    angiotensin
    AT1
    type 1 angiotensin receptor
    AT4
    type 4 angiotensin receptor
    L-NAME
    NG-nitro-l-arginine methyl ester
    AT2
    type 2 angiotensin receptor
    • Received February 3, 1999.
    • Accepted July 8, 1999.
  • The American Society for Pharmacology and Experimental Therapeutics
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Journal of Pharmacology and Experimental Therapeutics: 291 (2)
Journal of Pharmacology and Experimental Therapeutics
Vol. 291, Issue 2
1 Nov 1999
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Research ArticleArticle

Functional Evidence for an Angiotensin IV Receptor in Rat Resistance Arteries

Laurent Loufrani, Daniel Henrion, Dominique Chansel, Raymond Ardaillou and Bernard I. Levy
Journal of Pharmacology and Experimental Therapeutics November 1, 1999, 291 (2) 583-588;

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Research ArticleArticle

Functional Evidence for an Angiotensin IV Receptor in Rat Resistance Arteries

Laurent Loufrani, Daniel Henrion, Dominique Chansel, Raymond Ardaillou and Bernard I. Levy
Journal of Pharmacology and Experimental Therapeutics November 1, 1999, 291 (2) 583-588;
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