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    Analysis of the potentiating action of N(G)-nitro-L-arginine on the contraction of the dog temporal artery elicited by transmural stimulation of noradrenergic nerves.

    Source

    Department of Pharmacology, Shiga University of Medical Sciences, Ohtsu, Japan.

    Abstract

    Dog temporal artery strips without endothelium responded to transmural electrical stimulation with a contraction which was potentiated by NG-nitro-L-arginine (L-NNA). The noradrenaline-induced contraction and the release of 3H-noradrenaline were not affected. The stimulation-induced contraction was reversed to a relaxation by phentolamine. The relaxation was not influenced by timolol and atropine but inhibited by L-NNA; L-arginine abolished the inhibition. Transmural stimulation released NOx from the arteries, the release being abolished by L-NNA. Potentiation by L-NNA of the neurally-induced contraction appears to be due to elimination of NO produced by non-adrenergic, non-cholinergic vasodilator nerve activation.

    PMID:
    2067595
    [PubMed - indexed for MEDLINE]

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