Effect of cymbopogon citratus and citral on vascular smooth muscle of the isolated thoracic rat aorta

Devi, R.C.; Sim, S.M.; Ismail, R. (2012) Effect of cymbopogon citratus and citral on vascular smooth muscle of the isolated thoracic rat aorta. Evidence-based Complementary and Alternative Medicine. ISSN 1741-427X

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    Abstract

    Cymbopogon citratus has been shown to have antioxidant, antimicrobial, antispasmodic and chemo-protective properties. Citral, is the major constituent of C. citratus. This study investigated the effects of methanolic extracts of leaves (LE), stems (SE), and roots (RE) of C. citratus and citral on vascular smooth muscle and explored their possible mechanisms of action. The experiment was conducted using isolated tissue preparations, where citral, LE, SE, and RE were added separately into a tissue bath that contained aortic rings, which were pre-contracted with phenylephrine (PE). Citral, LE, and RE exhibited a dose-dependent relaxant effect on the PE-induced contractions. Citral appeared to partially act via NO as its vasorelaxant effect was attenuated by L-NAME. However, the effect of LE may involve prostacyclin as indomethacin reversed the relaxant effect of LE on the PE-induced contraction. Furthermore, citral, LE, and RE abolished the restoration of PE-induced contraction caused by the addition of increasing doses of calcium in both endothelium intact and denuded rings. These findings suggest that the relaxation effect of citral, LE, and RE is endothelium-independent and may be mainly by affecting the intracellular concentration of calcium. Citral may partially act through the NO pathway while a vasodilator prostaglandin may mediate the effect of LE.

    Item Type: Article
    Creators:
    1. Devi, R.C.
    2. Sim, S.M.
    3. Ismail, R.
    Journal or Publication Title: Evidence-based Complementary and Alternative Medicine
    Additional Information: Department of Physiology, Faculty of Medicine, University of Malaya, Lembah Pantai, 50603 Kuala Lumpur, Malaysia and Department of Pharmacology, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
    Uncontrolled Keywords: Physiology
    Subjects: R Medicine
    Divisions: Faculty of Medicine
    Depositing User: Mr. Faizal Hamzah
    Date Deposited: 15 Jun 2012 09:47
    Last Modified: 11 Dec 2013 15:57
    URI: http://eprints.um.edu.my/id/eprint/3312

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