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Kaempferol enhances endothelium-independent and dependent relaxation in the porcine coronary artery

Molecular and Cellular Biochemistry volume 287, Article number: 61 (2006) Cite this article

Abstract

The vascular effects of kaempferol were investigated in isolated porcine coronary artery rings. U46619 (9,11-dideoxy-9α, 11α-methanoepoxy prostaglandin F2α, 30 nM) was used to contract porcine coronary arterial rings. Concentration relaxation curve of kaempferol (1 nM – 100 μM) was constructed and kaempferol demonstrated significant relaxation at high concentrations. At low concentration with no significant effect on relaxation, kaempferol (10 μM) enhanced relaxation produced by bradykinin, the calcium ionophore A23187, isoproterenol and sodium nitroprusside in endothelium-intact porcine coronary arteries. In endothelium-disrupt rings, kaempferol (10 μM) also enhanced the relaxation caused by isoproterenol, sodium nitroprusside, levcromakalim and nifedipine. On the other hand, antioxidant agents did not affect bradykinin-induced relaxation or the enhancement effect of kaempferol. In summary, a low concentration of kaempferol (10 μM), devoid of significant vascular effect, has the ability to enhance endothelium-dependent and endothelium-independent relaxations. This action of kaempferol is unrelated to its antioxidant property.

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Affiliations

  1. Department of Pharmacology, Faculty of Medicine, The University of Hong Kong, Hong Kong, SAR, China

    Y. C. Xu, D. K. Y. Yeung, R. Y. K. Man & S. W. S. Leung

  2. 2/F Laboratory Block, Faculty of Medicine Building, 21 Sassoon Road, Hong Kong, SAR, China

    S. W. S. Leung

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  1. Y. C. Xu
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  2. D. K. Y. Yeung
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  3. R. Y. K. Man
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  4. S. W. S. Leung
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Correspondence to S. W. S. Leung.

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Xu, Y.C., Yeung, D.K.Y., Man, R.Y.K. et al. Kaempferol enhances endothelium-independent and dependent relaxation in the porcine coronary artery. Mol Cell Biochem 287, 61 (2006). https://doi.org/10.1007/s11010-005-9061-y

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  • DOI: https://doi.org/10.1007/s11010-005-9061-y

Key words

  • antioxidant
  • flavonoid
  • kaempferol
  • relaxation
  • smooth muscle