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    Differential effects of resveratrol on the dilator responses of femoral arteries, ex vivo

    Azzawi, May ORCID logoORCID: https://orcid.org/0000-0001-6238-9777, Diaz, Miguel and Degens, Hans ORCID logoORCID: https://orcid.org/0000-0001-7399-4841 (2019) Differential effects of resveratrol on the dilator responses of femoral arteries, ex vivo. Nitric Oxide: Biology and Chemistry, 92. pp. 1-10. ISSN 1089-8603

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    Resveratrol is a plant-derived phytoalexin with antioxidant, anti-inflammatory and cardio-protective properties and may be a promising therapeutic intervention strategy in cardiovascular disease. Here, we investigated the acute direct effects of trans-resveratrol (RV), on acetylcholine (ACh)-induced and flow-mediated dilation (FMD) of isolated pressurized femoral arteries of young (4-month-old) and old (26-month-old) mice. Vessel exposure to RV enhanced ACh (0.01- 1.0 mM)-induced dilation (p<0.05), but not FMD (@ 5-10 Lmin-1) (p<0.05) in both young and old mice. After RV incubation, acute nitric oxide (NO) production by cultured endothelial cells was increased in response to 0.01 mM ACh, but reduced by flow (5-10 Lmin-1; p<0.05). In isolated femoral arteries from endothelial nitric oxide synthase knockout (eNOS-/-) mice, RV had no overall effect on flow mediated dilation, but potentiated ACh induced dilation, that was completely abolished by potassium channel blockers, Apamin and Tram 34 (p<0.01). We demonstrate that the non-metabolised form of RV stimulates ACh-induced dilation via the NO and EDHF pathways, but not FMD by interaction with the cyclo-oxygenase pathway. Our findings have important implications in the use of RV (for both young and aged) under ‘normal’ non-diseased physiological states.

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