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Prunetin Relaxed Isolated Rat Aortic Rings by Blocking Calcium Channels

1
Department of Herbology, College of Korean Medicine, Kyung Hee University, Seoul 02447, Korea
2
Department of Herbology, Graduate School, Kyung Hee University, Seoul 02447, Korea
*
Author to whom correspondence should be addressed.
Molecules 2018, 23(9), 2372; https://doi.org/10.3390/molecules23092372
Received: 27 August 2018 / Revised: 14 September 2018 / Accepted: 14 September 2018 / Published: 17 September 2018
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Abstract

Prunetin, a component of herbal medicines and various foods, such as pea, peach, cherry, and Prunus yedoensis, is a useful pharmacological compound. We previously reported the potent vasorelaxant effect of the bark of P. yedoensis. Therefore, we investigated the vasorelaxant activities of prunetin on isolated rat aortic rings and hypotensive activity on spontaneously hypertensive rats (SHR) in this study. In the present study, prunetin (1–30 μg/mL) relaxed isolated rat aortic rings pre-contracted by phenylephrine (PE) in a concentration-dependent manner. Pre-incubation with prunetin (3 and 10 μg/mL) inhibited vasoconstriction induced by the supply of Ca2+ in rat aortic rings pre-contracted with PE or KCl in a Ca2+-free Krebs–Henseleit (KH) buffer. Prunetin (10 μg/mL) pre-treatment also inhibited caffeine-induced contraction of aortic rings in a Ca2+-free KH buffer. To investigate the hypotensive effect of prunetin, the systolic blood pressure (SBP) of the SHR was measured by using a tail cuff assay. The SBP of SHR was significantly lower in the prunetin (25 mg/kg)-treated group. These results suggested that prunetin decreased blood pressure and relaxed blood vessels by blocking receptor-operated calcium channels, voltage-dependent calcium channels, and ryanodine receptor channels. View Full-Text
Keywords: prunetin; hypertension; blood pressure; vasorelaxation; calcium channels prunetin; hypertension; blood pressure; vasorelaxation; calcium channels
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Kim, B.; Jo, C.; Choi, H.-Y.; Lee, K. Prunetin Relaxed Isolated Rat Aortic Rings by Blocking Calcium Channels. Molecules 2018, 23, 2372.

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