Endothelium-independent and calcium channel-dependent relaxation of the porcine cerebral artery by different species and strains of turmeric

10.1016/j.jtcme.2018.08.002

Jesmin Akter；Md Zahorul Islam；Md Amzad Hossain；Shinsuke Kawabata；Kensaku Takara；Ha Thi Thanh Nguyen；De-Xing Hou；Atsushi Miyamoto

Turmeric ； Cerebral artery ； Vasorelaxation ； Ca^(2+)-channel ； β-adrenergic receptor

Journal of Traditional and Complementary Medicine

9卷4期（2019 / 10 / 01）

297 - 303

英文

Objective: To clarify the underlying mechanism of turmeric, which is traditionally used as a medicinal plant for the treatment of cardiovascular disorders, such as hypertension, and palpitations. Methods: Methanol extracts of different turmeric were used. A tissue-organ-bath system was used to investigate the vasoactive effects of methanol extracts from 5 kinds of turmeric on isolated porcine basilar arteries. The arterial rings were suspended in physiological solution that was maintained at 37 °C temperature with a continuous supply of 95% O_2 and 5% CO_2. Results: All turmeric extracts (20-800 μg/mL) induced concentration-dependent relaxation of the isolated porcine basilar artery pre-contracted with U46619 (1-5×10^(-9)M) in arterial rings with or without endothelium. There were no significant differences in the relaxation induced by different turmeric or between the endothelium-intact and denuded arteries. In depolarized, Ca^(2+)-free medium, the turmeric extracts inhibited CaCl_2-induced contractions and caused a concentration-dependent rightward shift of the response curves. In addition, propranolol (a non-specific β-adrenoceptor antagonist) slightly inhibited the relaxation induced by turmeric. In contrast, Nω-nitro-_L-arginine, indomethacin, tetraethylammonium, glibenclamide and 4-aminopyridine did not affect turmeric-induced relaxation. Conclusion: These results demonstrated that turmeric induced endothelium-independent relaxation of the porcine basilar artery, which may be due to the inhibition of extracellular and intracellular Ca^(2+) receptors and the partial inhibition of β-adrenergic receptors in vascular smooth muscle cells.

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