KCNQ5 activation by tannins mediates vasorelaxant effects of barks used in Native American botanical medicine
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Tree and shrub barks have been used as folk medicine by numerous cultures across the globe for millennia, for a variety of indications, including as vasorelaxants and antispasmodics. Here, using electrophysiology and myography, we discovered that the KCNQ5 voltage-gated potassium channel mediates vascular smooth muscle relaxant effects of barks used in Native American folk medicine. Bark extracts (1%) from Birch, Cramp Bark, Slippery Elm, White Oak, Red Willow, White Willow, and Wild Cherry each strongly activated KCNQ5 expressed in Xenopus oocytes. Testing of a subset including both the most and the least efficacious extracts revealed that Red Willow, White Willow, and White Oak KCNQ-dependently relaxed rat mesenteric arteries; in contrast, Black Haw bark neither activated KCNQ5 nor induced vasorelaxation. Two compounds common to the active barks (gallic acid and tannic acid) had similarly potent and efficacious effects on both KCNQ5 activation and vascular relaxation, and this together with KCNQ5 modulation by other tannins provides a molecular basis for smooth muscle relaxation effects of Native American folk medicine bark extracts.
| Originalsprog | Engelsk |
|---|---|
| Artikelnummer | e22457 |
| Tidsskrift | FASEB Journal |
| Vol/bind | 36 |
| Udgave nummer | 9 |
| Antal sider | 15 |
| ISSN | 0892-6638 |
| DOI | |
| Status | Udgivet - 2022 |
Bibliografisk note
(Ekstern)
Funding Information:
This study was supported by the National Institutes of Health, National Institute of General Medical Sciences (GM130377) and a Samueli Scholarship from the University of California, Irvine, Susan Samueli Integrative Health Institute to GWA, the National Institute of Neurological Disorders and Stroke (T32NS045540) to KR, the Lundbeck Foundation (R323-2018-3674) to TAJ, and JH received funding from the European Union's Horizon 2020 Research and Innovation Program under the Marie Skłodowska-Curie grant agreement No. 801199.
Funding Information:
This study was supported by the National Institutes of Health, National Institute of General Medical Sciences (GM130377) and a Samueli Scholarship from the University of California, Irvine, Susan Samueli Integrative Health Institute to GWA, the National Institute of Neurological Disorders and Stroke (T32NS045540) to KR, the Lundbeck Foundation (R323‐2018‐3674) to TAJ, and JH received funding from the European Union's Horizon 2020 Research and Innovation Program under the Marie Skłodowska‐Curie grant agreement No. 801199.
Publisher Copyright:
© 2022 Federation of American Societies for Experimental Biology.
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