Abstract
Calcium-activated chloride channels (CaCCs) play vital roles in a variety of physiological processes. Dysfunction of the CaCCs is implicated in many diseases. Drug discovery targeting at CaCCs has recently become possible with the determination that TMEM16A is the molecular identity of CaCCs. In this study, we demonstrated that resveratrol (RES), a Chinese traditional medicine compound, is a novel activator of TMEM16A. The yellow fluorescence protein quenching assay and measurement of intracellular calcium fluorescence intensity show that RES activates TMEM16A channels in an intracellular Ca2+-independent way. The data of inside-out patch clamp revealed that RES dose-dependently activates TMEM16A (EC50 = 47.92 ± 9.35 μM). Furthermore, RES enhanced the contractions of the ileum of guinea pigs by activating the TMEM16A channel, which indicated that RES might be a promising drug for the treatment of gastrointestinal hypomotility. As RES was able to induce TMEM16A channel activation, TMEM16A can be added to the list of RES drug targets.
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Acknowledgements
This work was supported by the National Natural Science Fund of China (11475053 to YZ, Grant No. 11247010 to HA, 31400711 to YC), the Fund for Outstanding Talents of Hebei Province of China (Grant No. C201400305 to HA), and the Natural Science Fund for Distinguished Young Scholars of the Hebei Province of China (Grant No. C2015202340 to HA).
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Chai, R., Chen, Y., Yuan, H. et al. Identification of Resveratrol, an Herbal Compound, as an Activator of the Calcium-Activated Chloride Channel, TMEM16A. J Membrane Biol 250, 483–492 (2017). https://doi.org/10.1007/s00232-017-9975-9
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DOI: https://doi.org/10.1007/s00232-017-9975-9