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Resveratrol Inhibits $GABA_C$ ${\rho}$ Receptor-Mediated Ion Currents Expressed in Xenopus Oocytes

  • Lee, Byung-Hwan (Department of Physiology, College of Veterinary Medicine and Bio-Molecular Informatics Center, Konkuk University) ;
  • Choi, Sun-Hye (Department of Physiology, College of Veterinary Medicine and Bio-Molecular Informatics Center, Konkuk University) ;
  • Hwang, Sung-Hee (Department of Physiology, College of Veterinary Medicine and Bio-Molecular Informatics Center, Konkuk University) ;
  • Kim, Hyeon-Joong (Department of Physiology, College of Veterinary Medicine and Bio-Molecular Informatics Center, Konkuk University) ;
  • Lee, Joon-Hee (Department of Physical Therapy, Sehan University) ;
  • Nah, Seung-Yeol (Department of Physiology, College of Veterinary Medicine and Bio-Molecular Informatics Center, Konkuk University)
  • 투고 : 2013.01.16
  • 심사 : 2013.04.01
  • 발행 : 2013.04.30

초록

Resveratrol is a phytoalexin found in grapes, red wine, and berries. Resveratrol has been known to have many beneficial health effects, such as anti-cancer, neuroprotective, anti-inflammatory, and life-prolonging effects. However, relatively little is known about the effects of resveratrol on the regulation of ligand-gated ion channels. We have previously reported that resveratrol regulates subsets of homomeric ligand-gated ion channels such as those of 5-$HT_{3A}$ receptors. The ${\gamma}$-aminobutyric $acid_C$($GABA_C$) receptor is mainly expressed in retinal bipolar cells and plays an important role in visual processing. In the present study, we examined the effects of resveratrol on the channel activity of homomeric $GABA_C$ receptor expressed in Xenopus oocytes injected with cRNA encoding human $GABA_C$ ${\rho}$ subunits. Our data show that the application of GABA elicits an inward peak current ($I_{GABA}$) in oocytes that express the $GABA_C$ receptor. Resveratrol treatment had no effect on oocytes injected with $H_2O$ or with $GABA_C$ receptor cRNA. Co-treatment with resveratrol and GABA inhibited $I_{GABA}$ in oocytes with $GABA_C$ receptors. The inhibition of $I_{GABA}$ by resveratrol was in a reversible and concentration-dependent manner. The $IC_{50}$ of resveratrol was $28.9{\pm}2.8{\mu}M$ in oocytes expressing $GABA_C$ receptor. The inhibition of $I_{GABA}$ by resveratrol was in voltage-independent and non-competitive manner. These results indicate that resveratrol might regulate $GABA_C$ receptor expression and that this regulation might be one of the pharmacological actions of resveratrol on the nervous system.

키워드

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