Natural Product Sciences

The Korean Society of Pharmacognosy (한국생약학회)
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Inhibition of Tyrosine Hydroxylase by $(1R,9S)-{\beta}-Hydrastine$ Hydrochloride in PC12 cells

  • Yin, Shou-Yu (College of Pharmacy, Yanbian University) ;
  • Kim, Yu-Mi (College of Pharmacy, and Research Center for Bioresource and Health, Chungbuk National University) ;
  • Lee, Jae-Joon (College of Pharmacy, and Research Center for Bioresource and Health, Chungbuk National University) ;
  • Jin, Chun-Mei (College of Pharmacy, and Research Center for Bioresource and Health, Chungbuk National University) ;
  • Yang, Yoo-Jung (College of Pharmacy, and Research Center for Bioresource and Health, Chungbuk National University) ;
  • Lim, Kyo-Whan (College of Pharmacy, and Research Center for Bioresource and Health, Chungbuk National University) ;
  • Kang, Min-Hee (College of Pharmacy, and Research Center for Bioresource and Health, Chungbuk National University) ;
  • Lee, Myung-Koo (College of Pharmacy, and Research Center for Bioresource and Health, Chungbuk National University)
  • Published : 2004.06.30
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Abstract

It is reported that $(1R,9S)-{\beta}-Hydrastine$ hydrochloride (BHSH) decreased the intracellular dopamine content by inhibiting tyrosine hydroxylase (TH) activity in PC12 cells. In this study, the inhibitory mechanisms on TH activity by BHSH in PC12 cells were investigated. BHSH treatment caused a reduction of TH activity and TH mRNA level in a dose-dependent manner. After the treatment of $20\;{\mu}M$ BHSH, TH activity and TH mRNA content were reduced at 15 min, reached the minimal levels at 6-24 h, and then recovered gradually to the control level. BHSH at $10-50\;{\mu}M$ caused a decrease in the basal intracellular cyclic AMP levels at 10 min in a concentration-dependent manner. In addition, BHSH at $20-100\;{\mu}M$ decreased the basal intracellular $Ca^{2+}$ concentration $([Ca^{2+}]_i)$ immediately in a dose-dependent manner. BHSH also inhibited the 56 mM $K^+ $ depolarization-induced elevation in $[Ca^{2+}]_i$, and blocked caffeine-activated store-operated $Ca^{2+}$ entry in PC12 cells. These data suggest that BHSH inhibits TH activity and TH gene expression, in part, through reducing cyclic AMP content and basal $[Ca^{2+}]_i$ in PC12 cells.

Keywords

References

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