The Korean Journal of Physiology and Pharmacology

The Korean Society of Pharmacology (대한약리학회)
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Glycyrrhizin Attenuates MPTP Neurotoxicity in Mouse and $MPP^+$-Induced Cell Death in PC12 Cells

  • Kim, Yun-Jeong (Department of Pharmacology, College of Medicine, Chung-Ang University) ;
  • Lee, Chung-Soo (Department of Pharmacology, College of Medicine, Chung-Ang University)
  • Published : 2008.04.30
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Abstract

The present study examined the inhibitory effect of licorice compounds glycyrrhizin and a metabolite $18{\beta}$-glycyrrhetinic acid on the neurotoxicity of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) in the mouse and on the 1-methyl-4-phenylpyridinium ($MPP^+$)-induced cell death in differentiated PC12 cells. MPTP treatment increased the activities of total superoxide dismutase, catalase and glutathione peroxidase and the levels of malondialdehyde and carbonyls in the brain compared to control mouse brain. Co-administration of glycyrrhizin (16.8 mg/kg) attenuated the MPTP effect on the enzyme activities and formation of tissue peroxidation products. In vitro assay, licorice compounds attenuated the $MPP^+$-induced cell death and caspase-3 activation in PC12 cells. Glycyrrhizin up to $100{\mu}M$ significantly attenuated the toxicity of $MPP^+$. Meanwhile, $18{\beta}$-glycyrrhetinic acid showed a maximum inhibitory effect at $10{\mu}M$; beyond this concentration the inhibitory effect declined. Glycyrrhizin and $18{\beta}$-glycyrrhetinic acid attenuated the hydrogen peroxide- or nitrogen species-induced cell death. Results from this study indicate that glycyrrhizin may attenuate brain tissue damage in mice treated with MPTP through inhibitory effect on oxidative tissue damage. Glycyrrhizin and $18{\beta}$-glycyrrhetinic acid may reduce the $MPP^+$ toxicity in PC12 cells by suppressing caspase-3 activation. The effect seems to be ascribed to the antioxidant effect.

Keywords

References

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