Ceramide is Involved in $MPP^+-induced$ Cytotoxicity in Human Neuroblastoma Cells

  • Nam, Eun-Joo (Department of Pharmacology, Seoul National University College of Medicine and Neuroscience Research Institute, Medical Research Center) ;
  • Lee, Hye-Sook (Department of Pharmacology, Seoul National University College of Medicine and Neuroscience Research Institute, Medical Research Center) ;
  • Lee, Young-Jae (Neuroscience Research Institute, Gachon Medical School) ;
  • Joo, Wan-Seok (Department of Pharmacology, Seoul National University College of Medicine and Neuroscience Research Institute, Medical Research Center) ;
  • Maeng, Sung-Ho (Department of Pharmacology, Seoul National University College of Medicine and Neuroscience Research Institute, Medical Research Center) ;
  • Im, Hye-In (Department of Pharmacology, Seoul National University College of Medicine and Neuroscience Research Institute, Medical Research Center) ;
  • Park, Chan-Woong (Department of Pharmacology, Seoul National University College of Medicine and Neuroscience Research Institute, Medical Research Center) ;
  • Kim, Yong-Sik (Department of Pharmacology, Seoul National University College of Medicine and Neuroscience Research Institute, Medical Research Center)
  • Published : 2002.12.21

Abstract

To understand the cytotoxic mechanism of $MPP^+,$ we examined the involvement of ceramide in $MPP^+-induced$ cytotoxicity to human neuroblastoma SH-SY5Y cells. When SH-SY5Y cells were exposed to $MPP^+,\;MPP^+$ induced dose-dependent cytotoxicity accompanied by 2-fold elevation of intracellular ceramide levels in SH-SY5Y cells. Three methods were used to test the hypothesis that the elevated intracellular ceramide is related to $MPP^+-induced$ cytotoxicity: $C_2-ceramide$ was directly applied to cells, sphingomyelinase (SMase) was exogenously added, and oleoylethanolamine (OE) was used to inhibit degradation of ceramide. Furthermore, inhibition of ceramide-activated protein phosphatase (CAPP), the effector of ceramide, using okadaic acid (OA) attenuated cell death but treatment of fumonisin $B_1,$ the ceramide synthase inhibitor, did not alter the cytotoxic effect of $MPP^+.$ Based on these, we suggest that the elevation of intracellular ceramide is one of the important mediators in $MPP^+-induced$ cell death.

Keywords

References

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