Enhancement of ATP-induced Currents by Phospholipase D1 Overexpressed in PC12 Cells

  • Park, Jin-Bong (Departments of Physiology, College of Medicine, Chungnam National University) ;
  • Kim, Young-Rae (Departments of Biochemistry, College of Medicine, Chungnam National University) ;
  • Jeon, Byeong-Hwa (Departments of Physiology, College of Medicine, Chungnam National University) ;
  • Park, Seung-Kiel (Departments of Biochemistry, College of Medicine, Chungnam National University) ;
  • Oh, Sae-Ock (Departments of Biochemistry, College of Medicine, Chungnam National University) ;
  • Kim, Young-Geun (Departments of Physiology, College of Medicine, Chungnam National University) ;
  • Lee, Sang-Do (Departments of Physiology, College of Medicine, Chungnam National University) ;
  • Kim, Kwang-Jin (Departments of Physiology, College of Medicine, Chungnam National University)
  • Published : 2003.08.21

Abstract

Using phospholipase D1 (PLD1)-overexpressing PC12 (PLD1-PC12) cells, the regulatory roles of PLD1 on ATP-induced currents were investigated. In control and PLD1-PC12 cells, ATP increased PLD activity in an external $Ca^{2+}$ dependent manner. PLD activity stimulated by ATP was substantially larger in PLD1-PC12 cells than in control cells. In whole-cell voltage-clamp mode, ATP induced transient inward and outward currents. The outward currents inhibited by TEA or charybdotoxin were significantly larger in PLD1-PC12 cells than in control cells. The inward currents known as $Ca^{2+}$ permeable nonselective cation currents were also larger in PLD1-PC12 cells than in control cells. However, the difference between the two groups of cells disappeared in $Ca^{2+}$-free external solution, where ATP did not activate PLD. Finally, ATP-induced $^{45}Ca$ uptakes were also larger in PLD1-PC12 cells than in control cells. These results suggest that PLD enhances ATP-induced $Ca^{2+}$ influx via $Ca^{2+}$ permeable nonselective cation channels and increases subsequent $Ca^{2+}$-activated $K^+$ currents in PC12 cells.

Keywords

References

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