Analysis of Vasopressin-Induced $Ca^{2+}$ Increase in Rat Hepatocytes

  • Kim, Hyun-Sook (Laboratory of Pharmacology, College of Pharmacy, Pusan National University) ;
  • Fumikazu-Okajima (Laboratory of Signal Transduction, Institute for Molecular and Cellular Regulation, Gunma University) ;
  • Im, Dong-Soon (Laboratory of Pharmacology, College of Pharmacy, Pusan National University)
  • Published : 2003.01.01

Abstract

To analyze vasopressin-induced $Ca^{2+}$ increase in liver cells, rat hepatocytes were isolated and attached to collagen-coated cover slips. Using fura-2, a $Ca^{2+}$-sensing dye, changes in intracellular $Ca^{2+}$ concentration by vasopressin were monitored. Results in this communication suggested that vasopressin-induced $Ca^{2+}$ increase were composed of both $Ca^{2+}$ release from internal $Ca^{2+}$ stores and influx from the plasma membrane. The $Ca^{2+}$ influx consisted of two distinguishable components. One was dependent on the presence of vasopressin and the other was not. SK&F96365 blocked vasopressin-induced $Ca^{2+}$ influx in a dose-dependent manner. Vasopressin-induced $Ca^{2+}$ release from internal stores diminished in a primary culture of hepatocytes according to the culture time. However, changes in vasopressin-induced $Ca^{2+}$ influx across the plasma membrane differed from changes in the $Ca^{2+}$ release from internal stores, suggesting two separate signalings from receptor activation to internal stores and to the plasma membrane.

Keywords

References

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