The Journal of Membrane Biology

, Volume 70, Issue 2, pp 165–169 | Cite as

Differentiation between serum stimulation of ouabain-resistant and sensitive Rb influx in quiescent NIH 3T3 cells

  • Rivka Panet
  • Ilana Fromer
  • Henri Atlan
Articles
Received:

Summary

The addition of serum to quiescent NIH 3T3 mouse cell cultures resulted in a 10- to 20-fold increase of Rb influx which was resistant to ouabain, and only a three- to fourfold activation of ouabain-sensitive Rb influx. Stimulation of the ouabain-resistant Rb influx following serum addition reached its maximum within 2 min. The stimulation of ouabain-resistant Rb influx was a result ofVm increase while theKm for Rb was unchanged. Ouabain-resistant Rb influx, after serum addition, was resistant to amiloride and sensitive to ethacrinic acid. Replacing chloride in the medium by NO3−, CO3− and CH3COO− resulted in a drastic decrease in the ouabain-resistant Rb influx. It appeared, therefore, that the ouabain-resistant Rb influx in NIH 3T3 cells was Cl−-dependent.

Key Words

ouabain-resistant Rb-influx serum-stimulation 
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Copyright information

© Springer-Verlag New York Inc. 1982

Authors and Affiliations

  • Rivka Panet
    • 1
  • Ilana Fromer
    • 1
  • Henri Atlan
    • 1
  1. 1.Department of Medical Biophysics and Nuclear MedicineHadassah University HospitalJerusalemIsrael

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