The effect of Lanthanum on electrophoretic mobility and passive cation movements of the ehrlich ascites tumor cell

Thomas C. Smith

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

We have investigated the effects of La+3 binding to the surface of Ehrlich ascites tumor cells on cell electrophoretic mobility and passive movements of Na+ and K+. Incubation of tumor cells in La+3‐containing media results in a La+3 concentration‐dependent decrease in net surface charge negativity. At [La+3] greater than 0.5 mM, the net surface charge becomes positive with maximum positivity occurring at [La+3] = 0.9 mM. The effects of La+3 binding on passive Na+ and K+ movements were investigated by following 22Na and K+ losses from ouabain‐inhibited cells. Neither low (0.02) nor high (1.0 mM) [La+3] had any effect on the K+ efflux rate coefficient. 22Na losses from control and La+3‐treated cells were consistent with washouts from two cellular compartments. Low [La+3] (0.02 mM) was without effect on Na+ loss from the cells. However, higher [La+3] (1.0 mM) resulted in a 48% inhibition of Na+ loss from the more slowly exchanging compartment. These results are not consistent with simple electrostatic interactions exerting a major influence on the passive movements of Na+ and K+. It is suggested that La+3 interacts with sites specific for Na+, perhaps involved in a carrier‐mediated exchange system.

Original languageEnglish (US)
Pages (from-to)47-52
Number of pages6
JournalJournal of Cellular Physiology
Volume87
Issue number1
DOIs
StatePublished - Jan 1976
Externally publishedYes

ASJC Scopus subject areas

  • Physiology
  • Clinical Biochemistry
  • Cell Biology

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