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Calcium efflux from human erythrocyte ghosts.

H Porzig1

  • 1Pharmakologisches Institut, Universität Mainz, Germany.

The Journal of Membrane Biology
|November 1, 2013
PubMed
Summary
This summary is machine-generated.

Passive calcium (Ca) efflux from human red blood cells was studied. Results indicate a carrier-mediated Ca-Ca exchange diffusion in the erythrocyte membrane, with saturation kinetics observed.

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Area of Science:

  • Cellular Biology
  • Biochemistry
  • Membrane Transport

Background:

  • Calcium ions (Ca) play crucial roles in cellular processes.
  • Understanding Ca efflux mechanisms in red blood cells is vital for cellular homeostasis.
  • Previous studies have explored Ca transport, but passive efflux kinetics require further elucidation.

Purpose of the Study:

  • To investigate the kinetics and characteristics of passive Ca efflux from human red cell ghosts.
  • To compare passive Ca efflux with ATP-dependent Ca efflux.
  • To identify factors influencing passive Ca transport across the erythrocyte membrane.

Main Methods:

  • Human red cell ghosts were loaded with radioactive Ca-45 during reversible hemolysis.
  • The rate of Ca-45 loss into the incubation medium was measured at 37°C.
  • Efflux curves were analyzed to determine rate constants and identify kinetic patterns.

Main Results:

  • Passive Ca efflux followed simple two-compartment system kinetics, exhibiting saturation at higher external Ca concentrations.
  • Strontium (Sr) activated passive Ca transfer, while alkali metal ions (Na, K, Li) had no significant effect.
  • Magnesium (Mg) slightly inhibited, and Lead (Pb) strongly inhibited passive Ca efflux. A fraction of intracellular Ca was "inexchangeable".

Conclusions:

  • The findings suggest a carrier-mediated Ca-Ca exchange diffusion mechanism in the erythrocyte membrane.
  • Only a subpopulation of ghost cells appears to participate in this Ca exchange diffusion.
  • Passive Ca efflux differs significantly from active ATP-dependent Ca transport in red blood cells.