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Am J Physiol Cell Physiol 237: C10-C16, 1979;
0363-6143/79 $5.00
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AJP - Cell Physiology, Vol 237, Issue 1 10-C16, Copyright © 1979 by American Physiological Society

ARTICLES

Active and passive Ca movements in dog red blood cells and resealed ghosts

J. C. Parker

Dog red blood cells accumulate Ca rapidly when deprived of substrate or cooled to 5 degrees C. The latter effect is reversible as the cells are rewarmed to body temperature. Resealed ghosts extrude Ca, provided ATP is incorporated in them. Passive fluxes of Ca are stimulated by Na on the opposite side of the membrane, consistent with a model for Ca-Na countertransport. Quinidine, cell shrinkage, and low pH--all known to suppress net Ca influx--have no accelerating effect on Ca efflux, thus validating earlier conclusions about the variability of the coupling ratio for Ca-Na exchange. The significance of these findings for cell volume regulation is discussed.


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O. Aharonovitz, N. Demaurex, M. Woodside, and S. Grinstein
ATP dependence is not an intrinsic property of Na+/H+ exchanger NHE1: requirement for an ancillary factor
Am J Physiol Cell Physiol, June 1, 1999; 276(6): C1303 - C1311.
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