The role of the cellular sodium pump in human granulopoiesis in vitro.

Abstract:

:The specific sodium pump antagonist ouabain was used to study the effect of sodium pump inhibition on granulopoietic colony formation by normal human bone marrow cells cultured in soft agar for 7 d. Suppression of colony formation was dose-dependent and occurred at a low and reproducible concentration. The use of an extended range of concentrations (1 X 10(-19) M to 1 X 10(-4) M) revealed no additional effect. Inhibition occurred when colony formation was stimulated by either normal human white blood cells in a soft agar underlayer, or the inclusion of pre-formed colony-stimulating activity. Sensitivity to inhibition was similar under either set of conditions, the 50% inhibitory concentrations being 2.70 +/- 0.43 (SE) X 10(-8) M and 2.83 +/- 0.21 (SE) X 10(-8) M respectively. This is interpreted as showing an effect primarily on the colony-forming cells rather than on the cellular production of colony-stimulating activity. Inhibition of colony formation by ouabain was opposed by the addition of extra potassium to the culture medium, confirming that the inhibition was mediated via a perturbation of monovalent cation exchange. Inhibition by 2 X 10(-7) M ouabain appeared to be reversible by simple washing after exposure for up to 24 h, suggesting that the inhibitory effect of ouabain is not primarily cytotoxic.

journal_name

Br J Haematol

authors

Steed AJ,Boardman KM,Delamore IW

doi

10.1111/j.1365-2141.1982.tb02795.x

subject

Has Abstract

pub_date

1982-07-01 00:00:00

pages

395-403

issue

3

eissn

0007-1048

issn

1365-2141

journal_volume

51

pub_type

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