Evidence for a Na-K-ATPase-inhibitor in erythrocytes of patients with essential hypertension.

Abstract:

:ATPase activities were determined in haemolysed and dialysed erythrocytes and in haemoglobin-free membranes of twenty patients with essential hypertension and twenty normotensive controls. Ouabain-sensitive ATPase (Na-K-ATPase) activity of haemolysate but not that of membranes was decreased in hypertensives whereas ouabain-insensitive ATPase (Mg-ATPase + some residual Ca-ATPase) activity was increased in both enzyme preparations when measurements were preformed in the absence of Ca2+-chelating substances. In haemolysed erythrocytes ouabain-sensitivity as a percentage of total ATPase activity was a good discriminator between both groups and may be a possible marker for essential hypertension. The decreased activity of Na-K-ATPase in haemolysate is apparently due to a non dialysable inhibitor of Na-K-ATPase which is either tightly bound to the erythrocyte membrane or dissolved in the cytoplasm. Following haemolysis with subsequent centrifugation the Na-K-ATPase inhibitor is removed, at least in part, and thus differences in Na-K-ATPase activity demonstrable in haemolysed and dialysed erythrocytes are no longer apparent in haemoglobin-free membranes.

journal_name

Eur J Clin Invest

authors

Walter U,Müller S

doi

10.1111/j.1365-2362.1985.tb00170.x

subject

Has Abstract

pub_date

1985-08-01 00:00:00

pages

209-14

issue

4

eissn

0014-2972

issn

1365-2362

journal_volume

15

pub_type

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