Sodium transport kinetics in erythrocytes and inside-out vesicles from Milan rats.

Abstract:

:This paper describes the kinetics of the Na(+)-K+ pump and the Na(+)-K(+)-Cl- cotransport in sodium-loaded erythrocytes and of the Na(+)-K(+)-Cl- cotransport in erythrocyte inside-out vesicles (IOV) from Milan hypertensive (MHS) and normotensive (MNS) rats in order to evaluate the possible role of intracellular factor(s). In intact erythrocytes, no difference was detectable in the Na(+)-K+ pump kinetics between the two strains while the apparent affinity (Km) of Na(+)-K(+)-Cl- cotransport for internal sodium was significantly greater and the maximal rate of sodium transport lower in MHS when compared with MNS rats. IOV, which are depleted of cytoskeleton, showed a bumetanide-sensitive potassium- and chloride-dependent sodium uptake. However, the erythrocyte differences in Na(+)-K(+)-Cl- cotransport activity and the Km between strains disappeared in IOV, suggesting tha the altered sodium transport of MHS erythrocyte might be due to some intracellular factor or a membrane skeleton protein abnormality.

journal_name

J Hypertens

journal_title

Journal of hypertension

authors

Ferrari P,Torielli L,Cirillo M,Salardi S,Bianchi G

doi

10.1097/00004872-199108000-00003

subject

Has Abstract

pub_date

1991-08-01 00:00:00

pages

703-11

issue

8

eissn

0263-6352

issn

1473-5598

journal_volume

9

pub_type

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