A search for endogenous Na+,K+-ATPase inhibitor in acutely volume-expanded hog plasma led to lysophosphatidylcholine gamma-stearoyl.

Abstract:

:An Na+,K+-ATPase inhibitor possessing inhibitory activity against the specific binding of ouabain to Na+,K+-ATPase has been purified from the plasma of acutely saline-infused hogs. The purification was performed by a combination of Amberlite XAD-2 adsorption chromatography and five steps of high-pressure liquid chromatography (HPLC). Fast atom bombardment mass and proton nuclear magnetic resonance (NMR) spectrometric studies identified the purified substance as lysophosphatidylcholine gamma-stearoyl (LPCS). The ouabain-displacing activity in plasma, due to this compound, increased with time during saline infusion. The maximal level reached was approximately 12 times higher than that in the pre-infusion plasma sample. Lysophosphatidylcholines (LPCs) containing myristoyl, palmitoyl and oleoyl groups were also inhibitory to Na+,K+-ATPase and ouabain-binding to the enzyme. These LPCs were effective at 100 mumol/l concentrations in attaining 50% inhibition of the enzyme activity and ouabain-binding activity of Na+,K+-ATPase. These results suggest that LPCs containing long chain fatty acids could play an important role as a Na+,K+-ATPase inhibitors under volume-expanded conditions.

journal_name

J Hypertens

journal_title

Journal of hypertension

authors

Tamura M,Inagami T,Kinoshita T,Kuwano H

doi

10.1097/00004872-198704000-00014

subject

Has Abstract

pub_date

1987-04-01 00:00:00

pages

219-25

issue

2

eissn

0263-6352

issn

1473-5598

journal_volume

5

pub_type

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