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- W2081600082 abstract "K+- and ATP-dependent H+-accumulation in rat heavy gastric membrane vesicles enriched with (H+-K+)-ATPase was markedly stimulated by amphiphiles like lysophosphatidylcholine and Zwittergent 3-14 at concentrations of 10(-5) M. Their stimulatory effect was dependent on K+-concentration in the medium and was abolished by SCH 28,080, a specific inhibitor of (H+-K+)-ATPase. Lysophosphatidylcholine at the optimal dose (3 X 10(-5) M) showed dual effects on K+-dependent membrane functions; it stimulated the rate of K+-uptake by nearly 60%, but partially inhibited SCH 28,080-sensitive and K+-dependent ATP-hydrolysis (about 20% reduction). These data indicate that H+-pumping through (H+-K+)-ATPase in the inside-out gastric membrane vesicles was facilitated by the stimulatory effect of lysophosphatidylcholine on membrane K+-transport in spite of its partial inhibition of ATP-hydrolysis. It appears that the rate limiting step for operation of the ATPase is the availability of K+ ions in the luminal side of the pump. We propose that ionic amphiphiles may modulate K+-transport in rat heavy gastric membranes through specific interactions with the putative K+-transporter." @default.
- W2081600082 created "2016-06-24" @default.
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- W2081600082 date "1987-07-01" @default.
- W2081600082 modified "2023-10-14" @default.
- W2081600082 title "Effect of lysophosphatidylcholine on K+ transport in rat heavy gastric membranes enriched with (H+-K+)-ATPase" @default.
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- W2081600082 doi "https://doi.org/10.1016/0006-291x(87)90607-3" @default.
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