PMID: 9528685Apr 7, 1998Paper

Characterization of L-arginine uptake by plasma membrane vesicles isolated from cultured pulmonary artery endothelial cells

Biochimica Et Biophysica Acta
Sergey I Zharikov, E R Block

Abstract

We investigated the mechanisms of [3H]-L-arginine transport via System Y+ using plasma membrane vesicles derived from cultured pulmonary artery endothelial cells. [3H]-L-arginine uptake into plasma membrane vesicles was Na-independent, sensitive to trans-stimulation, unaffected by proton-conducting ionophores, and selectively inhibited by cationic amino acids. Kinetic experiments performed over a wide range of substrate concentrations revealed only one population of L-arginine transporters with Km = 130 microM. To elucidate the driving force for L-arginine transport, we measured [3H]-L-arginine uptake by plasma membrane vesicles at different transmembrane ion gradients. Plasma membrane vesicles accumulated [3H]-L-arginine only when a membrane potential was imposed across the vesicles, and the velocity of uptake was linearly related to the magnitude of the created membrane potential. The presence of potassium ions inside the vesicles was not essential for uptake of L-arginine into vesicles, but it was essential for trans-stimulation of L-arginine transport. [3H]-L-arginine accumulated in plasma membrane vesicles can be released by agents that dissipate transmembrane potassium gradients (e.g. saponin, gramicidin, and nigericin). ...Continue Reading

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