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• W2016010885 abstract "La3+ was tested for its ability to distinguish external Na+ (Nao)-independent Ca2+ efflux via the plasma membrane (PM) Ca2+ pump from Nao-dependent Ca2+ efflux via Na+/Ca2+ exchange. Fura-2 loaded cultured rat aortic myocytes were used with digital imaging to measure the cytosolic free Ca2+ concentration ([Ca2+]cyt) and to monitor La3+ entry. At a La3+ concentration ([La3+]o) of 0.25 mM, but not at lower concentrations, La3+ entered the cells; 0.01 mM verapamil blocked this entry. Transient increases in [Ca2+]cyt were evoked by unloading the sarcoplasmic reticulum with cyclopiazonic acid (CPA) + caffeine (CAF) in Na,Ca-free medium (to inhibit Ca2+ extrusion via Na+/Ca2+ exchange and Ca2+ influx). La3+ (0.03–0.25 mM with verapamil) augmented the Ca2+ transients and slowed Nao-independent [Ca2+]cyt recovery in a dose-dependent manner (IC50 ∼ 0.01 mM La3+). This La3+-sensitive recovery was apparently mediated by the PM Ca2+ pump. The effects of La3+ were reversible: [Ca2+]cyt returned promptly toward base line when La3+ was washed out in Na,Ca-free medium containing CPA + CAF. Reintroduction of extracellular Na+ during [Ca2+]cyt recovery ([La3+]o = 0.06–0.25 mM) significantly speeded recovery, indicating that the Na+/Ca2+ exchanger was not inhibited by [La3+]o ≤ 0.25 mM. The La3+-sensitive (Nao-independent) and Nao-dependent [Ca2+]cyt recovery rates were comparable. In Na+-loaded cells, ≤ 0.25 mM La3+ also did not affect Na+/Ca2+ exchange mediated Ca2+ influx. In medium containing Na+ and Ca2+, 0.125 mM La3+ abolished the serotonin (5-HT) evoked plateau responses that resulted from Ca2+ entry via Ca2+ channels. In Na,Ca-free medium, but not Ca-free medium, however, La3+ converted 5-HT evoked Ca2+ transients into sustained responses. We conclude that low [La3+]o (0.06–0.25 mM) inhibits the PM Ca2+ pump, but spares Na+/Ca2+ exchanger mediated Ca2+ influx and efflux in arterial myocytes." @default.
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• W2016010885 date "1997-01-01" @default.
• W2016010885 modified "2023-10-15" @default.
• W2016010885 title "Use of La3+ to distinguish activity of the plasmalemmal Ca2+ pump from Na+/Ca2+ exchange in arterial myocytes" @default.
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• W2016010885 doi "https://doi.org/10.1016/s0143-4160(97)90094-4" @default.
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