PMID: 7525830Jan 1, 1994Paper

The Na(+)-independent taurine influx in flounder erythrocytes and its association with the volume regulatory taurine efflux

The Journal of Experimental Biology
S Thoroed, K Fugelli

Abstract

95% of the Na(+)-independent influx of taurine in flounder erythrocytes at normal osmolality (330 mosmol kg-1) and 0.30 mmol l-1 taurine was mediated by a saturable system (Vmax = 0.689 nmol g-1 dry mass min-1; Km = 0.47 mmol l-1). The influx was inhibited by taurine analogues, but was not significantly affected by reduced osmolality. This saturable influx of taurine was probably mediated by the so-called Na(+)-dependent influx system for taurine operating in the 0 Na+: 1 taurine mode. The remaining 5% of the Na(+)-independent influx was mediated by a diffusional pathway (Kd = 0.050 microliter g-1 dry mass min-1), since it did not show saturation kinetics, was not inhibited by taurine analogues and did not mediate counter-exchange. This non-saturable influx system for taurine was strongly, but transiently, stimulated by reduction of osmolality. The time course for this stimulatory effect was the same as that for the system that mediates the volume regulatory efflux of taurine. The relative inhibitory effect of bumetanide, furosemide, DIDS and quinine on the fluxes mediated by these two transport systems were also the same. We suggest that these unidirectional fluxes of taurine were mediated by only one transport system: a tauri...Continue Reading

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