..., and a 57% decrease in the V max for Ca 2+ of the exchanger was observed. Apparently, the density of exchanger molecules in the basolateral plasma membrane is reduced in seawater fish. From the correlation between the differences in net intestinal calcium uptake and Na + /Ca 2+ exchange activity we conclude...

...TH. J. M. Schoenmakers; G. Flik ABSTRACT Na + /Ca 2+ exchange activities in purely inside-out and mixed inside-out and right-side-out fish enterocyte basolateral plasma membrane vesicle preparations display equal affinities for Ca 2+ , showing that only the intracellular Ca 2+ transport site...