Abstract
Recent studies in heart cells have shown taurine to induce a sustained increase of both intracellular Ca2+ and Na+. These results led us to believe that the increase in Na+ by taurine could be due to Na+ entry through the taurine-Na+ cotransporter which in turn favours transarcolemmal Ca2+ influx through Na+-Ca2+ exchange. Therefore, we investigated the effect of ²-alanine, a blocker of the taurine-Na+ cotransporter and low concentrations of CBDMB (a pyrazine derivative, 5-(N-4chlorobenzyl)-2′,4′-dimethylbenzamil), a Na+-Ca2+ exchanger blocker on taurine-induced [Ca]. increase in embryonic chick heart cells.
Using Fura-2 Ca2+ imaging and Fluo-3 Ca2+ confocal microscopy techniques, taurine (20 mM) as expected, induced a sustained increase in [Ca]. at both the cytosolic and the nuclear levels. Preexposure to 500 μM of the blocker of the taurine-Na+ cotransporter, ²-alanine, prevented the amino acid-induced increase of total [Ca]i. On the other hand, application of ²-alanine did not reverse the action of taurine on total [Ca]i. However, low concentrations of the Na+-Ca2+ exchanger blocker, CBDMB, reversed the taurine-induced sustained increase of cytosolic and nuclear free calcium (in presence or absence of ²-alanine). Thus, the effect of taurine on [Ca]. in heart cells appears to be due to Na+ entry through the taurine-Na+ cotransporter which in turn favours transarcolemmal Ca2+ influx through the Na+-Ca2+ exchanger. (Mol Cell Biochem 188: 187–197, 1998)
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Bkaily, G. et al. (1998). Taurine indirectly increases [Ca]i by inducing Ca2+ influx through the Na+-Ca2+ exchanger. In: Pierce, G.N., Izumi, T., Rupp, H., Grynberg, A. (eds) Molecular and Cellular Effects of Nutrition on Disease Processes. Developments in Molecular and Cellular Biochemistry, vol 26. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-5763-0_20
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DOI: https://doi.org/10.1007/978-1-4615-5763-0_20
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