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Vol. 273, Issue 1, 133-142, January 2, 1998

Receptor-activated Ca2+ Influx via Human Trp3 Stably Expressed in Human Embryonic Kidney (HEK)293 Cells
EVIDENCE FOR A NON-CAPACITATIVE Ca2+ ENTRY

Xi ZhuDagger , Meisheng Jiang, and Lutz Birnbaumerpar

From the Dagger  Department of Pharmacology and Neurobiotechnology Center, Ohio State University, Columbus, Ohio 43210 and Departments of  Anesthesiology and Biological Chemistry, School of Medicine, and the par  Molecular Biology and Brain Research Institutes, UCLA, Los Angeles, California 90095

Ca2+ release from its internal stores as a result of activation of phospholipase C is accompanied by Ca2+ influx from the extracellular space. Ca2+ influx channels may be formed of proteins homologous to Drosophila Trp. At least six non-allelic Trp genes are present in the mouse genome. Full-length human, bovine, mouse, and rat cDNAs for Trp1, 3, 4, 6 have been cloned. Expression of these genes in various mammalian cells has provided evidence that Trp proteins form plasma membrane Ca2+-permeant channels that can be activated by an agonist that activates phospholipase C, by inositol 1,4,5-trisphosphate, and/or store depletion. We have stably expressed human Trp3 (hTrp3) in human embryonic kidney (HEK)293 cells. Measurement of intracellular Ca2+ concentrations in Fura2-loaded cells showed that cell lines expressing hTrp3 have significantly higher basal and agonist-stimulated influxes of Ca2+, Mn2+, Ba2+, and Sr2+ than control cells. The increase in Ca2+ entry attributable to the expression of hTrp3 obtained upon store depletion by thapsigargin was much lower than that obtained by stimulation with agonists acting via a Gq-coupled receptor. Addition of agonists to thapsigargin-treated Trp3 cells resulted in a further increase in the entry of divalent cations. The increased cation entry in Trp3 cells was blocked by high concentrations of SKF 96365, verapamil, La3+, Ni2+, and Gd3+. The Trp3-mediated Ca2+ influx activated by agonists was inhibited by a phospholipase C inhibitor, U73122. We propose that expression of hTrp3 in these cells forms a non-selective cation channel that opens after the activation of phospholipase C but not after store depletion. In addition, a subpopulation of the expressed hTrp3 may form heteromultimeric channels with endogenous proteins that are sensitive to store depletion.


Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.



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