Overexpression of inositol 1,4,5-trisphosphate 3-kinase in Xenopus oocytes inhibits agonist-evoked capacitative calcium entry
Ins(1,4,5)P3 3-kinase is a key enzyme in the regulation of Ins(1,4,5)P3. Overexpression of Ins(1,4,5)P3 3-kinase inhibited agonist-evoked and Ins(1,3,4,5)P4-evoked Ca2+ entry in Xenopus oocytes, but did not inhibit Ca2+ entry evoked by thapsigargin or non-metabolizable Ins(1,4,5)P3 analogues. The data suggest that Ins(1,4,5)P3 alone plays the crucial role in the activation of capacitative Ca2+ entry by emptying intracellular stores.
Babraham Institute Laboratory of Molecular Signalling, Department of Zoology, University of Cambridge, U.K.
Record created on 2007-12-18, modified on 2016-08-08