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Store-operated cationic channels in human myeloid leukaemia K562 cells

Sergeev, I.S.; Glushankova, L.N.; Neguliaev, I.A.

Tsitologiia 44(6): 545-550

2002

ISSN/ISBN: 0041-3771
PMID: 12236097
Document Number: 546062
Using the whole-cell patch clamp technique, single channels operated by intracellular Ca(2+)-store depletion were first revealed in human myeloid leukaemia cells K562. A single store-operated channel could be detected in divalent-free extracellular solutions with Na+ as a permeant ion, and intracellular solutions with strong Ca(2+)-helating agent with some delay after whole-cell formation. Addition of inositol-1,4,5-triphosphate to the pipette solution resulted in a significant decrease of this latency. These channels had a conductance of 29 pS, and were inhibited by low concentration of external Ca2+. Our results enable us to assume that the revealed channels are calcium release-activated calcium channels, operated by Ca2+ depletion of endoplasmic reticulum.

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