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- W2041868301 abstract "Engagement of the IP3 receptor by its ligand releases Ca2+ from intracellular stores of the rat basophilic leukemia (RBL) cell. The IP3 receptor in washed permeabilized cells has high affinity (Kd = 1.2 +/- 0.3 nM) for [3H]IP3 and is not sensitive to physiological concentrations of Ca2+. Moreover, washed permeabilized cells only release small amounts of Ca2+ when stimulated with IP3. When [3H]IP3 binding to permeabilized cells is performed in the presence of cytosolic constituents (unwashed cells), the IP3 receptor has a lower affinity for [3H]IP3 (Kd from 20 to 100 nM) and has enhanced Ca2+ release. Cytosolic supernatant, prepared by centrifugation of permeabilized cells and added back to washed permeabilized cells, decreases [3H]IP3 binding in a dose-dependent manner and increases the amount of Ca2+ released by IP3. Depletion of either MgATP or IP3 in the cytosolic supernatant does not affect the supernatant's ability to decrease [3H]IP3 binding. Though MgATP competitively inhibits [3H]IP3 binding, it cannot fully account for the shift in Kd or the modulation of IP3-stimulated Ca2+ release in the presence of cytosol. These findings suggest that components present in the cytosolic supernatant modulate the function of the IP3 receptor by maintaining it in a low affinity state capable of promoting Ca2+ release." @default.
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- W2041868301 date "1993-04-01" @default.
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- W2041868301 title "Regulation of inositol 1,4,5-trisphosphate receptors in rat basophilic leukemia cells. II. Modulation of the receptor in permeabilized cells by the cytosolic compartment" @default.
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- W2041868301 doi "https://doi.org/10.1016/0005-2736(93)90321-p" @default.
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