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- W1566200309 abstract "Abstract We used a stopped-flow method for determining the kinetic properties (between 10 ms and 10 s) of the Ca2+ release induced by inositol 1,4,5-trisphosphate (InsP3) in saponin-treated rat hepatocytes. Preliminary experiments ensured that the indicator was able to monitor rapid changes in free Ca2+ reliably. At 20 degrees C, a maximally efficient concentration of 10 microM InsP3 released Ca2+ with a half-time of 150-300 ms, the initial rate being about 1-2 nmol of Ca2+/mg of cell protein/s. The delay between the addition of 10 microM InsP3 and the onset of Ca2+ release was shorter than 20 ms, suggesting that the opening process of Ca2+ channels after binding of InsP3 to receptors is completed within a few milliseconds. Half-maximal initial rates for Ca2+ release occurred at about 1 microM InsP3 (Hill index was 1.6). The resulting Ca2+ efflux had a moderate temperature dependence. It could not be fitted to a single exponential. After low speed centrifugation of saponin-treated cells (1000 x g for 1 min), part of the InsP3-sensitive Ca2+ pool was recovered in the cell-free supernatant fraction, suggesting that the response to InsP3 arises from a vesicular fraction which may diffuse from the saponin-treated cells into the medium." @default.
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- W1566200309 date "1989-10-01" @default.
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- W1566200309 title "Fast kinetics of calcium release induced by myo-inositol trisphosphate in permeabilized rat hepatocytes" @default.
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- W1566200309 doi "https://doi.org/10.1016/s0021-9258(19)84623-9" @default.
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