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- W1972697950 abstract "Ruthenium red, a powerful inhibitor of Ca2+ transport by mitochondria, does not inhibit the active Ca2+ uptake by sarcoplasmic reticulum isolated from rabbit skeletal muscle promoted by 5 mM ATP-Mg in the presence or absence of potassium oxalate. Although concentrations of ruthenium red up to 100 μM do not affect the active uptake of Ca2+, 25 μM of the inorganic dye inhibit the passive binding of Ca2+ by about 50%. This inhibitory effect is observed in sarcoplasmic reticulum even after its lipid fraction is extracted with acetone. Although active Ca2+ uptake by sarcoplasmic reticulum is not inhibited by ruthenium red, in the absence of oxalate it inhibits significantly the Ca2+-dependent ATPase activity but not the Mg2+-ATPase. However, if potassium oxalate is present, the Ca2+-stimulated ATPase is not sensitive to the dye. It is not clear how oxalate functions to protect the Ca2+-ATPase against the inhibitor effect of ruthenium red. The high sensitivity to ruthenium red of the Ca2+ transport mechanism in mitochondria as compared to the Ca2+ transport in sarcoplasmic reticulum may be useful in determining the extent to which each organelle functions in the cell to regulate intracellular free Ca2+." @default.
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- W1972697950 date "1973-10-01" @default.
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- W1972697950 title "Effects of ruthenium red on Ca2+ uptake and ATPase of sarcoplasmic reticulum of rabbit skeletal muscle" @default.
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- W1972697950 doi "https://doi.org/10.1016/0005-2728(73)90147-3" @default.
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