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- W2076838559 abstract "M. L. Yudkowsky, J. Beech and J. E. Fletcher. Myotoxin a reduces the threshold for calcium-induced calcium release in skeletal muscle. Toxicon32, 273–278, 1994.—Myotoxin a, isolated from the venom of the prairie rattlesnake Crotalus viridis viridis, induces necrosis in skeletal muscle. In isolated organelles, it has been reported that myotoxin a reduces Ca2+ uptake into the sarcoplasmic reticulum. The effects of the toxin on Ca2+ regulation were examined in heavy sarcoplasmic reticulum fractions from human and equine skeletal muscle. Ca2+ uptake and release (the threshold of Ca2+-induced Ca2+ release) were examined by dual wavelength spectrophotometry. The toxin lowered the threshold of Ca2+-induced Ca2+ release in a dose-dependent manner (1–10 μM) and this effect was antagonized by ruthenium red, a Ca2+ release channel blocker. Ca2+ uptake into equine heavy sarcoplasmic reticulum was not decreased by myotoxin a (10 μM) when Ca2+ release was blocked by ruthenium red. [3H]Ryanodine binding to equine heavy sarcoplasmic reticulum was converted from a relatively low affinity state to a higher affinity state by myotoxin a. These results suggest that the dominant effect of myotoxin a is to increase the Ca2+ sensitivity for the opening of the calcium release channel (ryanodine receptor). Myotoxin a may prove to be a useful tool to probe the modulation of calcium release in sarcoplasmic reticulum fractions." @default.
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- W2076838559 date "1994-03-01" @default.
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- W2076838559 title "Myotoxin a reduces the threshold for calcium-induced calcium release in skeletal muscle" @default.
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- W2076838559 doi "https://doi.org/10.1016/0041-0101(94)90080-9" @default.
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