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- W2017610630 abstract "1,1,1-Trichloroethane is a widely used solvent that is annually linked to several cases of sudden death following accidental exposure or abuse. Sudden death is believed to be due to ventricular fibrillation or myocardial depression. The purpose of this study was to investigate the mechanism of myocardial depression by assessing the influence of 1,1,1-trichloroethane on intracellular Ca transients in single neonatal rat ventricular myocytes using spectrofluorometric analysis of fura-2-Ca binding. Cells were exposed to 1,1,1-trichloroethane in Hanks' balanced salt solution aliquoted as a 0.2% DMSO solution by a single pass suffusion in an environmentally controlled chamber. 1,1,1-Trichloroethane (0.25 mM-8 mM) reduced the height of electrically (1 Hz, 60 V, 10 ms) induced Ca transients concentration dependently and reversibly to a maximum of about 50% with no effect on diastolic Ca concentration. Video motion analysis revealed an inhibition of contractility in the same concentration range. 1,1,1-Trichloroethane inhibited cytosolic Ca increase in response to KCl-induced (90 mM) depolarizations and further decreased the limited Ca transients in ryanodine (1 microM) pretreated myocytes. Increased external Ca (5 mM) antagonized the effect of 0.5 mM 1,1,1-trichloroethane on the Ca transients. 1,1,1-Trichloroethane reduced the caffeine (10 mM) releasable Ca pool in myocytes. These results show that 1,1,1-trichloroethane inhibits Ca mobilization during excitation-contraction coupling in ventricular myocytes. An inhibitory action on the influx of extracellular Ca as well as on sarcoplasmic reticulum Ca release and sequestration is likely to be responsible for this action." @default.
- W2017610630 created "2016-06-24" @default.
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- W2017610630 date "1992-06-01" @default.
- W2017610630 modified "2023-09-25" @default.
- W2017610630 title "Calcium transients in isolated cardiac myocytes are altered by 1,1,1-trichloroethane" @default.
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- W2017610630 doi "https://doi.org/10.1016/0022-2828(92)91046-8" @default.
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