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Life Sciences 1991

Fatty acids markedly lower the threshold for halothane-induced calcium release from the terminal cisternae in human and porcine normal and malignant hyperthermia susceptible skeletal muscle.

Watumiaji waliosajiliwa tu ndio wanaweza kutafsiri nakala
Ingia / Ingia
Kiungo kimehifadhiwa kwenye clipboard
J E Fletcher
S Mayerberger
L Tripolitis
M Yudkowsky
H Rosenberg

Maneno muhimu

Kikemikali

Malignant hyperthermia is caused by an abnormal increase in Ca2+ levels in skeletal muscle in response to anesthetics, including halothane. Since fatty acid production is elevated in skeletal muscle from individuals with malignant hyperthermia, the effects of fatty acids on the threshold of halothane-induced Ca2+ release were examined. In the absence of fatty acids halothane caused Ca2+ release from porcine and human heavy sarcoplasmic reticulum fractions, but only at concentrations above the clinically relevant range. Oleic acid (20 microM), an unsaturated fatty acid, reduced the threshold at which halothane induced Ca2+ release to concentrations used for anesthesia. Stearic acid, a saturated fatty acid had considerably less effect on the threshold of halothane action. The greater sensitivity of malignant hyperthermia muscle to halothane can be explained by elevated fatty acid production.

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