Abstract
Trapezius muscle from normal and malignant hyperthermia (MH) pigs was used to investigate the effects of halothane on contractile properties and on the calcium transport system of isolated surface membranes. We observed that (i) halothane, diluted in dimethyl sulfoxide, induced a higher isometric contracture response in MH muscle than in normal muscle, (ii) halothane had a more pronounced inhibitory effect on the sarcolemmal Ca 2+-ATPase activity in MH membrane, and (iii) the actively accumulated calcium was released in higher amounts in MH muscle than in normal muscle. These results suggest that halothane might induce, in vivo, an important influx of extracellular calcium ions through the MH sarcolemmal membranes and this pool of intracellular calcium may constitute the trigger for the defective sarcoplasmic reticulum “calciuminduced calcium-release” system.
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