title: Dantrolene and calcium uptake by the sarcoplasmic reticulum of malignant hyperpyrexia-susceptible pigs.
abstract: Sarcoplasmic reticulum membranes were isolated from the skeletal muscle of pigs susceptible or resistant to the anaesthetic complication malignant hyperpyrexia. The skeletal muscle relaxant dantrolene was shown to be without effect on the Ca2+ -dependent ATPase activity of either sarcoplasmic reticulum preparation. The active transport of calcium by sarcoplasmic reticulum from both sources was also unaffected by the presence of dantrolene. These findings indicate that dantrolene does not exert its pharmacological action in skeletal muscle by stimulating calcium uptake by the sarcoplasmic reticulum.
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism*; D000255:Adenosine Triphosphate / Q000502:physiology; D000818:Animals; D001692:Biological Transport / Q000187:drug effects; D002118:Calcium / Q000378:metabolism*; D003620:Dantrolene / Q000494:pharmacology*; D066298:In Vitro Techniques; D008305:Malignant Hyperthermia / Q000378:metabolism*; D012519:Sarcoplasmic Reticulum / Q000187:drug effects / Q000201:enzymology*; D013552:Swine
chemical_list: D000255:Adenosine Triphosphate; D000251:Adenosine Triphosphatases; D003620:Dantrolene; D002118:Calcium