Malignant hyperthermia domain in the regulation of ca(2+) release channel (ryanodine receptor).

Malignant hyperthermia (MH) is a potentially lethal condition that is manifested in humans as an acute increase of body temperature in response to stress and exposure to volatile anaesthetics (halothane, enflurane) and muscle relaxants. To date, eight point mutations in the ryanodine receptor gene, the Ca(2+) release channel of the skeletal muscle sarcoplasmic reticulum, segregate with the MH phenotype, yet direct evidence linking altered [Ca(2+)](i) homeostasis to mutation in recombinant RYR has been obtained only for one such mutation. Most of these mutations appear in an "MH domain" that is localized at the NH(2) terminus of the skeletal muscle ryanodine receptor Ca(2+) channel. In this review, we summarize the available data concerning the role of the MH domain in the altered functions of the ryanodine receptor Ca(2+) channel. (Trends Cardiovasc Med 1997;7:312-316). © 1997, Elsevier Science Inc.