ryanodine/fever

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[Ryanodine-induced contractures for the diagnosis of malignant hyperthermia susceptibility].

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The halothane-caffeine contracture test is presently the most well-established method for identification of malignant hyperthermia susceptibility (MHS) or non-susceptibility (MHN). However, 10-20% of the patients tested are classified as equivocal (MHE), i.e. their susceptibility remains uncertain.

The ryanodine receptor type 1 gene variants in African American men with exertional rhabdomyolysis and malignant hyperthermia susceptibility.

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It has been suggested that exertional rhabdomyolysis (ER) and malignant hyperthermia (MH) are related syndromes. We hypothesize that patients with unexplained ER harbor mutations in the ryanodine receptor gene type 1 (RYR1), a primary gene implicated in MH, and therefore ER patients are at increased

Ca2+ signaling in HEK-293 and skeletal muscle cells expressing recombinant ryanodine receptors harboring malignant hyperthermia and central core disease mutations.

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Malignant hyperthermia (MH) and central core disease (CCD) are caused by mutations in the RYR1 gene encoding the skeletal muscle isoform of the ryanodine receptor (RyR1), a homotetrameric Ca(2+) release channel. Rabbit RyR1 mutant cDNAs carrying mutations corresponding to those in human RyR1 that

Changes in ryanodine-induced contractures by stimulus frequency in malignant hyperthermia susceptible and malignant hyperthermia nonsusceptible dog skeletal muscle.

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Elective diagnosis of malignant hyperthermia depends on halothane and caffeine contracture testing of biopsied skeletal muscle. Ryanodine-induced contractures may provide greater sensitivity and specificity for malignant hyperthermia (MH) diagnosis. This study investigated the effects of ryanodine

Detection of a novel mutation in the ryanodine receptor gene in an Irish malignant hyperthermia pedigree: correlation of the IVCT response with the affected and unaffected haplotypes.

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Defects in the ryanodine receptor (RYR1) gene are associated with malignant hyperthermia (MH), an autosomal dominant disorder of skeletal muscle and one of the main causes of death resulting from anaesthesia. Susceptibility to MH (MHS) is determined by the level of tension generated in an in vitro

Association of a mutation in the ryanodine receptor 1 gene with equine malignant hyperthermia.

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Equine malignant hyperthermia MH has been suspected but never genetically confirmed. In this study, we investigated whether mutations in a candidate gene, RyR1, were associated with MH in two clinically affected horses. RyR1 gene sequences revealed polymorphisms in exons 15, 17, and 46 in WTRyR1 and

[High purity ryanodine for in vitro diagnosis of malignant hyperthermia].

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OBJECTIVE The identification of disposition for malignant hyperthermia (MH) is performed by the halothane-caffeine contracture test in skeletal muscle. However, testing currently renders about 14% of the patients MH equivocal (MHE). To reduce this number the "ryanodine contracture test" has been

Increased sensitivity to 4-chloro-m-cresol and caffeine in primary myotubes from malignant hyperthermia susceptible individuals carrying the ryanodine receptor 1 Thr2206Met (C6617T) mutation.

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Malignant hyperthermia (MH) is an autosomal-dominant disorder of skeletal muscle, triggered by volatile anaesthetics and depolarizing muscle relaxants. The causative defect lies in the control of Ca(2+) release from the sarcoplasmic reticulum in skeletal muscle. Numerous mutations have been detected

Functional characterization of a distinct ryanodine receptor mutation in human malignant hyperthermia-susceptible muscle.

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Malignant hyperthermia is an inherited autosomal disorder of skeletal muscle in which certain volatile anesthetics and depolarizing muscle relaxants trigger an abnormally high release of Ca2+ from the intracellular Ca2+ store, the sarcoplasmic reticulum. In about 50% of cases, malignant hyperthermia

Chlorocresol, an additive to commercial succinylcholine, induces contracture of human malignant hyperthermia-susceptible muscles via activation of the ryanodine receptor Ca2+ channel.

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BACKGROUND A defect in the ryanodine (Ry1) receptor Ca2+ channel has been implicated as one of the possible underlying causes of malignant hyperthermia (MH), a pharmacogenetic disorder characterized by sustained muscle contracture. The disease is triggered by common halogenated anesthetics and

Altered binding site for Ca2+ in the ryanodine receptor of human malignant hyperthermia.

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The binding properties of [3H]ryanodine, a specific ligand of the receptor complex that forms the Ca2+ release channel of sarcoplasmic reticulum, were studied in normal (N) and malignant hyperthermia-susceptible (MH) human skeletal muscle. Integrity of the solubilized ryanodine receptor was

Comparison of in vitro contracture testing with ryanodine, halothane and caffeine in malignant hyperthermia and other neuromuscular disorders.

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In vitro exposure of living skeletal muscle to ryanodine has been proposed as a potentially specific test for malignant hyperthermia (MH). In this study we have compared in vitro contracture responses to halothane, caffeine and ryanodine in skeletal muscle specimens obtained from 155 patients

Results of contracture tests with halothane, caffeine, and ryanodine depend on different malignant hyperthermia-associated ryanodine receptor gene mutations.

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BACKGROUND More than 20 mutations in the gene encoding for the ryanodine receptor (RYR1), a Ca2+ release channel of the skeletal muscle sarcoplasmic reticulum, have been found to be associated with malignant hyperthermia (MH). This study was designed to investigate the effects of different mutations

3,5-Di-t-butyl catechol is a potent human ryanodine receptor 1 activator, not suitable for the diagnosis of malignant hyperthermia susceptibility.

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3,5-Di-t-butyl catechol (DTCAT) releases Ca(2+) from rat skeletal muscle sarcoplasmic reticulum (SR) vesicles. Hence, it is a candidate for use as a substitute for halothane or caffeine in the in vitro contracture test for the diagnosis of susceptibility to malignant hyperthermia (MH). To

Identical de novo mutation in the type 1 ryanodine receptor gene associated with fatal, stress-induced malignant hyperthermia in two unrelated families.

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BACKGROUND Mutations in the type 1 ryanodine receptor gene (RYR1) result in malignant hyperthermia, a pharmacogenetic disorder typically triggered by administration of anesthetics. However, cases of sudden death during exertion, heat challenge, and febrile illness in the absence of triggering drugs

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