Pharmacologic and functional characterization of malignant hyperthermia in the R163C RyR1 knock-in mouse.

Pharmacologic and functional characterization of malignant hyperthermia in the R163C RyR1 knock-in mouse. Research Abstract Details 

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Pharmacologic and functional characterization of malignant hyperthermia in the R163C RyR1 knock-in mouse. Abstract Text:

BACKGROUND: Malignant hyperthermia is a pharmacogenetic disorder affecting humans, dogs, pigs, and horses. In the majority of human cases and all cases in animals, malignant hyperthermia has been associated with missense mutations in the skeletal ryanodine receptor (RyR1). METHODS: The authors used a "knock-in" targeting vector to create mice carrying the RyR1 R163C malignant hyperthermia mutation. RESULTS: Validation of this new mouse model of human malignant hyperthermia susceptibility includes (1) proof of transcription of the R163C allele and expression of ryanodine receptor protein in R163C heterozygous and R163C homozygous animals; (2) fulminant malignant hyperthermia episodes in R163C heterozygous mice after exposure to 1.25-1.75% halothane or an ambient temperature of 42 degrees C characterized by increased rectal temperature, respiratory rate, and inspiratory effort, with significant blood biochemical changes indicating metabolic acidosis, ending in death and hyperacute rigor mortis; (3) intraperitoneal pretreatment with dantrolene provided 100% protection from the halothane-triggered fulminant malignant hyperthermia episode; (4) significantly increased sensitivity (decreased effective concentration causing 50% of the maximal response) of R163C heterozygous and homozygous myotubes to caffeine, 4-chloro-m-cresol, and K-induced depolarization; (5) R163C heterozygous and homozygous myotubes have a significantly increased resting intracellular Ca concentration compared with wild type; (6) R163C heterozygous sarcoplasmic reticulum membranes have a twofold higher affinity (Kd = 35.4 nm) for [H]ryanodine binding compared with wild type (Kd = 80.1 nm) and a diminished inhibitory regulation by Mg. CONCLUSIONS: Heterozygous R163C mice represent a valid model for studying the mechanisms that cause the human malignant hyperthermia syndrome.

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Pharmacologic and functional characterization of malignant hyperthermia in the R163C RyR1 knock-in mouse. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Anesthesiology

VOLUME: 105

Page Numbers: 1164-75

Journal Abbreviation: Anesthesiology

ISSN: 0003-3022

DAY: 3

MONTH: Dec

YEAR: 2006

Pharmacologic and functional characterization of malignant hyperthermia in the R163C RyR1 knock-in mouse. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 1300217

Pharmacologic and functional characterization of malignant hyperthermia in the R163C RyR1 knock-in mouse. Keywords Mesh Terms:

KEYWORDS: Ryanodine Receptor Calcium Release Chann

MESH TERMS: genetics

Chemical & Substance for Abstract: Pharmacologic and functional characterization of malignant hyperthermia in the R163C RyR1 knock-in mouse. Information

Substance Name: Deoxyribonuclease EcoRI

Registry Number: EC 3.1.21.-

Grant and Affiliation Information for Pharmacologic and functional characterization of malignant hyperthermia in the R163C RyR1 knock-in mouse.

AFFILIATION: Department of Anesthesia, Perioperative and Pain Medicine, Brigham & Women's Hospital, Boston, Massachusetts 02115, USA.

Country: United States

AGENCY: United States NIAMS

GRANT: 1R01AR46513

ACRONYM: AR

MEDLINETA: Anesthesiology

REFSOURCE: Anesthesiology. 2006 Dec;105(6):1077-8

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