Strenuous exercise triggers a life-threatening response in mice susceptible to malignant hyperthermia
In humans, hyperthermic episodes can be triggered by halogenated anesthetics [malignant hyperthermia (MH) susceptibility] and by high temperature [environmental heat stroke (HS)]. Correlation between MH susceptibility and HS is supported by extensive work in mouse models that carry a mutation in rya...
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Published in | The FASEB journal Vol. 31; no. 8; p. 3649 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
01.08.2017
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Subjects | |
Online Access | Get more information |
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Summary: | In humans, hyperthermic episodes can be triggered by halogenated anesthetics [malignant hyperthermia (MH) susceptibility] and by high temperature [environmental heat stroke (HS)]. Correlation between MH susceptibility and HS is supported by extensive work in mouse models that carry a mutation in ryanodine receptor type-1 (RYR1
) and calsequestrin-1 knockout (CASQ1-null), 2 proteins that control Ca
release in skeletal muscle. As overheating episodes in humans have also been described during exertion, here we subjected RYR1
and CASQ1-null mice to an exertional-stress protocol (incremental running on a treadmill at 34°C and 40% humidity). The mortality rate was 80 and 78.6% in RYR1
and CASQ1-null mice, respectively,
0% in wild-type mice. Lethal crises were characterized by hyperthermia and rhabdomyolysis, classic features of MH episodes. Of importance, pretreatment with azumolene, an analog of the drug used in humans to treat MH crises, reduced mortality to 0 and 12.5% in RYR1
and CASQ1-null mice, respectively, thanks to a striking reduction of hyperthermia and rhabdomyolysis. At the molecular level, azumolene strongly prevented Ca
-dependent activation of calpains and NF-κB by lowering myoplasmic Ca
concentration and nitro-oxidative stress, parameters that were elevated in RYR1
and CASQ1-null mice. These results suggest that common molecular mechanisms underlie MH crises and exertional HS in mice.-Michelucci, A., Paolini, C., Boncompagni, S., Canato, M., Reggiani, C., Protasi, F. Strenuous exercise triggers a life-threatening response in mice susceptible to malignant hyperthermia. |
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ISSN: | 1530-6860 |
DOI: | 10.1096/fj.201601292R |