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Régulation du calcium neuronal et stress cellulaire dans l’hyperthermie maligne

Régulation du calcium neuronal et stress cellulaire dans l’hyperthermie maligne

Jason Santiago

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Editorial:
KS OmniScriptum Publishing
Año de edición:
2024
Materia
Ciencia: cuestiones generales
ISBN:
9786208140663
50,73 €
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Les ions calcium (Ca2+) sont des molécules de signalisation essentielles et doivent être soigneusement régulés pour préserver la spécificité de la fonction. Le canal de libération du calcium du récepteur de la ryanodine (RyR) est une protéine de signalisation du Ca2+ indispensable. RyR1 est essentiel à la contraction musculaire, et les mutations de RyR1 peuvent entraîner de graves troubles musculaires tels que l’hyperthermie maligne (HM). Récemment, un modèle murin d’HM humaine (Y522S-RyR1) a été mis au point. Dans le muscle squelettique, Y522S-RyR1 présente une sensibilité accrue à l’activation, ce qui entraîne une fuite de Ca2+, une désorganisation mitochondriale et un stress cellulaire. Bien que l’expression de RyR1 soit limitée dans le cerveau, le cervelet pourrait être particulièrement vulnérable à cette maladie car RyR1 est fortement exprimé dans les neurones de Purkinje. Dans cette étude, Y522S-RyR1 dans les cellules de Purkinje présente un seuil d’activation plus bas, mais ne provoque pas de stress et de dommages cellulaires graves. L’étude future des mécanismes compensatoires de la libération accrue de Ca2+ dans les cellules de Purkinje pourrait avoir une valeur thérapeutique pour de nombreux troubles neurologiques et musculaires.

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