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<dc:title xml:lang="en">Physiopathology and therapeutic approaches for tubular aggregate myopathy (TAM) and Stormorken syndrome (STRMK)</dc:title>
<dcterms:alternative xml:lang="fr">Physiopathologie et approches thérapeutiques de la myopathie à agrégats tubulaires (TAM) et du syndrome de Stormorken (STRMK)</dcterms:alternative>
<dc:subject xml:lang="fr">Myopathie à agrégats tubulaires</dc:subject>
<dc:subject xml:lang="fr">Syndrome de Stormorken</dc:subject>
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<dc:subject xml:lang="en">Tubular aggregate myopathy</dc:subject>
<dc:subject xml:lang="en">Stormorken syndrome</dc:subject>
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<dcterms:abstract xml:lang="fr">La myopathie à agrégats tubulaires (TAM) et le syndrome de Stormorken (STRMK) forment un spectre clinique affectant le muscle squelettique, la rate et les plaquettes. TAM/STRMK est causée par des mutations à gain de fonction dans STIM1 et ORAI1, entraînant une entrée excessive de Ca²⁺. Le mécanisme pathologique de TAM/STRMK reste mal compris, et aucun traitement n’est disponible. Pour y remédier, j’ai généré et caractérisé le modèle murin Orai1V109M/+, qui a reproduit les signes cliniques de la maladie. J’ai également évalué des stratégies thérapeutiques ciblant ORAI1 avec des shRNA et des ASOs, améliorant partiellement les phénotypes du muscle et de la rate dans le modèle murin Stim1R304W/+. Enfin, j’ai étudié le rôle de STIM1 dans le vieillissement physiologique. Sa réduction a induit une fatigue musculaire due à des altérations mitochondriales. Ces résultats éclaircissent le rôle du Ca2+ dans la physiologie et dans TAM/STRMK, et identifient la modulation d’ORAI1 comme une approche thérapeutique prometteuse.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Tubular aggregate myopathy (TAM) and Stormorken syndrome (STRMK) are a continuum of the same multisystemic disease affecting skeletal muscle, spleen and platelets, caused by gain-of-function mutations in STIM1 and ORAI1, leading to excessive Ca2+ entry. The pathomechanism of TAM/STRMK remains poorly understood, and currently no therapy is available. To address this, I generated and characterized the Orai1V109M/+ mouse model, which reproduced key features of the human disease. I also evaluated therapeutic strategies downregulating ORAI1 using shRNA and ASOs, partially rescuing muscle and spleen phenotypes in a TAM/STRMK mouse model (Stim1R304W/+). Finally, I investigated the role of STIM1 in physiological aging. STIM1 reduction induced muscle fatigue due to mitochondrial alterations. Together, these findings provide new insights into the role of Ca2+ in physiology and in TAM/STRMK, and identify ORAI1 modulation as a promising therapeutic approach.</dcterms:abstract>
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