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PDAC patients are frequently affected by cachexia characterized by muscle mass and strength loss (sarcopenia) contributing to patient frailty and poor therapeutic response. This study assesses the mechanisms underlying mitochondrial remodeling in the cachectic skeletal muscle, through an integrative exploration combining functional, morphological, and omics-based evaluation of gastrocnemius muscle from KIC genetically engineered mice developing autochthonous pancreatic tumor and cachexia. Cachectic PDAC KIC mice exhibit severe sarcopenia with loss of muscle mass and strength associated with reduced muscle fiber\u2019s size and induction of protein degradation processes. Mitochondria in PDAC atrophied muscles show reduced respiratory capacities and structural alterations, associated with deregulation of oxidative phosphorylation and mitochondrial dynamics pathways. Beyond the metabolic pathways known to be altered in sarcopenic muscle (carbohydrates, proteins, and redox), lipid and nucleic acid metabolisms are also affected. Although the number of mitochondria per cell is not altered, mitochondrial mass shows a twofold decrease and the mitochondrial DNA threefold, suggesting a defect in mitochondrial genome homeostasis. In conclusion, this work provides a framework to guide toward the most relevant targets in the clinic to limit PDAC-induced cachexia.<\/jats:p>","DOI":"10.7554\/elife.93312","type":"journal-article","created":{"date-parts":[[2024,1,24]],"date-time":"2024-01-24T11:25:05Z","timestamp":1706095505000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.93312","source":"Crossref","is-referenced-by-count":14,"title":["Integrative study of skeletal muscle mitochondrial dysfunction in a murine pancreatic cancer-induced cachexia model"],"prefix":"10.7554","volume":"13","author":[{"given":"Tristan","family":"Gicquel","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/035xkbk20","id-type":"ROR","asserted-by":"publisher"}],"name":"Aix Marseille Univ, CNRS, INSERM, Institut Paoli-Calmettes, CRCM","place":["Marseille, France"]},{"name":"Nutrition And Cancer Research Network (NACRe Network)","place":["Jouy-en-Josas, 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