{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,26]],"date-time":"2026-10-26T21:16:58Z","timestamp":1793049418310,"version":"4.5.0"},"reference-count":42,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2025,1,15]],"date-time":"2025-01-15T00:00:00Z","timestamp":1736899200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2025,1,15]],"date-time":"2025-01-15T00:00:00Z","timestamp":1736899200000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/100000054","name":"National Cancer Institute","doi-asserted-by":"publisher","award":["R01CA270025"],"award-info":[{"award-number":["R01CA270025"]}],"id":[{"id":"10.13039\/100000054","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000050","name":"National Heart, Lung, and Blood Institute","doi-asserted-by":"publisher","award":["T32HL134621"],"award-info":[{"award-number":["T32HL134621"]}],"id":[{"id":"10.13039\/100000050","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000071","name":"National Institute of Child Health and Human Development","doi-asserted-by":"publisher","award":["T32\u2010HD\u2010043730"],"award-info":[{"award-number":["T32\u2010HD\u2010043730"]}],"id":[{"id":"10.13039\/100000071","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J cachexia sarcopenia muscle"],"published-print":{"date-parts":[[2025,2]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Cancer cachexia represents a debilitating muscle wasting condition that is highly prevalent in gastrointestinal cancers, including pancreatic ductal adenocarcinoma (PDAC). Cachexia is estimated to contribute to ~30% of cancer\u2010related deaths, with deterioration of respiratory muscles suspected to be a key contributor to cachexia\u2010associated morbidity and mortality. In recent studies, we identified fibrotic remodelling of respiratory accessory muscles as a key feature of human PDAC cachexia.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>To gain insight into mechanisms driving respiratory muscle wasting and fibrotic remodelling in response to PDAC, we conducted temporal histological and transcriptomic analyses on diaphragm muscles harvested from mice\u2010bearing orthotopic murine pancreatic (KPC) tumours at time points reflective of precachexia (D8 and D10), mild\u2013moderate cachexia (D12 and D14) and advanced cachexia (endpoint).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      During the precachexia phase, diaphragms showed significant leukocyte infiltration (+3\u2010fold to +13\u2010fold; D8\u2014endpoint vs. Sham,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.05) and transcriptomic enrichment of inflammatory processes associated with tissue injury that remained increased through endpoint. Diaphragm inflammation was followed by increases in PDGFR\u2010\u0251\n                      <jats:sup>+<\/jats:sup>\n                      fibroadipogenic progenitors (+2.5 to +3.8\u2010fold; D10\u2014endpoint vs. Sham,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.05), fibre atrophy (\u221216% to \u221224%, D12 to endpoint vs. Sham,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.05), ECM expansion (+1.5 to +1.8\u2010fold; D14\u2014endpoint vs. Sham,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.05), collagen accumulation (+3.8\u2010fold; endpoint vs. Sham,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.0013) and reductions in breathing frequency (\u221255%,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.0074) and diaphragm excursion (\u221243%,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.0006). These biological processes were supported by changes in the diaphragm transcriptome. Ingenuity pathway analysis predicted factors involved in inflammatory responses to tissue injury, including TGF\u2010\u03b21, angiotensin and PDGF BB, as top upstream regulators activated in diaphragms prior to and throughout cachexia progression, while PGC\u20101\u03b1 and the insulin receptor were among the top upstream regulators predicted to be suppressed. The transcriptomic dataset further revealed progressive disturbances to networks involved in lipid, glucose and oxidative metabolism, activation of the unfolded protein response and neuromuscular junction remodelling associated with denervation.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>In summary, our data support leukocyte infiltration and expansion of PDGFR\u03b1 mesenchymal progenitors as early events that precede wasting and fibrotic remodelling of the diaphragm in response to PDAC that may also underlie metabolic disturbances, weakness and respiratory complications.<\/jats:p>\n                  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