{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"name":"bioRxiv"}],"indexed":{"date-parts":[[2026,10,26]],"date-time":"2026-10-26T17:29:02Z","timestamp":1793035742170,"version":"4.5.0"},"posted":{"date-parts":[[2025,8,22]]},"group-title":"Molecular Biology","reference-count":84,"publisher":"openRxiv","license":[{"start":{"date-parts":[[2025,8,22]],"date-time":"2025-08-22T00:00:00Z","timestamp":1755820800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/www.biorxiv.org\/about\/FAQ#license"}],"funder":[{"name":"NIH","award":["HL132874"],"award-info":[{"award-number":["HL132874"]}]},{"name":"NIH","award":["AR079477"],"award-info":[{"award-number":["AR079477"]}]},{"name":"AHA"},{"name":"UMN"},{"DOI":"10.13039\/100016944","name":"Regenerative Medicine Minnesota","doi-asserted-by":"crossref","award":["1184847"],"award-info":[{"award-number":["1184847"]}],"id":[{"id":"10.13039\/100016944","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"accepted":{"date-parts":[[2025,9,4]]},"abstract":"<jats:title>Summary<\/jats:title>\n                <jats:p>Cancer cachexia is a highly debilitating clinical syndrome of involuntary body mass loss featuring profound muscle wasting leading to high mortality. Notably, cardiac wasting is prominent in cancer patients and cancer survivors. Cachexia studies present significant challenges due to the absence of human models and mainly short-term animal studies. To address this translational gap, we have developed a robust human-based cachexia experimental approach characterized by marked cardiac muscle wasting and contractile dysfunction, with increased expression of protein degradation markers. Using human iPSC-derived cardiac muscle, we investigated morphological, functional, and metabolic alterations in the key stages of cachexia and in the post-cachexia phase. C26 and HCT116 tumor cell lines were used to induce cachexia by two methods, pulse addition of cancer cell conditioned media or in transwell-adapted co-culture. Cachectic cardiac myocytes exhibited reduced contraction amplitude, prolonged relaxation time, and increased oxygen consumption rate (OCR), as assessed by video-based and Seahorse analyses. Mechanistic investigations centered on the Atrogin-1\/Calcineurin A\/NFAT axis revealed this signaling pathway as a central driver of cachexia-induced cardiac atrophy. Cachectic cardiac myocytes exhibited significant upregulation of Atrogin-1, leading to a marked decrease in Calcineurin A protein levels. This, in turn, impaired nuclear translocation of NFAT, thereby suppressing its transcriptional activity and downstream cell growth signaling. These molecular changes were accompanied by increased autophagic flux, as indicated by elevated LC3BII\/LC3BI ratios. Furthermore, withdrawal of cachexia-inducing stimuli followed by regular media changes for one week led to normalization of Atrogin-1 and autophagy markers; however, functional impairments and metabolic dysregulation persisted, highlighting delayed recovery. Our new findings establish the Atrogin-1\/Calcineurin A\/NFAT axis as a key regulatory mechanism in cardiac muscle wasting and suggest this aberrant signaling axis may serve as a targetable mechanism for treatment of cachexia-induced cardiac dysfunction.<\/jats:p>\n                <jats:sec>\n                  <jats:title>Graphical Abstract<\/jats:title>\n                  <jats:fig id=\"ufig1\" position=\"float\" orientation=\"portrait\" fig-type=\"figure\">\n                    <jats:graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"670675v2_ufig1\" position=\"float\" orientation=\"portrait\"\/>\n                  <\/jats:fig>\n                <\/jats:sec>","DOI":"10.1101\/2025.08.18.670675","type":"posted-content","created":{"date-parts":[[2025,8,23]],"date-time":"2025-08-23T04:10:15Z","timestamp":1755922215000},"source":"Crossref","is-referenced-by-count":3,"title":["Elucidating cancer cachexia-mediated aberrant cardiac wasting signaling in human iPSC-derived cardiac muscle"],"prefix":"10.64898","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4318-1329","authenticated-orcid":false,"given":"Nora","family":"Hosny","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4375-8797","authenticated-orcid":false,"given":"Houda","family":"Cohen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mohamed Waleed","family":"Elafany","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jeff","family":"Schreifels","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-7694-0907","authenticated-orcid":false,"given":"John","family":"Bauer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-1229-4907","authenticated-orcid":false,"given":"Rishi","family":"Gulati","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0072-2225","authenticated-orcid":false,"given":"Brian R.","family":"Thompson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8604-1633","authenticated-orcid":false,"given":"Julia C.","family":"Liu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3882-4326","authenticated-orcid":false,"given":"Joseph M.","family":"Metzger","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"54368","reference":[{"key":"2025090802051097000_2025.08.18.670675v2.1","first-page":"74","article-title":"Cardiac cachexia: perspectives for prevention and treatment","volume":"108","year":"2016","journal-title":"Arquivos brasileiros de cardiologia"},{"key":"2025090802051097000_2025.08.18.670675v2.2","unstructured":"2. 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