{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"name":"bioRxiv"}],"indexed":{"date-parts":[[2026,4,22]],"date-time":"2026-04-22T20:58:05Z","timestamp":1776891485334,"version":"3.51.2"},"posted":{"date-parts":[[2026,4,20]]},"group-title":"Pathology","reference-count":61,"publisher":"openRxiv","license":[{"start":{"date-parts":[[2026,4,20]],"date-time":"2026-04-20T00:00:00Z","timestamp":1776643200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"accepted":{"date-parts":[[2026,4,19]]},"abstract":"Abstract<\/jats:title>\n Increased literature support the pathogenetic role of dysfunctional energetic metabolism in the setup and progression of organ damage and failure. Genetic diseases often offer the possibility to investigate pathogenetic mechanisms. In particular, excessive cardiac damage is the most frequent cause of mortality in Fabry disease (FD), a genetic condition caused by deficient \u03b1-galactosidase A (GLA) activity, leading to globotriaosylceramide (Gb3) accumulation. Beyond Gb3 storage, metabolic alterations and mitochondrial dysfunction, supported by in vitro evidence or studies in other tissues, may contribute to FD cardiomyopathy. This study investigated, for the first time, the mechanisms of mitochondrial involvement in FD, its role in determining cardiac manifestations, and its potential as a therapeutic target. We used a humanized FD mouse model (R301Q-Tg\/GLA knockout), along with derived embryonic fibroblasts and neonatal and adult cardiomyocytes, to assess mitochondrial function across the lifespan. FD cells showed impaired mitophagy, reduced mitochondrial respiration, and increased reactive oxygen species production. Importantly, this mitochondrial dysfunction exacerbated the lysosomal deficit in FD cells, forming a vicious cycle. In cardiomyocytes, these alterations progressed with age, leading to the accumulation of dysfunctional mitochondria, energetic failure, and, in adult hearts, terminal mitochondrial damage and apoptosis. These events ultimately result in cardiac remodeling and dysfunction, including hypertrophy and diastolic impairment. Indeed, L-arginine supplementation, which promotes NO\/PGC-1\u03b1\u2013dependent mitochondrial rescue, prevented the development of cardiac abnormalities in FD mice. Our findings identify early mitochondrial dysfunction as a key driver of FD cardiomyopathy and support mitochondrial targeting, including L-arginine supplementation, as a promising adjuvant therapeutic strategy. The mechanistic link between lysosomal dysfunction, altered mitochondrial turnover, and energetic collapse emerges as a key targetable pathway in organ damage, extending beyond FD.<\/jats:p>\n \n Graphical abstract<\/jats:title>\n \n \n <\/jats:fig>\n <\/jats:sec>\n \n Cardiac manifestations vs mitochondrial alterations in Fabry disease: the visible tip and the hidden base of the iceberg<\/jats:title>\n Cardiac manifestations in hR301Q Tg\/KO mice become evident from 9 months of age. However, mitochondrial homeostasis is perturbed much earlier (neonatal to young stages), with impaired mitophagy, reduced mitochondrial respiration and membrane potential, increased ROS production and PGC-1\u03b1 downregulation. At later stages, from 6 months of age, mitochondrial dysfunction progresses and begins to impact cellular energetics, as indicated by reduced ETC expression and the onset of energetic deficit (ATP reduction). The resulting energetic collapse, together with progressive mitochondrial leakage, leads to cardiomyocyte hypertrophy, apoptosis, and dysfunction, which become detectable from 9 months of age, when clinical signs emerge. These findings support a mechanistic model in which 1) lysosomal incompetence due to GLA deficit is the initiating event inducing impairment of mitophagy; 2) Unsuccessful mitophagy, induces downregulation of PGC-1a-dependent mitogenesis; 3) exhausted mitochondria accumulate, inducing energetic collapse (able to exacerbate lysosomal dysfunction and further perturb mitophagy in a vitious cycle); 4) ultimate mitochondrial leakage induces Cytochrome C release and apoptosis activation. This cascade of molecular events is responsible for clinical manifestations, and mitochondrial targeting prevents cardiac organ damage.<\/jats:p>\n <\/jats:sec>\n \n Significance statement<\/jats:title>\n Fabry disease is a rare genetic disorder in which cardiac complications are a major cause of death, yet underlying mechanisms remain unclear. Here, we identify mitochondrial dysfunction as an early pathogenic event associated with impaired mitophagy, whereby defective mitochondrial quality control both results from and exacerbates lysosomal dysfunction, creating a self-reinforcing cycle that drives disease progression. Using a humanized model, we demonstrate that mitochondrial dysfunction is a key determinant of cardiac phenotype in vivo, driving energetic failure, oxidative stress, and cardiac damage. Importantly, L-arginine treatment restores mitochondrial function and prevents cardiac abnormalities. Our findings define a broadly relevant pathogenic axis linking lysosomal dysfunction, mitophagy failure, and mitochondrial impairment, that lead to impaired energetic metabolism and consequent cardiac hypertrophy, independently from GB3 accumulation. The implications of our study go beyond Fabry disease and support the therapeutic targeting of cellular energy homeostasis to prevent and treat organ damage and failure in chronic diseases.<\/jats:p>\n <\/jats:sec>\n \n IMPORTANT<\/jats:title>\n \n \n Manuscripts submitted to Review Commons are peer reviewed in a journal-agnostic way.<\/jats:p>\n <\/jats:list-item>\n \n Upon transfer of the peer reviewed preprint to a journal, the referee reports will be available in full to the handling editor.<\/jats:p>\n <\/jats:list-item>\n \n The identity of the referees will NOT be communicated to the authors unless the reviewers choose to sign their report.<\/jats:p>\n <\/jats:list-item>\n \n The identity of the referee will be confidentially disclosed to any affiliate journals to which the manuscript is transferred.<\/jats:p>\n <\/jats:list-item>\n <\/jats:list>\n <\/jats:sec>\n \n GUIDELINES<\/jats:title>\n \n \n \n For reviewers:\n https:\/\/www.reviewcommons.org\/reviewers<\/jats:ext-link>\n <\/jats:p>\n <\/jats:list-item>\n \n \n For authors:\n https:\/\/www.reviewcommons.org\/authors<\/jats:ext-link>\n <\/jats:p>\n <\/jats:list-item>\n <\/jats:list>\n <\/jats:sec>\n \n CONTACT<\/jats:title>\n \n The Review Commons office can be contacted directly at:\n office@reviewcommons.org<\/jats:email>\n <\/jats:p>\n <\/jats:sec>","DOI":"10.64898\/2026.04.15.718770","type":"posted-content","created":{"date-parts":[[2026,4,20]],"date-time":"2026-04-20T18:25:18Z","timestamp":1776709518000},"source":"Crossref","is-referenced-by-count":0,"title":["Early mitophagy defects and impaired mitochondrial energy metabolism drive target organ damage progression: lessons from the Fabry heart"],"prefix":"10.64898","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5563-3153","authenticated-orcid":false,"given":"Jessica","family":"Gambardella","sequence":"first","affiliation":[{"name":"Department of Clinical Medicine and Surgery, Federico II University, Naples, Italy"},{"name":"Interdepartmental 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