{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T17:35:51Z","timestamp":1791912951631,"version":"4.3.4"},"reference-count":147,"publisher":"MDPI AG","issue":"24","license":[{"start":{"date-parts":[[2023,12,7]],"date-time":"2023-12-07T00:00:00Z","timestamp":1701907200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001659","name":"Deutsche Forschungsgemeinschaft","doi-asserted-by":"publisher","award":["413501650"],"award-info":[{"award-number":["413501650"]}],"id":[{"id":"10.13039\/501100001659","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Cells"],"abstract":"<jats:p>The high prevalence of sarcopenia in an aging population has an underestimated impact on quality of life by increasing the risk of falls and subsequent hospitalization. Unfortunately, the application of the major established key therapeutic\u2014physical activity\u2014is challenging in the immobile and injured sarcopenic patient. Consequently, novel therapeutic directions are needed. The transcription factor Forkhead-Box-Protein O3 (FOXO3) may be an option, as it and its targets have been observed to be more highly expressed in sarcopenic muscle. In such catabolic situations, Foxo3 induces the expression of two muscle specific ubiquitin ligases (Atrogin-1 and Murf-1) via the PI3K\/AKT pathway. In this review, we particularly evaluate the potential of Foxo3-targeted gene therapy. Foxo3 knockdown has been shown to lead to increased muscle cross sectional area, through both the AKT-dependent and -independent pathways and the reduced impact on the two major downstream targets Atrogin-1 and Murf-1. Moreover, a Foxo3 reduction suppresses apoptosis, activates satellite cells, and initiates their differentiation into muscle cells. While this indicates a critical role in muscle regeneration, this mechanism might exhaust the stem cell pool, limiting its clinical applicability. As systemic Foxo3 knockdown has also been associated with risks of inflammation and cancer progression, a muscle-specific approach would be necessary. In this review, we summarize the current knowledge on Foxo3 and conceptualize a specific and targeted therapy that may circumvent the drawbacks of systemic Foxo3 knockdown. This approach presumably would limit the side effects and enable an activity-independent positive impact on skeletal muscle.<\/jats:p>","DOI":"10.3390\/cells12242787","type":"journal-article","created":{"date-parts":[[2023,12,7]],"date-time":"2023-12-07T08:22:59Z","timestamp":1701937379000},"page":"2787","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":51,"title":["Therapeutic Consequences of Targeting the IGF-1\/PI3K\/AKT\/FOXO3 Axis in Sarcopenia: A Narrative Review"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4590-7226","authenticated-orcid":false,"given":"Benjamin","family":"Gellhaus","sequence":"first","affiliation":[{"name":"Department of Trauma, Orthopedics and Reconstructive Surgery, Georg-August University of Goettingen, 37075 Goettingen, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8391-6695","authenticated-orcid":false,"given":"Kai O.","family":"B\u00f6ker","sequence":"additional","affiliation":[{"name":"Department of Trauma, Orthopedics and Reconstructive Surgery, Georg-August University of Goettingen, 37075 Goettingen, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7022-1069","authenticated-orcid":false,"given":"Arndt F.","family":"Schilling","sequence":"additional","affiliation":[{"name":"Department of Trauma, Orthopedics and Reconstructive Surgery, Georg-August University of Goettingen, 37075 Goettingen, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0673-3710","authenticated-orcid":false,"given":"Dominik","family":"Saul","sequence":"additional","affiliation":[{"name":"Department of Trauma, Orthopedics and Reconstructive Surgery, Georg-August University of Goettingen, 37075 Goettingen, Germany"},{"name":"Department of Trauma and Reconstructive Surgery, Eberhard Karls University Tuebingen, BG Trauma Center Tuebingen, 72072 Tuebingen, Germany"},{"name":"Division of Endocrinology, Mayo Clinic, Rochester, MN 55905, USA"},{"name":"Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN 55905, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,12,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"990S","DOI":"10.1093\/jn\/127.5.990S","article-title":"Sarcopenia: Origins and Clinical Relevance","volume":"127","author":"Rosenberg","year":"1997","journal-title":"J. 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