{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,24]],"date-time":"2026-08-24T12:25:28Z","timestamp":1787574328942,"version":"build-2736575974"},"reference-count":161,"publisher":"MDPI AG","issue":"17","license":[{"start":{"date-parts":[[2026,8,22]],"date-time":"2026-08-22T00:00:00Z","timestamp":1787356800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Guangdong Provincial Higher Education Key Field Project in Biomedicine and Health","award":["2024ZDZX2063"],"award-info":[{"award-number":["2024ZDZX2063"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Int. J. Mol. Sci.","IJMS"],"abstract":"<jats:p>Regular exercise mediates inter-tissue communication between skeletal muscle and the immune system through skeletal muscle-derived secretory factors, providing an important molecular basis for the beneficial effects of exercise on chronic inflammation, metabolic dysregulation, and impaired tissue repair. As key effector cells of the innate immune system, macrophages do not simply conform to a dichotomous classification of classically activated M1 macrophages and alternatively activated M2 macrophages; rather, their functional states constitute a dynamic spectrum shaped by exercise load, recovery time window, tissue microenvironment, and disease context. This review focuses on recent advances in exercise-induced skeletal muscle secretory factors involved in macrophage functional remodeling. Representative signals, including interleukin-6 (IL-6), irisin, meteorin-like protein (METRNL), fibroblast growth factor 21 (FGF21), oncostatin M (OSM), decorin, myostatin, chemokines, and extracellular vesicles, are systematically summarized in terms of their exercise responsiveness, evidence for skeletal muscle origin, and evidence supporting macrophage regulation. Based on these dimensions, an evidence-strength grading framework is further proposed. Moreover, this review integrates key signaling axes, including glycoprotein 130 (gp130)\/Janus kinase (JAK)\/signal transducer and activator of transcription (STAT), signal transducer and activator of transcription 6 (STAT6)\/peroxisome proliferator-activated receptor gamma (PPAR\u03b3), AMP-activated protein kinase (AMPK)\/nuclear factor erythroid 2-related factor 2 (Nrf2)\/nuclear factor kappa B (NF-\u03baB), transforming growth factor beta (TGF-\u03b2)\/Smad, and chemokine receptor pathways, to explain how exercise-induced secretory networks participate in the dynamic regulation of the macrophage functional spectrum through immune cell recruitment, inflammatory clearance, immunometabolic reprogramming, matrix remodeling, and repair-niche formation. Current evidence indicates the translational potential of exercise-induced skeletal muscle secretory factors in skeletal muscle repair, metabolic inflammation, aging-related functional decline, and cancer rehabilitation. However, this field still faces several major challenges, including insufficient tracing of skeletal muscle-derived signals, limited direct causal validation, a lack of human tissue-level evidence, and unclear exercise dose\u2013response relationships. Future studies should combine tissue-specific genetic interventions, receptor blockade, single-cell and spatial omics, metabolic flux analysis, and standardized human exercise interventions to further clarify the mechanistic basis and application boundaries of exercise-induced skeletal muscle\u2013macrophage communication, thereby providing a theoretical foundation for precision exercise prescription and chronic inflammation intervention.<\/jats:p>","DOI":"10.3390\/ijms27177527","type":"journal-article","created":{"date-parts":[[2026,8,24]],"date-time":"2026-08-24T11:47:19Z","timestamp":1787572039000},"page":"7527","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Exercise-Induced Skeletal Muscle Secretory Factors and Macrophage Functional Remodeling: Mechanistic Advances"],"prefix":"10.3390","volume":"27","author":[{"given":"Ziyan","family":"Li","sequence":"first","affiliation":[{"name":"School of Sport and Health, Guangzhou Sport University, Guangzhou 510500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chenyu","family":"Lin","sequence":"additional","affiliation":[{"name":"School of Sport and Health, Guangzhou Sport University, Guangzhou 510500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-1991-8914","authenticated-orcid":false,"given":"Linjia","family":"Tang","sequence":"additional","affiliation":[{"name":"School of Sport and Health, Guangzhou Sport University, Guangzhou 510500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yiyao","family":"Xu","sequence":"additional","affiliation":[{"name":"School of Sport and Health, Guangzhou Sport University, Guangzhou 510500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jieming","family":"Liang","sequence":"additional","affiliation":[{"name":"School of Sport and Health, Guangzhou Sport University, Guangzhou 510500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dehui","family":"Pan","sequence":"additional","affiliation":[{"name":"School of Sport and Health, Guangzhou Sport University, Guangzhou 510500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ziran","family":"Huang","sequence":"additional","affiliation":[{"name":"School of Sport and Health, Guangzhou Sport University, Guangzhou 510500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xianyan","family":"Xie","sequence":"additional","affiliation":[{"name":"School of Sport and Health, Guangzhou Sport University, Guangzhou 510500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yu","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Sport and Health, Guangzhou Sport University, Guangzhou 510500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuqi","family":"Qin","sequence":"additional","affiliation":[{"name":"School of Sport and Health, Guangzhou Sport University, Guangzhou 510500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gaoyuan","family":"Yang","sequence":"additional","affiliation":[{"name":"School of Sport and Health, Guangzhou Sport University, Guangzhou 510500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaoguang","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Sport and Health, Guangzhou Sport University, Guangzhou 510500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Huiguo","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Sport and Health, Guangzhou Sport University, Guangzhou 510500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,8,22]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"273","DOI":"10.1038\/s41574-022-00641-2","article-title":"Exerkines in health, resilience and disease","volume":"18","author":"Chow","year":"2022","journal-title":"Nat. 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