Cited by 97Exercise and Physiological ResponsesMuscle Physiology and DisordersCardiovascular and exercise physiology

Human skeletal muscle macrophages increase following cycle training and are associated with adaptations that may facilitate growth

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Walton, R. Grace, Kosmac, Kate, Mula, Jyothi, Fry, Christopher S., Peck, Bailey D., Groshong, Jason S., Finlin, Brian S., Zhu, Beibei +2 more·2019·Scientific Reports

Abstract

Skeletal muscle macrophages participate in repair and regeneration following injury. However, their role in physiological adaptations to exercise is unexplored. We determined whether endurance exercise training (EET) alters macrophage content and characteristics in response to resistance exercise (RE), and whether macrophages are associated with other exercise adaptations. Subjects provided vastus lateralis biopsies before and after one bout of RE, after 12 weeks of EET (cycling), and after a final bout of RE. M2 macrophages (CD11b+/CD206+) did not increase with RE, but increased in response to EET (P < 0.01). Increases in M2 macrophages were positively correlated with fiber hypertrophy (r = 0.49) and satellite cells (r = 0.47). M2c macrophages (CD206+/CD163+) also increased following EET (P < 0.001), and were associated with fiber hypertrophy (r = 0.64). Gene expression was quantified using NanoString. Following EET, the change in M2 macrophages was positively associated with changes in HGF, IGF1, and extracellular matrix genes. EET decreased expression of IL6 (P < 0.05), C/EBPβ (P < 0.01), and MuRF (P < 0.05), and increased expression of IL-4 (P < 0.01), TNFα (P < 0.01) and the TWEAK receptor FN14 (P < 0.05). The change in FN14 gene expression was inversely associated with changes in C/EBPβ (r = -0.58) and MuRF (r = -0.46) following EET. In cultured human myotubes, siRNA inhibition of FN14 increased expression of C/EBPβ (P < 0.05) and MuRF (P < 0.05). Our data suggest that macrophages contribute to the muscle response to EET, potentially including modulation of TWEAK-FN14 signaling.

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  • Twelve weeks of endurance exercise training composed of cycling 3 d·wk−1 at a target intensity corresponding to 65% V O2max increased M2 macrophage abundance in human skeletal muscle.

    “Twelve weeks of endurance exercise training composed of cycling 3 d·wk−1 at a target intensity corresponding to 65% V O2max increased M2 macrophage abundance in human skeletal muscle, suggesting that adaptive changes to training may reduce local inflammation (40).”

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Authors
Walton, R. G., Kosmac, K., Mula, J., Fry, C. S., Peck, B. D., Groshong, J. S., Finlin, B. S., Zhu, B., Kern, P. A., & Peterson, C. A.
Affiliations
  • University of Kentucky (US)
  • The University of Texas Medical Branch at Galveston (US)
  • University of Central Florida (US)
Corresponding author
Walton, R. Grace
Venue
Scientific Reports
Published
2019-01-30
Volume
9
Issue
1
Pages
969-969
ISSN
2045-2322 (ISSN-L)
OpenAlex
W2911336809
Cited by
97
References
88
Citations by year
2026: 10 · 2025: 12 · 2024: 17 · 2023: 7 · 2022: 13 · 2021: 16 · 2020: 13 · 2019: 9
FWCI
8.91
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, other-oa)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • UKnowledge (University of Kentucky) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
  • U.S. Department of Health &amp; Human Services | NIH | National Institute of Diabetes and Digestive and Kidney Diseases (071349)
  • U.S. Department of Health &amp; Human Services | NIH | National Center for Advancing Translational Sciences (UL1TR001998)
  • U.S. Department of Health &amp; Human Services | NIH | National Institute on Aging (046920)
Topics
  • Health Sciences › Medicine › Rehabilitation › Exercise and Physiological Responses
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
Keywords
endurance training, resistance training, M2 macrophages, M2c macrophages, muscle fiber hypertrophy, satellite cells, Fn14, C/EBPβ, MurF, interleukin-6, insulin-like growth factor I, extracellular matrix, muscle growth, vastus lateralis
MeSH terms
Adaptation, Physiological, Adult, Aged, Female, Fibronectins, Gene Expression Regulation, Humans, Inflammation, Macrophages, Male, Middle Aged, Muscle Proteins, Physical Endurance, Muscle, Skeletal, Muscle Fibers, Skeletal, CCAAT-Enhancer-Binding Protein-beta, Satellite Cells, Skeletal Muscle, Resistance Training

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