Cited by 94Muscle Physiology and DisordersExtracellular vesicles in diseaseMuscle metabolism and nutrition

Fusion-independent satellite cell communication to muscle fibers during load-induced hypertrophy

Open access
Murach, Kevin A, Vechetti, Ivan J, Van Pelt, Douglas W, Crow, Samuel E, Dungan, Cory M, Figueiredo, Vandre C, Kosmac, Kate, Fu, Xu +4 more·2020·Function

Abstract

Abstract The “canonical” function of Pax7+ muscle stem cells (satellite cells) during hypertrophic growth of adult muscle fibers is myonuclear donation via fusion to support increased transcriptional output. In recent years, however, emerging evidence suggests that satellite cells play an important secretory role in promoting load-mediated growth. Utilizing genetically modified mouse models of delayed satellite cell fusion and in vivo extracellular vesicle (EV) tracking, we provide evidence for satellite cell communication to muscle fibers during hypertrophy. Myogenic progenitor cell-EV-mediated communication to myotubes in vitro influences extracellular matrix (ECM)-related gene expression, which is congruent with in vivo overload experiments involving satellite cell depletion, as well as in silico analyses. Satellite cell-derived EVs can transfer a Cre-induced, cytoplasmic-localized fluorescent reporter to muscle cells as well as microRNAs that regulate ECM genes such as matrix metalloproteinase 9 (Mmp9), which may facilitate growth. Delayed satellite cell fusion did not limit long-term load-induced muscle hypertrophy indicating that early fusion-independent communication from satellite cells to muscle fibers is an underappreciated aspect of satellite cell biology. We cannot exclude the possibility that satellite cell-mediated myonuclear accretion is necessary to maintain prolonged growth, specifically in the later phases of adaptation, but these data collectively highlight how EV delivery from satellite cells can directly contribute to mechanical load-induced muscle fiber hypertrophy, independent of cell fusion to the fiber.

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Crossref · 10.1093/function/zqaa009

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  • This facilitates an explosive re-accumulation of translational capacity, a process further optimized by early, fusion-independent communication from resident satellite cells that creates a highly permissive environment for long-term growth.

    “This facilitates an explosive re-accumulation of translational capacity, a process further optimized by early, fusion-independent communication from resident satellite cells that creates a highly permissive environment for long-term growth [122,123,124].”

    From Ribosome Biogenesis as a Putative Bottleneck to Skeletal Muscle Hypertrophy: Mechanisms, Human Evidence, and Practical Modulators (2026) · cites this paper as [123]

    The Results section (‘Delayed Satellite Cell Fusion Does Not Inhibit Long-Term Muscle Hypertrophy’; page unavailable) says that satellite-cell secretory products delivered early during loading may promote prolonged growth without early fusion. The paper does not establish explosive re-accumulation of translational capacity or show that this communication optimizes that process; it discusses extracellular-matrix-related signaling instead. (LLM, conf=0.86)

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Authors
Murach, K. A., Vechetti, I. J., Van Pelt, D. W., Crow, S. E., Dungan, C. M., Figueiredo, V. C., Kosmac, K., Fu, X., Richards, C. I., Fry, C. S., McCarthy, J. J., & Peterson, C. A.
Affiliations
  • University of Kentucky (US)
  • The Center for Muscle Biology, University of Kentucky, Lexington, KY 40536, USA
Corresponding author
Peterson, Charlotte A
Venue
Function
Published
2020-01-01
Volume
1
Issue
1
Pages
zqaa009-zqaa009
ISSN
2633-8823 (ISSN-L)
OpenAlex
W3038607983
Cited by
94
References
147
Citations by year
2026: 10 · 2025: 16 · 2024: 14 · 2023: 15 · 2022: 11 · 2021: 21 · 2020: 7
FWCI
4.38
Type
journal article
Language
en
Open access
Locations
  • Function (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • NIH
  • National Institute on Aging (AG049086)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK119619)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Extracellular vesicles in disease
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
Keywords
satellite cells, muscle hypertrophy, extracellular vesicles, Pax7, extracellular matrix, microRNA, MMP-9, mechanical loading, myogenic progenitor cells, myonuclear accretion
MeSH terms
Animals, Cell Communication, Disease Models, Animal, Extracellular Matrix, Hypertrophy, Muscle Fibers, Skeletal, Mice

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