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Icing after skeletal muscle injury decreases M1 macrophage accumulation and TNF-α expression during the early phase of muscle regeneration in rats

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Abstract

Following skeletal muscle injury, both myogenic and immune cells interact closely during the regenerative process. Although icing is still a common acute treatment for sports-related skeletal muscle injuries, icing after muscle injury has been shown to disrupt macrophage accumulation and impair muscle regeneration in animal models. However, it remains unknown whether icing shortly after injury affects macrophage-related phenomena during the early stages of muscle regeneration. Therefore, we focused on the distribution of M1/M2 macrophages and cytokines expressed predominantly by macrophages during the early stages of muscle regeneration after muscle crush injury. Icing resulted in a decrease, not retardation, in the accumulation of M1 macrophages, but not M2 macrophages, in injured muscles. Consistent with the decrease in M1 macrophage accumulation, icing led to a reduction, instead of delay, in the level of tumor necrosis factor-α (TNF-α) expression. Additionally, at subsequent timepoints, icing decreased the number of myogenic precursor cells in the regenerating area and the size of centrally nucleated regenerating myofibers. Together, our findings suggest that icing after acute muscle damage by crushing disturbs muscle regeneration through hindering tM1 macrophage-related phenomena.

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The datasets analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors thank the members of our laboratory for cooperation. We also would like to thank Enago (www.enago.jp) for the English language review.

Funding

Financial support for this study was provided by JSPS KAKENHI (grant number 21K11238).

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Contributions

Conceptualization: AM, MK, and TA; methodology: AM, MK, MMiyakawa, MS, and TA; formal analysis and investigation: AM, MK, IN, MMiyakawa, MMiyoshi, TSakuraya, and TSonomura; writing—original draft preparation: AM; writing—review and editing: AM, MK, IN, and TA; funding acquisition: TA; supervision: TA All authors read and approved the final manuscript.

Corresponding author

Correspondence to Takamitsu Arakawa.

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The authors declare no conflicts of interest.

Ethical approval

This study was approved by the Institutional Animal Care and Use Committee and was conducted in accordance with the Kobe University Animal Experimentation Regulations (approval numbers P180706 and P200906).

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N/a (animal experiment).

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Miyazaki, A., Kawashima, M., Nagata, I. et al. Icing after skeletal muscle injury decreases M1 macrophage accumulation and TNF-α expression during the early phase of muscle regeneration in rats. Histochem Cell Biol 159, 77–89 (2023). https://doi.org/10.1007/s00418-022-02143-8

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  • DOI: https://doi.org/10.1007/s00418-022-02143-8

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