Inhibition of inflammatory CCR2 signaling promotes aged muscle regeneration and strength recovery after injury.

Journal Article (Journal Article)

Muscle regeneration depends on a robust albeit transient inflammatory response. Persistent inflammation is a feature of age-related regenerative deficits, yet the underlying mechanisms are poorly understood. Here, we find inflammatory-related CC-chemokine-receptor 2 (Ccr2) expression in non-hematopoietic myogenic progenitors (MPs) during regeneration. After injury, the expression of Ccr2 in MPs corresponds to the levels of its ligands, the chemokines Ccl2, 7, and 8. We find stimulation of Ccr2-activity inhibits MP fusion and contribution to myofibers. This occurs in association with increases in MAPKp38δ/γ signaling, MyoD phosphorylation, and repression of the terminal myogenic commitment factor Myogenin. High levels of Ccr2-chemokines are a feature of regenerating aged muscle. Correspondingly, deletion of Ccr2 in MPs is necessary for proper fusion into regenerating aged muscle. Finally, opportune Ccr2 inhibition after injury enhances aged regeneration and functional recovery. These results demonstrate that inflammatory-induced activation of Ccr2 signaling in myogenic cells contributes to aged muscle regenerative decline.

Full Text

Duke Authors

Cited Authors

  • Blanc, RS; Kallenbach, JG; Bachman, JF; Mitchell, A; Paris, ND; Chakkalakal, JV

Published Date

  • August 20, 2020

Published In

Volume / Issue

  • 11 / 1

Start / End Page

  • 4167 -

PubMed ID

  • 32820177

Pubmed Central ID

  • PMC7441393

Electronic International Standard Serial Number (EISSN)

  • 2041-1723

Digital Object Identifier (DOI)

  • 10.1038/s41467-020-17620-8

Language

  • eng

Conference Location

  • England