Matrix metalloproteinase-2 plays a critical role in overload induced skeletal muscle hypertrophy

Qia Zhang, Sunil K. Joshi, David H. Lovett, Bryon Zhang, Sue Bodine, Hubert Kim, Xuhui Liu

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Background: extracellular matrix (ECM) components are instrumental in maintaining homeostasis and muscle fiber functional integrity. Skeletal muscle hypertrophy is associated with ECM remodeling. Specifically, recent studies have reported the involvement of matrix metalloproteinases (MMPs) in muscle ECM remodeling. However, the functional role of MMPs in muscle hypertrophy remains largely unknown.Methods: in this study, we examined the role of MMP-2 in skeletal muscle hypertrophy using a previously validated method where the plantaris muscle of mice were subjected to mechanical overload due to the surgical removal of synergist muscles (gastrocnemius and soleus).Results: following two weeks of overload, we observed a significant increase in MMP-2 activity and up-regulation of ECM components and remodeling enzymes in the plantaris muscles of wild-type mice. However, MMP-2 knockout mice developed significantly less hypertrophy and ECM remodeling in response to overload compared to their wild-type littermates. Investigation of protein synthesis rate and Akt/mTOR signaling revealed no difference between wild-type and MMP-2 knockout mice, suggesting that a difference in hypertrophy was independent of protein synthesis.Conclusion: taken together, our results suggest that MMP-2 is a key mediator of ECM remodeling in the setting of skeletal muscle hypertrophy.

Original languageEnglish (US)
Pages (from-to)362-370
Number of pages9
JournalMuscles, Ligaments and Tendons Journal
Volume4
Issue number3
DOIs
StatePublished - Jul 1 2014

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Keywords

  • Basement membrane
  • Extracellular matrix
  • Matrix metalloproteinase-2
  • Skeletal muscle hypertrophy
  • Synergistic ablation

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

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