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Biofunctional hydrogels for skeletal muscle constructs.

Apoorva S Salimath1, Andrés J García1

  • 1George W. Woodruff School of Mechanical Engineering, Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA, USA.

Journal of Tissue Engineering and Regenerative Medicine
|March 12, 2014
PubMed
Summary

Engineered synthetic hydrogels promote skeletal muscle regeneration. Optimized poly(ethylene glycol) (PEG) hydrogels with specific ligands significantly enhanced cell attachment, proliferation, and differentiation into functional muscle tissue constructs.

Keywords:
biomaterialmicroenvironmentmyoblastmyogenic differentiationrepairsarcomeric myosin

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Tissue Engineering

Background:

  • Previous research on skeletal muscle regeneration often used 2D models or natural hydrogels, limiting control over myogenic differentiation.
  • A comprehensive understanding of scaffold properties and biological functionalization is crucial for developing effective in vitro muscle constructs.

Purpose of the Study:

  • To identify key properties of functionalized poly(ethylene glycol)-maleimide (PEG-MAL) synthetic hydrogels that promote C2C12 cell attachment, proliferation, and differentiation.
  • To engineer a 3D microenvironment that supports the formation of multinucleated myotubes and functional skeletal muscle tissue.

Main Methods:

  • Investigated the impact of cell seeding density, polymer weight percentage, and bioadhesive ligands on myoblast viability and differentiation.
  • Optimized PEG hydrogel formulations (5% w/v) functionalized with RGD peptide and protease-cleavable crosslinkers were used for differentiation assays.
  • Assessed the expression of skeletal muscle markers, multinucleation, and nuclei count per cell.

Main Results:

  • Optimized PEG hydrogels significantly increased skeletal muscle marker expression by 50%, multinucleated cells by 17%, and nuclei per differentiated cell by 40%.
  • Functional assessment showed a 20% decrease in hydrogel length upon contractile agent stimulation, indicating functional tissue formation.
  • Identified specific hydrogel properties that enhance cell survival and promote myotube development.

Conclusions:

  • Synthetic PEG-MAL hydrogels can be engineered to create a 3D microenvironment that effectively promotes skeletal muscle progenitor cell differentiation.
  • The study provides strategies for developing controllable and functional in vitro skeletal muscle tissue constructs for regenerative medicine applications.
  • Optimized hydrogel formulations enhance cell viability and drive the formation of contractile muscle units.