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Milliscale Substrate Curvature Promotes Myoblast Self-Organization and Differentiation.

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Milliscale curvature significantly impacts cell behavior, influencing myoblast migration, alignment, and differentiation. This suggests shared mechanotransduction pathways for curvature and compliance, crucial for tissue engineering and biomaterial design.

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Area of Science:

  • Biomaterials Science
  • Cell Biology
  • Tissue Engineering

Background:

  • Biological tissues possess complex structures influencing cell behavior through sensing and transduction.
  • The impact of milliscale (tissue-size) curvature on cell behavior is often underestimated, despite nonplanar tissue geometries.

Purpose of the Study:

  • To investigate the effects of concave, hemicylinder-shaped surfaces (3-50 mm diameter) on C2C12 myoblast migration, proliferation, orientation, and differentiation.
  • To explore the relationship between substrate curvature and cell behavior, particularly in the context of mechanotransduction.

Main Methods:

  • Culturing C2C12 myoblasts on concave hemicylinder surfaces of varying diameters (3-50 mm).
  • Analyzing cell migration, proliferation, orientation, and differentiation.
  • Comparing cellular responses on curved substrates versus planar substrates.

Main Results:

  • Milliscale curvature significantly affects cell responses compared to planar substrates.
  • Myoblasts on surfaces with 7.5-15 mm diameters exhibited enhanced migration and alignment parallel to the curvature axis.
  • These curvature ranges promoted myoblast differentiation and the formation of dense, oriented multinucleated myotubes.

Conclusions:

  • Cellular responses to substrate curvature are mediated by mechanotransduction signaling, similar to responses to substrate compliance.
  • Modulating substrate curvature and/or compliance offers a method to control cell behavior.
  • Findings are relevant for understanding muscle tissue formation/healing and for designing improved biomaterials and cell-surface interfaces.