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Modulation of macrophage phenotype by cell shape.

Frances Y McWhorter1, Tingting Wang, Phoebe Nguyen

  • 1Departments of Biomedical Engineering and Chemical Engineering and Materials Science, and The Edwards Lifesciences Center for Advanced Cardiovascular Technology, University of California, Irvine, CA 92697.

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Summary

Macrophage cell shape directly influences their function. Elongated shapes promote M2 prohealing phenotypes, while M1 proinflammatory phenotypes are associated with different shapes, impacting tissue repair and inflammation.

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Area of Science:

  • Cell Biology
  • Immunology
  • Biomaterials

Background:

  • Macrophage polarization into M1 (proinflammatory) and M2 (prohealing) phenotypes is crucial for tissue homeostasis.
  • While soluble factors are well-studied, the impact of physical cues like cell shape on macrophage polarization remains largely unexplored.

Purpose of the Study:

  • To investigate the direct role of macrophage cell shape in modulating M1 vs. M2 polarization.
  • To determine if physical cues, independent of soluble factors, can dictate macrophage phenotype.

Main Methods:

  • Utilized micropatterning techniques to precisely control macrophage cell geometry.
  • Assessed M1/M2 marker expression and cytokine secretion in response to defined shapes.
  • Investigated the involvement of the cytoskeleton and contractility using pharmacological inhibitors.

Main Results:

  • Macrophage elongation directly induced M2 phenotype markers and reduced inflammatory cytokine secretion.
  • Elongation enhanced responses to M2-polarizing cytokines and conferred resistance to M1-inducing stimuli.
  • Inhibition of actin-cytoskeleton contractility abrogated shape-induced polarization.

Conclusions:

  • Cell shape is a significant physical cue that can independently drive macrophage polarization towards an M2 phenotype.
  • The cytoskeleton plays a critical role in mediating mechanotransduction for shape-dependent macrophage activation.
  • ECM architecture and resulting cell shape changes may be integral regulators of macrophage function in vivo.