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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
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Metabolic Characterization of Polarized M1 and M2 Bone Marrow-derived Macrophages Using Real-time Extracellular Flux Analysis
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Substrate Curvature Influences Cytoskeletal Rearrangement and Modulates Macrophage Phenotype.

Austin Sovar, Matthew Patrick, Ramkumar T Annamalai

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    Substrate curvature, a physical cue, effectively regulates macrophage immunophenotype by altering cytoskeletal dynamics. This localized approach offers a novel strategy for treating inflammatory diseases without systemic side effects.

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    Area of Science:

    • Biophysics
    • Immunology
    • Cell Biology

    Background:

    • Inflammation is a defense mechanism that can cause chronic diseases when dysregulated.
    • Macrophages are key immune cells that shift phenotypes (M1 to M2) to resolve inflammation.
    • Current treatments for macrophage modulation have systemic side effects.

    Purpose of the Study:

    • To investigate substrate curvature as a localized biophysical cue to regulate macrophage immunophenotype.
    • To explore the role of F-actin polymerization in curvature-mediated macrophage responses.
    • To develop a localized immunomodulatory strategy for inflammatory diseases.

    Main Methods:

    • Fabrication of spherical microgels with tunable curvatures.
    • Characterization of microgel biophysical properties.
    • Assessment of macrophage adhesion, F-actin dynamics, and immunophenotype on microgels.
    • Selective inhibition of actin polymerization to study cytoskeletal influence.

    Main Results:

    • Macrophages adhered to microgels regardless of curvature.
    • Substrate curvature significantly altered macrophage F-actin dynamics.
    • Modulating cytoskeletal dynamics partially reversed curvature-induced phenotypic changes.
    • Substrate curvature influences macrophage behavior and immunophenotype.

    Conclusions:

    • Substrate curvature is a critical biophysical cue that modulates macrophage cytoskeletal dynamics and immunophenotype.
    • This approach offers a localized strategy for immunomodulation, potentially minimizing systemic side effects.
    • Curvature-mediated regulation of macrophage phenotype presents a novel therapeutic avenue for inflammatory conditions.