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Mechanical changes of peripheral nerve tissue microenvironment and their structural basis during development.

Gonzalo Rosso, Jochen Guck

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    Peripheral nerve stiffness varies with development, influenced by microtubules and collagen, not cell density. This reveals the mechanical microenvironment crucial for nerve development and regeneration therapies.

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    Area of Science:

    • Biomedical Engineering
    • Neuroscience
    • Biophysics

    Background:

    • Peripheral nerves face mechanical stress during growth and movement.
    • Understanding nerve biomechanics and microstructure during development is limited.

    Purpose of the Study:

    • To investigate the elastic modulus of peripheral nerve tissue during development.
    • To correlate biomechanical properties with histological microstructure.
    • To identify key cellular and extracellular contributors to nerve mechanics.

    Main Methods:

    • Atomic force microscopy (AFM) used on ex vivo peripheral nerve cross sections.
    • Analysis of elastic modulus at distinct developmental stages.
    • Correlation of mechanical data with cellular and extracellular microstructure.

    Main Results:

    • Nerve tissue stiffness is spatially heterogeneous and changes biphasically during maturation.
    • Intracellular microtubules and extracellular collagens (Type I and IV) significantly contribute to nerve biomechanics.
    • Cellular density and myelin content were not major contributors, unlike in the central nervous system.

    Conclusions:

    • Characterized the mechanical microenvironment of peripheral nerves during development.
    • Provides insights into Schwann cell and neuron mechanosensing mechanisms.
    • Informs the design of artificial nerve scaffolds for regenerative medicine.