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Updated: May 20, 2026

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Polarization-resolved second-harmonic generation in tendon upon mechanical stretching.

Ivan Gusachenko1, Viet Tran, Yannick Goulam Houssen

  • 1Laboratory for Optics and Biosciences, Ecole Polytechnique, Centre National de la Recherche Scientifique, Institut National de la Santé et de la Recherche Médicale U696, Palaiseau, France.

Biophysical Journal
|July 25, 2012
PubMed
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Second-harmonic generation (SHG) microscopy reveals collagen fibril alignment during tendon stretching. This study links micrometer-scale disorder to macroscopic biomechanical properties, confirming theoretical models.

Area of Science:

  • Biophysics
  • Materials Science
  • Optical Imaging

Background:

  • Collagen, a triple-helical protein, dictates tissue biomechanics and forms macromolecular structures.
  • Second-harmonic generation (SHG) microscopy is crucial for visualizing collagen fibril organization.

Purpose of the Study:

  • To theoretically and experimentally investigate how collagen fibril distribution impacts polarization-resolved SHG anisotropy.
  • To correlate microscopic collagen rearrangement with macroscopic biomechanical responses in tendons.

Main Methods:

  • Utilized a multiscale nonlinear optical formalism for theoretical analysis.
  • Implemented polarization-resolved SHG microscopy combined with mechanical assays on rat-tail tendon.

Main Results:

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  • Theoretical evidence shows SHG anisotropy primarily reflects micrometer-scale disorder in collagen fibril distribution.
  • Experimental results confirm that tendon stretching aligns collagen fibrils, decreasing SHG anisotropy.
  • Measured the nonlinear optical response of aligned fibrils, agreeing with theoretical hyperpolarizability calculations.

Conclusions:

  • Polarization-resolved SHG microscopy effectively probes collagen fibril organization and its relation to tissue mechanics.
  • Tendon stretching induces collagen fibril alignment, providing insights into tissue adaptation.
  • The study validates theoretical models of collagen's nonlinear optical properties.