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Imaging the noncentrosymmetric structural organization of tendon with Interferometric Second Harmonic Generation microscopy. 2014
Maxime Rivard, and
Konstantin Popov, and
Charles-André Couture, and
Mathieu Laliberté, and
Antony Bertrand-Grenier, and
François Martin, and
Henri Pépin, and
Christian P Pfeffer, and
Cameron Brown, and
Lora Ramunno, and
François Légaré
Institut National de la Recherche Scientifique, Centre Énergie Matériaux Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes, QC, J3X1S2, Canada.
We report the imaging of tendon with Interferometric Second Harmonic Generation microscopy. We observe that the noncentrosymmetric structural organization can be maintained along the fibrillar axis over more than 150 μm, while in the transverse direction it is ∼1-15 μm. Those results are explained by modeling tendon as a heterogeneous distribution of noncentrosymmetric nano-cylinders (collagen fibrils) oriented along the fibrillar axis. The preservation of the noncentrosymmetric structural organization over multiple tens of microns reveals that tendon is made of domains in which the ratio between fibrils with positive and negative polarity is unbalanced.
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