From molecular structure to tissue architecture: collagen organization probed by SHG microscopy

Authors

  • Riccardo Cicchi,

    Corresponding author
    1. European Laboratory for Non-linear Spectroscopy LENS, Via Nello Carrara 1, 50019 Sesto Fiorentino, Italy
    2. National Institute of Optics, National Research Council INO-CNR, Largo E. Fermi 6, 50125 Florence, Italy
    • Phone: +39 055 457 2476, Fax: +39 055 457 2451
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  • Nadine Vogler,

    1. Institute of Photonic Technology Jena IPHT, Albert Einstein Straße 9, 07745 Jena, Germany
    2. Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller University, Helmholtzweg 4, 07743 Jena, Germany
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  • Dimitrios Kapsokalyvas,

    1. National Institute of Optics, National Research Council INO-CNR, Largo E. Fermi 6, 50125 Florence, Italy
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  • Benjamin Dietzek,

    1. Institute of Photonic Technology Jena IPHT, Albert Einstein Straße 9, 07745 Jena, Germany
    2. Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller University, Helmholtzweg 4, 07743 Jena, Germany
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  • Jürgen Popp,

    1. Institute of Photonic Technology Jena IPHT, Albert Einstein Straße 9, 07745 Jena, Germany
    2. Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller University, Helmholtzweg 4, 07743 Jena, Germany
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  • Francesco Saverio Pavone

    1. European Laboratory for Non-linear Spectroscopy LENS, Via Nello Carrara 1, 50019 Sesto Fiorentino, Italy
    2. Department of Physics, University of Florence, Via G. Sansone 1, 50019 Sesto Fiorentino, Italy
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Abstract

Second-harmonic generation (SHG) microscopy is a fantastic tool for imaging collagen and probing its hierarchical organization from molecular scale up to tissue architectural level. In fact, SHG combines the advantages of a non-linear microscopy approach with a coherent modality able to probe molecular organization. In this manuscript we review the physical concepts describing SHG from collagen, highlighting how this optical process allows to probe structures ranging from molecular sizes to tissue architecture, through image pattern analysis and scoring methods. Starting from the description of the most relevant approaches employing SHG polarization anisotropy and forward – backward SHG detection, we then focus on the most relevant methods for imaging and characterizing collagen organization in tissues through image pattern analysis methods, highlighting advantages and limitations of the methods applied to tissue imaging and to potential clinical applications. (© 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

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