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Imaging horse tendons using multimodal 2-photon microscopy.

Mayandi Sivaguru¹, John Paul Eichorst¹, Sushmitha Durgam²

¹Institute for Genomic Biology, University of Illinois Urbana-Champaign, 1206 West Gregory Drive, Urbana, IL 61801, USA.

Methods (San Diego, Calif.)

|July 23, 2013

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Understanding how cells respond to mechanical forces during tendon repair is key for effective treatment. This study uses advanced imaging to map the cellular environment in injured horse tendons, revealing insights into load-dependent healing.

Area of Science:

Biomedical Engineering
Cellular Biology
Veterinary Medicine

Background:

Tendon injuries affect athletes, with recovery depending critically on mechanical stimulation.
Current treatments lack precise loading guidelines, risking detrimental outcomes from too much or too little load.
Understanding cellular responses to mechanical cues is vital for optimizing tendon repair strategies.

Purpose of the Study:

To investigate the local mechanical environment of cells within normal and injured equine tendons.
To analyze how different mechanical loads influence cellular behavior and collagen structure during tendon healing.
To explore the application of advanced imaging techniques for detailed tendon injury analysis.

Main Methods:

Utilized various 2-photon-based imaging techniques to examine cellular mechanics in tendon tissues.

Keywords:

2-Photon fluorescence microscopy Cell/nuclear morphometric analysis and quantification Collagen fiber organization Fluorescence lifetime imaging microscopy Horse tendons Second-harmonic generation microscopy

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Published on: December 20, 2021

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Last Updated: May 9, 2026

In Vivo Two-Photon Microscopy of Single Nerve Endings in Skin

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Published on: August 24, 2014

In vivo Imaging of Biological Tissues with Combined Two-Photon Fluorescence and Stimulated Raman Scattering Microscopy

In vivo Imaging of Biological Tissues with Combined Two-Photon Fluorescence and Stimulated Raman Scattering Microscopy

Published on: December 20, 2021

Chemically induced varying degrees of tendon injury and, in some cases, introduced stem cells.

Employed 2-photon Fluorescence Lifetime Imaging (FLIM) for enhanced analysis of nuclear microenvironments.

Main Results:

Distinguished cell nuclei morphologies and collagen alignment with high contrast and resolution.
Identified novel features in the nuclear local environment using 2-photon FLIM, not visible with steady-state imaging.
Provided detailed analysis of horse tendon injury patterns and cellular responses.

Conclusions:

Advanced 2-photon imaging modalities offer valuable insights into the mechanical environment of cells in injured tendons.
This research contributes to a fundamental understanding of how cells translate mechanical signals during tendon repair.
Findings support the development of more effective, load-specific treatments for tendon injuries in both humans and animals.