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The Extracellular Matrix01:42

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In order to maintain tissue organization, many animal cells are surrounded by structural molecules that make up the extracellular matrix (ECM). Together, the molecules in the ECM maintain the structural integrity of tissue as well as the remarkable specific properties of certain tissues.
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Unlike epithelial tissue, which is composed of cells closely packed with little or no extracellular space in between, connective tissue cells are dispersed in a matrix. This extracellular matrix (ECM) is composed of fibrous proteins like collagen, elastin, and fibronectin in a ground substance consisting of interstitial fluid, cell adhesion proteins, and proteoglycans. The proteoglycans form a gel-like material in the spaces between cells and provide hydration, buffering, binding, and force...
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Optical Microscopy and the Extracellular Matrix Structure: A Review.

Joshua J A Poole1, Leila B Mostaço-Guidolin1

  • 1Department of Systems and Computer Engineering, Faculty of Engineering and Design, Carleton University 1125 Colonel By Drive, Ottawa, ON K1S 5B6, Canada.

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Biological tissues contain extracellular matrix (ECM) crucial for structure and function. This review details optical microscopy techniques for visualizing ECM components and their role in tissue remodeling and fibrotic diseases.

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Area of Science:

  • Biomedical Engineering
  • Cell Biology
  • Microscopy

Background:

  • Biological tissues comprise cells and a significant extracellular matrix (ECM).
  • The ECM provides structural and functional integrity to tissues and organs.
  • Understanding cell-ECM interactions is vital for tissue formation, remodeling, and fibrotic diseases.

Purpose of the Study:

  • To review optical imaging microscopy modalities for characterizing ECM components.
  • To provide examples of applications for various microscopy techniques in ECM research.

Main Methods:

  • Widefield fluorescence microscopy
  • Total internal reflection fluorescence microscopy
  • Laser scanning confocal microscopy
  • Multipoint/slit confocal microscopy
  • Two-photon excited fluorescence (TPEF)
  • Second and third harmonic generation (SHG, THG)
  • Coherent anti-Stokes Raman scattering (CARS)
  • Fluorescence lifetime imaging microscopy (FLIM)
  • Structured illumination microscopy (SIM)
  • Stimulated emission depletion microscopy (STED)
  • Ground-state depletion microscopy (GSD)
  • Photoactivated localization microscopy (PALM/fPALM)

Main Results:

  • The review details a wide array of optical microscopy techniques applicable to ECM visualization.
  • Each technique offers distinct advantages and limitations for studying ECM structure and dynamics.
  • Examples of applications demonstrate the utility of these methods in understanding tissue microenvironments.

Conclusions:

  • Optical microscopy is essential for visualizing ECM components and their role in tissue health and disease.
  • The selection of appropriate microscopy techniques is critical for successful ECM characterization.
  • Advancements in microscopy enable deeper insights into cell-ECM interactions and fibrotic processes.