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Related Experiment Videos

Two-photon microscopy of cells and tissue.

Michael Rubart1

  • 1Herman B Wells Center for Pediatric Research and Krannert Institute of Cardiology, Indiana University School of Medicine, 1044 W Walnut St, Rm W359, Indianapolis, IN 46202-5225, USA. mrubartv@iupui.edu

Circulation Research
|December 14, 2004
PubMed
Summary

Two-photon excitation microscopy offers advanced deep-tissue imaging by confining light to the focal plane. This technique enhances penetration, collection efficiency, and reduces photodamage, ideal for studying cellular events in scattering tissues like the heart.

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Area of Science:

  • Biomedical Optics
  • Microscopy
  • Cellular Imaging

Background:

  • Confocal microscopy faces limitations in deep-tissue imaging due to scattering and out-of-focus light.
  • Photobleaching and photodamage restrict long-term observation of biological specimens.
  • Advanced imaging techniques are needed to study cellular dynamics in intact, complex tissues.

Purpose of the Study:

  • To provide an overview of two-photon excitation microscopy (TPEM) applications.
  • To highlight TPEM's advantages over single-photon confocal microscopy.
  • To demonstrate TPEM's utility in assessing cellular events within intact scattering tissues.

Main Methods:

  • Utilizing two-photon excitation to restrict fluorophore excitation to the microscope's focal plane.

Related Experiment Videos

  • Leveraging the absence of a pinhole for increased fluorescence collection efficiency.
  • Applying localized excitation for photolysis and diffusion measurements.

    • Main Results:

    • Achieved thin optical sections from deep within thick, scattering specimens.
    • Demonstrated increased penetration depth and reduced photobleaching/photodamage.
    • Resolved calcium dynamics in individual cardiomyocytes within intact, perfused hearts.

    Conclusions:

    • Two-photon excitation microscopy is highly suitable for in-vivo imaging of cellular and subcellular events.
    • TPEM enables long-term observation of biological specimens with minimal damage.
    • TPEM shows significant potential for integrative cardiac physiology research.