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Related Experiment Videos

SLIM: a new method for molecular imaging.

A Rück1, Ch Hülshoff, I Kinzler

  • 1Institute for Laser Technologies in Medicine and Metrology, Helmholtzstr. 12, 89081 Ulm, Germany. angelika.rueck@ilm.uni-ulm.de

Microscopy Research and Technique
|March 17, 2007
PubMed
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Spectrally resolved fluorescence lifetime imaging (SLIM) distinguishes cellular dyes like rhodamine 123 and DAPI, and resolves Photofrin components. This advanced technique reveals insights into mitochondrial metabolism and drug interactions.

Area of Science:

  • Biophysics
  • Cell Biology
  • Spectroscopy

Background:

  • Fluorescence microscopy is crucial for cellular analysis.
  • Distinguishing specific fluorophores and their interactions within cells remains challenging.
  • Understanding photosensitizer behavior is key for photodynamic therapy (PDT).

Purpose of the Study:

  • To apply spectrally resolved fluorescence lifetime imaging (SLIM) for detailed cellular analysis.
  • To differentiate between various fluorophores and their binding sites within cells.
  • To investigate the components and behavior of the photosensitizer Photofrin in cell cultures.

Main Methods:

  • Utilized spectrally resolved fluorescence lifetime imaging (SLIM).
  • Employed a laser scanning microscope with a spectrograph and a 16-channel multianode PMT.

Related Experiment Videos

  • Implemented multidimensional time-correlated single photon counting (TCSPC) with Ti:Saphir or ps diode laser excitation.

    • Main Results:

    • Successfully distinguished the mitochondria dye rhodamine 123 from DAPI (binding to RNA/DNA).
    • Discriminated different binding sites of DAPI based on spectral channel lifetime variations.
    • Resolved monomeric and aggregated forms of Photofrin, attributing distinct lifetimes to each.
    • Analyzed autofluorescence to explain metabolic changes during Photofrin-PDT.

    Conclusions:

    • SLIM provides high-resolution spectral and temporal fluorescence data for complex cellular studies.
    • This technique enables differentiation of fluorophores, their binding states, and drug components.
    • SLIM offers valuable insights into cellular metabolism and photodynamic therapy mechanisms.