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Light exposure and cell viability in fluorescence microscopy.

H Schneckenburger1, P Weber, M Wagner

  • 1Hochschule Aalen, Institut für Angewandte Forschung, Beethovenstr. 1, 73430 Aalen, Germany. herbert.schneckenburger@htwaalen.de

Journal of Microscopy
|December 1, 2011
PubMed
Summary
This summary is machine-generated.

Optical microscopy requires careful light dose management to maintain cell viability. Fluorescent markers significantly reduce tolerable light doses, impacting imaging techniques like super-resolution microscopy.

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Area of Science:

  • Cell biology
  • Microscopy
  • Photobiology

Background:

  • Cell viability assays are crucial for microscopy.
  • Optical microscopy techniques can induce phototoxicity.
  • Fluorescent probes can enhance imaging but may increase light sensitivity.

Purpose of the Study:

  • Establish and apply test systems for measuring cell viability under optical microscopy.
  • Determine maximum tolerable light doses for various cell types and imaging conditions.
  • Assess the impact of fluorescent markers and proteins on light dose tolerance.

Main Methods:

  • Developed cell viability assays based on colony formation and lysosomal integrity.
  • Irradiated human glioblastoma and Chinese hamster ovary cells with varying light doses.
  • Utilized wide-field, laser scanning, and structured illumination microscopy.

Main Results:

  • Native cells tolerated 25–300 J cm⁻² of light.
  • Fluorescent markers/proteins reduced tolerable doses to < 1–50 J cm⁻².
  • 3D imaging of single cells and spheroids was feasible within tolerable doses, but super-resolution microscopy may exceed them.

Conclusions:

  • Cell viability in optical microscopy is highly dependent on light dose and the use of fluorescent agents.
  • Careful optimization of light exposure is necessary for high-resolution and 3D imaging.
  • Super-resolution microscopy techniques may require further development to mitigate phototoxicity.