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Related Concept Videos

Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

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Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
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Super-Resolution Live Cell Imaging of Subcellular Structures
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Super-Resolution Live Cell Imaging of Subcellular Structures

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Light-induced cell damage in live-cell super-resolution microscopy.

Sina Wäldchen1, Julian Lehmann1, Teresa Klein1

  • 1Department of Biotechnology and Biophysics, Biocenter, University of Würzburg, Am Hubland, 97074 Würzburg, Germany.

Scientific Reports
|October 21, 2015
PubMed
Summary
This summary is machine-generated.

Super-resolution microscopy requires high light doses that can damage cells. Red fluorophores are recommended for live-cell imaging due to lower phototoxicity compared to blue light, preserving cell viability and structure.

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Area of Science:

  • Cell Biology
  • Microscopy
  • Biophysics

Background:

  • Super-resolution microscopy offers unprecedented detail of cellular structures.
  • High light intensities are necessary but can cause phototoxicity in live cells.

Purpose of the Study:

  • To investigate the impact of irradiation parameters on cell survival and microtubule dynamics under super-resolution microscopy conditions.
  • To identify optimal conditions for minimizing phototoxicity in live-cell imaging.

Main Methods:

  • Single-molecule localization microscopy (SMLM) was used to assess cell survival and microtubule growth speed.
  • Experiments varied irradiation intensity, illumination mode, wavelength, light dose, temperature, and fluorescent labeling.
  • Phototoxicity was evaluated across different cell lines 20-24 hours post-irradiation.

Main Results:

  • Phototoxicity significantly increases with shorter wavelengths (e.g., 405 nm vs. 640 nm).
  • Cells tolerated ~1 kW cm⁻² at 640 nm for minutes, but only ~50 J cm⁻² at 405 nm.
  • Observed damage included fixation, plasma membrane permeabilization, and cytoskeleton destruction at shorter wavelengths.

Conclusions:

  • Red fluorophores (e.g., at 640 nm) are strongly recommended for live-cell localization microscopy to minimize phototoxicity.
  • Strategies to reduce phototoxic effects and enhance cellular resilience to high light doses are presented.