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PhotoFiTT: a quantitative framework for assessing phototoxicity in live-cell microscopy experiments.

Mario Del Rosario1,2, Estibaliz Gómez-de-Mariscal1,2,3, Leonor Morgado1,2,3,4

  • 1Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Oeiras, Portugal.

Nature Communications
|December 13, 2025
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Summary

Phototoxicity in live-cell microscopy compromises experiments. A new framework, PhotoFiTT (Phototoxicity Fitness Time Trial), quantifies light-induced cellular stress, enabling optimized imaging protocols for better sample health and data quality.

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Area of Science:

  • Cell biology
  • Microscopy
  • Biophysics

Background:

  • Phototoxicity is a significant challenge in live-cell fluorescence microscopy, limiting experimental duration and data accuracy.
  • Quantitative assessment of light-induced cellular stress is crucial for reliable experimental outcomes.
  • Existing methods for quantifying phototoxicity are limited, hindering protocol optimization.

Purpose of the Study:

  • To develop and validate an integrated framework, PhotoFiTT (Phototoxicity Fitness Time Trial), for quantifying phototoxicity in live-cell imaging.
  • To establish quantitative benchmarks for acceptable light-induced cellular stress.
  • To enable optimization of microscopy imaging protocols to balance image quality with cellular health.

Main Methods:

  • Development of a standardized experimental protocol for controlled light exposure.
  • Application of advanced, label-free image analysis leveraging machine learning.
  • Analysis of cell cycle dynamics, including mitotic timing, cell size, and cellular activity.

Main Results:

  • PhotoFiTT effectively quantifies light-induced cellular stress in label-free settings.
  • Demonstrated wavelength- and dose-dependent phototoxic effects in mammalian cells.
  • Near-UV light induced significant mitotic delays at low doses (0.6 J/cm²), while longer wavelengths required higher doses.

Conclusions:

  • PhotoFiTT provides a robust method for quantifying phototoxicity in live-cell microscopy.
  • The framework allows researchers to determine safe light exposure limits.
  • Optimized imaging protocols using PhotoFiTT can improve experimental reliability and maintain cellular health.