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Subtle phototoxicity from folic acid in imaging media caused artifactual transient cAMP signals, contrasting with sustained responses observed via confocal time-correlated single photon counting (TCSPC). This highlights the need for careful experimental design and full chemical disclosure.

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Area of Science:

  • Cellular biology
  • Biophysics
  • Pharmacology

Background:

  • Cell signaling dynamics are crucial for biological outcomes.
  • Fluorescence Lifetime Imaging of Resonance Energy Transfer (FLIM/FRET) biosensors are used to study intracellular signaling.
  • The β1 receptor-Gαs-cAMP signaling axis is a key pathway in cellular communication.

Purpose of the Study:

  • To investigate intracellular signaling dynamics using FLIM/FRET biosensors.
  • To compare cAMP signaling kinetics using widefield frequency domain FLIM (fdFLIM) and confocal time-correlated single photon counting (TCSPC).
  • To identify the cause of discrepancies in observed cAMP response kinetics.

Main Methods:

  • Utilized both widefield frequency domain FLIM (fdFLIM) and fast confocal time-correlated single photon counting (TCSPC) setups.
  • Employed FLIM/FRET biosensors to monitor the β1 receptor-Gαs-cAMP signaling axis.
  • Investigated potential light-induced effects and medium component interactions.

Main Results:

  • fdFLIM unexpectedly revealed transient cAMP responses, while TCSPC detected sustained responses in HeLa and Cos7 cells.
  • No direct light-induced effects on cAMP generation or breakdown were found.
  • Folic acid in the imaging medium, upon blue light excitation, sensitized the degradation of β1 agonists, causing artifactual signaling.

Conclusions:

  • Subtle phototoxicity, specifically from folic acid excitation, can significantly impact the observed kinetics of intracellular signaling.
  • Confocal TCSPC is advocated for reliable analysis of signaling response kinetics.
  • Full disclosure of chemical formulations by scientific vendors is essential for experimental reproducibility.