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Related Experiment Video

Updated: Mar 16, 2026

FRET Imaging in Three-dimensional Hydrogels
09:47

FRET Imaging in Three-dimensional Hydrogels

Published on: August 1, 2016

13.7K

FRET Imaging in Three-dimensional Hydrogels.

Amalie E Donius1, Sylvain V Bougoin2, Juan M Taboas3

  • 1Department of Oral Biology, Center for Craniofacial Regeneration, McGowan Institute of Regenerative Medicine, University of Pittsburgh.

Journal of Visualized Experiments : Jove
|August 9, 2016
PubMed
Summary
This summary is machine-generated.

This study presents a new method for Förster resonance energy transfer (FRET) imaging in 3D cell cultures, enabling real-time cell biology studies. This technique allows for the detection of cyclic adenosine monophosphate (cAMP) signaling differences in various hydrogel environments.

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Related Experiment Videos

Last Updated: Mar 16, 2026

FRET Imaging in Three-dimensional Hydrogels
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Area of Science:

  • Cell Biology
  • Biophysics
  • Microscopy

Background:

  • Förster resonance energy transfer (FRET) imaging is vital for real-time cell biology analysis.
  • Traditional 2D cell cultures do not accurately represent the 3D cellular microenvironment.
  • A novel FRET imaging method is needed for 3D cellular studies.

Purpose of the Study:

  • To develop a method for quenched emission FRET imaging in 3D hydrogel environments using conventional widefield epifluorescence microscopy.
  • To describe an analysis method for ratiometric FRET probes yielding linear ratios.
  • To demonstrate the measurement of intracellular cyclic adenosine monophosphate (cAMP) levels in chondrocytes within 3D hydrogels.

Main Methods:

  • Utilized quenched emission FRET imaging with widefield epifluorescence microscopy.
  • Developed a linear ratiometric analysis method for FRET probes.
  • Measured intracellular cAMP levels in chondrocytes using the EPAC1 activation probe (ICUE1) within photocrosslinking (PC-gel) and thermoresponsive (TR-gel) hydrogels.

Main Results:

  • Successfully performed FRET imaging in a 3D hydrogel environment.
  • Demonstrated the ability to detect differences in cAMP signaling based on hydrogel material.
  • Validated the method for measuring intracellular cAMP in chondrocytes stimulated with forskolin.

Conclusions:

  • The presented FRET imaging method is easily adoptable for labs using 2D FRET, enabling studies in 3D microenvironments.
  • This technique is suitable for high-throughput drug screening in 3D microtissues.
  • The method is compatible with advanced imaging techniques like FLIM and confocal microscopy.