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Red emitting neutral fluorescent glycoconjugates for membrane optical imaging.

Sébastien Redon1, Julien Massin, Sandrine Pouvreau

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Researchers developed novel fluorescent probes that mimic natural glycolipids for improved membrane imaging. These probes offer enhanced cellular localization and loading efficiency in muscle cells compared to existing dyes.

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Area of Science:

  • Biophysical Chemistry
  • Organic Synthesis
  • Cell Biology

Background:

  • Developing effective fluorescent probes is crucial for visualizing cellular structures and processes.
  • Existing membrane imaging dyes often have limitations in specificity and efficiency.
  • Mimicking natural glycolipids offers a promising strategy for enhancing probe-membrane interactions.

Purpose of the Study:

  • To design and synthesize novel neutral fluorescent probes with optimized membrane affinity.
  • To evaluate the optical, biophysical, and biological properties of these new probes.
  • To compare their performance with commercially available membrane imaging dyes.

Main Methods:

  • Synthesis of probes by connecting saccharidic structures to a dicyanoisophorone-based push-pull chromophore.
  • Evaluation of membrane insertion properties using Langmuir monolayer balance.
  • Confocal fluorescence microscopy on muscle cells to assess localization and loading efficiency.

Main Results:

  • Probes exhibited red fluorescence with a large Stokes shift.
  • Structural variations influenced probe localization and loading efficiency in muscle cells.
  • The most effective probes demonstrated comparable brightness to ANEPPS but with sharper imaging.

Conclusions:

  • A straightforward synthetic strategy yielded a series of effective fluorescent probes.
  • Probes with a single chromophore, limited carbohydrate size, and rod-like shape performed best.
  • These novel probes show potential for advanced membrane imaging applications.