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Acid selective pro-dye for cellular compartments.

Barbara Czaplińska1, Katarzyna Malarz2, Anna Mrozek-Wilczkiewicz2

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A new pro-dye enables selective staining of acidic cellular compartments like lysosomes. This approach uses a Schiff base to release a fluorophore, improving imaging of subcellular structures.

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Area of Science:

  • Chemical Biology
  • Cell Biology
  • Fluorescence Imaging

Background:

  • Selective staining of subcellular compartments is crucial for cell biology research.
  • Existing methods may lack specificity or stability in biological systems.

Purpose of the Study:

  • To develop a novel pro-dye for acid-selective staining of subcellular compartments.
  • To achieve enhanced permeability and selectivity in cellular imaging.

Main Methods:

  • Design and synthesis of a Schiff base-containing pro-dye.
  • Investigation of physicochemical properties (Stokes shift, fluorescence lifetime).
  • Evaluation of acid-sensitive imine bond cleavage and fluorophore release.
  • Biological assays for intracellular staining and imaging of lysosomes and endosomes.
  • Theoretical calculations to support experimental findings.

Main Results:

  • The designed pro-dye exhibits a large Stokes shift and long-lived intracellular fluorescence.
  • Acid-sensitive cleavage of the imine bond releases a fluorophore.
  • The released fluorophore enables selective and effective imaging of acidic organelles.
  • Demonstrated suitability for imaging lysosomes and endosomes with improved selectivity.

Conclusions:

  • The pro-dye approach offers a promising strategy for acid-selective organelle staining.
  • The Schiff base-based design facilitates targeted fluorophore release and enhanced imaging.
  • This method provides a valuable tool for studying cellular acidic compartments.