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Fluorescent Peptoids as Selective Live Cell Imaging Probes.

Saulo T A Passos1, José R Correa2, Samira L M Soares2

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Researchers synthesized fluorescent peptoids using the Ugi multicomponent reaction. These peptoids show potential as biomarkers, with one selectively staining mitochondria in breast cancer cells at low concentrations.

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Area of Science:

  • Organic Chemistry
  • Biochemistry
  • Cell Biology

Background:

  • Peptoids are peptide mimics with diverse applications.
  • Fluorescent probes are essential for cellular imaging.
  • Ugi multicomponent reaction offers efficient synthesis of complex molecules.

Purpose of the Study:

  • To synthesize novel fluorescent peptoids using the Ugi multicomponent reaction.
  • To evaluate the photophysical properties and biomarker potential of synthesized peptoids.
  • To investigate the cellular uptake and localization of these peptoids in breast cancer cells.

Main Methods:

  • Ugi multicomponent reaction (4CR) for peptoid synthesis.
  • Photophysical property evaluation.
  • Confocal microscopy for cellular internalization and localization studies.
  • Co-staining with MitoTracker Red.

Main Results:

  • Four fluorescent peptoids were successfully synthesized.
  • The synthesized peptoids exhibited promising photophysical properties.
  • One peptoid demonstrated selective mitochondrial affinity and staining in breast cancer cells.
  • Cellular internalization was observed at nanomolar concentrations (10 nM).

Conclusions:

  • Fluorescent peptoids synthesized via Ugi multicomponent reaction can serve as effective biomarkers.
  • The developed peptoids allow precise localization within cells.
  • Selective mitochondrial staining by a novel peptoid opens avenues for organelle-specific imaging.