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Exploiting Fluorescence Lifetime Plasticity in FLIM: Target Molecule Localization in Cells and Tissues.

A Boreham1, T-Y Kim1, V Spahn2

  • 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany.

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Summary

A new ratiometric fluorescence lifetime imaging microscopy (rmFLIM) method visualizes drug-receptor interactions and nanocarrier distribution. This technique enhances understanding of nanomedicine applications in drug delivery and biological systems.

Keywords:
FLIMG-protein coupled receptorsligand bindingnanocarrierμ-opioid receptor

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Area of Science:

  • Nanomedicine
  • Biophysics
  • Pharmacology

Background:

  • Drug-receptor interactions and nanocarrier-based drug delivery are key nanomedicine research areas.
  • G-protein coupled receptors (GPCRs) are crucial drug targets due to their central role in physiological and pathological processes.

Purpose of the Study:

  • To develop and present a fast, reliable ratiometric fluorescence lifetime imaging microscopy (rmFLIM) method.
  • To analyze the distribution of protein-ligand complexes within cells.
  • To demonstrate the method's applicability to nanocarrier distribution in tissue.

Main Methods:

  • Utilized ratiometric fluorescence lifetime imaging microscopy (rmFLIM).
  • Applied the method to study the binding of fluorescently labeled naloxone to the μ-opioid receptor.
  • Extended the rmFLIM approach to analyze polymer-based nanocarrier distribution in liver tissue sections.

Main Results:

  • Successfully demonstrated a fast and reliable rmFLIM approach for analyzing protein-ligand complex distribution.
  • Visualized the binding of an antagonist to a specific G-protein coupled receptor in a cellular context.
  • Showcased the broad applicability of rmFLIM by analyzing nanocarrier distribution in histological liver samples.

Conclusions:

  • The developed rmFLIM method offers a powerful tool for studying drug-receptor interactions at the cellular level.
  • This technique has significant potential for evaluating drug distribution and nanocarrier delivery in biological systems.
  • rmFLIM provides valuable insights for advancing nanomedicine research and therapeutic development.