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Crosstalk-Assisted Augmented Activity of Polyphenolic Molecules: A Study Using Fluorescence Lifetime Imaging

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Biochemistry

Background:

  • Small molecule self-assembly is crucial for understanding molecular behavior.
  • Fluorescence lifetime imaging microscopy (FLIM) provides molecular-level insights into microenvironments.
  • Polyphenols like gallic acid (GA) and methyl gallate (MG) are natural compounds with potential biological activity.

Purpose of the Study:

  • To investigate the self-assembly and co-assembly mechanisms of gallic acid and methyl gallate.
  • To elucidate the structural transitions and morphological changes during self-assembly using FLIM.
  • To evaluate the impact of co-assembly on the biological activity, specifically cytotoxicity and cancer cell progression.

Main Methods:

  • Synthesis and characterization of gallic acid (GA) and methyl gallate (MG) assemblies.
  • Fluorescence lifetime imaging microscopy (FLIM) to study structural transitions and molecular packing.
  • In vitro cytotoxicity assays and cancer cell progression studies under physiological conditions.

Main Results:

  • GA self-assembles into rod-like structures, while MG forms cotton-like aggregates.
  • Equimolar co-assembly of GA and MG results in a distinct fibrillar structure with improper molecular packing.
  • FLIM revealed structural transitions and morphological differences between individual and co-assemblies.
  • Co-assemblies disintegrate under physiological conditions, but individual molecules retain their architectures.
  • Co-polyphenols exhibited enhanced dose-dependent cytotoxicity and mitigated cancer cell progression compared to individual polyphenols.

Conclusions:

  • The co-assembly of GA and MG leads to a novel fibrillar structure with altered properties.
  • FLIM is a powerful tool for understanding self-assembly mechanisms and molecular packing.
  • Co-assembly of polyphenols can enhance their efficacy as drug molecules, offering a strategy to improve drug performance.