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Area of Science:

  • Biochemistry
  • Cell Biology
  • Materials Science

Background:

  • Accurate dose-dependent bioactivity assessment is vital for drug discovery.
  • Small-molecule microarrays offer miniaturized screening but struggle with quantitative dose-response curves, especially for lipophilic drugs.
  • Controlling drug dosage at the cellular level is challenging for surface-based assays.

Purpose of the Study:

  • To develop a small-molecule microarray assay for precise control of lipophilic drug dosage delivered to cells.
  • To enable quantitative in vitro dose-response curve generation using surface-supported lipid nanostructures.
  • To validate the assay's performance with FDA-approved lipophilic anticancer drugs.

Main Methods:

  • Fabrication of surface-supported lipid micro- and nanostructure arrays using nanointaglio to control sub-cellular volumes.
  • Utilizing fluorescence microscopy calibrated by atomic-force microscopy to determine nanostructure volumes.
  • Assessing HeLa cell response to varying concentrations of docetaxel, imiquimod, and triethylenemelamine presented via the microarray.

Main Results:

  • The assay successfully controlled lipophilic drug dosage by varying nanostructure volumes, enabling quantitative dose-response curves.
  • EC-50 values for three anticancer drugs were determined and found to differ significantly from controls.
  • No significant toxicity or leakage was observed in surrounding control cells, confirming assay specificity.
  • Microarray data showed quantitative differences compared to liposomal delivery, attributed to cell-adhesion effects.

Conclusions:

  • The developed small-molecule microarray assay precisely controls lipophilic drug dosage for quantitative dose-response analysis.
  • This platform is scalable for high-throughput screening, potentially generating 10,000 dose-response curves on a microtiter plate.
  • The assay provides a valuable tool for drug discovery and personalized medicine, particularly for lipophilic compounds.