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Fast Nanoliter-Scale Cell Assays Using Droplet Microarray-Mass Spectrometry Imaging.

Carina RamalloGuevara1, Dorothea Paulssen2, Anna A Popova2

  • 1Center for Mass Spectrometry and Optical Spectroscopy (CeMOS), Mannheim University of Applied Sciences, Paul-Wittsack Str. 10, Mannheim, 68163, Germany.

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Summary

This study introduces a novel droplet microarray-mass spectrometry imaging (DMA-MSI) platform for label-free cell-based drug profiling. This integrated system enhances high-throughput pharmaceutical research by combining miniaturized assays with high-content molecular analysis.

Keywords:
MALDI imagingMALDI mass spectrometrydroplet microarraydrug discoveryfatty acid synthaseminiaturized cell-based assay

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Area of Science:

  • Biotechnology
  • Analytical Chemistry
  • Pharmaceutical Science

Background:

  • Cell-based assays in drug discovery often rely on label-dependent methods.
  • Miniaturized droplet microarrays (DMA) and matrix-assisted laser desorption/ionization (MALDI) mass spectrometry (MS) offer high-throughput and label-free analysis capabilities.
  • Integrating these technologies can advance cell assay analysis.

Purpose of the Study:

  • To develop and demonstrate a droplet microarray-mass spectrometry imaging (DMA-MSI) platform.
  • To enable label-free, high-content drug profiling using miniaturized cell assays.
  • To combine microscopy and MALDI-MS imaging for comprehensive cellular analysis.

Main Methods:

  • Integration of nanoliter-scale cell assays on droplet microarrays (DMAs) with MALDI-MS imaging (MALDI-MSI).
  • Utilizing superhydrophobic-hydrophilic surfaces for droplet containment.
  • Direct cell culture on DMAs for combined microscopy and MALDI-MSI analysis.
  • Miniaturization of array spots to 0.5 mm for analysis of small cell numbers (as few as ten cells per spot).

Main Results:

  • Demonstrated concentration-response profiling of the fatty acid synthase inhibitor GSK2194069 using A549 lung cancer cells.
  • Successful integration of cell culture, microscopy, and MALDI-MSI on the DMA-MSI platform.
  • Achieved high-speed, high molecular content analysis with label-free readout.

Conclusions:

  • The developed DMA-MSI platform effectively combines miniaturized droplet microarrays with MALDI-MSI for label-free drug profiling.
  • This platform is a valuable tool for high-throughput cell-based assays in pharmaceutical research and development.
  • The integration offers a powerful complement to existing cell assay technologies.