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Protein adsorption in microengraving immunoassays.

Qing Song1

  • 1Chemical and Biomolecular Engineering, New York University Polytechnic School of Engineering, 6 Metro Tech Center, Brooklyn, NY 11201, USA. qs299@nyu.edu.

Sensors (Basel, Switzerland)
|October 27, 2015
PubMed
Summary

Microengraving immunoassays quantify single-cell protein secretion rates. This method reveals molecular diffusion dynamics and enables high-throughput screening of cells for clonal expansion.

Keywords:
immunoassayinterfacemicroengravingprotein adsorptionprotein secretionsingle cellstransport dynamicstransport mechanisms

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Immunology

Background:

  • Characterizing protein secretions from single cells is crucial for understanding cellular function and heterogeneity.
  • Existing methods often lack the throughput or sensitivity to analyze large numbers of single cells simultaneously.

Purpose of the Study:

  • To validate microengraving immunoassay for quantifying protein secretion rates from single cells.
  • To elucidate the molecular diffusion and kinetic mechanisms governing protein adsorption in this assay.

Main Methods:

  • Utilized microengraving immunoassay to capture and quantify proteins secreted by single lymphocytes.
  • Analyzed protein adsorption dynamics by varying diffusion and kinetic time scales.
  • Compared experimental adsorption data with theoretical adsorption isotherms.

Main Results:

  • Demonstrated that molecular diffusion is critical in the early stages of protein adsorption, followed by a kinetic-controlled mechanism.
  • Observed consistent dynamic pathways and rapid shifts in transport mechanisms with increased diffusion rates.
  • Experimental data aligned with theoretical adsorption isotherms, showing monotonic increases in captured protein with time.

Conclusions:

  • Microengraving immunoassay accurately quantifies single-cell protein secretion rates.
  • This technique facilitates parallel quantification of secretion rates from large cell populations (10⁴-10⁵ cells).
  • Enables screening of high-secreting cells for clonal expansion and reveals cellular heterogeneity.