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Related Experiment Videos

Single-cell immunosensors for protein detection.

Rebecca J Whelan1, Richard N Zare

  • 1Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA.

Biosensors & Bioelectronics
|November 15, 2003
PubMed
Summary
This summary is machine-generated.

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This study presents a novel single-cell detector using immune cells and calcium signaling for protein detection. This biosensor offers a sensitive and specific method for identifying target analytes.

Area of Science:

  • Biotechnology
  • Immunology
  • Cellular Biology

Background:

  • Whole-cell biosensors offer natural signal amplification.
  • Immunological recognition provides flexibility and specificity.
  • Immune cells expressing immunoglobulin G (IgG) receptors can be utilized for detection.

Purpose of the Study:

  • To develop a single-cell detector combining biosensing with immunological specificity.
  • To utilize the calcium (Ca2+) signaling pathway in immune cells for analyte detection.
  • To optimize the U-937 monocytic cell line for use as an immunity-based detector.

Main Methods:

  • Loading immune cells with Ca(2+)-indicating dye and specific antibodies.
  • Inducing receptor cross-linking with multivalent protein antigens.

Related Experiment Videos

  • Utilizing the human monocytic cell line U-937, treated with interferon-gamma, for Ca(2+) signal detection.

    • Main Results:

    • Cross-linking of IgG receptors on U-937 cells triggers a detectable increase in cytosolic Ca(2+).
    • The U-937 cell line produces a large, transient Ca(2+) signal upon stimulation.
    • The detector demonstrated sensitivity to ovalbumin in micromolar concentrations and responded to repeated stimulation.

    Conclusions:

    • The developed U-937-based detector effectively combines immune recognition with Ca(2+) signaling for analyte detection.
    • The system shows potential for detecting specific protein antigens with high sensitivity.
    • Further research may explore constraints on analyte size and optimize detection limits.