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Related Experiment Videos

Development of a mast cell-based biosensor.

Theresa Curtis1, Rose Mary Z G Naal, Carl Batt

  • 1Agave BioSystems, Ithaca, NY 14850, USA. curtist@cortland.edu

Biosensors & Bioelectronics
|December 7, 2007
PubMed
Summary
This summary is machine-generated.

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A novel mast cell biosensor detects microbial pathogens with high sensitivity. Rat basophilic leukemia (RBL) mast cells, engineered with a chimeric protein, offer a versatile platform for detecting bacterial contamination like E. coli.

Area of Science:

  • Biotechnology
  • Immunology
  • Cell Biology

Background:

  • Mast cells, specifically Rat basophilic leukemia (RBL) mast cells, are robust and exhibit rapid exocytotic responses.
  • These responses can be monitored using fluorescent dyes indicating intracellular changes like calcium flux or reactive oxygen species generation.

Purpose of the Study:

  • To develop a mast cell-based biosensor for detecting microbial pathogens.
  • To demonstrate the utility of RBL mast cells for pharmaceutical screening, environmental monitoring, and clinical diagnostics.

Main Methods:

  • RBL mast cells were loaded with fluorescent dyes to monitor activation via calcium fluxes.
  • An IgE chimeric protein was engineered by fusing the Fc region of IgE antibody to CD14 to bind bacterial lipopolysaccharides and mast cell IgE receptors.

Related Experiment Videos

  • Fluorescence assays were used to measure mast cell activation in response to bacterial stimuli.

    • Main Results:

    • The mast cell biosensor demonstrated picomolar sensitivity in detecting antigens.
    • RBL mast cells sensitized with the chimeric protein responded to Escherichia coli (E. coli) when labeled with the calcium indicator Fluo-4.
    • The biosensor showed specific responsiveness to E. coli only when sensitized, confirming its utility for bacterial detection.

    Conclusions:

    • A mast cell-based biosensor utilizing RBL cells and a chimeric protein is effective for detecting microbial pathogens.
    • This versatile biosensor platform demonstrates high sensitivity and specificity for bacterial contamination, applicable to various fields.
    • The developed biosensor opens new avenues for rapid and sensitive pathogen detection in diverse settings.