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Related Experiment Videos

Single-cell microarray for analyzing cellular response.

Shohei Yamamura1, Hiroyuki Kishi, Yoshiharu Tokimitsu

  • 1Toyama New Industry Organization, 529, Takada, Toyama 930-0866, and School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1, Asahidai, Nomi City, Ishikawa 923-1292, Japan.

Analytical Chemistry
|December 15, 2005
PubMed
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This study introduces a single-cell microarray for analyzing cellular responses, specifically tracking intracellular calcium (Ca2+)i in individual lymphocytes. This method enables high-throughput screening of antigen-specific lymphocytes for monoclonal antibody development.

Area of Science:

  • Cell Biology
  • Immunology
  • Biotechnology

Background:

  • Intracellular calcium (Ca2+)i dynamics are crucial for understanding cellular responses to ligand stimulation and receptor interactions.
  • Current methods for analyzing cellular responses, like flow cytometry, often lack the resolution to study individual cells effectively.

Purpose of the Study:

  • To develop and validate a single-cell microarray system for high-throughput analysis of intracellular calcium responses in individual lymphocytes.
  • To demonstrate the system's capability for screening antigen-specific lymphocytes for monoclonal antibody production.

Main Methods:

  • A novel single-cell microarray chip with over 30,000 microchambers was fabricated from polystyrene.
  • Lymphocytes from mouse spleen and human blood were cultured on the microarray, achieving over 80% single-cell occupancy.

Related Experiment Videos

  • B-cells were stimulated via antigen receptors on the microarray, and their intracellular calcium responses were measured using Ca2+-dependent fluorescent dyes.

    • Main Results:

    • The system successfully detected activated B-cells by comparing their intracellular calcium levels before and after antigen stimulation.
    • Positive single B-cells were retrieved from microchambers using a micromanipulator for subsequent antibody DNA analysis.
    • The microarray system demonstrated high-throughput capacity for single-cell intracellular calcium response analysis.

    Conclusions:

    • The developed single-cell microarray system provides a powerful tool for analyzing cellular responses at the individual cell level.
    • This technology facilitates the screening of antigen-specific lymphocytes, paving the way for efficient monoclonal antibody generation.