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Related Experiment Videos

Antigen trafficking and accessory cell function in respiratory epithelial cells.

E Salik1, M Tyorkin, S Mohan

  • 1Divisions of Clinical Immunology and Pulmonary and Critical Care Medicine, Mount Sinai Medical Center, New York City, New York, USA.

American Journal of Respiratory Cell and Molecular Biology
|August 26, 1999
PubMed
Summary

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Respiratory epithelial cells can present antigens and support T-cell proliferation, suggesting a role in local immune responses. These cells process antigens and immune complexes, expressing key molecules for immune cell interaction.

Area of Science:

  • Immunology
  • Cell Biology
  • Respiratory Medicine

Background:

  • Respiratory epithelial cells (NEC, AEC) and cell lines (A549, BEAS-2B) are crucial for airway defense.
  • Their role in antigen presentation and immune complex processing is not fully understood.

Purpose of the Study:

  • To investigate the accessory cell function of respiratory epithelial cells.
  • To examine antigen trafficking and immune complex uptake in these cells.
  • To determine their capacity to support T-cell proliferation.

Main Methods:

  • Utilized isolated nasal and airway epithelial cells (NEC, AEC) and cell lines (A549, BEAS-2B).
  • Employed laser confocal and electron microscopy for antigen localization.
  • Assessed antigen uptake kinetics and colocalization with endosomal/lysosomal markers.

Related Experiment Videos

  • Analyzed Fcgamma receptor and costimulatory molecule (CD80, CD86) expression via flow cytometry, RT-PCR, and immunohistochemistry.
  • Investigated T-cell proliferation and blockage by specific antibodies.

    • Main Results:

    • NEC and AEC supported antigen-specific and T-cell proliferation.
    • Respiratory epithelial cells internalized FITC-labeled antigens, with uptake kinetics influenced by interferon-gamma stimulation.
    • Electron microscopy revealed antigen processing through early endosomes to lysosomes within 60 minutes.
    • Cells expressed Fcgamma receptors, internalized IgG immune complexes, and expressed costimulatory molecules CD80 and CD86.
    • Anti-CD80 and anti-CD86 antibodies blocked T-cell proliferation.

    Conclusions:

    • Respiratory epithelial cells possess accessory cell functions, including antigen presentation and immune complex handling.
    • These cells actively internalize and process antigens, localizing them within endocytic pathways.
    • Expression of costimulatory molecules suggests a role in initiating local adaptive immune responses in the airways.