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T cell-mediated airway hyperreactivity in mice
H Van Loveren1, J Garssen, F P Nijkamp
1National Institute of Public Health and Environmental Protection, Bilthoven, The Netherlands.
The European Respiratory Journal. Supplement
|April 1, 1991
Summary
This study shows T-cell mediated hypersensitivity can cause airway hyperreactivity, independent of Immunoglobulin E (IgE). This suggests T-cells play a role in asthma, even without elevated IgE levels.
Area of Science:
- Immunology
- Pulmonology
- Cellular Biology
Background:
- Allergic reactions can cause lung injury and airway hyperreactivity.
- Extrinsic asthma often involves mast cells and Immunoglobulin E (IgE).
- Toluene diisocyanate (TDI)-induced asthma is not always linked to high IgE, suggesting other mechanisms.
Purpose of the Study:
- To investigate the role of IgE-independent Type IV hypersensitivity in inducing airway hyperreactivity.
- To explore the immunological mechanisms underlying airway hyperreactivity in asthma models.
Main Methods:
- Mice were sensitized with picryl chloride and challenged with an antigen.
- Immune cell infiltration (macrophages, lymphocytes) around airways was assessed.
- Isometric measurements of mouse tracheal smooth muscle tone were used to assess hyperreactivity to carbachol.
Main Results:
- Peribronchial and perivascular immune cell accumulation peaked 48 hours post-challenge.
- Airway hyperreactivity to carbachol increased from 2 hours, peaked at 48 hours, and lasted over 3 weeks.
- Hyperreactivity was absent in athymic (nude) mice, indicating a role for T-cells.
Conclusions:
- Airway hyperreactivity can be induced by IgE-independent immune responses.
- The study suggests T-cells may play a significant role in inducing airway hyperreactivity in asthma.
- This IgE-independent pathway is relevant even without observable mononuclear infiltrates.