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Early phase bronchoconstriction in the mouse requires allergen-specific IgG.
Jeffrey R Crosby1, Grzegorz Cieslewicz, Michael Borchers
1Divisions of Hematology/Oncology and Pulmonary Medicine, Department of Biochemistry and Molecular Biology, Mayo Clinic Scottsdale, Scottsdale, AZ 85259, USA.
Journal of Immunology (Baltimore, Md. : 1950)
|April 9, 2002
Summary
The early phase reaction (EPR) in allergic asthma requires allergen-specific IgG, not IgE or mast cells. This finding reveals new insights into the immunological origins of bronchoconstriction.
Area of Science:
- Immunology
- Pulmonary Medicine
- Allergy Research
Background:
- Allergic asthma involves an early phase reaction (EPR) characterized by rapid bronchoconstriction.
- The cellular and molecular mechanisms driving the EPR remain incompletely understood.
Purpose of the Study:
- To investigate the cellular and molecular origins of the early phase reaction (EPR) in a mouse model of allergic asthma.
Main Methods:
- Utilized a defined ovalbumin (OVA) provocation model in mice.
- Employed gene knockout mice deficient in specific leukocyte populations (B cells, T cells, mast cells).
- Administered OVA-specific IgG or IgE to lymphocyte-deficient mice prior to OVA challenge.
Main Results:
- Wild-type mice exhibited an EPR upon OVA provocation.
- EPR was absent in B cell- and T cell-deficient mice.
- Transfer of OVA-specific IgG, but not IgE, induced EPR in lymphocyte-deficient mice.
- EPR occurred in mast cell-deficient mice, indicating independence from mast cell activity.
Conclusions:
- The EPR in mice is an immunologically driven response requiring allergen-specific IgG.
- Mast cells and IgE are not essential for initiating the EPR in this mouse model.
- These findings suggest alternative mechanisms for early bronchoconstriction in allergic asthma.