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Atopy and the human IL-4 receptor alpha chain
K Izuhara1, Y Yanagihara, N Hamasaki
1Department of Clinical Chemistry and Laboratory Medicine, Faculty of Medicine, Kyushu University; the Clinical Research Center for Allergy, National Sagamihara Hospital, Japan.
The Journal of Allergy and Clinical Immunology
|July 11, 2000
Summary
The Ile(50) variant of the human IL-4 receptor alpha chain (hIL-4Ralpha) is linked to atopic asthma, especially in children. This genetic variation may increase IgE production and disease risk.
Area of Science:
- Immunogenetics
- Molecular Biology
- Allergy Research
Background:
- Atopy is an inherited disorder with increased IgE responsiveness, but candidate gene functions remain unclear.
- The human IL-4 receptor alpha chain (hIL-4Ralpha) is critical for IL-4 signaling, making it a potential candidate gene for atopy.
- Interleukin-4 (IL-4) plays a key role in B-cell IgE production.
Purpose of the Study:
- To investigate the association between variations in amino acid 50 of hIL-4Ralpha and atopic asthma.
- To functionally analyze the impact of the Ile(50) and Val(50) variants on IL-4 signaling and related cellular responses.
Main Methods:
- Genetic analysis in a Japanese population to correlate hIL-4Ralpha amino acid 50 variants (Ile(50) vs. Val(50)) with atopic asthma.
- Functional studies using transfectants expressing hIL-4Ralpha variants to assess IL-4 receptor activity.
- Analysis of CD23 expression and IgE synthesis in peripheral blood mononuclear cells stimulated with IL-4.
Main Results:
- The Ile(50) variant was more prevalent in individuals with atopic asthma, particularly children.
- Ile(50) variant upregulated germline epsilon transcription and Stat6 activity compared to Val(50).
- Ile(50) variant augmented CD23 expression and IgE synthesis in response to IL-4 stimulation.
Conclusions:
- The Ile(50) variant of hIL-4Ralpha is potentially associated with atopic asthma.
- This association appears stronger in pediatric populations.
- Functional data suggest Ile(50) enhances IL-4-mediated signaling pathways involved in IgE production.
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