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Experiments on the passive sensitization of human basophils, using quantitative immunofluorescence microscopy
International Archives of Allergy and Applied Immunology
|January 1, 1977
Summary
This study investigated immunoglobulin E (IgE) binding to basophils. Researchers found that free IgE receptors on basophils could not be saturated, suggesting a new model involving receptor turnover.
Area of Science:
- Immunology
- Cell Biology
Background:
- Previous experiments indicated a correlation between IgE on human basophils and serum IgE levels, fitting a free exchange model.
- This model suggests the presence of free IgE receptors on basophils.
Purpose of the Study:
- To investigate if free IgE receptors on basophils can be saturated by IgE.
- To test an alternative hypothesis involving receptor turnover to explain experimental observations.
Main Methods:
- Incubating leukocyte suspensions with IgE myeloma protein or elevated IgE sera.
- Utilizing quantitative immunofluorescence to measure basophil-bound IgE.
- Assessing IgE-receptor complex dissociation over 24 hours.
Main Results:
- No increase in basophil-bound IgE was detected under various incubation conditions, using cells from atopic and nonatopic subjects.
- Significant dissociation of cell-bound IgE was not observed within 24 hours.
Conclusions:
- The free exchange model with a constant K-value does not fully explain the experimental findings.
- A new hypothesis proposing shorter functional half-lives for free IgE receptors compared to IgE-receptor complexes is suggested to reconcile the data.