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Receptors for IgA on rabbit lymphocytes. I. Distribution, specificity, and modulation
Journal of Immunology (Baltimore, Md. : 1950)
|December 1, 1980
Summary
Researchers identified IgA binding lymphoid cells in rabbits, finding higher percentages in key immune organs. These cells, expressing receptors for IgA (RFc alpha), may play a role in regulating IgA-mediated immunity.
Area of Science:
- Immunology
- Cell Biology
Background:
- Immunoglobulin A (IgA) is crucial for mucosal immunity.
- Understanding the distribution and function of IgA-binding cells is essential for immune research.
Purpose of the Study:
- To determine the distribution of IgA binding lymphoid cells in rabbits.
- To characterize the receptors for IgA (RFc alpha) on these cells.
Main Methods:
- Utilized ox erythrocytes coated with secretory IgA to detect IgA binding lymphocytes.
- Employed cross-blocking studies with purified immunoglobulins (IgG, IgM, IgA) to differentiate receptors.
- Assessed receptor sensitivity to pronase digestion and regeneration.
Main Results:
- Higher percentages of IgA binding lymphocytes were found in major IgA-producing organs (Peyer's patches, appendix, mesenteric lymph nodes) compared to systemic tissues.
- Receptors for IgA (RFc alpha) were detected in spleen and absent in thymus after incubation.
- RFc alpha were distinct from receptors for IgM or IgG, sensitive to pronase, and could be regenerated.
- Antibodies specific for rabbit immunoglobulin increased the percentage of cells expressing RFc alpha.
Conclusions:
- Lymphoid cells expressing RFc alpha are distributed in specific patterns within the rabbit immune system.
- RFc alpha-expressing lymphocytes are likely involved in the regulation or expression of IgA-mediated immunity.