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B cells do not present antigen covalently linked to microspheres
A Galelli1, B Charlot, E Dériaud
1Laboratoire de Biologie des Régulations Immunitaires, Institut Pasteur, Paris, France.
Immunology
|May 1, 1993
Summary
B cells efficiently present soluble antigens but struggle with large, particulate antigens like bacteria. This study shows B cells are ineffective at presenting complex, bead-bound antigens to T cells.
Area of Science:
- Immunology
- Cell Biology
Background:
- B cells are known for efficient antigen presentation to T cells via membrane immunoglobulin.
- This interaction drives B cell proliferation and differentiation, typically studied with soluble antigens.
Purpose of the Study:
- To investigate B cell capacity for presenting large, complex particulate antigens.
- To compare B cell presentation of soluble versus particulate antigens.
Main Methods:
- Used trinitrophenyl (TNP)-specific B cells and TNP-KLH antigen in soluble and microsphere-bound forms (0.25-1.5 microns).
- Assessed T cell proliferation in response to antigen presentation by B cells with accessory antigen-presenting cells (APCs).
Main Results:
- KLH-specific T cells proliferated with both soluble and bead-bound TNP-KLH when presented by APCs.
- TNP-specific memory B cells effectively presented soluble TNP-KLH but failed to present TNP-KLH beads to T cells.
- Similar results observed with A20 B lymphoma and lipopolysaccharide (LPS)-activated B cells.
Conclusions:
- B cells are ineffective at presenting large, particulate antigens, such as those found on bacteria or parasites.
- This limitation contrasts with their high efficiency in presenting soluble antigens.