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The LFA-1 antigen in human B lymphocyte activation
H Zola1, V Furness, A Nikoloutsopoulos
1Department of Clinical Immunology, Flinders Medical Centre, Flinders University of South Australia, Bedford Park.
Disease Markers
|April 1, 1989
Summary
Human B cell activation increases LFA-1 antigen expression, suggesting altered cell interactions. However, LFA-1 is not directly involved in B cell proliferation or differentiation mediated by lymphokines.
Area of Science:
- Immunology
- Cell Biology
Background:
- Human tonsil B cells exhibit heterogeneity, with a subset lacking the Leukocyte Function-associated Antigen-1 (LFA-1).
- LFA-1 plays a crucial role in cell-cell adhesion and immune cell interactions.
Purpose of the Study:
- To investigate the modulation of LFA-1 expression on human B cells during activation.
- To determine the role of LFA-1 in B cell proliferation and lymphokine-mediated differentiation.
Main Methods:
- Human tonsil B cells were cultured with anti-IgM and interleukin-4 to induce activation.
- Flow cytometry was used to assess LFA-1 expression.
- Proliferation and immunoglobulin secretion were measured in the presence of a monoclonal antibody against the LFA-1 beta chain.
Main Results:
- B cell activation with anti-IgM and IL-4 significantly increased LFA-1 expression in a majority of cells within 48 hours.
- Further culture with B cell growth factor induced only a minor increase in LFA-1 expression.
- Inhibition of LFA-1 function did not impact B cell proliferation or immunoglobulin secretion.
Conclusions:
- LFA-1 expression on human B cells is dynamically regulated during activation, potentially reflecting altered requirements for cellular interactions.
- The LFA-1 antigen does not appear to be directly implicated in the interaction of B cells with lymphokines that regulate proliferation and differentiation.