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A role for adhesion molecules in contact-dependent T help for B cells
1Department of Neurology and Neurosurgery, McGill University, Quebec, Canada.
European Journal of Immunology
|April 1, 1991
Summary
Cell contact is crucial for T-dependent B cell activation, driving proliferation and immunoglobulin secretion. Adhesion molecules like LFA-1 and ICAM-1 mediate these essential cell interactions.
Area of Science:
- Immunology
- Cell Biology
Background:
- T-dependent B cell activation requires T cell help.
- The precise role of cell contact and adhesion molecules in this process remains incompletely understood.
Purpose of the Study:
- To investigate the role of cell contact and specific adhesion molecules in T-dependent B cell activation.
- To elucidate the signaling mechanisms involved in B cell proliferation and antibody secretion.
Main Methods:
- Culture of B cells with T helper cells in microwells.
- Assessment of B cell proliferation (thymidine incorporation) and immunoglobulin secretion (ELISA).
- Inhibition studies using monoclonal antibodies against LFA-1, ICAM-1, and CD4.
Main Results:
- Monoclonal antibodies against LFA-1, ICAM-1, and CD4 significantly inhibited antibody responses but only partially inhibited proliferation.
- These antibodies did not affect lipopolysaccharide-induced responses or T cell activation to IL-3 secretion.
- Anti-LFA-1 abrogated T-dependent IL-2 responses but not their induction, suggesting a role in downstream signaling.
Conclusions:
- Continued cell contact involving adhesion/accessory molecules is essential for B cell proliferation and response to T cell lymphokines.
- Adhesion molecules likely play a signaling role on B cells during T-dependent activation, analogous to their role on T cells.