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Expression of Tac antigen on activated normal human B cells
The Journal of Experimental Medicine
|August 1, 1984
Summary
Normal B cells, when activated by Staphylococcus aureus Cowan I (SAC), express Tac antigen. Interleukin 2 (IL-2) drives the proliferation of these SAC-activated B cells, indicating a role for the IL-2 receptor system in B cell immunity.
Area of Science:
- Immunology
- Cell Biology
Background:
- Tac antigen was previously thought to be exclusive to T cells.
- B cell activation and proliferation are critical components of the adaptive immune response.
Purpose of the Study:
- To investigate the expression of Tac antigen on activated B cells.
- To determine the role of interleukin 2 (IL-2) and its receptor in B cell proliferation.
Main Methods:
- Two-color fluorescence analysis was used to detect Tac antigen expression.
- Immunoaffinity-purified IL-2 was used to stimulate SAC-activated B cells.
- Anti-Tac antibody was employed to block IL-2 receptor function.
Main Results:
- Tac antigen was found to be expressed on a subset of normal B cells activated by Staphylococcus aureus Cowan I (SAC).
- IL-2 induced proliferation in SAC-activated B cells.
- Anti-Tac antibody completely inhibited IL-2-induced B cell proliferation, confirming the blockade of IL-2 action.
Conclusions:
- The IL-2 receptor system is directly implicated in the immune response of B cells.
- Tac antigen expression on activated B cells suggests a broader role for this molecule beyond T cell populations.
- These findings highlight a novel mechanism regulating B cell activation and proliferation.