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Both CD45R(low) and CD45R(high) "revertant" CD4 memory T cells provide help for memory B cells
E B Bell1, S Hayes, M McDonagh
1Immunology Research Group, Biological Sciences, Manchester University Medical School, Manchester, GB. eric.bell@man.ac.uk
European Journal of Immunology
|June 1, 2001
Summary
Distinct CD4 memory T cell states dictate B cell antibody production. Antigen-experienced CD4 T cells can revert to a naive state, influencing the speed, size, and longevity of memory B cell responses.
Area of Science:
- Immunology
- Cellular Immunology
- T cell and B cell interactions
Background:
- B cell activation and memory formation require CD4 T cell help.
- The specific role of distinct memory CD4 T cell subsets in programming memory B cells for antibody synthesis remains unclear.
Purpose of the Study:
- To investigate whether antigen-experienced memory CD4 T cells are necessary for memory B cell antibody production.
- To evaluate the impact of different CD4 T cell phenotypes (naive vs. memory) on memory B cell responses.
Main Methods:
- Utilized an adoptive transfer model to study B cell activation.
- Compared CD4 T cell help from lymphocytes of primed and unprimed donors with naive (CD45Rhigh) or memory (CD45Rlow) phenotypes.
- Assessed antibody production by memory B cells stimulated with different CD4 T cell subsets.
Main Results:
- Memory B cells produced antibodies with CD4 T cell help from both naive and memory subsets.
- CD4 T cells expressing a memory phenotype (CD45Rlow) induced rapid and large antibody responses.
- Antigen-primed CD45Rlow CD4 T cells reverted to a CD45Rhigh resting state over time, unless antigen persisted.
Conclusions:
- CD4 memory T cells exist in at least two functional states (CD45Rhigh and CD45Rlow).
- These distinct CD4 T cell states differentially regulate the kinetics, magnitude, and duration of memory B cell antibody synthesis.
- The functional state of CD4 memory T cells is dynamic and influenced by antigen availability.