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The peripheral T-cell pool: regulation by non-antigen induced proliferation?
1Immunology Research Group, Biological Sciences, Manchester University Medical School, Manchester, M13 9PT, UK.
Seminars in Immunology
|February 7, 1998
Summary
The body maintains a stable T-cell pool by balancing cell growth and loss. When T-cells are depleted, they regenerate through extrathymic proliferation without needing specific antigen triggers.
Area of Science:
- Immunology
- Cell Biology
Background:
- The recirculating lymphocyte pool shows remarkable stability despite constant challenges.
- T-cell homeostasis involves a balance between lymphocyte expansion and cell death.
Purpose of the Study:
- To understand the mechanisms maintaining a stable recirculating T-cell pool.
- To investigate how T-cell deficits are restored to equilibrium.
Main Methods:
- Analysis of T-cell pool dynamics under various conditions.
- Review of recent evidence on T-cell regeneration.
Main Results:
- T-cell pool size is maintained by compensatory cell loss during expansion.
- Extrathymic T-cell division restores depleted T-cell numbers, even without deliberate provocation.
- Evidence suggests CD4 T-cell proliferation replenishes depleted compartments without specific antigen or T-cell receptor engagement.
Conclusions:
- The T-cell pool is actively maintained through a dynamic equilibrium.
- Restoration of T-cell numbers after depletion occurs via a T-cell receptor-independent proliferation mechanism.