CD28 negative T cells: is their loss our gain?
1Department of Surgery, Emory University, Atlanta, GA.
Summary
T cells can lose CD28 costimulation during activation, becoming CD28- T cells. These cells are differentiated and play varied roles in disease and transplantation, impacting immune responses.
Area of Science:
- Immunology
- Cellular Biology
- Transplantation Science
Background:
- CD28 is a key costimulatory molecule crucial for T cell activation.
- Some T cells lose CD28 during activation, becoming CD28- T cells, which are antigen-experienced and highly differentiated.
- CD28- T cells exhibit functional heterogeneity, ranging from cytotoxic to regulatory roles, indicating CD28 loss as a marker of advanced differentiation.
Purpose of the Study:
- To explore the functional heterogeneity of CD28- T cells.
- To understand the role of CD28- T cells in various human diseases, including infections, cancers, and inflammatory conditions.
- To investigate the significance of CD28 loss in solid organ transplantation and its implications for immune management.
Main Methods:
- Characterization of distinct CD28- T cell populations.
- Analysis of T cell differentiation markers and functional assays.
- Investigation of CD28- T cell roles in disease models and transplantation contexts.
Main Results:
- CD28- T cells are functionally diverse, with roles in both immune enhancement and regulation.
- CD28 loss is associated with advanced T cell differentiation.
- Specific CD28- T cell populations influence allograft tolerance and rejection in transplantation.
Conclusions:
- CD28 loss is a marker of differentiated T cells with diverse functions.
- Understanding CD28- T cell heterogeneity is critical for managing immune responses in disease and transplantation.
- Further research into CD28- T cell determinants may aid in clinical risk stratification and personalized post-transplant immune management.
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