Autospecific gammadelta thymocytes that escape negative selection find sanctuary in the intestine
Summary
This summary is machine-generated.Neonatal mice show reduced negative selection of self-reactive T cells. This allows potentially autoreactive gammadelta T cells to escape the thymus and persist in the gut, with implications for autoimmune disease.
Area Of Science
- Immunology
- T-cell development
- Autoimmunity
Background
- T-cell receptors (TCRs) on T cells recognize antigens (Ag).
- Autospecific T cells recognize self-antigens and are normally eliminated via negative selection in the thymus.
- Gammadelta T cells are a subset of T cells with distinct TCRs.
Purpose Of The Study
- To investigate the process of negative selection for gammadelta T cells.
- To model negative selection using G8 gammadelta T cell transgenic mice.
- To understand the fate of autospecific gammadelta T cells in neonatal versus adult thymuses.
Main Methods
- Utilized G8 gammadelta T cell transgenic mice expressing a specific gammadelta TCR.
- Compared negative selection efficiency in neonatal and adult thymuses.
- Investigated extrathymic differentiation and survival of T cells in the intestinal epithelium.
Main Results
- Negative selection of autospecific gammadelta T cells is nearly complete in adult thymuses.
- Negative selection is significantly attenuated in neonatal thymuses.
- Self-reactive gammadelta T cells escape neonatal negative selection and differentiate in the gut, requiring the intestinal environment and self-antigen presence.
Conclusions
- Neonatal immune development allows escape of potentially self-reactive T cells.
- The intestinal environment and self-antigens are crucial for the survival of escaped autoreactive T cells.
- Findings suggest mechanisms contributing to the development and persistence of autoreactive T cells in autoimmune conditions.
View abstract on PubMed