Unique roles of co-receptor-bound LCK in helper and cytotoxic T cells.
Nat Immunol
; 24(1): 174-185, 2023 01.
Article
em En
| MEDLINE
| ID: mdl-36564464
ABSTRACT
The kinase LCK and CD4/CD8 co-receptors are crucial components of the T cell antigen receptor (TCR) signaling machinery, leading to key T cell fate decisions. Despite decades of research, the roles of CD4-LCK and CD8-LCK interactions in TCR triggering in vivo remain unknown. In this study, we created animal models expressing endogenous levels of modified LCK to resolve whether and how co-receptor-bound LCK drives TCR signaling. We demonstrated that the role of LCK depends on the co-receptor to which it is bound. The CD8-bound LCK is largely dispensable for antiviral and antitumor activity of cytotoxic T cells in mice; however, it facilitates CD8+ T cell responses to suboptimal antigens in a kinase-dependent manner. By contrast, the CD4-bound LCK is required for efficient development and function of helper T cells via a kinase-independent stabilization of surface CD4. Overall, our findings reveal the role of co-receptor-bound LCK in T cell biology, show that CD4- and CD8-bound LCK drive T cell development and effector immune responses using qualitatively different mechanisms and identify the co-receptor-LCK interactions as promising targets for immunomodulation.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Linfócitos T Citotóxicos
/
Proteína Tirosina Quinase p56(lck) Linfócito-Específica
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article