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The activation of T lymphocytes
L K Bockenstedt1, M A Goldsmith, G A Koretzky
1Department of Medicine, University of California, San Francisco.
Rheumatic Diseases Clinics of North America
|December 1, 1987
Summary
T cell activation begins with cell surface receptor-ligand interactions. The CD3/Ti complex triggers intracellular signaling pathways, leading to T cell responses like IL-2 production, with accessory molecules playing a role.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- T cell activation is initiated by cell surface ligand-receptor interactions.
- The CD3/Ti complex is central to antigen recognition, T cell receptor (TCR) signaling, and MHC recognition.
- Intracellular signaling involves phosphatidylinositol (PI) metabolism, generating inositol trisphosphate (IP3) and diacylglycerol (DG).
Purpose of the Study:
- To explore the signaling mechanisms of T cell activation.
- To investigate the role of the CD3/Ti complex in antigen-induced T cell responses.
- To understand the contribution of accessory molecules in T cell activation.
Main Methods:
- The study focuses on the biochemical and genetic pathways of T cell activation.
- Analysis of signal transduction initiated by the CD3/Ti complex.
- Investigating the generation of second messengers like IP3 and DG from PI metabolism.
Main Results:
- CD3/Ti complex triggering leads to IP3 and DG production.
- These second messengers increase intracellular calcium ([Ca2+]i) and activate protein kinase C (PKC).
- These events are linked to cellular responses, including interleukin-2 (IL-2) production.
Conclusions:
- The CD3/Ti complex is crucial for T cell activation and signal transduction.
- Intracellular events, including calcium flux and PKC activation, are key to T cell responses.
- Further research is needed to elucidate the roles of accessory molecules and downstream signaling pathways in T cell activation and gene expression.