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LAT regulates gammadelta T cell homeostasis and differentiation
Selene Nuñez-Cruz1, Enrique Aguado, Sylvie Richelme
1Centre d'Immunologie de Marseille-Luminy, Institut National de la Santé et de la Recherche Médicale-Centre National de la Recherche Scientifique-Université de la Méditerranée, Parc Scientifique de Luminy, Case 906, 13288 Marseille Cedex 9, France.
Nature Immunology
|September 13, 2003
Summary
The linker for activation of T cells (LAT) is crucial for T cell signaling. Mutations in LAT disrupt T cell development and homeostasis, leading to chronic cytokine production and altered immunoglobulin secretion.
Area of Science:
- Immunology
- Molecular Biology
- Cellular Signaling
Background:
- The linker for activation of T cells (LAT) is a key adaptor protein in T cell receptor (TCR) signaling.
- LAT's role in T cell development and immune homeostasis is critical for maintaining immune system balance.
Purpose of the Study:
- To investigate the impact of specific C-terminal LAT tyrosine residue mutations on T cell development and function.
- To elucidate the role of LAT in regulating T cell homeostasis and terminal differentiation.
Main Methods:
- Utilized genetically modified mice homozygous for mutations in the C-terminal LAT tyrosine residues.
- Analyzed T cell development (alphabeta and gammadelta T cells) in spleen and lymph nodes.
- Assessed cytokine production (T helper type 2) and plasma cell maturation (IgE, IgG1).
Main Results:
- Homozygous C-terminal LAT tyrosine mutants exhibited a developmental block in alphabeta T cells.
- A partial impairment in gammadelta T cell development was observed.
- Accumulation of gammadelta T cells producing high levels of T helper type 2 cytokines and promoting IgE and IgG1 secreting plasma cells was noted without immunization.
Conclusions:
- LAT is essential for normal T cell development and homeostasis.
- Specific LAT mutations can lead to aberrant T cell activation and skewed immune responses.
- LAT plays a critical role in regulating T cell differentiation pathways.