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A molecular analysis of NKT cells: identification of a class-I restricted T cell-associated molecule (CRTAM)
J Kennedy1, A P Vicari, V Saylor
1Department of Immunology, DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, California 94304, USA.
Abstract:
cDNA library subtraction techniques were used to identify transcripts expressed by activated mouse alphabetaTCR+ CD4-CD8- (double-negative; DN) T cells, a subset of natural killer T (NKT) cells. The most frequent cDNAs identified included the chemokines TCA3, macrophage inflammatory protein-1alpha (MIP-1alpha), MIP-1beta, and lymphotactin (LPTN), the cytokines interleukin-4 (IL-4) and interferon-gamma (IFN-gamma), and a granzyme. We also identified a new member of the immunoglobulin superfamily (Ig-SF). This molecule was designated class I-restricted T cell-associated molecule (CRTAM) as a result of its restricted expression pattern in T cells. Human CRTAM was also identified, and shares the same expression pattern as the mouse molecule. LPTN and CRTAM exhibit the same expression pattern in T cells, suggesting the existence of a gene expression program common to class I-MHC-restricted T cells.
Insights
Researchers identified key genes expressed by double-negative (DN) T cells, including novel immunoglobulin superfamily member CRTAM. These findings shed light on T cell biology and potential therapeutic targets.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- Natural killer T (NKT) cells are crucial immune cells with diverse functions.
- A specific subset, double-negative (DN) T cells (TCR+ CD4-CD8-), plays a unique role in immune responses.
- Understanding the gene expression profile of DN T cells is essential for elucidating their function.
Purpose of the Study:
- To identify and characterize the transcripts expressed by activated mouse double-negative (DN) T cells.
- To discover novel molecules involved in T cell function and regulation.
- To investigate the expression patterns of identified genes in T cell populations.
Main Methods:
- Utilized cDNA library subtraction techniques to isolate differentially expressed genes.
- Performed gene expression analysis in activated mouse DN T cells.
- Identified and characterized novel genes, including a new immunoglobulin superfamily member.
Main Results:
- Identified frequent expression of chemokines (TCA3, MIP-1alpha, MIP-1beta, LPTN) and cytokines (IL-4, IFN-gamma) in DN T cells.
- Discovered a novel immunoglobulin superfamily member, designated class I-restricted T cell-associated molecule (CRTAM).
- CRTAM and lymphotactin (LPTN) share similar expression patterns in T cells, suggesting a common regulatory program.
Conclusions:
- Activated mouse DN T cells express a distinct set of immune-related genes.
- CRTAM is a novel T cell-associated molecule with restricted expression.
- Shared expression patterns of LPTN and CRTAM suggest a common gene expression program in class I-MHC-restricted T cells.