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Cloning and characterization of GITR ligand.
Genes and Immunity
|December 4, 2003
Summary
Researchers cloned and characterized the gene for the glucocorticoid-induced tumor necrosis factor receptor ligand (GITRL). This ligand, expressed by dendritic cells, binds GITR and inhibits regulatory T-cell activity.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- Glucocorticoid-induced tumor necrosis factor receptor (GITR) plays a role in immune regulation.
- The natural ligand for murine GITR was previously uncharacterized.
Purpose of the Study:
- To clone and characterize the gene encoding the natural ligand of murine GITR.
- To investigate the function and expression of the GITR ligand (GITRL).
Main Methods:
- Gene cloning and sequencing.
- Protein characterization and expression analysis in HEK 293 cells.
- NF-kappaB activation assays.
- Functional studies using soluble CD8-GITRL and regulatory T cells.
Main Results:
- The gene for GITRL was successfully cloned and characterized, revealing a type II membrane protein.
- GITRL expression is specific to splenic dendritic cells.
- GITRL binds to GITR and activates NF-kappaB signaling.
- Soluble GITRL demonstrated the ability to inhibit the suppressive functions of CD4+CD25+ regulatory T cells.
Conclusions:
- GITRL is a novel immune regulatory molecule expressed by dendritic cells.
- GITRL interaction with GITR has implications for modulating T-cell responses, particularly regulatory T cells.
- These findings open new avenues for understanding immune homeostasis and developing immunotherapies.