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Multivalent structure of an alphabetaT cell receptor
G Fernández-Miguel1, B Alarcón, A Iglesias
1Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, Department of Medicine, Alcalá University, Velázquez 144, Madrid, E-28006, Spain.
Summary
This study reveals that T cells can possess multiple T cell antigen receptors (TCRs) within a single TCR/CD3 complex. These findings challenge previous understandings of TCR structure and function in immune responses.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- The stoichiometry of T cell antigen receptor (TCR)/CD3 complexes is crucial for T cell activation.
- A long-standing debate exists regarding whether a single TCR/CD3 complex contains one or multiple TCR recognition modules.
Purpose of the Study:
- To investigate the presence and implications of multiple TCRs within a single TCR/CD3 complex.
Main Methods:
- Utilized transgenic mice co-expressing distinct TCRbeta chains.
- Employed immunoprecipitation, immunoblotting, fluorescence resonance energy transfer (FRET), and comodulation assays.
- Analyzed T cells ex vivo and after in vitro expansion.
Main Results:
- Demonstrated that T cells can incorporate at least two alphabetaTCRs into a single TCR/CD3 complex.
- Provided evidence for bispecific alphabetaTCRs using various biochemical and biophysical techniques.
- Observed these multivalent (alphabeta)2TCR/CD3 complexes on the surface of living T cells.
Conclusions:
- The findings support the existence of multivalent TCR/CD3 complexes, challenging the notion of a single TCR module per complex.
- Discusses the potential implications for T cell activation, coreceptor engagement, and immune signaling pathways.