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Identification of CD4+ T-Cell-Stimulating Antigens by Expression Cloning
1Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, California, 94305-5111
Methods (San Diego, Calif.)
|June 1, 1996
Summary
Identifying CD4(+) T-cell antigens is crucial for vaccine development. A new method uses T cells as probes to screen DNA libraries in bacteria, successfully isolating novel antigen genes.
Area of Science:
- Immunology
- Molecular Biology
- Vaccine Development
Background:
- Identifying CD4(+) T-cell antigens is vital for rational vaccine design.
- Conventional methods for antigen identification are limited.
- CD4(+) T cells play a critical role in adaptive immunity and vaccine responses.
Purpose of the Study:
- To develop a novel strategy for identifying CD4(+) T-cell-stimulating antigen genes.
- To overcome limitations of existing methods for antigen discovery.
- To enable efficient screening of DNA libraries for T-cell antigens.
Main Methods:
- Utilized antigen-specific, lacZ-expressing T cells as single-cell probes.
- Screened a DNA library using recombinant Escherichia coli (E. coli).
- Isolated antigen genes from E. coli clones that induced T-cell activation upon macrophage presentation.
Main Results:
- Successfully identified CD4(+) T-cell-stimulating antigen genes using the novel strategy.
- Isolated a previously unknown Listeria gene product.
- The identified gene product exhibited characteristics of a membrane-bound lipoprotein.
Conclusions:
- The described strategy is effective for identifying novel CD4(+) T-cell antigens.
- This approach facilitates the discovery of new vaccine targets.
- The method has potential applications in infectious disease research and vaccine development.