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Human adenovirus type 5 recombinants expressing simian immunodeficiency virus macaque strain gag antigens
C Caravokyri1, C R Pringle, K N Leppard
1Department of Biological Sciences, University of Warwick, Coventry, U.K.
Abstract:
The p55 gag gene of simian immunodeficiency virus macaque strain (SIVmac) and the core p27 gag component linked to a synthetic AUG codon have been cloned into adenovirus type 5 vectors to generate either viable E3-replacement or defective E1-replacement viruses. The viruses express the expected SIV proteins in both human and, for the non-defective viruses, monkey cells. A considerable proportion of the p55 produced is exported from the infected cell. These viruses should prove useful both in studies of the immune response to SIV and as components of candidate vaccines aimed specifically at provoking cytotoxic T cell responses.
Insights
Researchers created adenovirus vectors expressing simian immunodeficiency virus (SIV) gag proteins. These engineered viruses effectively express SIV proteins and are useful for studying immune responses and developing vaccines against SIV.
Area of Science:
- Virology
- Immunology
- Molecular Biology
Background:
- Simian immunodeficiency virus (SIV) is a lentivirus that infects macaques and serves as a model for human immunodeficiency virus (HIV).
- Understanding SIV gene expression and immune responses is crucial for developing effective vaccines and therapies.
Purpose of the Study:
- To develop adenovirus type 5 (Ad5) vectors expressing SIV gag genes for studying SIV.
- To evaluate the expression and cellular export of SIV proteins produced by these vectors.
- To assess the utility of these vectors in SIV immunogenicity studies and vaccine development.
Main Methods:
- Cloning of the p55 gag gene from SIVmac and a p27 gag component into Ad5 vectors.
- Generation of viable E3-replacement and defective E1-replacement Ad5 viruses.
- Expression analysis of SIV proteins in human and monkey cells.
- Assessment of p55 protein export from infected cells.
Main Results:
- Successfully generated Ad5 vectors expressing SIV gag genes (p55 and p27).
- Demonstrated expression of SIV proteins in both human and monkey cells (for non-defective viruses).
- Observed significant export of the p55 protein from infected cells.
Conclusions:
- The developed Ad5-SIV vectors are effective tools for expressing SIV proteins.
- These vectors facilitate studies on SIV immune responses, particularly cytotoxic T cell responses.
- The engineered viruses show promise as components of candidate vaccines against SIV.