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Comparative Cell-Mediated Immunogenicity of DNA/DNA, DNA/Adenovirus Type 5 (Ad5), or Ad5/Ad5 HIV-1 Clade B gag Vaccine Prime-Boost Regimens.
- Source :
-
Journal of Infectious Diseases . 1/1/2010, Vol. 201 Issue 1, p132-141. 10p. 4 Charts, 2 Graphs. - Publication Year :
- 2010
-
Abstract
- Background. We report composite results from the Merck phase I program of near-consensus clade B human immunodeficiency virus (HIV) type 1 gag vaccines. Methods. Healthy HIV-uninfected adults were enrolled in 6 blinded placebo-controlled studies evaluating the immunogenicity of (1) a 4-dose regimen of a DNA vaccine, (2) a 3-dose priming regimen of the DNA vaccine with a booster dose of an adenovirus type 5 (Ad5)-vectored vaccine, or (3) a 3-dose regimen of the Ad5 vaccine. The DNA plasmid was provided with or without an aluminum phosphate or CRL1005 adjuvant. The primary end point was the unfractionated HIV-1 gag-specific interferon γ enzyme-linked immunospot (ELISpot) response 4 weeks after the final dose. Results. Overall, 254 (83%) of 307 subjects randomized to the vaccine groups were evaluable. Adjuvants did not enhance immunogenicity of the DNA vaccine. Postboost ELISpot responder frequencies were higher for Ad5-containing regimens than for the DNA/DNA regimen (33%) but were similar for DNA/Ad5 (55%) and Ad5/Ad5 (50%). DNA/DNA elicited mainly a CD4 response, whereas Ad5/Ad5 elicited mainly a CD8 response; DNA/Ad5 generated CD4 and CD8 responses comparable to those of DNA/DNA and Ad5/Ad5, respectively. Conclusions. The DNA vaccine alone or as a priming regimen for the Ad5 vaccine did not increase unfractionated ELISpot responses compared with the Ad5 vaccine alone. Qualitative T cell responses to different vaccine regimens deserve further study. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00221899
- Volume :
- 201
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Journal of Infectious Diseases
- Publication Type :
- Academic Journal
- Accession number :
- 47363143
- Full Text :
- https://doi.org/10.1086/648591