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Magnitude and Breadth of the Neutralizing Antibody Response in the RV144 and Vax003 HIV-1 Vaccine Efficacy Trials

Open access
Montefiori, D. C., Karnasuta, C., Huang, Y., Ahmed, H., Gilbert, P., de Souza, M. S., McLinden, R., Tovanabutra, S., Laurence-Chenine, A., Sanders-Buell, E., Moody, M. A., Bonsignori, M., Ochsenbauer, C., Kappes, J., Tang, H., Greene, K., Gao, H., LaBranche, C. C., Andrews, C., Polonis, V. R., Rerks-Ngarm, S., Pitisuttithum, P., Nitayaphan, S., Kaewkungwal, J., Self, S. G., Berman, P. W., Francis, D., Sinangil, F., Lee, C., Tartaglia, J., Robb, M. L., Haynes, B. F., Michael, N. L., Kim, J. H.·2012·Journal of Infectious Diseases

Abstract

BACKGROUND: A recombinant canarypox vector expressing human immunodeficiency virus type 1 (HIV-1) Gag, Pro, and membrane-linked gp120 (vCP1521), combined with a bivalent gp120 protein boost (AIDSVAX B/E), provided modest protection against HIV-1 infection in a community-based population in Thailand (RV144 trial). No protection was observed in Thai injection drug users who received AIDSVAX B/E alone (Vax003 trial). We compared the neutralizing antibody response in these 2 trials. METHODS: Neutralization was assessed with tier 1 and tier 2 strains of virus in TZM-bl and A3R5 cells. RESULTS: Neutralization of several tier 1 viruses was detected in both RV144 and Vax003. Peak titers were higher in Vax003 and waned rapidly in both trials. The response in RV144 was targeted in part to V3 of gp120.vCP1521 priming plus 2 boosts with gp120 protein was superior to 2 gp120 protein inoculations alone, confirming a priming effect for vCP1521. Sporadic weak neutralization of tier 2 viruses was detected only in Vax003 and A3R5 cells. CONCLUSION: The results suggest either that weak neutralizing antibody responses can be partially protective against HIV-1 in low-risk heterosexual populations or that the modest efficacy seen in RV144 was mediated by other immune responses, either alone or in combination with neutralizing antibodies.

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Authors
Montefiori, D. C., Karnasuta, C., Huang, Y., Ahmed, H., Gilbert, P., de Souza, M. S., McLinden, R., Tovanabutra, S., Laurence-Chenine, A., Sanders-Buell, E., Moody, M. A., Bonsignori, M., Ochsenbauer, C., Kappes, J., Tang, H., Greene, K., Gao, H., LaBranche, C. C., Andrews, C., Polonis, V. R., Rerks-Ngarm, S., Pitisuttithum, P., Nitayaphan, S., Kaewkungwal, J., Self, S. G., Berman, P. W., Francis, D., Sinangil, F., Lee, C., Tartaglia, J., Robb, M. L., Haynes, B. F., Michael, N. L., & Kim, J. H.
Venue
Journal of Infectious Diseases
Published
2012-05-25
Volume
206
Issue
3
Pages
431-441
ISSN
  • 0022-1899 (ISSN-L)
  • 1537-6613
OpenAlex
W2108823547
Cited by
284
References
2
FWCI
17.39
Type
journal article
Language
en
Open access
hybrid

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Montefiori, D. C., Karnasuta, C., Huang, Y., Ahmed, H., Gilbert, P., de Souza, M. S., McLinden, R., Tovanabutra, S., Laurence-Chenine, A., Sanders-Buell, E., Moody, M. A., Bonsignori, M., Ochsenbauer, C., Kappes, J., Tang, H., Greene, K., Gao, H., LaBranche, C. C., Andrews, C., . . . Kim, J. H. (2012). Magnitude and Breadth of the Neutralizing Antibody Response in the RV144 and Vax003 HIV-1 Vaccine Efficacy Trials. Journal of Infectious Diseases. https://doi.org/10.1093/infdis/jis367

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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