X4 human immunodeficiency virus type 1 gp120 down-modulates expression and immunogenicity of codelivered antigens

Avi Hai Hovav, Michael Santosuosso, Maytal Bivas-Benita, Andre Plair, Alex Cheng, Mazal Elnekave, Elda Righi, Tao Chen, Satoshi Kashiwagi, Michael W. Panas, Shi Hua Xiang, Karina Furmanov, Norman L. Letvin, Mark C. Poznansky

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

In order to increase the immune breadth of human immunodeficiency virus (HIV) vaccines, strategies such as immunization with several HIV antigens or centralized immunogens have been examined. HIV-1 gp120 protein is a major immunogen of HIV and has been routinely considered for inclusion in both present and future AIDS vaccines. However, recent studies proposed that gp120 interferes with the generation of immune response to codelivered antigens. Here, we investigate whether coimmunization with plasmid-encoded gp120 alters the immune response to other coadministered plasmid encoded antigens such as luciferase or ovalbumin in a mouse model. We found that the presence of gp120 leads to a significant reduction in the expression level of the codelivered antigen in vivo. Antigen presentation by antigen-presenting cells was also reduced and resulted in the induction of weak antigen-specific cellular and humoral immune responses. Importantly, gp120-mediated immune interference was observed after administration of the plasmids at the same or at distinct locations. To characterize the region in gp120 mediating these effects, we used plasmid constructs encoding gp120 that lacks the V1V2 loops (ΔV1V2) or the V3 loop (ΔV3). After immunization, the ΔV1V2, but not the V3 construct, was able to reduce antigen expression, antigen presentation, and subsequently the immunogenicity of the codelivered antigen. The V3 loop dependence of this phenomenon seems to be limited to V3 loops known to interact with the CXCR4 molecule but not with CCR5. Our study presents a novel mechanism by which HIV-1 gp120 interferes with the immune response against coadministered antigen in a polyvalent vaccine preparation.

Original languageEnglish (US)
Pages (from-to)10941-10950
Number of pages10
JournalJournal of virology
Volume83
Issue number21
DOIs
StatePublished - Nov 2009

ASJC Scopus subject areas

  • Microbiology
  • Immunology
  • Insect Science
  • Virology

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    Hovav, A. H., Santosuosso, M., Bivas-Benita, M., Plair, A., Cheng, A., Elnekave, M., Righi, E., Chen, T., Kashiwagi, S., Panas, M. W., Xiang, S. H., Furmanov, K., Letvin, N. L., & Poznansky, M. C. (2009). X4 human immunodeficiency virus type 1 gp120 down-modulates expression and immunogenicity of codelivered antigens. Journal of virology, 83(21), 10941-10950. https://doi.org/10.1128/JVI.00394-09