Immunization with HIV-1 envelope T20-encoding DNA vaccines elicits cross-clade neutralizing antibody responses

S. Stenler, K. E. Lundin, L. Hansen, S. Petkov, N. Mozafari, M. Isaguliants, P. Blomberg, C. I.E. Smith, D. M. Goldenberg, C. H. Chang, K. Ljungberg, J. Hinkula, B. Wahren

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Background: Genetic immunization is expected to induce the expression of antigens in a native form. The encoded peptide epitopes are presented on endogenous MHC molecules, mimicking antigen presentation during a viral infection. We have explored the potential of enfuvirtide (T20), a short HIV peptide with antiviral properties, to enhance immune response to HIV antigens. To generate an expression vector, the T20 sequence was cloned into a conventional plasmid, the novel minicircle construct, and a replicon plasmid. In addition, 3 conventional plasmids that express the envelope of HIV-1 subtypes A, B and C and contain T20 in their gp41 sequences were also tested. Results: All combinations induced HIV-specific antibodies and cellular responses. The addition of T20 as a peptide and as an expression cassette in the 3 DNA vectors enhanced antibody responses. The highest anti-HIV-1 Env titers were obtained by the replicon T20 construct. This demonstrates that besides its known antiviral activity, T20 promotes immune responses. We also confirm that the combination of slightly divergent antigens improves immune responses. Conclusions: The antiretroviral T20 HIV-1 sequence can be used as an immunogen to elicit binding and neutralizing antibodies against HIV-1. These, or similarly modified gp41 genes/peptides, can be used as priming or boosting components for induction of broadly neutralizing anti-HIV antibodies. Future comparative studies will reveal the optimal mode of T20 administration.

Original languageEnglish
Pages (from-to)2849-2858
Number of pages10
JournalHuman Vaccines and Immunotherapeutics
Volume13
Issue number12
DOIs
Publication statusPublished - 14 Nov 2017
Externally publishedYes

Keywords

  • DNAimmunology
  • Enfuvirtide
  • Genetic vectors
  • HIV-1 membrane proximal
  • Minicircle
  • Replicon vector

Field of Science

  • 3.1 Basic medicine

Publication Type

  • 1.1. Scientific article indexed in Web of Science and/or Scopus database

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