Cellular cytotoxic response induced by DNA vaccination in HIV-1-infected patients

Sandra Calarota, Göran Bratt, Siv Nordlund, Jorma Hinkula, Ann Charlotte Leandersson, Eric Sandström, Britta Wahren

Research output: Contribution to journalArticlepeer-review

Abstract

Background. DNA vaccination is known to generate immune responses against HIV-1 in animal models. We aimed to assess the efficacy of DNA vaccination in induction of immune responses in HIV-1-infected human beings. Methods. Nine symptom-free HIV-1-infected patients were immunised with DNA constructs encoding the nef, rev, or tat regulatory genes of HIV-1. The patients were selected for having no or low antibody reactivities to these antigens. HIV-1-specific cytotoxic T-lymmphocytes (CTLs), precursor frequencies, and antigen-specific proliferative responses were measured before, during, and after three immunisations over 6 months. Findings. Cellular immune reactivities against the HIV-1 regulatory proteins were absent or low before DNA immunisation. DNA vaccination induced detectable memory cells in all patients and specific cytotoxicity in eight patients. CTLs were MHC-class-I restricted and mainly of CD8+ origin. In three patients the cellular activity was transient, decreasing after an initial response. Interpretation. DNA immunisation with HIV-1 genes can induce specific cellular responses in human beings with no apparent side-effects. It is theoretically possible that HIV-1-specific cytotoxic responses to regulatory proteins could lead to infected cells being eliminated before they have released new viral particles. However, it is possible that the patients we selected responded less than would non-selected or non-infected individuals. The small number of patients presented here does not allow generalisation of our findings.

Original languageEnglish
Pages (from-to)1320-1325
Number of pages6
JournalLancet
Volume351
Issue number9112
DOIs
Publication statusPublished - May 2 1998

ASJC Scopus subject areas

  • Medicine(all)

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