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Open Access Research

The HIV-1 gp120/V3 modifies the response of uninfected CD4 T cells to antigen presentation: mapping of the specific transcriptional signature

Antigone K Morou1, Filippos Porichis2, Elias Krambovitis3, George Sourvinos1, Demetrios A Spandidos1 and Alexandros Zafiropoulos4*

Author Affiliations

1 Department of Virology, Medical School, University of Crete, Heraklion, Crete, Greece

2 Ragon Institute of Massachusetts, General Hospital, Massachusetts Institute of Technology and Harvard University, Charlestown, Massachusetts, USA

3 Faculty of Veterinary Medicine, University of Thessaly, Trikalon 224, GR-43100 Karditsa, Greece

4 Department of Histology-Embryology, Medical School, University of Crete, Heraklion, Crete, Greece, Voutes, Heraklion, 71409 Crete, Greece

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Journal of Translational Medicine 2011, 9:160  doi:10.1186/1479-5876-9-160

Published: 24 September 2011

Abstract

Background

The asymptomatic phase of HIV-1 infection is characterized by a progressive depletion of uninfected peripheral effector/memory CD4+ T cells that subsequently leads to immune dysfunction and AIDS symptoms. We have previously demonstrated that the presence of specific gp120/V3 peptides during antigen presentation can modify the activation of normal T-cells leading to altered immune function. The aim of the present study was to map the specific transcriptional profile invoked by an HIV-1/V3 epitope in uninfected T cells during antigen presentation.

Methods

We exposed primary human peripheral blood monocytes to V3 lipopeptides using a liposome delivery system followed by a superantigen-mediated antigen presentation system. We then evaluated the changes in the T-cell transcriptional profile using oligonucleotide microarrays and performed Ingenuity Pathway Analysis (IPA) and DAVID analysis. The results were validated using realtime PCR, FACS, Western blotting and immunofluorescence.

Results

Our results revealed that the most highly modulated transcripts could almost entirely be categorized as related to the cell cycle or transcriptional regulation. The most statistically significant enriched categories and networks identified by IPA were associated with cell cycle, gene expression, immune response, infection mechanisms, cellular growth, proliferation and antigen presentation. Canonical pathways involved in energy and cell cycle regulation, and in the co-activation of T cells were also enriched.

Conclusions

Taken together, these results document a distinct transcriptional profile invoked by the HIV-1/V3 epitope. These data could be invaluable to determine the underlying mechanism by which HIV-1 epitopes interfere with uninfected CD4+ T-cell function causing hyper proliferation and AICD.