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Gag-CD8 + T cell responses are associated with immune control of HIV infection. Since during HIV infection Nef impairs T cell responses, we evaluated whether deletion of nef from a non-infectious HIV DNA vaccine (Δ4 Nef(+)), creating Δ5 Nef(−), would affect its immunogenicity. When compared with Δ4, mice injected with Δ5 developed significantly lower CD8 + T cell responses to Gag,...
Caprine arthritis encephalitis virus (CAEV) is the natural lentivirus of goats, well known for its tropism for macrophages and its inability to cause infection in lymphocytes. The viral genome lacks nef, tat, vpu and vpx coding sequences. To test the hypothesis that when nef is expressed by the viral genome, the virus became toxic for lymphocytes during replication in macrophages, we inserted the...
The depletion of CD4+ T-lymphocytes central to the immunodeficiency in acquired immunodeficiency syndrome (AIDS) is largely mediated by apoptosis of both infected and uninfected cells, but the mechanisms involved and the viral proteins responsible are still poorly characterized. It has recently been suggested that, in human and simian immunodeficiency virus (HIV) and SIV, Vpr is a major modulator...
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