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Cytotoxic T lymphocyte responses to conserved proteins such as Gag within HIV- or SIV-infected hosts can facilitate partial control of viremia. However, the utility of targeting variable viral proteins by CTL responses is unclear. We studied CTL responses to regulatory and accessory proteins of SIV in pigtail macaques. The regulatory and accessory proteins were the most commonly targeted proteins...
CD4 + T lymphocyte subsets are targeted to different degrees by SIV infection. We studied central memory, effector memory, naïve, and regulatory T cell levels longitudinally in 11 SIV mac251 -infected pigtail macaques. Depletion of CD28 + CD95 + central memory CD4 + T cells, but not other populations, correlated with both SIV viral load and disease progression...
Simple and effective delivery methods for cellular immunotherapies are needed. We assessed ex vivo pulsing of overlapping SIV Gag 15mer peptides onto either whole blood or PBMC in 15 randomly assigned SIV-infected macaques. Both delivery methods were safe and immunogenic, stimulating high levels of broad and polyfunctional Gag-specific CD4 and CD8 T cells. Delivery of overlapping Gag peptides via...
Persistent gag-specific T cell immunity would be a useful component of an effective HIV vaccine. The Flavivirus Kunjin replicon was previously engineered to persistently express HIV gag and was shown to induce protective responses in mice. We evaluated Kunjin replicon virus-like-particles expressing SIVgag–pol in pigtail macaques. Kunjin-specific antibodies were induced, but no SIV-specific T cell...
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