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* Program in Infectious Diseases, Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109; and Departments of
Medicine and
Laboratory Medicine, University of Washington, Seattle, WA 98195
Induction of HIV-1-specific CD8+ T cells during acute infection is associated with a decline in viremia. The role CD8+ effectors play in subsequently establishing viral set point remains unclear. To address this, we focused on two acutely infected patients with the same initial Tat-specific CD8+ response, analyzing their CD8+ T cell responses longitudinally in conjunction with viral load and sequence evolution. In one patient initiating treatment during acute infection, the frequencies of Tat-specific CD8+ T cells gradually diminished but persisted, and the Tat epitope sequence was unaltered. By contrast, in the second patient who declined treatment, the Tat-specific CD8+ T cells disappeared below detection, in conjunction with Gag-specific CD4+ T cell loss, as plasma viremia reached a set point. This coincided with the emergence of an escape variant within the Tat epitope and an additional Vpr epitope. New CD8+ T cell responses emerged but with no further associated decline in viremia. These findings indicate that, in the absence of treatment, the initial CD8+ T cell responses have the greatest impact on reducing viremia, and that later, continuously evolving responses are less efficient in further reducing viral load. The results also suggest that T cell help may contribute to the antiviral efficiency of the acute CD8+ T cell response.
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