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A small number of HIV-infected individuals known as elite controllers experience low levels of chronic phase viral replication and delayed progression to AIDS. Specific HLA class I alleles are associated with elite control, implicating CD8(+) T lymphocytes in the establishment of these low levels of viral replication. Most HIV-infected individuals that express protective HLA class I alleles, however, do not control viral replication. Approximately 50% of Mamu-B*00801(+) Indian rhesus macaques control SIVmac239 replication in the chronic phase in a manner that resembles elite control in humans. We followed both the immune response and viral evolution in SIV-infected Mamu-B*00801(+) animals to better understand the role of CD8(+) T lymphocytes during the acute phase of viral infection, when viral control status is determined. The virus escaped from immunodominant Vif and Nef Mamu-B*00801-restricted CD8(+) T lymphocyte responses during the critical early weeks of acute infection only in progressor animals that did not control viral replication. Thus, early CD8(+) T lymphocyte escape is a hallmark of Mamu-B*00801(+) macaques who do not control viral replication. By contrast, virus in elite controller macaques showed little evidence of variation in epitopes recognized by immunodominant CD8(+) T lymphocytes, implying that these cells play a role in viral control.

Escape from CD8+ T Cell Responses in Mamu-B*00801+ Macaques Differentiates Progressors from Elite Controllers

Escape from CD8+ T Cell Responses in Mamu-B00801*+ Macaques Differentiates Progressors from Elite Controllers