Characterization of functional and phenotypic changes in anti-Gag vaccine-induced T cell responses and their role in protection after HIV-1 infection

Academic Article

Abstract

  • Worldwide HIV-1 vaccine efforts are guided by the principle that HIV-specific T cell responses may provide protection from infection or delay overt disease. However, no clear correlates of T cell-mediated immune protection have been identified. Here, we examine in a HLA-B27+ HIV seronegative vaccinee persistent HIV-specific vaccine-induced anti-Gag CD4 + and CD8+ T cell responses. Although these responses exhibited those characteristics (multifunctionality, appropriate memory phenotype, and targeting of epitopes associated with long-term nonprogression) predicted to correlate with protection from infection, the subject became HIV infected. After HIV infection, the vaccine-induced CD8+ T cells expanded, but both CD4+ and CD8+ T cell responses acquired the functional and phenotypic patterns characteristic of chronic HIV infection. The virus quickly escaped the vaccine-induced T cell response, and the subject progressed more rapidly than expected for someone expressing the HLA-B27 allele. These data suggest that control of HIV by vaccine-elicited HIV-specific T cell responses may be difficult, even when the T cell response has those characteristics predicted to provide optimal protection. © 2005 by The National Academy of Sciences of the USA.
  • Digital Object Identifier (doi)

    Author List

  • Betts MR; Exley B; Price DA; Bansal A; Camacho ZT; Teaberry V; West SM; Ambrozak DR; Tomaras G; Roederer M
  • Start Page

  • 4512
  • End Page

  • 4517
  • Volume

  • 102
  • Issue

  • 12