Burgers, Wendy A. Riou, Catherine. Mlotshwa, Mandla. Maenetje, Pholo. De Assis Rosa, Debra. Brenchley, Jason. Mlisana, Koleka. Douek, Daniel C. Koup, Richard. Roederer, Mario. de Bruyn, Guy. Abdool Karim, Salim Safurdeen. Williamson, Carolyn. Gray, Clive M.
Abstract:
Understanding early immunological events during HIV-1 infection that may set the course of disease
progression is important for identifying correlates of viral control. This study explores the association
of differentiation profiles of HIV-specific and total memory CD8+ T cells with viral set point. A
cohort of 47 HIV-1-infected individuals, with differing viral set points at 12 mo, were recruited during
acute infection. We identified that the magnitude of IFN-γ+ T cell responses at 6 mo postinfection
did not associate with viral set point at 12 mo. A subset of 16 individuals was further studied to
characterize CD8+ T cells for expression patterns of markers for memory differentiation, survival
(CD127), senescence (CD57), and negative regulation (programmed death-1). We show that viral
control and the predicted tempo of HIV disease progression in the first year of infection was
associated with a synchronous differentiation of HIV-specific and total CD8+ memory
subpopulations. At 6–9 mo postinfection, those with low viral set points had a significantly higher proportion of early differentiated HIV-specific and total memory CD8+ cells of a central memory (CD45RO+CD27+CCR7+) and intermediate memory (CD45RO−CD27+CCR7−) phenotype. Those with high viral set points possessed significantly larger frequencies of effector memory (CD45RO+CD27−CCR7−) cells. The proportions of memory subsets significantly correlated with CD38+CD8+ T cells. Thus, it is likely that a high Ag burden resulting in generalized immune
activation may drive differentiation of HIV-specific and total memory CD8+ T cells.