Long-term effects of intermittent interleukin 2 therapy in patients with HIV infection: characterization of a novel subset of CD4(+)/CD25(+) T cells.

Journal Article

The long-term immunologic effects of intermittent interleukin 2 (IL-2) therapy were evaluated in a cross-sectional study by comparing 3 groups: HIV-seronegative volunteers, HIV-infected (HIV(+)) patients receiving highly active antiretroviral therapy (HAART), and HIV(+) patients receiving HAART and intermittent IL-2. Whole-blood immunophenotyping was performed to study expression of the IL-2 receptor chains on T lymphocytes and natural killer cells and to further characterize CD4(+)/CD25(+) T cells. Increased CD25 expression, especially in CD4(+) T cells but also in CD8(+) T cells, without increases in expression of the beta and gamma chains of the IL-2 receptor was detected in the IL-2 group. Up to 79% of naive CD4(+) T cells (median, 61%) from patients in the IL-2 group expressed CD25, and the number of naive CD4(+)/CD25(+) T cells correlated positively with both the total and naive CD4(+) T-cell counts. A discrete population of CD45 double intermediate RA(+)/RO(+) CD4(+) cells was also preferentially expanded in the IL-2 group, and the number of these cells strongly correlated with the total CD4(+) count. Despite increases in CD25 expression, T lymphocytes from patients treated with IL-2 did not have increased expression of early (CD69) or late (CD95) activation markers or evidence of recent proliferation (Ki67). Both CD4(+)/CD25(+) and CD4(+)/CD25(-) cells from IL-2-treated HIV(+) patients proliferated in response to mitogens, specific antigens, and T-cell-receptor-mediated stimuli. Thus, intermittent administration of IL-2 in HIV(+) patients leads to preferential expansion of a unique subset of CD4(+) T cells that may represent a critical population in T-cell homeostasis.

Duke Authors

Cited Authors

  • Sereti, I; Martinez-Wilson, H; Metcalf, JA; Baseler, MW; Hallahan, CW; Hahn, B; Hengel, RL; Davey, RT; Kovacs, JA; Lane, HC

Published Date

  • September 2002

Published In

Volume / Issue

  • 100 / 6

Start / End Page

  • 2159 - 2167

PubMed ID

  • 12200381

Electronic International Standard Serial Number (EISSN)

  • 1528-0020

International Standard Serial Number (ISSN)

  • 0006-4971

Language

  • eng