The Journal of Experimental Medicine
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Published 10 December 2001. doi:10.1084/jem.194.12.1731
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© Rockefeller University Press, 0022-1007/2001/12/1731/ $5.00
The Journal of Experimental Medicine, Volume 194, Number 12, December 17, 2001 1731-1741


Original Article

Identification of Dynamically Distinct Subpopulations of T Lymphocytes That Are Differentially Affected by HIV

Joseph A. Kovacs1, Richard A. Lempicki5, Igor A. Sidorov3, Joseph W. Adelsberger5, Betsey Herpin2, Julia A. Metcalf2, Irini Sereti2, Michael A. Polis2, Richard T. Davey2, Jorge Tavel2, Judith Falloon2, Randy Stevens5, Laurie Lambert5, Robin Dewar5, Douglas J. Schwartzentruber4, Miriam R. Anver5, Michael W. Baseler5, Henry Masur1, Dimiter S. Dimitrov3 and H. Clifford Lane2

1 Critical Care Medicine Department, Clinical Center
2 Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases
3 Laboratory of Experimental and Computational Biology, DBS, National Cancer Institute-Frederick
4 Surgery Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892
5 Science Applications International Corporation, Frederick, MD 21702

Address correspondence to Joseph A. Kovacs, Building 10, Rm. 7D43, MSC 1662, Bethesda, MD 20892-1662. Phone: 301-496-9907; Fax: 301-402-1213; E-mail: jkovacs{at}nih.gov

We examined the effects of human immunodeficiency virus infection on the turnover of CD4 and CD8 T lymphocytes in 17 HIV-infected patients by 30 min in vivo pulse labeling with bromodeoxyuridine (BrdU). The percentage of labeled CD4 and CD8 T lymphocytes was initially higher in lymph nodes than in blood. Labeled cells equilibrated between the two compartments within 24 h. Based on mathematical modeling of the dynamics of BrdU-labeled cells in the blood, we identified rapidly and slowly proliferating subpopulations of CD4 and CD8 T lymphocytes. The percentage, but not the decay rate, of labeled CD4 or CD8 cells in the rapidly proliferating pool correlated significantly with plasma HIV RNA levels for both CD4 (r = 0.77, P < 0.001) and CD8 (r = 0.81, P < 0.001) T cells. In six patients there was a geometric mean decrease of greater than 2 logs in HIV levels within 2 to 6 mo after the initiation of highly active antiretroviral therapy; this was associated with a significant decrease in the percentage (but not the decay rate) of labeled cells in the rapidly proliferating pool for both CD4 (P = 0.03) and CD8 (P < 0.001) T lymphocytes. Neither plasma viral levels nor therapy had an effect on the decay rate constants or the percentage of labeled cells in the slowly proliferating pool. Monocyte production was inversely related to viral load (r = -0.56, P = 0.003) and increased with therapy (P = 0.01). These findings demonstrate that HIV does not impair CD4 T cell production but does increase CD4 and CD8 lymphocyte proliferation and death by inducing entry into a rapidly proliferating subpopulation of cells.

Key Words: AIDS • bromodeoxyuridine • CD4 T lymphocyte proliferation • CD8 T lymphocyte proliferation • highly active antiretroviral therapy


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