Defective clonogenic potential of CD8+ T lymphocytes in patients with AIDS. Expansion in vivo of a nonclonogenic CD3+CD8+DR+CD25- T cell population


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Defective clonogenic potential of CD8+ T lymphocytes in patients with AIDS. Expansion in vivo of a nonclonogenic CD3+CD8+DR+CD25- T cell population
Journal of Immunology
Pantaleo  G., Koenig  S., Baseler  M., Lane  H. C., Fauci  A. S.
0022-1767 (Print)
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Research Support, U.S. Gov't, P.H.S. --- Old month value: Mar 1
This study examines the potential mechanism(s) responsible for the defective clonability of CD8+ T lymphocytes in patients with AIDS. By the combined use of one- and two-color fluorescence cytofluorometry we have shown an increase in the number of circulating DR+ cells due to the expression of DR on a relatively large proportion of T lymphocytes (one-third of CD3+ cells), the majority of them belonging to the CD8+ subset. In addition, the majority of CD8+DR+ cells in AIDS patients did not express CD25 Ag (the receptor for IL-2), a surface marker generally expressed on normal activated T lymphocytes. Sorted CD8+DR+ and CD8+DR- cell populations were analyzed comparatively for their ability to proliferate in response to different stimuli, including anti-CD3, anti-CD2, alone or in combination with anti-CD28 mAb and mitogens such as PHA, alone or in combination with PMA. We have demonstrated that CD8+DR+ cells were severely defective in their proliferative response to triggering via these major pathways of T cell activation even when an exogenous source of IL-2 or IL-4 was added to the microcultures 24 h after initiating the cultures. In contrast, CD8+DR- cells showed a significant proliferation in response to the different stimuli and the proliferative response was strongly enhanced by the addition of IL-2 or IL-4. At the end of the stimulation period CD8+DR+ and CD8+DR- proliferating populations were analyzed for CD25 Ag expression. Only 1 to 10% of CD8+DR+ cells expressed CD25 antigen compared with 40 to 50% of CD8+DR- cells. The proliferative defect of CD8+DR+ cells was further confirmed in experiments performed at the clonal level. The analysis of the frequency of proliferating T lymphocyte-precursors in both CD8+DR+ and CD8+DR- subsets showed that the defective clonogenic potential of CD8+ cells in AIDS patients could be in large part ascribed to CD8+DR+ cells. Five percent of CD8+DR+ cells showed a clonogenic potential compared to the 25% of CD8+DR- cells. Finally, we analyzed the surface expression of VLA-2 Ag, a marker of a chronic state of T cell activation, on circulating T lymphocytes. We have shown that a large proportion of CD3+DR+CD25- cells (50 to 80% in the different patients with AIDS analyzed) expressed VLA-2 Ag.(ABSTRACT TRUNCATED AT 400 WORDS)
Acquired Immunodeficiency Syndrome/*immunology Antigens, CD/*analysis Antigens, CD3 Antigens, CD8 Antigens, Differentiation, T-Lymphocyte/analysis Antigens, Surface/analysis Cell Division Cells, Cultured Flow Cytometry HIV Seropositivity/immunology HLA-DR Antigens/analysis Humans Lymphocyte Activation Receptors, Antigen, T-Cell/analysis Receptors, Interleukin-2/analysis Receptors, Very Late Antigen/analysis T-Lymphocytes/cytology/*immunology
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25/01/2008 15:14
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20/08/2019 15:23
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