Expansion of CD11abright cells in CD8+CD45RA+ from HIV-infected patients: a new early marker for disease progression?

AIDS Res Hum Retroviruses. 1995 Nov;11(11):1327-33. doi: 10.1089/aid.1995.11.1327.


CD8+CD45RA+ T lymphocytes present two distinct subpopulations expressing the CD11a molecule (LFA-1 alpha chain) with different intensity. CD11adim cells represent the unprimed population within the CD8+CD45RA+ subset, whereas CD11abright cells are activated and may be considered as memory lymphocytes. The aim of this study was to analyze the expression of CD11a and CD18 within the CD8+CD45RA+ population in young HIV-infected individuals at different stages of disease as a marker of activation and of disease progression. Blood cells from 82 HIV-infected individuals and 23 age-matched healthy controls were stained with unconjugated CD11a, CD18, PE-goat F(ab')2 anti-mouse, FITC-CD45RA, and TRI-Color CD8. Quantitative analysis for three-color immunofluorescence was carried out by flow cytometry. HIV+ subjects were subdivided into three groups according to their CD4+ cell number (group A, CD4+ cells > 500/microliters [20 subjects], group B, CD4+ cells between 500 and 200/microliters [36 subjects], and group C, CD4+ lymphocytes < 200/microliters [26 subjects]). We found a significant increase of CD11abright in the CD8+CD45RA+ subpopulation throughout the progression of the disease. The CD11abright percentage of positivity (mean) within the CD8+CD45RA+ subpopulation was 31% in healthy donors, 51% in group A, 52% in group B, and 68% in group C. CD11abright expression was closely related to CD18bright (p < 0.001), but not to CD38. The relative increase of CD11a and CD18 expression in CD8+CD45RA+ T lymphocytes parallels the decrease of CD4+ cells and the progression of disease: an inverse correlation between the percentages of CD4+ cells/microliter and CD8+CD45RA+CD11abright cells (p < 0.001) and a direct correlation between the number of CD4+ lymphocytes per microliter and both the number of CD8+CD45RA+CD11adim cells (p < 0.001) and the number of CD8+CD45RA+CD11abright (p = 0.002) was observed. The relative increase of CD8+CD45RA+CD11abright cells may represent an additional marker for monitoring HIV-induced immunodeficiency.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Biomarkers
  • CD11 Antigens / metabolism*
  • CD18 Antigens / metabolism*
  • CD4-CD8 Ratio
  • CD8-Positive T-Lymphocytes / immunology*
  • Disease Progression
  • Female
  • HIV Infections / blood
  • HIV Infections / immunology*
  • Humans
  • Leukocyte Common Antigens / immunology*
  • Lymphocyte Activation
  • Male
  • Middle Aged


  • Biomarkers
  • CD11 Antigens
  • CD18 Antigens
  • Leukocyte Common Antigens