Increased activation and expansion of a CD57+ subset within peripheral CD8+ T lymphocytes in mycobacterium tuberculosis-infected patients

Farah Dokht Fateminasab, Shapour Shahgasempour, Seyed Mehdi Mirsaeidi, Payam Tabarsi, Seyed Davood Mansoori, Zinat Entezami

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Background: Mycobacterium tuberculosis-specific CD8+ and CD4+ T lymphocyte responses restrict the spread of extracellular pathogens by limiting M. tuberculosis replication. Alterations in cytolytic function, inappropriate maturation/differentiation, and limited proliferation could reduce their ability to control M. tuberculosis replication. Methods: In an attempt to further characterize the immune responses during M.tuberculosis infection, we enumerated γδ and αβ receptor-bearing T cells expressing CD8 or CD4 phenotype and analyzed the differentiation phenotypes of CD8+ and CD4+ T lymphocyte subpopulations in 47 cases (23 new cases and 24 multidrug resistant patients) and 20 control subjects, using flowcytometry. Results: We found that the CD4/CD8 ratio was significantly lower in newly-diagnosed M.tuberculosis patients compared to multidrug resistant and control subjects (P < 0.003). Also, we found that a large proportion of CD8+ T lymphocytes in newly-diagnosed patients was defined by increased surface expression of CD57 as compared to the two other settings (P < 0.002). This increase was more profound in patients with an inverted CD4/CD8 ratio. Analysis of the late activation antigen revealed that this was predominantly HLA-DR+ (P < 0.003). No significant changes were observed in the percentages of CDB+CD57+ T cells between the different settings. Moreover, the co-stimulatory molecule CD28+ tended to be underexpressed by CD8+ T cells in multidrug resistant patients when compared to newly-diagnosed subjects (P < 0.002), but not to the control subjects. In contrast, the frequency of CD28+ marker on CD4+ T cells was higher in the setting of multidrug resistant compared with those of new cases (P < 0.0001). No significant changes were observed in percentages of γδ receptor-bearing T cells between different groups. Conclusion: We suggest that the increase in the proportion of CD57+ within CD8+ T cells in newly-diagnosed patients results from M.tuberculosis antigenic stimulation, which is a hallmark of many infections and that the protracted accumulation of CD57+ T lymphocytes might reflect an end-stage differentiation phenotype.

Original languageEnglish (US)
Pages (from-to)53-57
Number of pages5
JournalArchives of Iranian Medicine
Volume9
Issue number1
StatePublished - Jan 1 2006
Externally publishedYes

Keywords

  • CD4+CD28+ T cell
  • CD8+CD57+ T cell
  • Mycobacterium tuberculosis

ASJC Scopus subject areas

  • Medicine(all)

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