A CD3+CD8+ T Cell Population Lacking CD5 Antigen Expression Is Expanded in Peripheral Blood of Human Immunodeficiency Virus-Infected Patients

Stefano Indraccolo, Marta Mion, Rita Zamarchi, Vincenzo Coppola, Francesca Calderazzo, Alberto Amadori, Luigi Chieco-Bianchi

Research output: Contribution to journalArticle

Abstract

In this study we analyzed the behavior of a CD3+ T cell subpopulation lacking CD5 antigen expression in PBMC from HIV-1-infected patients. CD3+CD5- lymphocytes were greatly increased in peripheral blood of HIV-1+ patients, accounting for 20.6 ± 9.9% of the total CD3+ cells, compared to seronegative individuals (5.5 ± 3.2%). In both seropositive patients and controls, CD3+CD5- cells belonged to the CD8+ compartment; they were nonactivated, TCR α/β+, naive lymphocytes, and in seronegative individuals preferentially expressed NK cell-associated markers, such as CD11b, CD16, CD56, and CD57. The phenotypic profile of this subset was slightly different in seropositive patients; while TCR expression and CD45RA/RO profile were comparable, CD11b and CD16 expression was lower compared to control figures, while CD56 expression was not changed, and CD57 expression was enhanced. Functional analysis of enriched CD3+CD8+CD5- cells showed an impaired ability to proliferate in response to mitogenic and antigenic stimuli; despite their NKlike phenotype, CD3+CD8+CD5- cells did not exert any NK cytotoxic activity, and only a lectin-dependent cytotoxic potential could be evidenced in this population. These results describe a novel alteration in the lymphocyte phenotypic profile during HIV-1 infection, involving a "transitional" population, which shares some properties of the T and of the NK cell lineage.

Original languageEnglish
Pages (from-to)253-261
Number of pages9
JournalClinical Immunology and Immunopathology
Volume77
Issue number3
DOIs
Publication statusPublished - Dec 1995

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ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Immunology and Allergy
  • Immunology

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