Frequency and phenotype of B cell subpopulations in young and aged HIV-1 infected patients receiving ART

Sylvie Amu, Gitit Lavy-Shahaf, Alberto Cagigi, Bo Hejdeman, Silvia Nozza, Lucia Lopalco, Ramit Mehr, Francesca Chiodi

Research output: Contribution to journalArticle

Abstract

Background: Aged individuals respond poorly to vaccination and have a higher risk of contracting infections in comparison to younger individuals; whether age impacts on the composition and function of B cell subpopulations relevant for immune responses is still controversial. It is also not known whether increased age during HIV-1 infection further synergizes with the virus to alter B cell subpopulations. In view of the increased number of HIV-1 infected patients living to high age as a result of anti-retroviral treatment this is an important issue to clarify.Results: In this work we evaluated the distribution of B cell subpopulations in young and aged healthy individuals and HIV-1 infected patients, treated and naïve to treatment. B cell populations were characterized for the expression of inhibitory molecules (PD-1 and FcRL4) and activation markers (CD25 and CD69); the capacity of B cells to respond to activation signals through up-regulation of IL-6 expression was also evaluated. Increased frequencies of activated and tissue-like memory B cells occurring during HIV-1 infection are corrected by prolonged ART therapy. Our findings also reveal that, in spite of prolonged treatment, resting memory B cells in both young and aged HIV-1 infected patients are reduced in number, and all memory B cell subsets show a low level of expression of the activation marker CD25.Conclusions: The results of our study show that resting memory B cells in ART-treated young and aged HIV-1 infected patients are reduced in number and memory B cell subsets exhibit low expression of the activation marker CD25. Aging per se in the HIV-1 infected population does not worsen impairments initiated by HIV-1 in the memory B cell populations of young individuals.

Original languageEnglish
Article number76
JournalRetrovirology
Volume11
Issue number1
DOIs
Publication statusPublished - Sep 11 2014

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Keywords

  • Aging
  • B cells
  • CD25
  • CD69
  • HIV-1
  • IL-6

ASJC Scopus subject areas

  • Virology
  • Infectious Diseases

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