Design of immunogenic peptides from Mycobacterium tuberculosis genes expressed during macrophage infection

Fouad Seghrouchni, Silvia Contini, Roumiana Markova, Roumiana Drenska, Khalid Sadki, Larbii Baassi, Yana Todorova, Velislava Terzieva, Marialuisa Bocchino, Giulia Cappelli, Alfonso Maria Altieri, Mario Giuseppe Alma, Abdelaziz Benjouad, Francesca Mariani, Bogdan Petrunov, Vittorio Colizzi, Rajae El Aouad, Cesare Saltini, Massimo Amicosante

Research output: Contribution to journalArticlepeer-review

Abstract

In vitro diagnosis of MTB-infection uses MTB-proteins coded for by genes of the region of differentiation 1 (RD1) of the MTB genome. This study wants to test if proteins preferentially expressed during MTB-intracellular growth might provide new targets for the diagnosis of MTB-infection. To this end seventy-five multiepitopic HLA-promiscuous MTB-peptides were designed by quantitative implemented peptide-binding motif analysis from 3 MTB-protein genes expressed in activated human macrophages (MA), 4 genes expressed during growth in non-activated human macrophages (MN-A), 12 housekeeping genes (HKG) and 6 genes of the RD1 region (RD1) as control. ELISpot for IFN-was performed to measure the responses of PBMCs deriving from 45 patients affected by active tuberculosis and 34 controls. In active-TB patients, the mean response to RD1-derived peptides was higher than that to either MA (p <0.01), MN-A (p <0.008) or HKG (p <0.01) derived peptides. In TST-positive subjects all selected peptides elicited significant IFN-T-cell responses (p <0.02 compared to TST-negatives), but without differences between the subgroups. Further, T-cell responses to RD1 peptides were lower in the 23 active-TB treated patients than in the untreated ones (p <0.01). The response to MA peptides in treated active-TB was higher than when untreated (p <0.01). These results demonstrate that the use of in vitro models of MTB-intracellular infection to select MTB gene products for further in silico and in vitro assessment of their immunogenicity have the potential to identify novel antigens amenable to the design of new tools for diagnosis and monitoring of tuberculosis.

Original languageEnglish
Pages (from-to)210-217
Number of pages8
JournalTuberculosis
Volume89
Issue number3
DOIs
Publication statusPublished - May 2009

Keywords

  • ELISpot
  • Macrophage-induced mycobacterial genes
  • Peptide-binding motifs
  • Tuberculosis

ASJC Scopus subject areas

  • Microbiology
  • Immunology
  • Infectious Diseases
  • Microbiology (medical)

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