CD4+ T cell response to Leishmania spp. in non-infected individuals

Claudia Raja Gabaglia, M. T. Valle, D. Fenoglio, M. A. Barcinski, F. Manca

Research output: Contribution to journalArticlepeer-review


T cell mediated immunity is known to play a central role in the host response to control intracellular pathogens. This work demonstrates the presence of specific CD4+ T cells-to Leishmania spp. antigens in peripheral mononuclear cells of naive individuals (normal volunteers from non-endemic regions). The responder population was expanded by generation of antigen- specific T cell lines, which were produced by repeated stimulation with fixed promastigotes and autologous irradiated PBMC as antigen presenting cells. The leishmania-T cell lines were shown to proliferate in response to different species of the parasite (L. amazonensis, L. braziliensis, and L. donovani), but not to other recall antigens such as Candida albicans or tetanus toxoid. A preferential expansion of IFNγ and IL-2 producing Th1-like T cells was observed. The leishmania-reactive cells were distributed between CD4+ CD45RA+ ('naive') and CD4+ CD45R0+ ('memory') populations. Although limiting dilution analysis showed a precursor frequency 3 times lower within the naive compartment, similar numbers of T cell lines were derived from both purified subpopulations. This study using leishmania-specific CD4+ T cell lines produced from normal individuals should provide information on cellular immune responses that are triggered by the parasite and how infection impacts the naive T cell repertoire. (C) American Society for Histocompatibility and Immunogenetics, 2000.

Original languageEnglish
Pages (from-to)531-537
Number of pages7
JournalHuman Immunology
Issue number6
Publication statusPublished - Jun 2000


  • CD4 T cell lines
  • Cytokines
  • Leishmania sp.
  • Memory T cells
  • Non-infected individuals

ASJC Scopus subject areas

  • Immunology
  • Immunology and Allergy


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