The Significance of Discordant Serology in Chagas Disease: Enhanced T-Cell Immunity to Trypanosoma cruzi in Serodiscordant Subjects.

Abstract:

BACKGROUND:Subjects are considered infected with Trypanosoma cruzi when tested positive by at least two out of three serological tests, whereas a positive result in only one of up to three tests is termed "serodiscordant" (SD). Assessment of parasite-specific T-cell responses may help discriminate the uninfected from infected individuals among SD subjects. METHODS:Peripheral blood mononuclear cells from SD and seropositive (SP) subjects, who were born in areas endemic for T. cruzi infection but living in Buenos Aires city, Argentina, at the time of the study, and seronegative unexposed subjects were included for analysis. The function and phenotype of T cells were assessed by interferon-γ (IFN-γ) and interleukin (IL)-2 enzyme-linked immunospot assay and multiparameter flow cytometry. T. cruzi-specific antibodies were quantified by conventional serology and a multiplex assay format. RESULTS:SD subjects exhibited immunity cell responses to T. cruzi but in contrast to SP subjects, T cells in SD subjects more often display the simultaneous production of IFN-γ and IL-2 in response to T. cruzi antigens and have a resting phenotype. SD individuals also have higher IFN-γ spot counts, polyfunctional CD4+ T-cells enriched in IL-2 secreting cells and low levels of antibodies specific for a set of T. cruzi-derived recombinant proteins compared with the SP group. Long-term follow-up of SD individuals confirmed that humoral and T-cell responses fluctuate but are sustained over time in these subjects. T cells in SD subjects for T. cruzi infection did not recognize Leishmania antigens. CONCLUSION:Both T-cell and humoral responses in most subjects assessed by conventional tests as SD for T. cruzi infection indicate prior exposure to infection and the establishment of immunological memory suggestive of a resolved infection.

journal_name

Front Immunol

journal_title

Frontiers in immunology

authors

Castro Eiro MD,Alvarez MG,Cooley G,Viotti RJ,Bertocchi GL,Lococo B,Albareda MC,De Rissio AM,Natale MA,Parodi C,Tarleton RL,Laucella SA

doi

10.3389/fimmu.2017.01141

subject

Has Abstract

pub_date

2017-09-15 00:00:00

pages

1141

issn

1664-3224

journal_volume

8

pub_type

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