Increased frequency of circulating Tc22/Th22 cells and polyfunctional CD38 T cells in HIV-exposed uninfected subjects

LMS Oliveira, JF Lima, CAC Cervantes, J S. Casseb… - Scientific reports, 2015 - nature.com
LMS Oliveira, JF Lima, CAC Cervantes, J S. Casseb, M Mendonça, AJS Duarte, MN Sato
Scientific reports, 2015nature.com
Some individuals are resistant to HIV-1 infection despite repeated exposure to the virus,
suggesting the presence of a complex antiviral response. Innate factors like IL-22 exert gut
mucosal protection and polyfunctional T cells have been associated with low progression in
HIV infection; therefore, we evaluated the frequencies of CD4+ and CD8+ T cell-secreting
cytokines, including Tc22/Th22 cells and polyfunctional T cells in HIV-1-exposed uninfected
individuals (EUs), their HIV-1-infected partners and healthy controls. EUs exhibited an …
Abstract
Some individuals are resistant to HIV-1 infection despite repeated exposure to the virus, suggesting the presence of a complex antiviral response. Innate factors like IL-22 exert gut mucosal protection and polyfunctional T cells have been associated with low progression in HIV infection; therefore, we evaluated the frequencies of CD4+ and CD8+ T cell-secreting cytokines, including Tc22/Th22 cells and polyfunctional T cells in HIV-1-exposed uninfected individuals (EUs), their HIV-1-infected partners and healthy controls. EUs exhibited an increased frequency of p15 Gag CD4+ IL-22+ secreting T cells, whereas HIV-infected partners demonstrated a high frequency of CD4+ IL-17+ T cells in response to p24. Similar responses of Th22 and Tc22 cells to Gag peptides and Staphylococcal enterotoxin B (SEB) stimulation were detected in the serodiscordant couples. However, polyfunctionality in HIV subjects was associated with an HIV Gag response of CD38+ T cells, whereas polyfunctionality for EUs was induced upon SEB stimulation by CD38- T cells. EUs demonstrated the presence of Tc22/Th22 cells and polyfunctional CD38- T cells with a low activation profile. These data suggest that SEB-induced polyfunctional CD4+ and CD8+ T cells together with Tc22/Th22 cells in EU individuals can provide an immunological advantage in the response to pathogens such as HIV-1.
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