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Effective combined antiretroviral therapy provides partial immune recovery to mycobacterial antigens in vertically infected, BCG-vaccinated youth living with HIV. | LitMetric
Background : We assessed the cytokine response by PBMC of youth living with HIV (YLHIV) under combined antiretroviral therapy (cART) to Mycobacterium tuberculosis (Mtb) and Mycobacterium bovis (BCG) antigens.Methods : PBMC from 20 Brazilian YLHIV under cART with long-term (≥1 year) virological control, and 20 healthy controls were cultured for 24-96 h under stimulation with BCG, Mtb lysates, ESAT-6 and SEB. We measured TNF-α, IFN-γ, IL-2, IL-4, IL-5, IL-10 and IL-17 in culture supernatants using a cytometric bead array.Results : Controls had higher IFN-γ production at 24, 48, 72 and 96 h upon stimulation with BCG lysate, plateauing at 48 h (Median = 1991 vs. 733 pg/mL; p = 0.01), and after 48-72 h of stimulation with Mtb lysate, plateauing at 48 h (3838 vs. 2069 pg/mL; p = 0.049). YLHIV had higher TNF-α production at all time points upon stimulation with ESAT-6, with highest concentration at 36 h (388 vs. 145 pg/mL; p = 0.02). Within the YLHIV group, total CD4 T cell count and CD4/CD8 ratio were associated with IFN-γ response to Mtb lysate and ESAT-6, respectively.Conclusions : Even under long-term cART, YLHIV seem to have a suboptimal T-helper-1 response to mycobacterial antigens. This can be explained by early immunodeficiency in vertical infection, with lasting damage.
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