Explosion of tuberculin-specific Th1-responses induces immune restoration syndrome in tuberculosis and HIV co-infected patients

AIDS
Anne BourgaritBrigitte Autran

Abstract

To test the hypothesis that an acute exacerbation of mycobacteria-specific Th1 response after HIV infection control by HAART causes immune restoration syndrome (IRS) in HIV-tuberculosis (TB) coinfected patients. Prospective, multicenter study of 19 consecutive untreated HIV-TB coinfected patients included when initiating antimycobacterial therapy and sequentially evaluated during HAART and at time of IRS. IRS was defined according to classical clinical diagnostic criteria. Patients were declared IRS- if no IRS occurred within 3 months after HAART initiation. Mycobacteria-specific [purified protein derivative (PPD), ESAT-6, 85B] Th1 cells producing interferon (IFN)-gamma quantified by ELISpot, in vitro production of 25 cytokines/chemokines in antigen-stimulated peripheral blood mononuclear cell (PBMC) supernatants quantified by chemiluminescence. Seven patients (37%) experienced IRS (IRS+). Mycobacteria-specific (PPD) Th1 IFN-gamma-producing cells increased sharply during IRS (median, 2970 spot forming cells/10 PBMC), but not the cytomegalovirus-specific responses tested as control. Only three IRS+ patients had low ESAT-6- but no 85B-specific responses. IRS- patients did not develop acute PPD-specific responses except in one cas...Continue Reading

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