Gut commensal microbes do not represent a dominant antigenic source for continuous CD4+ T-cell activation during HIV-1 infection

European Journal of Immunology
Kathrin ZimmermannAnnette Oxenius

Abstract

Chronic immune activation is a hallmark of HIV-1 infection; specifically, the activation of T cells has predictive value for progression to AIDS. The majority of hyperactivated T cells are not HIV-specific and their antigenic specificities remain poorly understood. Translocation of gut luminal microbial products to systemic sites contributes to chronic immune activation during HIV-1 infection, but how it affects (TCR-dependent) immune activation remains elusive. We hypothesized that gut luminal antigens foster activation of CD4(+) T cells with specificities for commensal bacterial antigens, thereby contributing to the pool of activated CD4(+) T cells in the circulation of HIV-1 infected individuals. To test this hypothesis, we quantified the frequencies of gut microbe-specific CD4(+) T cells by cytokine production upon restimulation with selected gut commensal microbial antigens. Contrary to our hypothesis, we did not observe increased but rather decreased frequencies of gut microbe-specific CD4(+) T cells in HIV-1 infected individuals compared to healthy controls. We conclude that the increased activation status of circulating CD4(+) T cells in HIV-1 infected individuals is not driven by CD4(+) T cells with specificities for c...Continue Reading

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Citations

Jan 15, 2016·The Journal of Immunology : Official Journal of the American Association of Immunologists·Anjali JoshiHimanshu Garg

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