Mycobacterial antigen driven activation of CD14++ CD16-monocytes is a predictor of tuberculosis-associated immune reconstitution inflammatory syndrome
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2014
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PLoS One
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Public Library of Science
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University of Cape Town
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Abstract
Paradoxical tuberculosis-associated immune reconstitution inflammatory syndrome (TB-IRIS) is an aberrant inflammatory response occurring in a subset of TB-HIV co-infected patients initiating anti-retroviral therapy (ART). Here, we examined monocyte activation by prospectively quantitating pro-inflammatory plasma markers and monocyte subsets in TB-HIV co-infected patients from a South Indian cohort at baseline and following ART initiation at the time of IRIS, or at equivalent time points in non-IRIS controls. Pro-inflammatory biomarkers of innate and myeloid cell activation were increased in plasma of IRIS patients pre-ART and at the time of IRIS; this association was confirmed in a second cohort in South Africa. Increased expression of these markers correlated with elevated antigen load as measured by higher sputum culture grade and shorter duration of anti-TB therapy. Phenotypic analysis revealed the frequency of CD14++CD16− monocytes was an independent predictor of TB-IRIS, and was closely associated with plasma levels of CRP, TNF, IL-6 and tissue factor during IRIS. In addition, production of inflammatory cytokines by monocytes was higher in IRIS patients compared to controls pre-ART. These data point to a major role of mycobacterial antigen load and myeloid cell hyperactivation in the pathogenesis of TB-IRIS, and implicate monocytes and monocyte-derived cytokines as potential targets for TB-IRIS prevention or treatment.
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Andrade, B. B., Singh, A., Narendran, G., Schechter, M. E., Nayak, K., Subramanian, S., ... & Wilkinson, K. A. (2014). Mycobacterial antigen driven activation of CD14++ CD16-monocytes is a predictor of tuberculosis-associated immune reconstitution inflammatory syndrome. PLoS Pathog, 10(10), e1004433. doi:10.1371/journal.ppat.1004433