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High Turnover of Tissue Macrophages Contributes to Tuberculosis Reactivation in Simian Immunodeficiency Virus-Infected Rhesus Macaques
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High Turnover of Tissue Macrophages Contributes to Tuberculosis Reactivation in Simian Immunodeficiency Virus-Infected Rhesus Macaques
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Journal Article
High Turnover of Tissue Macrophages Contributes to Tuberculosis Reactivation in Simian Immunodeficiency Virus-Infected Rhesus Macaques
2018
Overview
Tuberculosis (TB) and human immunodeficiency virus (HIV)/acquired immune deficiency syndrome (AIDS) profoundly affect the immune system and synergistically accelerate disease progression. It is believed that CD4+ T-cell depletion by HIV is the major cause of immunodeficiency and reactivation of latent TB. Previous studies demonstrated that blood monocyte turnover concurrent with tissue macrophage death from virus infection better predicted AIDS onset than CD4+ T-cell depletion in macaques infected with simian immunodeficiency virus (SIV).
In this study, we describe the contribution of macrophages to the pathogenesis of Mycobacterium tuberculosis (Mtb)/SIV coinfection in a rhesus macaque model using in vivo BrdU labeling, immunostaining, flow cytometry, and confocal microscopy.
We found that increased monocyte and macrophage turnover and levels of SIV-infected lung macrophages correlated with TB reactivation. All Mtb/SIV-coinfected monkeys exhibited declines in CD4+ T cells regardless of reactivation or latency outcomes, negating lower CD4+ T-cell levels as a primary cause of Mtb reactivation.
Results suggest that SIV-related damage to macrophages contributes to Mtb reactivation during coinfection. This also supports strategies to target lung macrophages for the treatment of TB.
Publisher
Oxford University Press
Subject
/ CD4-Positive T-Lymphocytes - immunology
/ CD4-Positive T-Lymphocytes - microbiology
/ CD4-Positive T-Lymphocytes - virology
/ Latent Tuberculosis - immunology
/ Latent Tuberculosis - microbiology
/ Latent Tuberculosis - virology
/ Lymphocyte Depletion - methods
/ Macrophages, Alveolar - immunology
/ Macrophages, Alveolar - microbiology
/ Macrophages, Alveolar - virology
/ Male
/ Mycobacterium tuberculosis - immunology
/ Simian Acquired Immunodeficiency Syndrome - immunology
/ Simian Acquired Immunodeficiency Syndrome - microbiology
/ Simian Acquired Immunodeficiency Syndrome - virology
