Pre- and Post-treatment Lung Microbiota, Metabolome and Immune Signatures at the Site of Disease in Patients With Active Pulmonary Tuberculosis

Overview

The diverse microbial communities in different parts of the human body (microbiome) are important for health but understudied in pulmonary tuberculosis (TB), which is the single biggest infectious cause of death in the world. The investigators will study the site-of-disease microbiome (in the lung bronchoalveolar space) in TB cases to investigate how, before TB treatment, metabolic compounds made by microbes affect host biomarkers important for TB control. The investigators will ask this question again at the end-of-treatment and one year later. Specifically, the investigators will sample the lung at the active TB hotspot identified by imaging and compare this to a non-involved lung segment usually in the opposite lung. The investigators will compare the lung microbiome to other sites in the body (i.e. oral cavity, nasopharynx, supraglottis, and gut). A small amount of blood (\~15 ml) will be collected to assess peripheral immunological correlates of the host microbiome. Protected specimen brushings of the lung will be used to explore transcriptomic signatures and how these relate to the lung microbiome. The investigators will also apply these questions to the same number of controls (healthy patients and patients with an alternative diagnoses). This will lay the foundation for clinical trials to evaluate if specific bacteria have diagnostic (e.g., PCR) or therapeutic potential (e.g., antibiotics, prebiotics, probiotics, vaccines) where targeting the microbiome could improve clinical outcomes.

The human body is host to complex microbial communities at different anatomical sites such as the gut, oral cavity, vagina, skin, and the lower respiratory tract - a site previously thought to be sterile. Growing evidence has implicated the role of the human microbiome in various diseases for example, Prevotella-enriched lung communities in HIV-positive pneumonia patients independently predict 70-day mortality, and Lactobacillus enriched murine gut microbiome alleviates asthma-like symptoms. However, despite the scale and severity of TB, there are limited studies on the microbiome in TB cases, the site of disease, and the effect of treatment, especially in the context of HIV. These key knowledge gaps preclude the design and evaluation of interventions that could target the microbiome and avert poor treatment outcomes in TB. To date the few microbiome studies in TB have focused on the upper respiratory tract (using specimens such as sputum) and gut rather than the site of disease which, in TB, is typically the lung. These studies have shown associations between the microbiome and state of disease. For example, mice colonized with Helicobacter hepaticus in the gut demonstrate poor control of mycobacterial growth, heightened inflammation, and severe tissue pathology in the lungs. The lung which is the site of disease in pulmonary TB has been widely considered sterile until recently and the lung microbiome remains widely understudied in TB regardless of the potential impact it might have in TB pathogenesis. One of the major reasons why the lung is understudied is the difficult in sampling the lung. The investigators will implement a modified bronchoscopy procedure to avoid microbial cross-contamination from neighbouring anatomical sites (including from diseased to healthy parts of the lungs) and to accurately sample the low biomass in the bronchoalveolar space. The investigators hypothesize that TB cases have a distinct site-of-disease lung microbiota compared to non-diseased contralateral tissue, characterized by an enrichment of oral anaerobic fermenters, SCFAs, and impaired inflammation and tissue repair biomarkers. They also expect microbial and host biomarkers to be altered by TB treatment. A study by one of the investigators has already demonstrated lung microbiomes enriched with anaerobic oral taxa are associated with lung inflammation of the Th17 phenotype. The products of microbial anaerobic metabolism have also been shown to modulate immune response to diseases. The investigators will correlate the complex microbial communities at the site-of-disease in TB with the microbial and host biomarkers at the site-of-disease. The study will recruit self-reporting patients with their first TB episode and Xpert MTB/RIF Ultra-confirmed TB from Scottsdene and Wallacedene primary care clinics in Cape Town. A total of 50 TB cases equally stratified by HIV status and 50 healthy household contacts (HHC) also stratified by HIV will be recruited. In addition to HIV-negatives, the study is recruiting an equal number of ART-treated HIV-positive TB cases, because there an epidemiologically important subpopulation with impaired pulmonary immunity. An additional 50 sick controls with other pulmonary diseases (Asthma, Chronic obstructive pulmonary disease (COPD), Cancer, Bronchiectasis (including post-TB) and Pneumonia) will recruited as comparator groups.