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.

Detailed description

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.

Primary outcome measures

• Characterization of changes in microbiota in diseased vs. non-diseased lung segments, stratified by HIV status. [Time frame: Up to 18 months]
• Association of specific microbial taxa in diseased segments with elevated SCFAs and impaired host inflammation and tissue repair biomarkers. [Time frame: Up to 18 months]
• Evaluate the impact of treatment on the lung microbiome. [Time frame: Up to 18 months]

Eligibility criteria

Inclusion criteria

• 18-60 years old.
• Agree to undergo CXR and/or CT scan.
• Has unilateral TB disease defined as one lung with extensive evidence of TB disease (non-applicable to healthy controls; sick controls will require an alternative diagnosis).
• No evidence of prior TB treatment and/or CXR/CT does not have obvious evidence of prior TB.
• Willing to undergo a research bronchoscopy at baseline, 6 months and 18 months and likely to remain in the area for the study period.
• If HIV-positive, must be stable on antiretroviral therapy (ART) for ≥1 year.
• Able and willing to return for follow-up visits, with no plans to move in the near future.
• Willing to comply with study requirements i.e. provision of contact details and written, informed consent prior to enrolment.

Exclusion criteria

• Less than 18 years or older than 60 years of age.
• Has already initiated TB treatment.
• Rifampicin resistant.
• Has a previous history of TB.
• Bilateral TB disease defined as both lungs with extensive TB disease
• Has received probiotics, antibiotics or inhaled steroids within three months prior to enrolment (not applicable to sick controls)
• Has diabetes mellitus, which affects TB disease, treatment response, and the microbiome
• Has a contraindication for bronchoscopy (e.g., FEV1 <70%), as determined by bronchoscopists according to best practice guidelines
• Has a daily alcohol intake of more than 6 beers or 4 mixed drinks
• Is pregnant (a commercial human chorionic gonadotropin determination assay will be performed in accordance with manufacturer's guidance on urine) or pregnancy planned for follow-up period
• Recent hospitalization for any reason

Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.

Healthy volunteers: Yes

Study design

Observational model

Cohort

Study locations

South Africa · 3 centers

• Kraaifontein Community Health Centre — Cape Town
• Scottsdene Clinic — Cape Town
• Wallacedene Clinic — Cape Town

Publications

• Yatsunenko T, Rey FE, Manary MJ, Trehan I, Dominguez-Bello MG, Contreras M, Magris M, Hidalgo G, Baldassano RN, Anokhin AP, Heath AC, Warner B, Reeder J, Kuczynski J, Caporaso JG, Lozupone CA, Lauber C, Clemente JC, Knights D, Knight R, Gordon JI. Human gut microbiome viewed across age and geography. Nature. 2012 May 9;486(7402):222-7. doi: 10.1038/nature11053. PMID 22699611
• Wade WG. The oral microbiome in health and disease. Pharmacol Res. 2013 Mar;69(1):137-43. doi: 10.1016/j.phrs.2012.11.006. Epub 2012 Nov 28. PMID 23201354
• Weiner J 3rd, Parida SK, Maertzdorf J, Black GF, Repsilber D, Telaar A, Mohney RP, Arndt-Sullivan C, Ganoza CA, Fae KC, Walzl G, Kaufmann SH. Biomarkers of inflammation, immunosuppression and stress with active disease are revealed by metabolomic profiling of tuberculosis patients. PLoS One. 2012;7(7):e40221. doi: 10.1371/journal.pone.0040221. Epub 2012 Jul 23. PMID 22844400
• Grice EA, Kong HH, Renaud G, Young AC; NISC Comparative Sequencing Program; Bouffard GG, Blakesley RW, Wolfsberg TG, Turner ML, Segre JA. A diversity profile of the human skin microbiota. Genome Res. 2008 Jul;18(7):1043-50. doi: 10.1101/gr.075549.107. Epub 2008 May 23. PMID 18502944
• Shenoy MK, Iwai S, Lin DL, Worodria W, Ayakaka I, Byanyima P, Kaswabuli S, Fong S, Stone S, Chang E, Davis JL, Faruqi AA, Segal MR, Huang L, Lynch SV. Immune Response and Mortality Risk Relate to Distinct Lung Microbiomes in Patients with HIV and Pneumonia. Am J Respir Crit Care Med. 2017 Jan 1;195(1):104-114. doi: 10.1164/rccm.201603-0523OC. PMID 27447987
• Wipperman MF, Fitzgerald DW, Juste MAJ, Taur Y, Namasivayam S, Sher A, Bean JM, Bucci V, Glickman MS. Antibiotic treatment for Tuberculosis induces a profound dysbiosis of the microbiome that persists long after therapy is completed. Sci Rep. 2017 Sep 7;7(1):10767. doi: 10.1038/s41598-017-10346-6. PMID 28883399
• Botero LE, Delgado-Serrano L, Cepeda ML, Bustos JR, Anzola JM, Del Portillo P, Robledo J, Zambrano MM. Respiratory tract clinical sample selection for microbiota analysis in patients with pulmonary tuberculosis. Microbiome. 2014 Aug 25;2:29. doi: 10.1186/2049-2618-2-29. eCollection 2014. PMID 25225609
• Cheung MK, Lam WY, Fung WY, Law PT, Au CH, Nong W, Kam KM, Kwan HS, Tsui SK. Sputum microbiota in tuberculosis as revealed by 16S rRNA pyrosequencing. PLoS One. 2013;8(1):e54574. doi: 10.1371/journal.pone.0054574. Epub 2013 Jan 24. PMID 23365674

Identifiers

NCT: NCT04700579 · N19/09/126

Primary sources (government registries)

• ClinicalTrials.gov (US NIH)

View this study on ClinicalTrials.gov ↗