Lung HIV Microbiome Project (Michigan Site)

University of Michigan59 enrolled

Overview

In its original phase, this cohort study recruited subjects who were either HIV-positive or HIV-negative healthy controls, to analyze the community structure of the lung microbiome. Original recruitment was planned to occur both at the University of Michigan Medical Center and clinics, and at VA Ann Arbor Healthcare System. Enrollment for the original cohort is completed, and all current activity of this project is occurring at VA Ann Arbor, where both Veteran subjects and non-Veteran subjects are eligible to participate. This study is currently recruiting only healthy HIV-negative subjects. Participation, described below, involves a research bronchoscopy procedure.

This is a non-interventional cohort study with single time point cross-sectional comparisons and longitudinal analyses, with the primary study aims of: evaluating how the immune deficiency associated with HIV infection influences the lung microbiome and lung function, and evaluating changes in lung microbiota over time. The study also aims to characterize the microbiome of the lower respiratory tract, determine the relationship between the lower respiratory Microbiome and the upper respiratory and gastrointestinal tract microbiomes, evaluate the influence of smoking on the microbiome compared with the influence of smoking on pulmonary function and respiratory systems, and to evaluate how Pneumocystis infection influences HIV-infected and HIV-uninfected individuals.

Study Type

OBSERVATIONAL

Enrollment

Conditions

Healthy Participants Tobacco Use Disorder Human Microbiome

Eligibility

Sex: ALLMin age: 18 YearsMax age: 80 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: * Negative HIV testing (by ELISA) during initial study visit * No signs of respiratory infection at enrollment, such as: fever; recent change in quantity of quality of sputum; chest pain; recent change in shortness of breath or exertional activity * Willing and able to sign the informed consent document * If female of child-bearing potential, negative pregnancy test during initial study visit Exclusion Criteria: * Pregnancy * Signs or symptoms of respiratory infection at enrollment * Unwilling or unable to sign the informed consent document * Unstable heart disease * Other systemic disease and unlikely to survive at least 2 years * Mental incompetence * Participation in another interventional protocol within the last 6 weeks * Use of antibiotics for a lung infection within the last 4 weeks * Renal Failure (creatinine \>3) * Child's Class C Cirrhosis

Outcomes

Primary Outcomes

Lung bacterial microbiome community structure

biological samples will be analyzed by culture-independent microbiological and bioinformatic techniques to determine the constituent members of the bacterial microbiome at each sampled site, to the level of "operational taxonomic unit" at 97% similarity to published sequences.

Time frame: at time of bronchoscopy