Asthma, Obesity
Conditions
Brief summary
The purpose of this study is to gain understanding of mechanisms whereby bariatric surgery modulates pulmonary inflammation and pulmonary microbiome composition and how these changes direct the pathobiology of human obese asthma.
Interventions
PROCEDUREBlood draw
23 ml of blood collected
PROCEDURESputum collection
Induced sputum sample collected
PROCEDUREPulmonary function test
Pulmonary function testing
Sponsors
Duke University
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
21 Years to 60 Years
Healthy volunteers
Yes
Inclusion criteria
Asthma Subjects * Outpatient adults of either sex 21-60 years of age with an initial asthma diagnosis at \< 12 years of age (early-onset) or \>12 years of age (late-onset), as defined by the NHLBI NAEPP guidelines (17). * Subjects with obesity (BMI ≥ 30 kg/m2). * Physician diagnosis of asthma. * Eligible and scheduled for bariatric surgery (Roux-en-Y gastric bypass, sleeve gastrectomy or duodenal switch) and receiving care within the Duke Health System. FEV1 within acceptable limits (\>45% predicted before and \>55% predicted after, bronchodilator administration). * Relatively healthy subjects able to undergo sputum induction without complications. * Willing and able to give informed consent and adhere to visit/protocol schedules. * Read and write in English. Non-Asthma Control Subjects * Outpatient adults of either sex 21-60 years of age. * Subjects with obesity (BMI ≥ 30). * Eligible and scheduled for bariatric surgery (Roux-en-Y gastric bypass, sleeve gastrectomy or duodenal switch) at Duke Regional Hospital and receiving care at the Duke Metabolic and -Weight Loss Surgery Center. * Normal lung function. * No clinical history of atopy. * No significant medical or psychological issues. * Healthy subjects able to undergo sputum induction without complications. * Willing and able to give informed consent and adhere to visit/protocol schedules. * Read and write in English.
Exclusion criteria
* Children \< 21 years of age. * Inpatient status. * Ineligibility or not scheduled for bariatric surgery at the Duke Metabolic and Weight Loss Surgery Center. * FEV1 is less than 45% predicted before, or less than 55% predicted after, bronchodilator administration. * Upper or lower respiratory tract infection within one month of the study. * Use of systemic corticosteroids within four weeks of study. * Smoking (tobacco, e-cigarette, vaping or inhaled drugs) history \> 5 pack years or smoking or vaping within the previous six months. * Significant non-asthma pulmonary disease (stable obstructive sleep apnea is not excluded). * An ED visit or inpatient admission for a primary respiratory diagnosis within 60 days of enrollment. * Poorly controlled concomitant conditions that pose additional procedure risk as determined by the investigator. * All patients on anticoagulants. * Uncontrolled sleep apnea.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Change in leptin levels | Baseline (2 weeks before surgery), 30 days post-surgery, 3 months post-surgery |
| Change in adiponectin levels | Baseline (2 weeks before surgery), 30 days post-surgery, 3 months post-surgery |
| Change in IL-8 levels | Baseline (2 weeks before surgery), 30 days post-surgery, 3 months post-surgery |
| Change in IL-6 levels | Baseline (2 weeks before surgery), 30 days post-surgery, 3 months post-surgery |
| Change in cystatin-c levels | Baseline (2 weeks before surgery), 30 days post-surgery, 3 months post-surgery |
| Change in IL-17 levels | Baseline (2 weeks before surgery), 30 days post-surgery, 3 months post-surgery |
| Change in IL-1beta levels | Baseline (2 weeks before surgery), 30 days post-surgery, 3 months post-surgery |
| Change in TNF-α levels | Baseline (2 weeks before surgery), 30 days post-surgery, 3 months post-surgery |
| Change in YKL-40 levels | Baseline (2 weeks before surgery), 30 days post-surgery, 3 months post-surgery |
| Change in lung function as measured by forced expiratory volume | Baseline (2 weeks before surgery), 30 days post-surgery, 3 months post-surgery |
| Change in lung function as measured by forced vital capacity | Baseline (2 weeks before surgery), 30 days post-surgery, 3 months post-surgery |
| Change in lung function as measured by fractional concentration of exhaled nitro oxide | Baseline (2 weeks before surgery), 30 days post-surgery, 3 months post-surgery |
| Change in lung function as measured by FEV1/FVC | Baseline (2 weeks before surgery), 30 days post-surgery, 3 months post-surgery |
| Change in lung function as measured by forced expiratory flow | Baseline (2 weeks before surgery), 30 days post-surgery, 3 months post-surgery |
Countries
United States
Outcome results
None listed