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Cytochrome P450 Epoxygenase Pathway Regulation of Macrophage Function

NCT02743468 · Status: COMPLETED · Type: OBSERVATIONAL · Enrollment: 20

Last updated 2026-05-22

No results posted yet for this study

Summary

Background:

Respiratory diseases affect more than 1 billion people worldwide. They are a growing public health concern. The lungs are constantly exposed to environmental factors such as dust, fumes, microbes, and pollutants. But much is still not known about how these pollutants lead to respiratory illnesses. Researchers want to collect samples from lungs and blood to see how genetics and environmental pollutants affect cellular responses or functioning.

Objectives:

To study how cytochrome P450 epoxygenase pathway enzymes affect macrophage function in the lungs and inflammatory responses.

Eligibility:

Adults ages 18 65 who can have a bronchoscopy.

Design:

All study visits will take place at the NIEHS Clinical Research Unit in Research Triangle Park, NC.

At study visit 1, participants will be screened with medical history and physical exam. They will have blood and urine tests. They will take tests that measure their lung function. They will answer questionnaires. Before the visit, they will be given a list of medicines they cannot take. They also must not have caffeine on the day of their visit. The visit will last about 3 hours.

At study visit 2, participants will give blood samples. They will undergo bronchoscopy. For this, they will get an intravenous line in a vein to get sedatives. Their airways will be numbed. Cells will be collected from their lungs. They will fast for 8 hours before the visit. They must have someone else drive them home from the visit. The visit will last about 3-4 hours.

Participants will get a follow-up phone call about 1 day after study visit 2.

Conditions

  • Polymorphism
  • Lung Inflammation

Sponsors & Collaborators

  • National Institute of Environmental Health Sciences (NIEHS)

    lead NIH

Principal Investigators

  • Darryl C Zeldin, M.D. · National Institute of Environmental Health Sciences (NIEHS)

Eligibility

Min Age
18 Years
Max Age
65 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2019-01-08
Primary Completion
2019-12-18
Completion
2023-09-21

Countries

  • United States

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT02743468 on ClinicalTrials.gov