Pathogenesis and Genetics of Environmental Asthma Ozone Study

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00574158
Recruitment Status : Completed
First Posted : December 17, 2007
Last Update Posted : September 29, 2014
Information provided by (Responsible Party):
Michael Foster, National Institute of Environmental Health Sciences (NIEHS)

Brief Summary:

The goals of the research are designed to accomplish genetic association studies of candidate genes in healthy normal individuals exposed to 0.2 ppm for 2.25 hours with intermittent exercise in order to search for associations between defined genotypes/haplotypes and 3 specific in vivo respiratory endpoints: a) change in FEV1 immediately after ozone exposure; b) change nonspecific bronchial reactivity as reflected in the change in methacholine PC20 FEV1 24 hours after ozone exposure ; and c) change in lung epithelial integrity as reflected in the Clearance Halftime of technetium 24 hours after ozone exposure. These studies have been carried forward to take place in 4 phases:

i) healthy individuals have been exposed to O3 using our standard exposure protocol; and we will increase the numbers of individuals available for study.

ii) perform genetic association studies for the endpoints of spirometry (FEV1, FVC, FEV1/FVC), PC20 FEV1 for methacholine, and epithelial integrity (Clearance Halftime) for 3 candidate O3 response genes taken from literature searches and/or previously characterized to demonstrate associations. These physiologic endpoints have been examined in terms of both a continuum of response, and discrete "responder" and "non-responder" endpoints.

Condition or disease
Asthma Inflammation

Study Type : Observational
Actual Enrollment : 170 participants
Observational Model: Cohort
Time Perspective: Prospective
Official Title: Project 2: Genetic Regulation of Ozone Induced Inflammation in Humans.
Study Start Date : July 2005
Actual Primary Completion Date : November 2011
Actual Study Completion Date : June 2012

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Asthma Ozone

Primary Outcome Measures :
  1. Pathogenesis and genetics of environmental asthma ozone study [ Time Frame: acute and at 18 to 24 hour followup. ]
    Phenotype physiologic responses to ambient level of ozone exposure.

Biospecimen Retention:   Samples With DNA
plasma, and ebc collected.

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 35 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Probability Sample
Study Population
Healthy adults, 18-35 y of age, both genders.

Inclusion Criteria:

  • Subjects with normal lung function values, and of normal body habitus (i.e., < BMI of 30);
  • Do not have a history of lung disease, and not taking any medications for lung disease or other clinical disorders, and no prior or current smoking history.

Exclusion Criteria:

  • Non-willingness to sign a consent form for participation.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00574158

United States, North Carolina
W Michael Foster, PhD
Durham, North Carolina, United States, 27710
Sponsors and Collaborators
National Institute of Environmental Health Sciences (NIEHS)
Principal Investigator: W Michael Foster, PhD Duke University

Responsible Party: Michael Foster, Professor, National Institute of Environmental Health Sciences (NIEHS) Identifier: NCT00574158     History of Changes
Other Study ID Numbers: 12496-CP-004
First Posted: December 17, 2007    Key Record Dates
Last Update Posted: September 29, 2014
Last Verified: September 2014

Keywords provided by Michael Foster, National Institute of Environmental Health Sciences (NIEHS):
inflammatory airway disease

Additional relevant MeSH terms:
Bronchial Diseases
Respiratory Tract Diseases
Lung Diseases, Obstructive
Lung Diseases
Respiratory Hypersensitivity
Hypersensitivity, Immediate
Immune System Diseases
Pathologic Processes