CXCL10/CXCR3 Regulation of Ozone-Induced Epithelial Permeability

  • End date
    Dec 24, 2023
  • participants needed
  • sponsor
    Robert Tighe, MD
Updated on 24 October 2022


The purpose of this research study to understand how environmental and genetic factors may be involved in lung function. Study participants will undergo a 1-day screening that includes a blood draw and breathing testing, return for a two-day series of testing to include blood draw, and brief breathing test before and after an inhaled challenge with either filtered air (FA) or ozone (O3). Participants return the next day for a brief breathing test, a blood draw and a procedure called bronchoscopy to evaluate the lung after the challenge. Participants then return 18 - 20 days later to repeat the two-day series of testing to be challenged with the exposure not received on the first series, (FA or O3). Each visit will take about 3 - 3.5 hours. Follow-up phone calls from the study team will occur at 24 hours after each 2-day test series. Total study duration is about one to one-and a half months.

Condition Environmental and Genetic Factors on Lung Function
Treatment Ozone, Filtered Air
Clinical Study IdentifierNCT03599206
SponsorRobert Tighe, MD
Last Modified on24 October 2022


Yes No Not Sure

Inclusion Criteria

Prior enrollment in the NIEHS Environmental Polymorphism Registry located in the greater Raleigh-Durham area
Wild type or homozygous (female)/hemizygous (male - since sex-linked) expression of the CXCR3 polymorphism rs2280964

Exclusion Criteria

Current smokers of tobacco products including e-cigarettes or those with previous smoking history within the prior 5 years
BMI less than 37 kg/m2
Pregnant women and women who are presently lactating
Subjects that have received antibiotic administration or an upper respiratory infection within the previous 4 weeks
College and graduate students or employees who are under direct supervision by any of the investigators in this protocol
Alcohol or illicit substance abuse
Chronic cardio/pulmonary respiratory disorders or other medical conditions as determined by the investigator
Increased airway hyperresponsiveness at baseline as measured by a positive methacholine challenge response (methacholine PC20 FEV1 < 8 mg/ml)
Subjects will be requested to refrain from antihistamines, nonsteroidal anti-inflammatory agents, antioxidants (e.g. beta-carotene, selenium, and lutein) and supplemental vitamins (e.g. C and E), for 1 week prior to, and during testing
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