- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT03234790
Human Study to Develop a Signature of Occupational Diesel Exhaust Exposure (DICE)
A Controlled Dose-Response Human Study to Develop a Signature of Occupational Diesel Exhaust Exposure
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
- Purpose: Over 100,000 employees in Alberta are inadvertently exposed to diesel exhaust at work because of wide use of diesel engines in vehicles and machines used in road construction, trucking, forestry, oil extraction and mineral mining. Although ambient air monitoring of DE exposure exists in some occupational settings, ambient air monitoring depends heavily on surrogate models and may yield a distorted picture of past exhaust exposure. Thus, a clear exposure limit based on bio-monitoring is needed to adequately protect the workers.
- Objective: Our research aims to establish the relationship between exposure concentration and biological effect as an aid to determination of reference ranges for acceptable exposure.
Hypotheses and Aims:
Hypothesis 1: Diesel exhaust (DE) inhalation elicits a characteristic protein output, in a dose-dependent manner.
Aim 1. Demonstrate, using a proteomic analysis of serum and urine, a signature that acutely increases in response to a range of occupationally relevant DE concentrations.
Hypothesis 2: DE inhalation increases concentrations of metabolites of polyaromatic hydrocarbons (PAH) in urine, in a dose-dependent manner.
Aim 2. Ascertain the range of PAH metabolites accumulation in urine following acute exposure to a range of occupationally relevant DE concentrations.
Hypothesis 3: DE inhalation alters the airway responsiveness to a contractile stimulus, in a dose-dependent manner, and that alteration is associated with changes in a combined proteomic/PAH-metabolomic signature.
Aim 3: Determine the dose-response slope to methacholine, in response to a range of occupationally relevant DE concentrations, and correlate changes in this slope to changes in proteins and metabolites.
Additionally, we aim to establish the relationship between a range of controlled DE exposure concentrations and sleep quality and breathing in sleep through the sub-study component.
Justification:
Our work will inform decision makers and stakeholders in creating evidence-based policies to limit occupational diesel exhaust exposure based on relevant biology.
Research Method:
This is an order-randomized, double-blinded, crossover human exposure study.
This project aims to determine markers of DE exposure that can be used in an occupational setting. Therefore, we will use a range of occupational exposure levels to appropriately contextualize our results. For this, 20 healthy participants will be exposed to a control condition and 3 different levels of DE concentration, each for a period of 4 hours, in a randomized order. Each exposure will be separated by a washout period of two weeks. The levels will be DE titrated to 20, 50 and 150 ug/m3 PM2.5, and the control exposure will be filtered air (FA).
Participants will undergo a methacholine challenge and will provide urine and blood samples before and after exposures to analyze lung function and biological responses.
If participants consent to participation in the sleep sub-study, they will be provided with additional questionnaires throughout their visits pertaining to their sleep quality. The participants will be provided with an Alice NightOne sleep monitor and instructions on how to operate the equipment. The sleep monitor will be hooked up by the participant at home when they are about to sleep, following an exposure, and will monitor their sleep patterns for that night.
- Statistical Analysis:
First, the changes in clinical parameters (methacholine PC20 and dose response slope) and serum blood protein abundance between pre- and post-exposure will be determined. These 'delta' values will be statistically compared across exposures using linear mixed effects models using R program, as outlined in our previous publications from similarly-designed protocols from our group. Values of p<0.05 will be considered significant throughout, with adjustments for multiple comparisons. Although the 2-week washout period is intended to minimize the likelihood of carryover effects, we will formally assess for this by including a term for order of exposures in the models.
Analyses for the sleep component will be performed at the Hospital of Ottawa and will be completed through a linear or logistic mixed effects model, as applicable using the R program. Similar methods to data collected from the main study. Data interpretation will be completed through a software algorithm on the local server.
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
-
-
British Columbia
-
Vancouver, British Columbia, Canada, V5Z 1M9
- University of British Columbia - VGH site
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- 19-49 years
- Non-smokers
- No physician diagnosed asthma
Exclusion Criteria:
- Pregnant/breastfeeding
- Using inhaled corticosteroids
- Co-existing medical conditions (as assessed by the primary investigator)
- Taking part in another study that involves taking medications.
- Abnormal lung function based on screening spirometry
- Cardiac diagnosis or arrhythmia is discovered during the screening process
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Screening
- Allocation: Randomized
- Interventional Model: Crossover Assignment
- Masking: Triple
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Active Comparator: Filtered Air Exposure
Exposure for 4 hours to filtered air
|
Exposure to Filtered air
|
Experimental: Diesel Exhaust Exposure
Volunteers exposed to different concentrations of diesel exhaust
|
Diesel exposure to different concentrations at different times: 20, 50 and 150ug/m3
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Serum proteome in response to DE exposure
Time Frame: 4 hours & 24 hours
|
Serum from each experimental condition will be analyzed by liquid chromatography-mass spectrometry (LC-MS/MS) to observe any changes between the baseline and listed time points
|
4 hours & 24 hours
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Urine proteins in response to DE exposure
Time Frame: 4 hours & 24 hours
|
Urine from each experimental condition will be analyzed by liquid mass chromatography to observe any changes between the baseline and listed time points.
|
4 hours & 24 hours
|
Polycyclic Aromatic Hydrocarbons (PAH) metabolites in response to DE exposure
Time Frame: 4 hours & 24 hours
|
PAH metabolites in urine samples will be analyzed by HPLC to observe any changes between the baseline and listed time points.
|
4 hours & 24 hours
|
Sleep quality
Time Frame: baseline versus 24 hours post-exposure
|
Sleep quality will be assessed by level 3 overnight monitor and questionnaires
|
baseline versus 24 hours post-exposure
|
Collaborators and Investigators
Sponsor
Publications and helpful links
General Publications
- Guest PC, Gottschalk MG, Bahn S. Proteomics: improving biomarker translation to modern medicine? Genome Med. 2013 Feb 27;5(2):17. doi: 10.1186/gm421. eCollection 2013. No abstract available.
- Huang W, Smith TJ, Ngo L, Wang T, Chen H, Wu F, Herrick RF, Christiani DC, Ding H. Characterizing and biological monitoring of polycyclic aromatic hydrocarbons in exposures to diesel exhaust. Environ Sci Technol. 2007 Apr 15;41(8):2711-6. doi: 10.1021/es062863j.
- Morgott DA. Factors and Trends Affecting the Identification of a Reliable Biomarker for Diesel Exhaust Exposure. Crit Rev Environ Sci Technol. 2014 Aug;44(16):1795-1864. doi: 10.1080/10643389.2013.790748.
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Other Study ID Numbers
- H16-03053
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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