Range of Neutrophil Response to 20,000 EU of Clinical Center Reference Endotoxin in Otherwise Healthy Smokers
April 14, 2011 updated by: University of North Carolina, Chapel Hill
Endotoxin is a component of outdoor air pollution, an air contaminant found in a number of different workplaces, and is even found in homes.
The endotoxin used for this study is obtained from the National Institutes of Health, and is called "Clinical Center Reference Endotoxin", or CCRE.
The purpose of this Phase 1 research study is to identify a dose of inhaled endotoxin that is safe (does not cause prolonged cough, shortness of breath or other problems), but causes changes in sputum cell samples that the scientists can measure.
Phase 1 research studies like this one are not intended to be a treatment, but are a scientific investigation.
Eventually, with these types of studies we will be able to examine why some people are more sensitive to endotoxin.
Scientists at other universities have found that while most people do not have a considerable lung response to endotoxin at doses as high as 60,000 EU (endotoxin units), a few respond to as little as a total dose of 4500 EU.
Our study is designed to identify if using a dose of 20,000 EU causes changes in the lung cells but does not cause symptoms in our study subjects.
In our previous studies in our lab, using an endotoxin from another source, we have used higher doses (15,000 EUs) in subjects with asthma with no major problems, and we have used 10,000 EUs of CCRE in subjects who are current smokers without seeing any problems.
Study Overview
Detailed Description
We are looking for people who currently smoke a minimum of a half a pack of cigarettes each day.
You must not have any other health problems, be pregnant or nursing a baby, or actively trying to become pregnant or to father a child.
Study Type
Interventional
Enrollment (Actual)
2
Phase
- Phase 1
Contacts and Locations
This section provides the contact details for those conducting the study, and information on where this study is being conducted.
Study Locations
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North Carolina
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Chapel Hill, North Carolina, United States, 27599
- UNC Center For Environmental Medicine, Asthma and Lung Biology
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Participation Criteria
Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.
Eligibility Criteria
Ages Eligible for Study
18 years to 50 years (Adult)
Accepts Healthy Volunteers
Yes
Genders Eligible for Study
All
Description
Inclusion Criteria:
- current smoker
- healthy
Exclusion Criteria:
- no asthma
- no chronic health conditions
- no daily cough
- not pregnant or nursing a baby
- not actively trying to get pregnant or father a child
Study Plan
This section provides details of the study plan, including how the study is designed and what the study is measuring.
How is the study designed?
Design Details
- Primary Purpose: Basic Science
- Allocation: Non-Randomized
- Interventional Model: Single Group Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
|---|---|
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Experimental: A
Otherwise healthy smokers
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20,000 EU CCRE given as a one-time challenge
Other Names:
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Time Frame |
|---|---|
|
To identify a dose of inhaled CCRE that is well tolerated and that induces measurable increases in neutrophil content of induced sputum that can be employed to screen large populations for susceptibility to the inflammatory effect of inhaled endotoxin.
Time Frame: post exposure
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post exposure
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Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Investigators
- Principal Investigator: David b Peden, MD, MS, University of North Carolina
Publications and helpful links
The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.
Helpful Links
Study record dates
These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.
Study Major Dates
Study Start
August 1, 2008
Primary Completion (Actual)
December 1, 2009
Study Completion (Actual)
December 1, 2009
Study Registration Dates
First Submitted
September 15, 2008
First Submitted That Met QC Criteria
September 16, 2008
First Posted (Estimate)
September 17, 2008
Study Record Updates
Last Update Posted (Estimate)
April 18, 2011
Last Update Submitted That Met QC Criteria
April 14, 2011
Last Verified
April 1, 2011
More Information
Terms related to this study
Other Study ID Numbers
- 07-2060 (GCRC 2670)
- P50HL084934-01 (U.S. NIH Grant/Contract)
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.