Pollutant Altered Allergic Responses

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: NCT00011440
Recruitment Status : Completed
First Posted : February 21, 2001
Last Update Posted : March 23, 2006
Information provided by:
National Institute of Environmental Health Sciences (NIEHS)

Brief Summary:
This study is designed to investigate whether exposure to particulate air pollution increases the allergic response to allergens. Research studies suggest that symptoms in individuals with allergies may be aggravated by exposure to particulate air pollution. We sought to experimental determine this by exposing human volunteers to combustion particles, a component of air pollution, and then challenge them with an allergen such as ragweed or oak tree pollen. Using biological tests we can measure whether the allergen response is magnified by prior particulate exposure.

Condition or disease
Allergic Rhinitis Allergy

Detailed Description:
To study whether particulates enhance the allergic response, we chose the upper airway as a model of allergic inflammation and nasal lavage as a non-invasive method for obtaining samples. The nasal cavity is both an excellent model of allergic inflammation and provides an easily accessible site for study. We measured inflammatory cells and cytokines in the nasal lavage fluid. Our specific hypothesis was that particulate exposure prior to allergen challenge would enhance inflammatory cell recruitment and expression of inflammatory cytokines.

Study Type : Observational
Enrollment : 20 participants
Allocation: Random Sample
Observational Model: Natural History
Time Perspective: Longitudinal
Time Perspective: Prospective
Official Title: Markers of Pollutant Altered Allergic Responses
Study Start Date : December 1998
Study Completion Date : August 2002

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 60 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Adult without a history of asthma or respiratory disease.

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): NCT00011440

United States, Massachusetts
Harvard School of Public Health
Boston, Massachusetts, United States, 02115
Sponsors and Collaborators
National Institute of Environmental Health Sciences (NIEHS) Identifier: NCT00011440     History of Changes
Other Study ID Numbers: 8077-CP-001
First Posted: February 21, 2001    Key Record Dates
Last Update Posted: March 23, 2006
Last Verified: March 2006

Keywords provided by National Institute of Environmental Health Sciences (NIEHS):
Air pollution
Lung function

Additional relevant MeSH terms:
Rhinitis, Allergic
Nose Diseases
Respiratory Tract Diseases
Respiratory Tract Infections
Otorhinolaryngologic Diseases
Respiratory Hypersensitivity
Hypersensitivity, Immediate
Immune System Diseases