NCT01257191

A Study to Compare the Effects of Different Sized Particles on Cells in the Nose

Cellular Inflammation Characterization of Nasal Challenges With Fine and Ultrafine Particles

• Status: Completed
• Phase: Phase 1
• Study type: Interventional
• Enrollment: 25 (actual)
• Sponsor: University of California, Los Angeles · Academic / Other
• Sex: All
• Age: 18 Years
• Healthy volunteers: Not accepted

Summary

The goal of this study is to see how the type and size of particles found in air pollution affects inflammation in the nose in people who are skin test positive to at least one allergen. It has been observed that pollution makes allergies worse. It has also been suggested that very small particles may affect allergies more than larger particles.

Detailed description

Cough, bronchitis, asthma, and chronic obstructive pulmonary disease are all associated with elevated pollution particle levels. Researchers believe that particulate pollutants can exacerbate allergy and inflammation and affect asthma and allergy prevalence. In an urban setting such as the Los Angeles Basin, particles generated by vehicular traffic are thought to be important risk factors. Recently, the Environmental Health Centre of Southern California confirmed that there is a strong association between traffic near homes and schools and development of asthma. This study will help researchers describe the effects of various size pollution particles in causing inflammation in the nose. There will be a total of 20 study visits. The study procedures include physical exams, symptom score for nose, nose washes and nose challenges with particulate matter. The particulates will be given in a random order and include the following: saline (sterile salt water), inert carbon particles (Carbon Black), diesel exhaust particles (DEP), small (fine) particles or very small (ultrafine) particles. These last two (fine and ultrafine) particles are obtained from concentrated normal Los Angeles air. The particulate will be sprayed into the nose with a standard nasal spray.

Conditions

• Hypersensitivity, Immediate
• Atopic Hypersensitivity

Interventions

Type	Name	Description
DRUG	Carbon Black	source: commercial
DRUG	Diesel Exhaust Particles	source: diesel engine
DRUG	Fine Concentrated Ambient Particles	source: concentrated ambient air
DRUG	Ultrafine Concentrated Ambient Particles	source: concentrated ambient air
DRUG	Saline	Saline solution

Timeline

• Start date: 2010-04-01
• Primary completion: 2012-01-01
• Completion: 2012-01-01
• First posted: 2010-12-09
• Last updated: 2017-01-11

Locations

1 site across 1 country: United States