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Home > "I" Clinical Trials Conditions > Isocyanate Antigens and T Cells That Cause Asthma  Isocyanate Antigens and T Cells That Cause Asthma
Isocyanate Antigens and T Cells That Cause Asthma
For Condition: Asthma,Lung Diseases
Status: No longer recruiting
Sponsor(s): National Heart, Lung, and Blood Institute (NHLBI) ,
Synopsis: To investigate whether isocyanate-induced asthma is dependent on isocyanate antigen-driven T-cell mediated, airway inflammation.
Details: BACKGROUND: Isocyanates are a group of highly reactive widely used low-molecular weight chemicals, and are the most commonly reported cause of occupation asthma in developed countries. Yet, the mechanisms by which isocyanates cause asthma are not well defined. DESIGN NARRATIVE: The study investigates isocyanate antigen-driven T-cell responses in vitro-, following in vivo exposure using patient samples acquired through collaboration with ongoing field epidemiological and clinical studies. The study compares isocyanate antigen-reactive T-cells from primary exposure sites (skin/lung) with those from blood, to evaluate potential routes of sensitization and identify diagnostic indicators of isocyanate sensitivity/susceptibility. Specifically, the study : generates and characterizes hexamethylene diisocyanate (HDI) antigens including isocyanate metabolites, and isocyanate conjugated t normal human and foreign proteins; evaluates the T-cell antigenicity of the HDI antigens, based on blood and lung lymphocyte proliferation, cytokine production, and phenotype in order to identify the molecular form of HDI that initiates airway cytokine production in asthma patients; establishes T-cell lines from the skin, lung and peripheral blood of HDI asthma patients and characterizes the phenotype, antigen specificity, cytokine production and TCR expression of isocyanate responsive T-cells in these different compartments; compares isocyanate responsive of T-cells found in the skin, lung and blood and correlates with clinical sensitivity to determine characteristics associated with exposure and sensitization leading to clinical asthma. The study was renewed in FY 2002 to extend follow-up and analysis through March 2007.
Eligibility:
Study Type: Observational, Natural History, Defined Population
Minimum Age/Maximum Age: /
Genders: Male
Protocol Entry Criteria: No eligibility criteria
Total Enrollment:
Location and Contact Information:
Overall Study Official:
AdamWisnewski, , Yale University
Additional Information:
Study ID Numbers: 5093;
Study Start Date: January 1999
Record last reviewed: February 2004
Additional information available at: clinicaltrials.gov
Clinicaltrials.gov Reference link: NCT00005549
Other Lung Diseases Studies:
1. Role of T-Cells in Asthma
2. Assessment of Lung Inflammation in Patients with Atopic Asthma Using Positron Emission Tomography
3. Intervention to Improve Asthma Management/Prevention
4. Activation and Function of Eosinophils in Conditions with Blood or Tissue Eosinophilia
5. Controlling Asthma at School
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Isocyanate Antigens and T Cells That Cause Asthma
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