Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Diisocyanate conjugate and immunoassay characteristics influence detection of specific antibodies in HDI-exposed workers.

Authors
Campo-P; Wisnewski-AV; Lummus-Z; Cartier-A; Malo-JL; Boulet-LP; Bernstein-DI
Source
Clin Exp Allergy 2007 Jul; 37(7):1095-1102
NIOSHTIC No.
20032717
Abstract
BACKGROUND: The structural characteristics of diisocyanate chemical protein antigens vary depending upon the methods of production, and may influence diisocyanate antigen immunoassays. The impact of different antigen preparation methods on immunoassay sensitivity, specificity, and predictive value for identifying workers with diisocyanate asthma (DA) has not been systematically evaluated. OBJECTIVE: Evaluate the influence of preparation methodology of hexamethylene diisocyanate human serum albumin (HDI-HSA) conjugates on the performance of specific antibody assays for identifying workers with confirmed HDI asthma. METHODS: Asthmatic reactions to HDI exposure were assessed in 80 autobody shop workers by specific inhalation challenge (SIC). HDI-specific IgE and IgG in serum were measured by RAST and ELISA with seven different HDI-HSA conjugates prepared in liquid phase with monomeric or polymeric HDI, or vapour-phase monomeric HDI. The HDI : HSA substitution ratios were determined by mass spectrometry. RESULTS: DA was confirmed by SIC in 23 subjects. The maximal sensitivity for detecting specific IgE among workers with positive SIC results was higher with RAST and with polymeric vs. monomeric HDI-albumin conjugates (21.7% vs. 8.7%) with a generally high specificity (>or=95%). HDI-HSA specific IgG antibody was also detected in 22-43% of HDI asthmatics depending upon the conjugate used. The specificity of specific IgG varied from 88% to 96%, and it was higher for monomeric (vs. polymeric) HDI-albumin conjugates with low (vs. high) substitution ratios. CONCLUSION: The test performance of specific IgE and IgG immunoassays for identifying a positive SIC response varied with different HDI-HSA conjugates. Standard test antigens and common immunoassays must be used to minimize inter-laboratory variability.
Keywords
Humans; Biological-factors; Immune-reaction; Immunochemistry; Immunological-tests; Antibody-response; Work-areas; Work-environment; Worker-health; Workplace-studies
Contact
Department of Internal Medicine, Division of Immunology, College of Medicine, University of Cincinnati, 231 Albert Sabin Way, Cincinnati, OH 45267-0563
CODEN
CLEAEN
Publication Date
20070701
Document Type
Journal Article
Email Address
bernstdd@ucmail.uc.edu
Funding Amount
1343329
Funding Type
Grant
Fiscal Year
2007
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-003519; Grant-Number-R01-OH-008795
Issue of Publication
7
ISSN
0954-7894
Priority Area
Disease and Injury: Asthma and Chronic Obstructive Pulmonary Disease
Source Name
Clinical and Experimental Allergy
State
OH
Performing Organization
University of Cincinnati, Cincinnati, OH
TOP