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Adjuvant effect of respiratory irritation on pulmonary allergic sensitization: time and site dependency.

https://arctichealth.org/en/permalink/ahliterature15794
Source
Toxicol Appl Pharmacol. 1997 Jun;144(2):356-62
Publication Type
Article
Date
Jun-1997
Author
P D Siegel
N H Al-Humadi
E R Nelson
D M Lewis
A F Hubbs
Author Affiliation
Division of Respiratory Disease Studies, National Institute for Occupational Safety and Health, Morgantown, West Virginia 26505, USA.
Source
Toxicol Appl Pharmacol. 1997 Jun;144(2):356-62
Date
Jun-1997
Language
English
Publication Type
Article
Keywords
Adjuvants, Immunologic - toxicity
Ammonia - toxicity
Animals
Asthma - chemically induced - immunology
Bronchoalveolar Lavage Fluid - cytology
Immunoglobulins - blood - drug effects
Irritants - toxicity
Lung - drug effects - immunology - pathology
Male
Nitrogen Dioxide - toxicity
Ovalbumin - immunology
Rats
Time Factors
Abstract
It has been suggested that airway irritation, by acting as an adjuvant, as well as producing damage, may be an important factor related to asthma. The present study examined the window of time following acute upper and lower airway irritant exposure to determine the period of increased risk of immunological sensitization. Brown Norway rats were exposed to 87 ppm NO2 or 1000 ppm NH3 for 1 hr. A 30-min ovalbumin (OVA) exposure of 18.14 microg/liter air was given at various times based upon the time course of irritant associated inflammatory response (either immediately prior to or 1 or 7 days after the irritant exposure). OVA-only, NO2-only or NH3-only controls, and saline controls were also studied. Weekly booster exposures of OVA (or saline) were given. Circulating OVA-specific IgE, IgA, and IgG levels were quantified periodically during the 6 weeks of the study. Bronchoalveolar lavage (BAL) was also performed to examine the inflammatory response to allergic and irritant challenge. Significant increases in OVA-specific IgE, IgG, and IgA antibody titers were seen in rats given the sensitizing OVA exposure within 1 day of the NO2, but not NH3 exposures. Enhancement of cellular infiltrate in BAL was noted in groups given the sensitizing OVA exposure within 1 day of the NO2 or NH3. It is concluded that the inflammatory and immunological response to antigen exposure can be modified by the site of respiratory tract irritation and the relative times of irritant and antigen exposure.
PubMed ID
9194420 View in PubMed
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