Document Detail


Bronchial responsiveness and inflammation in guinea-pigs exposed to toluene diisocyanate: a study on single and repeated exposure.
MedLine Citation:
PMID:  8947608     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The question of whether or not toluene diisocyanate (TDI)-induced airway hyperresponsiveness in the guinea-pig is accompanied by neutrophil influx into bronchoalveolar lavage fluid (BALF) was addressed. Two modes of exposure were studied; (1) acute exposures where animals were exposed to 3 ppm TDI for 1 h and experiments were carried out 30 min, 4 h, 24 h, 48 h and 1 week after the TDI exposures; (2) subacute exposures where animals were exposed to 0.080 and 0.046 ppm TDI for 48 h 1 week, respectively, and experiments were carried out 24 h after the TDI exposures. The changes in airway responsiveness to increasing doses of intravenous acetylcholine (ACh) in anaesthetized and tracheotomized spontaneously breathing guinea-pigs were examined. In order to elucidate the possible relationships of airway responsiveness to cellular infiltration, bronchoalveolar lavage was performed in additional group of guinea-pigs exposed to the same conditions. After acute exposure to 3 ppm TDI, increased bronchial responsiveness was evident within 30 min, lasted 48 h, but had vanished 1 week after the exposure. An influx of neutrophils occurred into the BALF within 1 h after exposure. The influx of neutrophil into BALF lasted 48 h and vanished 1 week after the end of exposure. After 48 h of exposure to TDI at 0.080 ppm, or 0.046 ppm for 1 week, increased bronchial responsiveness was evident 24 h after the end of the both modes of exposure, but no influx of neutrophils was observed into the BALF. It was concluded that even though the neutrophil influx and hyperresponsiveness evolve in the same way after acute exposure to a high concentration of TDI (3 ppm), this is not the case after subchronic exposure to low concentrations of TDI, where a bronchial hyperresponsiveness is observed without detectable neutrophil influx.
Authors:
F Gagnaire; M Ban; J C Micillino; M Lemonnier; P Bonnet
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Toxicology     Volume:  114     ISSN:  0300-483X     ISO Abbreviation:  Toxicology     Publication Date:  1996 Dec 
Date Detail:
Created Date:  1997-01-02     Completed Date:  1997-01-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0361055     Medline TA:  Toxicology     Country:  IRELAND    
Other Details:
Languages:  eng     Pagination:  91-100     Citation Subset:  IM    
Affiliation:
Institut National de Recherche et de Sécurité, Service Toxicologie Industrielle Expérimentale, Vandoeuvre, France.
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MeSH Terms
Descriptor/Qualifier:
Acetylcholine / administration & dosage
Administration, Inhalation
Animals
Bronchi / drug effects*
Bronchial Hyperreactivity / chemically induced*
Bronchoalveolar Lavage Fluid / cytology
Female
Guinea Pigs
Inflammation / chemically induced*
Neutrophils / drug effects*,  physiology
Time Factors
Toluene 2,4-Diisocyanate / administration & dosage,  toxicity*
Chemical
Reg. No./Substance:
51-84-3/Acetylcholine; 584-84-9/Toluene 2,4-Diisocyanate

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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