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Related Experiment Videos

Decrease in the rat bronchial acetylcholinesterase activity after toluene diisocyanate inhalation.

M T Brondeau1, M Ban, P Simon

  • 1Institut National de Recherche et de Sécurité, Vandoeuvre, France.

Journal of Applied Toxicology : JAT
|December 1, 1990
PubMed
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Toluene diisocyanate (TDI) inhalation exposure reduces bronchial acetylcholinesterase (AChE) activity in rats, particularly after repeated exposure. Blood AChE levels remained unaffected, indicating localized effects in the airways.

Area of Science:

  • Toxicology
  • Occupational Health
  • Biochemistry

Background:

  • Toluene diisocyanate (TDI) is an industrial chemical with known respiratory irritant properties.
  • Acetylcholinesterase (AChE) is a critical enzyme in nerve function, and its inhibition can have significant toxicological implications.
  • Previous research has not definitively established the localized effects of TDI on AChE activity in the respiratory tract in vivo.

Purpose of the Study:

  • To investigate the in vivo effects of single and repeated toluene diisocyanate (TDI) inhalation exposure on acetylcholinesterase (AChE) activity in rat bronchial tissue and blood.
  • To determine if TDI exposure leads to localized anti-AChE activity within the bronchial smooth muscle.

Main Methods:

  • Rats were exposed to varying concentrations and durations of TDI via inhalation.

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  • Acetylcholinesterase (AChE) activity was measured in homogenized bronchial tissue and blood samples.
  • Immunohistochemical staining was used to assess AChE levels in bronchial smooth muscle.

    • Main Results:

    • A single 4-h exposure to TDI (0.7-4.3 ppm) did not affect bronchial AChE activity.
    • Repeated 4-h daily exposures to TDI (≥0.6 ppm) for two consecutive days significantly reduced bronchial AChE activity (19-33%).
    • Blood AChE activity remained unchanged across all exposure conditions, and further increases in TDI concentration or exposure duration did not exacerbate the reduction in bronchial AChE activity. Bronchial smooth muscle staining for AChE was reduced after 3 weeks of exposure to 1 ppm TDI.

    Conclusions:

    • TDI exposure, particularly repeated inhalation, induces localized anti-acetylcholinesterase (AChE) activity in rat bronchial tissue.
    • The observed effects are specific to the airways, as blood AChE activity remains unaffected.
    • These findings provide the first in vivo evidence of TDI-induced localized anti-AChE activity in the respiratory tract.