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Sequential changes in lung metabolism, permeability, and edema after ANTU.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|February 1, 1987
Summary
Alpha-naphthylthiourea (ANTU) causes lung injury by increasing alveolar-capillary barrier permeability, leading to pulmonary edema. Prostaglandin E2 metabolism abnormalities persist even after lung injury recovery.
Area of Science:
- Pulmonary Medicine
- Toxicology
- Pharmacology
Background:
- Alpha-naphthylthiourea (ANTU) is a known inducer of acute lung injury and pulmonary edema in animal models.
- Understanding the temporal dynamics of lung injury markers is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the time course of lung injury development and recovery following ANTU administration in rats.
- To assess changes in alveolar-capillary barrier permeability and prostaglandin E2 (PGE2) pharmacokinetics during ANTU-induced lung injury.
Main Methods:
- Induction of lung injury in rats using intraperitoneal injection of ANTU (10 mg/kg).
- Assessment of lung injury via 99mTc-diethylenetriamine pentaacetate (99mTcDTPA) lung clearance, [3H]PGE2 pharmacokinetics in isolated perfused lungs, and lung wet-to-dry weight ratio.
- Monitoring changes over time post-ANTU administration.
Main Results:
- Increased 99mTcDTPA clearance, indicating enhanced alveolar-capillary barrier permeability, was observed 2 hours after ANTU.
- Pulmonary edema, measured by lung wet-to-dry weight ratio, became significant at 5 hours post-ANTU.
- [3H]PGE2 pharmacokinetics were significantly altered by ANTU, with persistent changes beyond the recovery of lung permeability and edema.
Conclusions:
- ANTU-induced lung injury involves an early increase in small molecule permeability preceding pulmonary edema.
- Abnormalities in pulmonary microvasculature metabolism, reflected by PGE2 pharmacokinetics, persist after the resolution of lung barrier defects and edema.