Toxicological Research

Korean Society of Toxicology & Korea Environmental Mutagen Society (한국독성학회)
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Noninvasive Monitoring of Bleomycin-induced Lung Injury in Rats Using Pulmonary Function Test

  • Yang, Mi-Jin (Division of Inhalation Toxicology, KIT Jeongeup Campus) ;
  • Yang, Young-Su (Division of Inhalation Toxicology, KIT Jeongeup Campus) ;
  • Kim, Yong-Bum (Division of Inhalation Toxicology, KIT Jeongeup Campus) ;
  • Cho, Kyu-Hyuk (Division of Inhalation Toxicology, KIT Jeongeup Campus) ;
  • Heo, Jeong-Doo (Division of Inhalation Toxicology, KIT Jeongeup Campus) ;
  • Lee, Kyu-Hong (Division of Inhalation Toxicology, KIT Jeongeup Campus) ;
  • Song, Chang-Woo (Division of Inhalation Toxicology, KIT Jeongeup Campus)
  • Published : 2008.12.01
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Abstract

The single intratracheal instillation (ITI) of bleomycin (BLM) is a widely used method for inducing experimental pulmonary fibrosis in rat model. In the present study, pulmonary function tests (PFTs) of tidal volume ($V_T$), minute volume ($V_M$), and respiratory frequency ($F_R$) have been applied to study their possibility as a tool to monitor the progress of BLM-induced lung injury in rat model. Rats were treated with a single ITI of BLM (2.5 mg/kg) or saline (control). Animals were euthanized at 3, 7, 14, 21, and 28 days post-ITI. Lung toxicity effects were evaluated by inflammatory cell count, lactate dehydrogenase (LDH) activity in the bronchoalveolar lavage fluid (BALF), and light microscopic examination of lung injury. The PFT parameters were measured immediately before the animals were sacrificed. BLM treatment induced significant cellular changes in BALF-increase in number of total cells, neutrophils, and lymphocytes along with sustained increase in number of macrophages compared to the controls at days 3, 7, and 14. BALF LDH level was significantly increased compared to that in the controls up to day 14. On day 3, infiltration of neutrophils was observed in the alveolar spaces. These changes developed into marked peribronchiolar and interstitial infiltration by inflammatory cells, and extensive thickening of the interalveolar septa on day 7. At 14, 21, and 28 days, mild peribronchiolar fibrosis was observed along with inflammatory cell infiltration. The results of PFT show significant consistencies compared to the results of other toxicity tests. These data demonstrate that the most suitable time point for assessing lung fibrosis in this model is 14 days post-ITI of BLM based on the observation of fibrosis at 14, 21, and 28 days. Further, the progress of lung injury can be traced by monitoring the PFT parameters of $F_R$, $V_T$, and $V_M$.

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References

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