Applied Microscopy

Korean Society of Microscopy (한국현미경학회)
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Effects of Colchicine on Pulmonary Injury Induced by Paraquat

Colchicine이 Paraquat에 의한 폐상해에 미치는 영향

  • Kim, Joong-Kil (Department of pathology, Kyungpook National University, School of Medicine) ;
  • Chang, Moo-Ung (Department of Biology, Yeungnam University) ;
  • Kwak, Jyung-Sik (Depatrment of Forensic medicine, Kyungpook National University, School of Medicine)
  • 김중길 (경북대학교 의과대학 병리학교실) ;
  • 장무웅 (영남대학교 이과대학 생물학과) ;
  • 곽정식 (경북대학교 의과대학 법의학교실)
  • Published : 2003.12.01
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Abstract

This study was undertaken to investigate paraquat-induced pulmonary injuries and effects of colchicine on pulmonary fibrosis by paraquat. Fifteen Sprague-Dawley rats were intraperitoneally injected 10 mg/kg of paraquat and repeatedly with 2 days interval. Another 15 rats were injected paraquat as same manner and simultaneously injected 10 mg/kg of colchicine in a week. Five rats in each group were sacrificed 1, 2, and 4 weeks after initial injections, and lungs extracted were observed by light and electron microscopes. On light microscopy, there was mild infiltration of neutrophils, macrophages, and lymphocytes in alveolar spaces and walls at 1 week after paraquat injection. The cellularity of alveolar wall was increased with time. However, the cellularity was not so prominent in paraquat and colchicine simultaneously injected group. On electron microscopy, there was marked swelling or excoriation of type I epithelial cells and alveolar capillary endothelium with infiltration of neutrophils, macrophages and monocytes, and lymphocytes in alveolar walls. Such findings were persisted with time. In addition, fibroblastic proliferation and deposition of collagen fibers were prominent at 4 weeks after paraquat injection. Fibrosis also occurred at 4 weeks after paraquat and colchicine simultaneous injection. It was not proninent than that of paraquat injected group. According to the above result, it would be concluded that the type I pneumocytes and alveolar capillary endothelial cells are most vulnerable on paraquat poisoning, and that the colchicine is effective on inhibition of paraquat-induced pulmonary fibrosis.

본 연구는 Paraquat에 의한 폐상해와 colchicine이 paraquat에 의한 폐 섬유화에 미치는 영향을 규명하기 위해 Sprague-Dawley 흰쥐에 10 mg/kg의 paraquat을 2일 간격으로 2회 복강내 투여하였고 다른 군은 2회 투여한 후 1주일에 한번씩 10 mg/kg의 colchicine 을 복강내에 투여하였다. 각 군은 paraquat을 처음 투여한 후 1, 2 및 4 주에 폐를 적출하여 광학 및 전자현미경으로 관찰하였다. 광학현미경 소견은 paraquat 투여 후 1주일 이후에는 폐포벽 및 폐포강에 호중구, 대식세포 및 림프구가 침윤하였다. 그리고 폐포벽에는 시간이 지날수록 세포수가 증식하였다. 그러나 colchicine을 같이 투여한 군에서는 폐포벽의 세포증식이 현저하지 않았다. 전자현미경 소견은 paraquat투여 후 I형 폐포세포와 폐포모세혈관 내피세포의 심한 종창과 탈락이 일어났고 폐포벽에는 호중구, 대식세포 및 단구, 림프구의 침윤이 일어났다. 이러한 소견은 시간이 경과하여도 지속되었다. 섬유아세포의 증식과 교원섬유의 축적은 Paraquat 투여 후 4주 째에 가장 현저하였다. colchicine을 같이 투여한 군에서는 섬유화가 일어났으나 paraquat 단독 투여군보다 심하지는 않았다. 이상의 소견으로 보아 paraquat에 의한 폐상해는 I형 폐포세포와 폐포모세혈관 내피세포가 가장 상해를 잘 받으며 colchicine은 paraquat에 의한 폐섬유화를 억제하는 효과가 있음이 인정된다.

Keywords

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