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Ameliorating Effects of Moxifloxacin on Endotoxin-Induced Acute Lung Injury in Rats

흰쥐에서 내독소로 유도된 급성 폐손상에서 moxofloxacin의 개선효과

  • Lee, Young-Man (Department of Physiology, Daegu Catholic University) ;
  • Chae, Whi-Gun (Department of Biochemistry, School of Medicine, Daegu Catholic University)
  • 이영만 (대구가톨릭대학교 의과대학 생리학교실) ;
  • 최휘건 (대구가톨릭대학교 의과대학 생화학교실)
  • Received : 2011.07.13
  • Accepted : 2011.07.29
  • Published : 2011.08.30

Abstract

The immunomodulating effects of moxifloxacin seem to be effective in downregulating inflammatory reactions. This presumed effect was tested in endotoxin (ETX)-induced acute lung injury (ALI) in rats. After moxifloxacin treatment (10 mg/kg) of ETX-given rats, lung myeloperoxidase (MPO) activity, bronchoalveolar-lavage (BAL) protein, and the number of neutrophils in the BAL cells were measured. Light and electron microscopic structures were also examined. Electron microscopic $CeCl_3$ histochemistry for the detection of hydrogen peroxide in the lungs and immunohistochemistry of cytosolic phospholipase A2 (cPLA2) in the lung tissues and BAL cells were performed. To examine the expression of TNF${\alpha}$ in the lungs, western blotting was carried out with the lung tissues. ETX had accumulated neutrophils in the lungs, which was followed by lung leak. Oxidative stress occurred, and increased expression of cPLA2 in the lung tissues and BAL cells was observed in the ETX-given rats. Simultaneously, the expression of TNF${\alpha}$ was enhanced by ETX. Moxifloxacin, however, decreased all these parameters, indicating that ALI may have been ameliorated. Moxifloxacin appears to ameliorate ETX-induced ALI partially through the suppression of cPLA2 in the lungs of rats.

흰쥐에서 내독소로 유도된 급성 폐손상에서 moxifloxacin의 효과를 형태학적으로 호중구의 폐장 내 침윤 및 세포질형 포스포리파아제(cytosolic phospholipase A2) 발현과 관련하여 알아보았다. 내독소는 잘 알려진대로 흰쥐에서 급성 폐손상을 유발하였고 이때 폐장 내의 호중구의 침윤 및 폐장 및 호중구에서의 세포질형 포스포리파아제의 발현이 증가하였고, 또한 염증성 사이토카인의 일종인 종양괴사성인자(tumor necrosis factor)의 발현도 증가하였다. 전자현미경을 이용한 산소기 생성의 검사에서도 내독소에 의하여 산소기의 생성이 폐장 내에 증가한 사실을 확인하였고, 산화성 스트레스에 유발되는 제2형 폐포세포에서의 층상체의 변화도 관찰하였다. 면역변환효과가 있다고 알려진 moxifloxacin은 이러한 변화들을 억제하고 형태학적으로 내독소에 의한 급성 폐손상을 현저히 감소시켰다.

Keywords

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