Journal of Preventive Medicine and Public Health

The Korean Society for Preventive Medicine (대한예방의학회)
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Effect of Glutathione on Lead Induced Modulation of NO Synthesis in RAW 264.7 Cell

RAW 264.7 Cell에서 납에 의한 NO 생성의 조절에 미치는 Glutathione의 효과

  • Oh, Gyung-Jae (Department of Preventive Medicine and Public Health, Wonkwang University Medical School) ;
  • Kwon, Keun-Sang (Department of Preventive Medicine and Public Health, Chonbuk National University Medical School and Institute for Medical Sciences) ;
  • Yoon, Wook-Hee (Department of Preventive Medicine and Public Health, Chonbuk National University Medical School and Institute for Medical Sciences) ;
  • Shin, Sae-Ron (Department of Preventive Medicine and Public Health, Chonbuk National University Medical School and Institute for Medical Sciences)
  • 오경재 (원광대학교 의과대학 예방의학교실) ;
  • 권근상 (전북대학교 의과대학 예방의학교실 및 의과학연구소) ;
  • 윤욱희 (전북대학교 의과대학 예방의학교실 및 의과학연구소) ;
  • 신새론 (전북대학교 의과대학 예방의학교실 및 의과학연구소)
  • Published : 2002.12.01
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Abstract

Objectives : To evaluate the elect of glutathione(GSH) on lead induced modulation of nitric oxide(NO) synthesis, and to examine how lead modulates NO production in macrophages. Methods : This study was observed in a culture of RAW 264.7 cells, which originated from a tumor in a Balb/c mouse that was induced by the Abelson murine leukemia virus. The compounds investigated were lead chloride, N-acetyl-cystein(NAC), and Buthionine Sulfoximine( BSO). Results : ATP synthesis in RAW 264.7 cells was unchanged by each lead concentration exposure in a dose dependent manner. The NO synthesis was decreased when exposed to lead($PbCl_2$) concentration $0.5{\mu}M$. The presence of $300{\mu}M$ NAC, used as a pretreatment in the culture medium, caused the recovery of the lead induced decrease in NO synthesis, but in the presence of $300{\mu}M$ BSO as a pretreatment, there was no recoverey. Pretreatment with NAC and BSO had no affect on ATP synthesis at any of the lead concentrations used. Conclusions : These results indicated that GSH has a protective effect toward lead toxicity, and suggested that the inhibition of NO production in macrophage due to lead toxicity may be related to cofactors of iNOS (inducible nitric oxide synthase)

Balb/c 마우스의 복강내에 Abelson leukemia virus (A-MuLV)를 주입하여 발생시킨 대식세포주 RAW 264.7 세포의 배양조건에 납과 NAC및 BSO를 첨가하여 세포생존율과 NO 및 ATP 생성량의 변화를 관찰한 결과, 납을 처리한 기본배양조건에서 RAW 264.7 세포의 생존율은 각 농도에서 차이가 없었으며 NO의 생성량은 $0.5{\mu}M$의 납농도에서부터 용량 의존적으로 감소하였으나 ATP의 생성량은 각 농도군에서 차이가 없었다. NAC을 전처리하고 납을 처리한 배양조건에서의 NO 및 ATP의 생성량은 대조군과 차이가 없었다. BSO를 전처리하고 납을 처리한 배양조건에서의 NO의 생성량은 납만 처리했을 때와 달리 각각의 농도군에서 대조군과 차이가 있었다. ATP생성량은 역시 차이가 없었다. 이상의 결과에서 납의 농도가 증가함에 따라 ATP의 생성량은 변화가 없으면서 NO가 감소하는 것을 볼 때, 납에 의한 대식세포에서 NO생성의 억제기전은 수은 및 카드뮴 등과 같이 미토콘드리아에 영향을 미쳐 ATP생성이 억제됨으로 L-arginine-NO경로에서 ATP를 필요로 하는 iNOS가 작용을 못하여 NO 생성이 저하되는 기전과는 다른 기전이 있음을 보여준다. 또한 iNOS의 조효소인 세포내 GSH를 증가시키는 NAC을 전처리했을 때 NO의 생성량이 대조군 수준으로 회복되고 세포내 GSH를 감소시키는 BSO를 전처리했을 때는 오히려 NO의 생성량에 영향을 미치지 않는 납의 농도에서조차 NO 생성의 감소가 일어난 것으로 볼 때 GSH는 대식세포에서 NO생성을 저하시키는 납의 독성에 보호작용이 있음을 확인할 수 있었다.

Keywords

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