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마우스 Hepa-1c1c7 세포주에서 B형 간염 바이러스에 의한 tumor necrosis factor-a의 발현 유도

Hepatitis B Virus-Induced TNF-a Expression in Hepa-lc1c7 Mouse Hepatoma Cell Line

  • 예성수 (인제대학교 의과대학 생화학교실) ;
  • 장원희 (백인제임상의학연구소) ;
  • 양영일 (백인제임상의학연구소, 병리학교실) ;
  • 이연재 (인제대학교 의과대학 내과학교실) ;
  • 김미성 (백인제임상의학연구소) ;
  • 석대현 (인제대학교 의과대학 생화학교실) ;
  • 박영홍 (인제대학교 의과대학 생화학교실) ;
  • 백계형 (백인제임상의학연구소)
  • Yea Sung Su (Department of Biochemistry, College of Medicine, Inje University) ;
  • Jang Won Hee (Paik Institute for Clinical Research) ;
  • Yang Young-Il (Paik Institute for Clinical Research, Department of Pathology, College of Medicine, Inje University) ;
  • Lee Youn Jae (Department of Internal Medicine, College of Medicine, Inje University) ;
  • Kim Mi Seong (Paik Institute for Clinical Research) ;
  • Seog Dae-Hyun (Department of Biochemistry, College of Medicine, Inje University) ;
  • Park Yeong-Hong (Department of Biochemistry, College of Medicine, Inje University) ;
  • Paik Kye-Hyung (Paik Institute for Clinical Research)
  • 발행 : 2005.02.01

초록

B형 간염 바이러스(HBV)에 의한 감염은 인류의 보건에 대단히 중요한 문제이며, 따라서 HBV에 대한 많은 연구가 수행되어져 왔다. 그러나 HBV 연구에 있어서의 주된 장애요인은 그 감염이 사람과 일부 영장류에 국한된다는 점이다. 본 연구에서는 마우스 간암 세포주인 Hepa-1c1c7 세포를 이용하여 HBV의 감염성 및 그에 따른 염증성 사이토카인인 TNF-a의 발현의 변화를 측정하였다. HBV의 표면항원(HBsAg)분비는 microparticle enzyme immunoassay를 사용하여 측정하였고, TNF-a mRNA 발현 측정에는 quantitative competitive RT-PCR 방법을 사용하였다. HBV 발현 벡터를 Hepa-1clc7 세포에 도입시켰을 경우뿐만 아니라 HBV 비리온을 갖고 있는 혈청을 사용하여 Hepa-lc1c7 세포를 감염시켰을 때에도 HBV mRNA 발현 및 HBsAg 분비가 측정되었다. 또한 두 상황 모두에서 TNF-a mRNA발현이 증가됨을 알 수 있었다. 이러한 결과는 사람과 영장류에 특이적인 HBV가 마우스 간암 세포주인 Hepa-lclc7 세포도 감염시킬 수 있다는 가능성을 제시한다. 또한 마우스 기원의 Hepa-lclc7 세포에서도 HBV의 유전자 발현에 필요한 여러 인자들이 존재하며, TNF-a와 같은 사이토카인 유전자 발현을 조절하는 세포 내 기전에 HBV가 영향을 미친다고 할 수 있다. 따라서 마우스 간암 세포주인 Hepa-lclc7 세포는 HBV 연구를 위한 시험 관내 모델로서 사용되어질 수 있을 것으로 보인다.

Infection with hepatitis B virus (HBV) is a major health problem worldwide. Although a tremendous amount has been known about HBV, there have been obstacles in the study of HBV due to the narrow host range of HBV limited to humans and primates. In the present study, we investigated the susceptibility to HBV infection of mouse hepatoma cell line, Hepa-1c1c7. In addition, based on that human hepatocytes infected by HBV increase the expression of the pro-inflammatory cytokine TNF-a, the inducibility of TNF-a expression by HBV in the cells was determined. HBV surface antigen (HBsAg) secretion was measured by the microparticle enzyme immunoassay and steady state mRNA expression was analyzed by quantitative competitive RT-PCR. Transient transfection of Hepa-1c1c7 cells with HBV expression vector resulted in a dose-dependent induction of TNF-a expression. Infection of Hepa-1c1c7 cells with the serum of HBV carrier also increased TNF-a mRNA expression. Both in the transfected and infected cells, HBV mRNA was expressed and significant HBsAg secretion was detected. There was no significant variation in $\beta-actin$ mRNA expression by HBV. These results demonstrate that HBV is infectious to Hepa-lc1c7 in vitro and the viral infection induces TNF-a expression, which suggests that Hepa-lc1c7, a mouse hepatoma cell line, may be a possible model system for analysis of various molecular aspects of HBV infection.

키워드

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