Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Effects of Apolipoprotein A-I on Apoptosis and Cytokine Production in Human Neutrophils

인간 호중구의 세포사멸과 시토카인 분비에 대한 아포지방단백 A-I의 영향

  • Kang, Hyung-Kon (Department of Neurosurgery, College of Medicine, Donga-A University) ;
  • Choi, Jae-Hyung (Department of Neurosurgery, College of Medicine, Donga-A University) ;
  • Huh, Jae-Taeck (Department of Neurosurgery, College of Medicine, Donga-A University)
  • 강형곤 (동아대학교 의료원 신경외과학교실) ;
  • 최재형 (동아대학교 의료원 신경외과학교실) ;
  • 허재택 (동아대학교 의료원 신경외과학교실)
  • Received : 2010.08.31
  • Accepted : 2010.09.30
  • Published : 2011.01.30
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Abstract

Apolipoprotein A-I (apoA-I) has anti-inflammatory and anti-oxidative properties. This study was designed to investigate whether apoA-I affects apoptosis and cytokine production of human blood neutrophils in an in vitro culture system. Spontaneous apoptosis of neutrophils was significantly delayed by apoA-I. In addition, high density lipoprotein containing apoA-I also delayed apoptosis of neutrophils. Apoptosis of neutrophils was inhibited by anti-scavenger receptor type B-I antibodies. The amounts of interleukin-8, interferon (IFN)-inducible protein 10 (IP-10), and tumor necrosis factor-$\alpha$ (TNF-$\alpha$) in the supernatants of cultured neutrophils treated with apoA-I were significantly increased. Combined treatment of neutrophils with IFN-$\gamma$ and apoA-I produced higher amounts of IP-10 and TNF-$\alpha$ than did treatment with IFN-$\gamma$ or apoA-I alone. The present study reveals that apoA-I activates neutrophils to produce cytokines and delays spontaneous apoptosis of neutrophils. These findings suggest that apoA-I, although a well-known negative acute-phase protein, has a pro-inflammatory effect in neutrophils.

아포지방단백 A-I (apoA-I)은 항염증 및 항산화 작용을 가지고 있는 것으로 알려져 있다. 본 논문에서는 인간 혈액의 호중구를 이용하여 in vitro 상태에서 세포사멸과 시토카인의 분비 과정에 미치는 apoA-I의 영향을 조사하였다. 인간 호중구에 apoA-I을 처리한 결과 세포사멸의 정도가 감소되었다. 또한, apoA-I을 함유하는 고밀도 지방단백(HDL)에 의하여도 세포사멸은 현저히 감소되었다. HDL이 결합하는 수용체인 scavenger 수용체 B-1에 대한 항체에 의하여도 세포사멸은 억제되었다. ApoA-I을 20 시간 처리한 세포의 배양액내 인터루킨-8, 인터페론-유도단백질 10(IP-10) 및 종양괴사인자-α의 분비가 현저히 증가하였다. 호중구에 인터페론 감마와 apoA-I을 동시 처리하였을 때 시토카인 중에서 IP-10과 종양괴사인자-$\alpha$의 분비가 단독으로 처리한 경우에 비해 현저히 증가되었다. 이러한 결과들은 인간 혈액 호중구에 apoA-I을 처리한 경우 호중구가 활성화되고 호중구의 세포사멸이 지연된다는 것을 제시하는 것으로 apoA-I이 호중구에 대하여 염증성 인자로 작용할 것으로 추정된다.

Keywords

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