Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Effects of AEBSF on the Delay of Spontaneous Apoptosis and the Trans-Differentiation of Human Neutrophils into Dendritic Cells

Serine pretease 억제제인 4-(2-aminoethyl) benzensulfonylfluoride (AEBSF)에 의한 호중구의 자연 세포사멸의 지연과 수지상 세포로의 전이분화 연구

  • Park, Hae-Young (Medical Research Center for Cancer Molecular Therapy, Department of Biochemistry, School of Medicine, Dong-A University) ;
  • Kwak, Jong-Young (Medical Research Center for Cancer Molecular Therapy, Department of Biochemistry, School of Medicine, Dong-A University)
  • 박해영 (동아대학교 암분자치료연구센터, 의과대학 생화학교실) ;
  • 곽종영 (동아대학교 암분자치료연구센터, 의과대학 생화학교실)
  • Published : 2007.07.30
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Abstract

Neutrophils play a key role as a first line of defense and are known to acquire the characteristics of dendritic cells (DCs) under the appropriate conditions. The spontaneous apoptosis of neutrophils was delayed by treatment with 4-(2-aminoethyl) benzensulfonylfluoride (AEBSF), a serine protease inhibitor. AEBSF inhibited both caspase-3 and serine protease activities, whereas ZVAD-fmk, a pancaspase inhibitor, inhibited only caspase-3 activity. The life span of neutrophils was prolonged up to 5 days by AEBSF in the presence or absence of granulocyte macrophage colony stimulating factor(CM-CSF). DC surface markers, such as CD80, CD83, and MHC class ll were not expressed on neutrophils treated with AEBSF alone. CM-CSF failed to prolong the survival time of neutrophils up to3 days but increased the expression levels of DC markers on neutrophils in the presence of AEBSF. Expression levels of DC markers were the highest on neutrophils treated with CM-CSF and AEBSF for 3 days. AEBSF and CM-CSF-treated neutrophils stimulated proliferation of T cells in the presence of a superantigen, Staphylococcal enterotoxin B (SEB) but produced $interferon-{\gamma}$ ($IFN{\gamma}$) in the absence of SEB. These results suggest that the inhibition of serine protease activity prolonged the life span of human neutrophils and combined treatment of neukophils with CM-CSF and serine protease inhibitor induced differentiation of neutrophils into DC-like cells.

생체 면역반응에 중요한 역할을 하는 호중구의 세포사멸은 자연적으로 일어나거나 여러 외부자극에 의한 신호의 전달에 의해 증가하거나 지연된다. 또한 사이토카인과 같은 분화제에 의해 세포사멸이 지연되고 항원 제시 기능을 가진 수지상 세포로 분화되기도 한다. 본 연구에서는 세포사멸 억제제와 사이토카인을 이용한 시스템에서 호중구가 수지상 세포로 분화되는가를 조사하였다. Pancaspase와 serine protease의 억제제인 zVAD-fmk와 AEBSF를 처리하였을 때 호중구의 세포사멸은 현저히 감소되며 AEBSF는 caspase-3와 serine protease활성을 모두 억제하였다. 호중구의 세포사멸을 효과적으로 억제하는 AEBSF와 함께 분화제로 널리 쓰이는 CM-CSF를 같이 처리하여 3일 동안 배양하면 수지상 세포에서 높이 발현되는 CD8O, CD83 및 MHC class ll의 세포표면 마커의 발현이 증가하였다. AEBSF와 CM-CSF를 처리한 호중구를 T-세포와 함께 배양하였을 때 SEB가 존재할 경우 T-세포가 증식되었으며 SEB가 없이도 $IFN{\gamma}$는 생성되었다. 이들 결과들로 부터 serine protease 억제제인 AEBSF를 호중구에 처리하여 세포사멸을 효과적으로 억제하는 것과 수지상 세포로의 분화를 촉진하는 사이토카인인 CM-CSF의작용을 나타내게 하는 조건과는 서로 상호적으로 연관되어 작용할 수 있다는 것을 제시하고 있다.

Keywords

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