Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Up-regulation of CD11c Expression on Human Acute Myelogenous Leukemia Cells by Flt-3 Ligand

인간 골수성 백혈병 세포에서 Flt-3 수용체 리간드에 의한 CD11c 발현의 증가

  • Xu, Qi (Department of Immunology, Xinjiang Medical University) ;
  • Kwak, Jong-Young (Department of Biochemistry, School of Medicine, Dong-A University)
  • Published : 2009.12.30
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Abstract

CD11c and costimulatory molecules such as CD80 and CD86 express mainly in dendritic cells (DCs). In this study, we investigated the biologic effects of recombinant Fms-like tyrosine kinase-3 (Flt-3) ligand on the expression of DC surface markers, including CD11c in leukemia cell lines, such as KG-1, HL-60, NB4, and THP-1 cells. The expression of the Flt-3 receptor was found in NB4 and HL-60 cells, as well as KG-1 cells, but not in THP-1 cells. When KG-1 cells were cultured in a medium containing Flt-3 ligand or granulocyte macrophage-colony stimulating factor (GM-CSF) plus tumor necrosis factor (TNF)-$\alpha$, cell proliferation was inhibited and the expression levels of CD11c, major histocompatibility complex (MHC)-I, and MHC-II were increased in the cells. Flt-3 ligand also increased the expression level of CD11c on HL-60 and NB4 cells, but not on THP-1 cells. In comparison with CD11c expression, the expression level of CD11b on KG-1 cells, but not on NB4 and HL-60 cells, was slightly increased by Flt-3 ligand. Flt-3 ligand induced phosphorylation of extracellular signal-regulated kinase-1/2 (ERK-1/2) and p38-mitogen-activated protein kinase (p38-MAPK) in KG-1 cells, and the up-regulation of CD11c expression by Flt-3 ligand in the cells was abrogated by PD98059, an inhibitor of MEK. The results suggest that Flt-3 ligand up-regulates DC surface markers on $CD34^+$ myelomonocytic KG-1 cells, as well as promyelocytic leukemia cells, and that the differentiation of the leukemia cells into DC-like cells by Flt-3 ligand is mediated by ERK-1/2 activity.

CD11c와 CD80 및 CD86과 같은 보조 수용체는 주로 수지상 세포에서 발현되는 세포 표지 인자이다. 본 연구에서는 KG-1, HL-60, NB4 및 THP-1 세포와 같은 여러 종류의 백혈병 세포를 이용하여 이들 세포에 재조합 Flt-3 리간드를 처리하였을 때 수지상 세포의 표면 인자인 CD11c의 발현에 어떠한 변화가 있는가를 조사하였다. KG-1 세포뿐만 아니라 NB4세포와 HL-60 세포에서도 Flt-3 수용체가 발현됨을 확인하였으나 THP-1 세포에서는 이들 수용체가 발현되지 않았다. KG-1 세포를 Flt-3 리간드나 granulocyte macrophage-colony stimulating factor (GM-CSF)와 tumor necrosis factor (TNF)-$\alpha$를 섞은 배양액에서 배양하였을 때 세포 증식은 억제되었으며 CD11c 발현은 현저히 증가되었다. 그러나 Flt-3 리간드를 처리한 KG-1세포에서는 GM-CSF와 TNF-$\alpha$를 처리한 세포에서와는 다르게 major histocompatibility complex (MHC)-I 및 MHC-II의 발현은 증가되지 않았다. Flt-3 리간드는 HL-60 세포와 NB4 세포의 CD11c 발현도 증가시켰으나 THP-1 세포에서는 아무런 영향이 없었다. CD11c의 발현과 비교하여 CD11b의 발현은 Flt-3 리간드에 의하여 KG-1 세포에서는 약하게 증가하였으나 NB4 세포와 HL-60 세포에서는 증가되지 않았다. KG-1 세포를 Flt-3 리간드로 처리하였을 때 extracellular signal-regulated kinase-1/2 (ERK-1/2)와 p38-mitogen-activated protein kinase (p38-MAPK)의 단백질 인산화가 증가되었으며 Flt-3 리간드에 의한 CD11c 발현의 증가는 MEK의 억제제인PD98059에 의하여 사라짐을 확인하였다. 본 연구 결과는 Flt-3 수용체 리간드의 처리에 의하여 $CD34^+$ myelomonocyte분화 단계인 KG-1 세포와 promyelocyte 분화 단계의 백혈병 세포에서 수지상 세포와 유사한 세포 형으로 분화된다는 것을 보였고 Flt-3 수용체 리간드에 의한 이들 백혈병 세포의 수지상 세포유사 세포로의 분화는 ERK-1/2의 활성화에 의하여 일어날 수 있음을 보여 준다.

Keywords

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