생명과학회지 (Journal of Life Science)

  • 제23권4호
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  • Pages.471-478
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  • 2013
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  • 1225-9918(pISSN)
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  • 2287-3406(eISSN)
한국생명과학회 (Korean Society of Life Science)
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인체 지방 유래 중간엽 줄기세포의 골분화 조절 기전에서 NFAT5의 역할

Role of NFAT5 in Osteogenic Differentiation of Human Adipose Tissue-Derived Mesenchymal Stem Cells

  • 이선영 (부산대학교 의학전문대학원 생리학교실) ;
  • 양지원 (부산대학교 의학전문대학원 생리학교실) ;
  • 정진섭 (부산대학교 의학전문대학원 생리학교실)
  • Lee, Sun Young (Department of Physiology, School of Medicine, Pusan National University) ;
  • Yang, Ji won (Department of Physiology, School of Medicine, Pusan National University) ;
  • Jung, Jin Sup (Department of Physiology, School of Medicine, Pusan National University)
  • 투고 : 2013.01.23
  • 심사 : 2013.04.17
  • 발행 : 2013.04.30
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초록

인체 중간엽 줄기세포는 다양한 세포로의 분화 및 자가증식 할 수 있는 능력뿐만 아니라 질병치료에 대한 치료적 잠재력을 가지고 있다. 줄기세포 분화의 분자 기작에 대한 이해는 줄기세포 이식의 치료 효능을 향상시킨다. 본 연구에는 인체 중간엽 줄기세포의 골분화에서 NFAT5의 역할을 밝혔다. 특이적 siRNA의 transfection으로 인한 NFAT5의 억제는 인체 중간엽 줄기세포의 골분화를 현저히 감소시켰으며, NF-${\kappa}B$ promoter 활성화 또한 세포의 증식이나 지방 세포로의 분화에 영향 없이 감소 시켰다. NFAT5의 발현 억제는 기본적으로 유도되는 NF-${\kappa}B$의 활성화와 TNF-${\alpha}$에 의해서 유도되는 NF-${\kappa}B$의 활성화를 감소시켰으나, TNF-${\alpha}$에 의해서 유도되는 NF-${\kappa}B$의 분해에는 아무런 영향을 주지 않았다. 이번 연구를 통해 NFAT5가 NF-${\kappa}B$ 경로를 조절함으로써 인체 중간엽 줄기 세포의 골분화에 아주 중요한 역할을 하는 것을 확인 할 수 있었다.

Human adipose tissue-derived mesenchymal stem cells (hADSCs) have therapeutic potential, including the ability to self-renew and differentiate into multiple lineages. Understanding of molecular mechanisms of stem cell differentiation is important for improving the therapeutic efficacies of stem cell transplantation. In this study, we determined the role of nuclear factor of activated T cells (NFAT5) in the osteogenic differentiation of hADSCs. The down-regulation of NFAT5 expression by the transfection of a specific siRNA significantly inhibited osteogenic differentiation of hADSCs and decreased the activity of the nuclear factor kappa-light-chain-enhancer of activated B cells (NF-${\kappa}B$) promoter without affecting their proliferation and adipogenic differentiation. The inhibition of NFAT5 expression inhibited the basal and Tumor Necrosis Factor ${\alpha}$ (TNF-${\alpha}$) induced activation of NF-${\kappa}B$, but it did not affect TNF-${\alpha}$-induced degradation of the $I{\kappa}B$ protein. These findings indicate that NFAT5 plays an important role in the osteogenic differentiation of hADSCs through the modulation of the NF-${\kappa}B$ pathway.

키워드

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