Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Inhibition of ERK1/2 Activation and Cytoskeleton Rearrangement by the Recombinant Protein of Plasminogen Kringle 5

Plasminogen kringle 5 재조합 단백질에 의한 ERK1/2 활성화 및 세포골격 재배열 억제

  • Ha, Jung-Min (Cancer Research Institute and Department of Biomedical Sciences College of Medicine, The Catholic University of Korea) ;
  • Kim, Hyun-Kyung (Cancer Research Institute and Department of Biomedical Sciences College of Medicine, The Catholic University of Korea) ;
  • Kim, Myoung-Rae (Cancer Research Institute and Department of Biomedical Sciences College of Medicine, The Catholic University of Korea) ;
  • Joe, Young-Ae (Cancer Research Institute and Department of Biomedical Sciences College of Medicine, The Catholic University of Korea)
  • 하정민 (가톨릭대학교 의과대학 생명의과학과, 암연구소) ;
  • 김현경 (가톨릭대학교 의과대학 생명의과학과, 암연구소) ;
  • 김명래 (가톨릭대학교 의과대학 생명의과학과, 암연구소) ;
  • 조영애 (가톨릭대학교 의과대학 생명의과학과, 암연구소)
  • Published : 2006.12.01
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Abstract

Plasminogen kringle 5 is a potent inhibitor of endothelial tell proliferation like an endogenous angiogenesis inhibitor, angiostatin consisting of plasminogen kringles 1-4. In this study, we produced the recombinant protein of plasminogen kringle 5 (PK5) employing an Pichia expression system and examined its. effect on~endothelial cell migration and its possible inhibitory mechanism. PK5 was expressed in Pichia pastoris GS115 by fusion of the cDNA spanning from Thr456 to Phe546 to the secretion signal sequence of a-factor prepro-peptide. After methanol induction, the secreted PK5 was purified by using S-spin column. SDS-PACE analysis of the purified protein showed one major band of approximately 10kDa. In in vitro migration assays, the purified protein inhibited dose-dependently the migration of human umbilical endothelial cells (HUVECs) induced by basic fibroblast growth factor (bFGF) or vascular endothelial growth factor (VEGF) with an $IC_{50}$ of approximately 500nM. Accordingly, it inhibited bfGF-stimulated extracellular signal-regulated kinase 1/2 (ERK1/2) phosphorylation in HUVECs at 500nM. In addition, it also potently inhibited bFGF-induced cytoskeletal rearrangement of HUVECs. Thus, these results suggest that Pichia-produced PK5 effectively inhibits endothelial cell migration, in part by suppression of ERK1/2 activation and blocking cytoskeleton rearrangement.

Plasminogen kringle 5는 plasminogen kringles 1-4로 구성된 내생의 혈관 신생 억제제인 angiostatin과 같이 내피세포의 분열을 강력하게 억제한다고 알려져 있다. 본 연구에서는 plasminogen kringle 5의 재조합 단백질을 효모 발현 체계에서 생산하여 내피세포의 이동에 대한 저해 효과와 이에 대한 작용기전을 조사하였다 재조합 단백질 PK5는 plasminogen의 Thr456에서 Phe546까지 이르는 cDNA 부분을 ${\alpha}-factor$ prepro-peptide의 분비 신호 서열 뒤에 도입하여 Pichia pastoris GS115에서 발현시켰다. 메탄올 유도 후 얻은 배양액을 S-spin column을 이용하여 정제하였다. 정제된 단백질을 SDS-PACE하였을 때 약 10kDa의 단일 밴드를 나타냄을 확인할 수 있었다. 정제된 PK5는 bFGF나 VEGF에 의해 유도된 인간의 제대 유래 내피 세포의 이동을 약 500nM의 $IC_{50}$ 값으로 농도 의존적으로 감소시켰다. 내피 세포에 PK5 500M을 처리한 결과 bFGF에 의해 유도된 ERK1/2의 인산화를 감소시켰다 또한, PK5는 bFGF에 의해 유도된 내피세포의 골격 재형성을 강력하게 억제하는 것으로 관찰되었다. 따라서, 이러한 결과들은 효모 생산 PK5가 내피세포의 이동을 효과적으로 억제하며, 이는 ERK1/2의 활성과 세포골격의 재배열을 억제함으로써 나타나는 것으로 부분적으로 설명될 수 있다.

Keywords

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