Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Inhibitory Effect of LPS-Induced Plasminogen Activator Inhibitor-1 by Ascofuranone in Rat Kidney Fibroblast Cells

Ascofuranone에 의한 plasminogen activator inhibitor-1 발현저해 효과

  • Chang, Young-Chae (Department of Pathology, Catholic University of Daegu School of Medicine)
  • 장영채 (대구가톨릭대학교 의과대학 병리학교실)
  • Published : 2009.10.30
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Abstract

Renal fibrosis is a final common manifestation of every type of chronic kidney disease. Plasminogen activator inhibitor (PAI)-1 is induced by lipopolysaccharide (LPS) and is known to play an essential role in the progress of renal fibrosis. In this paper, we found that an isoprenoid antibiotic, ascofuranone (AF), suppresses expression of profibrotic factors, PAI-1 and promoter activity of PAI-1 induced by LPS in rat kidney fibroblast cells. We therefore investigated signaling pathway mediated inhibitory effects of LPS-induced PAI-1 by AF in rNRK-49F cells. PAI-1 expression is suppressed by treatment with kinase inhibitors for MEK-1/2, as it isin inhibition of PAI-1 expression by AF, and AF inhibits phosphorylation of ERK-1/2. This study suggest that AF suppresses expression of PAI-1 through the inhibition of an ERK-1/2-dependent signal transduction pathway. The data indicates the possibility that AF can be used to prevent the development and progression of renal fibrosis.

이 연구는 신장섬유아 세포를 이용하여 LPS에 의해 유도된 신장섬유화 표적유전자인 plasminogen activator inhibitor (PAI-1) 발현과 Ascofuranone (AF)에 의한 신장섬유화 저해효과를 연구하였다. 이 연구를 통해 LPS가 PAI-1의 발현을 농도 및 시간 의존적으로 증가시켜 LPS가 신장섬유화 유도물질임을 확인 할 수 있었다. 또한 LPS로 유도된 PAI-1 mRNA 및 단백질 발현 레벨이 AF에 의해 저해되었으며, 신장섬유화의 또 다른 대표유전자인 fibronectin의 단백질 발현도 AF에 의해 억제되어 AF가 신장섬유화를 저해하는 사실을 확인할 수 있었다. 그리고 AF에 대한 PAI-1 프로모터 활성을 조사하기 위하여 p800-PAI-1-luc을 신장섬유아 세포에 형질전환 시킨 결과, AF가 PAI-1의 전사 활성 조절을 통해 발현을 억제한다는 것을 확인하였다. ERK-1/2의 상위에 존재하는 MEK inhibitor를 처리하여 PAI-1의 발현을 확인한 결과에서도 AF를 처리한 경우와 동일하게 PAI-1 발현이 저해되어 LPS로 유도된 PAI-1의 발현이 ERK-1/2에 의해 조절됨을 알 수 있었다. 또한 LPS로 유도된 ERK-1/2의 인산화가 AF 농도의존적으로 저해된 결과는, AF가 ERK-1/2의 활성저해를 통하여 PAI-1 발현을 조절한다는 사실을 확인 할 수 있었다. 따라서 이러한 연구결과 AF가 신장섬유화를 저해하는 유력한 후보물질로서의 가능성을 제시하였다.

Keywords

References

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