Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Effect of Various Factors on Early THP-1 Cell Adhesion Induced Phorbol 12-Myristate 13-Acetate (PMA)

Phorbol 12-myristate 13-acetate (PMA) 처리로 유도되는 THP-1 세포의 초기 부착에 관한 다양한 인자의 효과

  • Jo, Yong-Sam (Department of Microbiology, College of Medicine, Dankook University) ;
  • Shin, Ji-Hyun (Department of Microbiology, College of Medicine, Dankook University) ;
  • Choi, Tae-Saeng (Department of Microbiology, College of Medicine, Dankook University)
  • 조용삼 (단국대학교 의과대학교 미생물학교실) ;
  • 신지현 (단국대학교 의과대학교 미생물학교실) ;
  • 최태생 (단국대학교 의과대학교 미생물학교실)
  • Published : 2008.07.30
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Abstract

We evaluated the effects of various factors (e.g., serum, inhibitors of protein synthesis, and cytoskeleton and protein kinases) on early PMA-induced THP-1 cell adhesion using an adhesion assay with Sulforhodamine B (SRB) staining, which was used to assess the proliferation of the attached cells. THP-1 cell adhesion to a plastic substrate was detected 1 hr after exposure to Phorbol 12-Myristate 13-Acetate (PMA) and peaked after 18 hr. At concentrations > 25 nM PMA, the level of adhesion did not change. Based on our preliminary results, we used 25 nM PMA and 5 hr of culture as standard assay conditions. Early PMA-induced cell adhesion was not affected by the presence of serum or PD 98059 in the culture medium, but was affected by the addition of PKC inhibitors and cycloheximide. In the presence of actin inhibitor with PMA, the cell adhesion increased when comparing with PMA treatment only. Thus, early PMA-induced adhesion of THP-1 cells does not require serum in the culture medium, MAP-kinase activation, or actin polymerization, but does require de novo protein synthesis and PKC activation. Our SRB-based cell adhesion assay may be used to screen other PKC inhibitors.

본 실험에서는 THP-1 세포의 PMA에 의하여 유도되는 초기 세포부착에 관한 메카니즘을 이해하기 위하여 다양한 요인(혈청, 신규 단백질의 합성, 세포 골격 저해제, 단백질 인신화 저해제)들의 효과를 조사하였다. 또한 본 실험에서는 이들 세포부착의 정도를 일반적으로 세포증식 분석에 사용되고 있는 SRB염색법을 도입하여 세포부착 분석에 간편한 방법의 조건을 확립하였다. PMA에 의한 초기 세포부착에는 배양액중의 혈청의 유무는 영향이 없었으나, 신규 단백질의 합성이 요구되는 것을 확인하였다. 또한 이들 초기 세포부착에 PMA처리에 의한 PKC의 활성화는 필수적이나, 그 하류 활성화 인자로 잘 알려진 MAP-kinase (erk1/2)의 인산화는 필요치 않음을 알 수 있었다. 흥미롭게도 액틴 중합 저해제인 cytochalasin D의 PMA와 공 처리는 오히려 세포부착을 PMA 단독 처리시 보다 증가시켰다. 또한 본 실험에서 사용된 SRB 염색법을 통한 세포부착 분석법은 최근 암 등 다양한 질환의 신약 표적 분자로 주목을 받고 있는 PKC 저해제의 초기 세포 기반 분석에 매우 유용하리라고 생각된다.

Keywords

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