생명과학회지 (Journal of Life Science)

  • 제13권5호
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  • Pages.642-650
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  • 2003
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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 신경아세포종에서 cAMP 처리에 의한 pRB의 인산화 억제 및 p21WAF1/CIP1의 유도

Inhibition of pRB Phosphorylation and Induction of p21WAF1/CIP1 Occur During cAMP-induced Growth Arrest in Human Neuroblastoma Cells

  • Park, Yung-Hyun (Department of Biochemistry, Dong-Eui University College of Oriental Medicine and Research Institute of Oriental Medicine) ;
  • Lee, Sang-Hyeon (Department of Bioscience & Biotechnology, Silla University)
  • 발행 : 2003.10.01
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초록

인체 신경아세포종의 성장에 미치는 cAMP의 영향을 조사하기 위하여 Ewing's sarcoma 세포주인 CHP-100 세포에 dibutyry1-cAMP 및 8-bromo-cAMP를 처리하였다. 두 종류의 cAMP analog처리 시간 증가에 따라 CHP-100 세포의 증식이 처리 시간 의존적으로 억제되었으며, 이는 핵의 형태변화 및 DNA 단편화 현상을 수반한 apoptosis 유발과 연관성이 있었다. 또한 DNA flow cytometry 분석결과 cAMP는 세포주기 G1기 특이적 arrest를 유발하였다. cAMP 처리에 의하여 retinoblastoma 단백질(pRB)의 인산화가 억제되었으며, 전사조절인자 E2F-1과의 결합이 증대되었다. cAMP는 cyclin-dependent kinase (Cdk) 2 및 cyclin E 단백질의 발현변화에는 영향을 미치지 않았으나, 그들의 kinase 활성은 처리시간 의존적으로 매우 감소되었다. 또한 cAMP 처리에 의하여 Cdk inhibitor인 $p21^{WAF1/CIP1$의 발현이 증가되었으며, 증가된 p21 단백질은 Cdk2와 강한 결합을 형성하고 있었다. 이상의 결과에서 cAMP의 암세포 성장억제 효과에 pRB 및 p21이 매우 중요한 역할을 함을 알 수 있었다.

To develop a new approach to the treatment of neuroblastoma cells we evaluated the effect of cAMP on the Ewing's sarcoma cell line CHP-100. We observed that the proliferation-inhibitory effect of cAMP analogs was due to cell cycle arrest and induction of apoptosis, which was confirmed by observing the morphological changes and DNA fragmentation. DNA flow cytometric analysis revealed that cAMP arrested the cell cycle progression at the G1 phase, which effects were associated with inhibition of phosphorylation of retinoblastoma protein (pRB) and enhanced binding of pRB and the transcription factor E2F-1. cAMP also suppressed the cyclin-dependent kinase (Cdk) 2 and cyclin E-associated kinase activity without changes of their expressions. Furthermore, cAMP induced the levels of Cdk inhibitor $p21^{WAF1/CIP1$ expression and p21 proteins induced by cAMP were associated with Cdk2. Overall, our results identify a combined mechanism involving the inhibition of pRB phosphorylation and induction of p21 as targets for cAMP, and this may explain some of its anti-cancer effects.

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