The roles of PKC-δ on the regulation of insulin-like growth factor(IGF)-I and insulin-Like growth factor binding protein-3 secretion by all-trans retinoic acid in MCF-7 cell

MCF-7 cell에서 all-trans retinoic acid에 의한 insulin-like growth factor-I와 insulin-like growth factor binding protein-3 분비조절에 있어서 PKC-δ의 역할

  • Lee, Sun-Mi (Bio-safety Research Institute, College of Veterinary Medicine, Chonbuk National University) ;
  • Kim, Sang-Hoon (Bio-safety Research Institute, College of Veterinary Medicine, Chonbuk National University) ;
  • Choi, Kwang-Soo (Department of Animal Resources Science, Woosuk University) ;
  • Kang, Chang-Won (Bio-safety Research Institute, College of Veterinary Medicine, Chonbuk National University)
  • 이선미 (전북대학교 수의과대학 생체안전성연구소) ;
  • 김상훈 (전북대학교 수의과대학 생체안전성연구소) ;
  • 최광수 (우석대학교 동물자원학과) ;
  • 강창원 (전북대학교 수의과대학 생체안전성연구소)
  • Accepted : 2006.05.09
  • Published : 2006.06.30

Abstract

All-trans retinoic acid (AtRA) induces growth inhibition and apoptosis in a variety of tumer cells, including MCF-7 cells. Insulin-like growth factors (IGFs) system has been reported to be associated with the development of cancer. Although MCF-7 cell with AtRA is to be the major stimulus for the cell growth and apoptosis, the mechanism of insulin-like growth factor-I (IGF-I)/insulin-like growth factor binding protein-3 (IGFBP-3) system remains to be elucidated. Thus, this study was conducted to the effect of AtRA on the gene expression and level of IGF-I and IGFBP-3. In addition, we investigated the involvement of PKC-${\delta}$ on the IGF-I and IGFBP-3 secretion in MCF-7 cell. AtRA(${\geq}10^{-7}M$) decreased the IGF-1 secretion and mRNA expressions, but increased IGFBP-3 secretion and mRNA expressions in MCF-7 cells. Especially, the treatment of AtRA at 72 hours caused a significant reduction in the IGF-I secretion and mRNA expressions but increment in IGFBP-3 secretion and mRNA expressions (p < 0.05). $10^{-7}M$ AtRA activated PKC-${\delta}$ that is one among PKC-$\iota$, ${\alpha}$, ${\lambda}$ and ${\delta}$ in MCF-7 cell. Rotllerin, a PKC-${\delta}$ inhibitor, blocked AtRA-induced inhibition of the IGF-I and mRNA expressions, and increase of lGFBP-3 and mRNA expressions in MCF-7 cell. Together, AtRA inhibited the IGF-I secretion and mRNA expressions, but increased IGFBP-3 secretion and mRNA expressions in MCF-7 cell. Furthermore, AtRA-induced alteration of IGF-I, IGFBP-3 secretion, and the gene expressions were mediated via PKC-${\delta}$ activity.

Keywords

References

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