Asian Pacific Journal of Cancer Prevention

Asian Pacific Journal of Cancer Prevention (아시아태평양암예방학회)
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Effects of Parafibromin Expression on the Phenotypes and Relevant Mechanisms in the DLD-1 Colon Carcinoma Cell Line

  • Zhao, Shuang (Cancer Research Center, The First Affiliated Hospital of Liaoning Medical University) ;
  • Sun, Hong-Zhi (Cancer Research Center, The First Affiliated Hospital of Liaoning Medical University) ;
  • Zhu, Shi-Tu (Cancer Research Center, The First Affiliated Hospital of Liaoning Medical University) ;
  • Lu, Hang (Cancer Research Center, The First Affiliated Hospital of Liaoning Medical University) ;
  • Niu, Zhe-Feng (Cancer Research Center, The First Affiliated Hospital of Liaoning Medical University) ;
  • Guo, Wen-Feng (Cancer Research Center, The First Affiliated Hospital of Liaoning Medical University) ;
  • Takano, Yasuo (Clinical Research Institute, Kanagawa Cancer Center) ;
  • Zheng, Hua-Chuan (Cancer Research Center, The First Affiliated Hospital of Liaoning Medical University)
  • Published : 2013.07.30
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Abstract

Background: Parafibromin is a protein encoded by the HRPT2 (hyperparathyroidism 2) oncosuppressor gene and its down-regulated expression is involved in pathogenesis of parathyroid, breast, gastric and colorectal carcinomas. This study aimed to clarify the effects of parafibromin expression on the phenotypes and relevant mechanisms of DLD-1 colon carcinoma cells. Methods: DLD-1 cells transfected with a parafibromin-expressing plasmid were subjected to examination of phenotype, including proliferation, differentiation, apoptosis, migration and invasion. Phenotype-related proteins were measured by Western blot. Parafibromin and ki-67 expression was detected by immunohistochemistry on tissue microarrays. Results: The transfectants showed higher proliferation by CCK-8, better differentiation by electron microscopy and ALP activity and more apoptotic resistance to cisplatin by DNA fragmentation than controls. There was no difference in early apoptosis by annexin V, capase-3 activity, migration and invasion between DLD-1 cells and their transfectants. Ectopic parafibromin expression resulted in down-regulated expression of smad4, MEKK, GRP94, GRP78, $GSK3{\beta}$-ser9, and Caspase-9. However, no difference was detectable in caspase-12 and -8 expression. A positive relationship was noted between parafibromin and ki-67 expression in colorectal carcinoma. Conclusions: Parafibromin overexpression could promote cell proliferation, apoptotic resistance, and differentiation of DLD-1 cells.

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References

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