Asian Pacific Journal of Cancer Prevention

Asian Pacific Journal of Cancer Prevention (아시아태평양암예방학회)
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Effects of Arsenic Trioxide Alone and in Combination with Bortezomib in Multiple Myeloma RPMI 8266 Cells

  • Elmahi, Aadil Yousif (Cancer Center, the First Hospital of Jilin University) ;
  • Niu, Chao (Cancer Center, the First Hospital of Jilin University) ;
  • Li, Wei (Cancer Center, the First Hospital of Jilin University) ;
  • Li, Dan (Cancer Center, the First Hospital of Jilin University) ;
  • Wang, Guan-Jun (Cancer Center, the First Hospital of Jilin University) ;
  • Hao, Shan-Shan (Cancer Center, the First Hospital of Jilin University) ;
  • Cui, Jiu-Wei (Cancer Center, the First Hospital of Jilin University)
  • Published : 2013.11.30
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Abstract

The aim of this study was to detect the efficiency of arsenic trioxide (ATO) alone or together with bortezomib to inhibit proliferation and induce apoptosis in a multiple myeloma (MM) RPMI 8266 cells. Mechanisms of action were also investigated. RPMI 8266 cells were treated with ATO alone and in combination with bortezomib for 24 hours, and cell viability was assessed by modified MTT. Annexin V-F1TC and PI staining was used to detect the apoptosis rate and cell cycling was investigated by flow cytometry, along with expression of cell surface death receptor-4(DR4) and death receptor-5 (DR5). Western blotting was applied to detect the expression of bcl-2, caspase-3, caspase-8, and caspase-9. As a result, the ATO combined with bortezomib group showed more inhibition of RPMI 8266 cell viability than theATO group. Expression of DR4 and DR5 on the cell surfaces, and the apoptosis rate were increased after treatment by ATO alone or combined with bortezomib. The cells appeared to arrest in G2/M phase after treatment. Expression of bcl-2 was more significantly decreased in the combination group, and that of caspase-3, caspase-8 and caspase-9 was significantly increased as well. Therefore, bortezomib can enhance ATO actions to induce apoptosis in RPMI 8266 cells, with decrease in expression of bcl-2 and increase of caspase-3, caspase-8 and caspase-9 proteins.

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References

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