Asian Pacific Journal of Cancer Prevention

Asian Pacific Journal of Cancer Prevention (아시아태평양암예방학회)
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LY294002 Induces G0/G1 Cell Cycle Arrest and Apoptosis of Cancer Stem-like Cells from Human Osteosarcoma Via Down-regulation of PI3K Activity

  • Gong, Chen (Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology) ;
  • Liao, Hui (Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology) ;
  • Wang, Jiang (Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology) ;
  • Lin, Yang (Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology) ;
  • Qi, Jun (Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology) ;
  • Qin, Liang (Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology) ;
  • Tian, Lin-Qiang (Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology) ;
  • Guo, Feng-Jing (Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology)
  • Published : 2012.07.31
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Abstract

Osteosarcoma, the most common primary mesenchymal malignant tumor, usually has bad prognosis in man, with cancer stem-like cells (CSCs) considered to play a critical role in tumorigenesis and drug-resistance. It is known that phosphatidylinositol 3-kinase (PI3K) is involved in regulation of tumor cell fates, such as proliferation, cell cycling, survival and apoptosis. Whether and how PI3K and inhibitors might cooperate in human osteosarcoma CSCs is still unknown. We therefore evaluated the effects of LY294002, a PI3K inhibitor, on the cell cycle and apoptosis of osteosarcoma CSCs in vitro. LY294002 prevented phosphorylation of protein kinase B (PKB/Akt) by inhibition of PI3K phosphorylation activity, thereby inducing G0/G1 cell cycle arrest and apoptosis in osteosarcoma CSCs. Further studies also demonstrated that apoptosis induction by LY294002 is accompanied by activation of caspase-9, caspase-3 and PARP, which are involved in the mitochondrial apoptosis pathway. Therefore, our results indicate PI3K inhibitors may represent a potential strategy for managing human osteosarcoma via affecting CSCs.

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References

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