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Oxymatrine induces mitochondria dependent apoptosis in human osteosarcoma MNNG/HOS cells through inhibition of PI3K/Akt pathway

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Tumor Biology

Abstract

The cytostatic drug from traditional Chinese medicinal herb has acted as a chemotherapeutic agent used in treatment of a wide variety of cancers. Oxymatrine, classified as a quinolizidine alkaloid, is a phytochemical product derived from Sophora flavescens, and has been reported to possess anticancer activities. However, the cancer growth inhibitory effects and molecular mechanisms in human osteosarcoma MNNG/HOS cell have not been well studied. In the present study, the cytotoxic effects of oxymatrine on MNNG/HOS cells were examined by MTT and bromodeoxyuridine (BrdU) incorporation assays. The percentage of apoptotic cells and the level of mitochondrial membrane potential (Δψ m) were assayed by flow cytometry. The levels of apoptosis-related proteins were measured by Western blot analysis or enzyme assay Kit. Our results showed that treatment with oxymatrine resulted in a significant inhibition of cell proliferation and DNA synthesis in a dose-dependent manner, which has been attributed to apoptosis. Furthermore, we found that oxymatrine considerably inhibited the expression of Bcl-2 whilst increasing that of Bax. This promoted mitochondrial dysfunction, leading to the release of cytochrome c from the mitochondria to the cytoplasm, as well as the activation of caspase-9 and -3. Moreover, addition of oxymatrine to MNNG/HOS cells also attenuated phosphatidylinositol 3-kinase (PI3K) ⁄Akt signaling pathway cascade, evidenced by the dephosphorylation of P13K and Akt. Likewise, oxymatrine significantly suppressed tumor growth in female BALB/C nude mice bearing MNNG/HOS xenograft tumors. In addition, no evidence of drug-related toxicity was identified in the treated animals by comparing the body weight increase and mortality. Therefore, these findings should be useful for understanding the apoptotic cellular mechanism mediated by oxymatrine and might offer a therapeutic potential advantage for human osteosarcoma chemoprevention or chemotherapy.

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Authors and Affiliations

  1. Institute of Osteosarcoma, Tangdu Hospital of the Fourth Military Medical University, 1 Xinsi Road, Xi’an, Shaanxi, 710038, China

    Yong Zhang, Siguo Sun, Jun Chen, Pengcheng Ren, Yunsheng Hu, Zhuo Cao, Honghui Sun & Yong Ding

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  1. Yong Zhang
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  2. Siguo Sun
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  3. Jun Chen
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  4. Pengcheng Ren
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  5. Yunsheng Hu
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  6. Zhuo Cao
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  7. Honghui Sun
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Correspondence to Honghui Sun or Yong Ding.

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Y. Zhang and S. Sun contributed equally to this work.

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Zhang, Y., Sun, S., Chen, J. et al. Oxymatrine induces mitochondria dependent apoptosis in human osteosarcoma MNNG/HOS cells through inhibition of PI3K/Akt pathway. Tumor Biol. 35, 1619–1625 (2014). https://doi.org/10.1007/s13277-013-1223-z

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  • DOI: https://doi.org/10.1007/s13277-013-1223-z

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