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Article

Effects of gambogic acid on the activation of caspase-3 and downregulation of SIRT1 in RPMI-8226 multiple myeloma cells via the accumulation of ROS

  • Authors:
    • Li-Jing Yang
    • Yan Chen
    • Jing He
    • Sha Yi
    • Lu Wen
    • Shuai Zhao
    • Guo-Hui Cui
  • View Affiliations / Copyright

    Affiliations: Department of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
  • Pages: 1159-1165
    |
    Published online on: March 6, 2012
       https://doi.org/10.3892/ol.2012.634
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Abstract

Multiple myeloma (MM) is the second most commonly diagnosed hematologic malignancy. Although new drugs, including bortezomib and lenalidomide, have improved the treatment landscape for MM patients, MM remains incurable. Therefore, screening for novel anti-myeloma drugs is necessary. Gambogic acid (GA), the main active ingredient of gamboges secreted from the Garcinia hanburryi tree, has been reported to exhibit potent anticancer activity in certain solid tumors and hematological malignancies, while there are few studies that are available concerning its effects on MM cells. In the present study, we investigated the anticancer activity of GA on the MM RPMI-8226 cells and further studied the underlying mechanisms by which GA affected the cells. RPMI-8226 cells were cultured and the effect of GA on cell proliferation was analyzed using MTT assay. Hoechst 33258 staining was used to visualize nuclear fragmentation, and reactive oxygen species (ROS) levels were detected. GA was found to have a significant, dose-dependent effect on growth inhibition and apoptosis induction in RPMI-8226 cells. This activity is associated with the accumulation of ROS, which contributes to the activation of caspase-3 and the cleavage of poly (ADP-ribose) polymerase (PARP), accompanied with apoptosis in RPMI-8226 cells treated with GA. Mammalian SIRT1, as the closest homolog of the yeast Sir2, was extensively involved in regulating cell processes, including cell senescence, aging and neuronal protection, as well as having anti-apoptotic properties. Moreover, SIRT1 overexpression has been shown to protect cancer cells from chemotherapy and ionizing radiation. In the present study, we demonstrated that GA has the potential to downregulate the expression of SIRT1 via ROS accumulation. In conclusion, our study found that GA is able to induce apoptosis in RPMI‑8226 cells via ROS accumulation followed by caspase-3 activation, PARP cleavage and SIRT1 downregulation. These results suggest that GA may have the potential to not only induce apoptosis in MM cells, but also to decrease the relapse rate of MM.
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Copy and paste a formatted citation
Spandidos Publications style
Yang L, Chen Y, He J, Yi S, Wen L, Zhao S and Cui G: Effects of gambogic acid on the activation of caspase-3 and downregulation of SIRT1 in RPMI-8226 multiple myeloma cells via the accumulation of ROS. Oncol Lett 3: 1159-1165, 2012.
APA
Yang, L., Chen, Y., He, J., Yi, S., Wen, L., Zhao, S., & Cui, G. (2012). Effects of gambogic acid on the activation of caspase-3 and downregulation of SIRT1 in RPMI-8226 multiple myeloma cells via the accumulation of ROS. Oncology Letters, 3, 1159-1165. https://doi.org/10.3892/ol.2012.634
MLA
Yang, L., Chen, Y., He, J., Yi, S., Wen, L., Zhao, S., Cui, G."Effects of gambogic acid on the activation of caspase-3 and downregulation of SIRT1 in RPMI-8226 multiple myeloma cells via the accumulation of ROS". Oncology Letters 3.5 (2012): 1159-1165.
Chicago
Yang, L., Chen, Y., He, J., Yi, S., Wen, L., Zhao, S., Cui, G."Effects of gambogic acid on the activation of caspase-3 and downregulation of SIRT1 in RPMI-8226 multiple myeloma cells via the accumulation of ROS". Oncology Letters 3, no. 5 (2012): 1159-1165. https://doi.org/10.3892/ol.2012.634
Copy and paste a formatted citation
x
Spandidos Publications style
Yang L, Chen Y, He J, Yi S, Wen L, Zhao S and Cui G: Effects of gambogic acid on the activation of caspase-3 and downregulation of SIRT1 in RPMI-8226 multiple myeloma cells via the accumulation of ROS. Oncol Lett 3: 1159-1165, 2012.
APA
Yang, L., Chen, Y., He, J., Yi, S., Wen, L., Zhao, S., & Cui, G. (2012). Effects of gambogic acid on the activation of caspase-3 and downregulation of SIRT1 in RPMI-8226 multiple myeloma cells via the accumulation of ROS. Oncology Letters, 3, 1159-1165. https://doi.org/10.3892/ol.2012.634
MLA
Yang, L., Chen, Y., He, J., Yi, S., Wen, L., Zhao, S., Cui, G."Effects of gambogic acid on the activation of caspase-3 and downregulation of SIRT1 in RPMI-8226 multiple myeloma cells via the accumulation of ROS". Oncology Letters 3.5 (2012): 1159-1165.
Chicago
Yang, L., Chen, Y., He, J., Yi, S., Wen, L., Zhao, S., Cui, G."Effects of gambogic acid on the activation of caspase-3 and downregulation of SIRT1 in RPMI-8226 multiple myeloma cells via the accumulation of ROS". Oncology Letters 3, no. 5 (2012): 1159-1165. https://doi.org/10.3892/ol.2012.634
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