Contribution of caspase-independent pathway to apoptosis in malignant glioma induced by carbon ion beams

  • Authors:
    • Luwei Zhang
    • Jiawei Yan
    • Yang Liu
    • Qiuyue Zhao
    • Cuixia Di
    • Sun Chao
    • Li Jie
    • Yuanyuan Liu
    • Hong Zhang
  • View Affiliations

  • Published online on: March 24, 2017     https://doi.org/10.3892/or.2017.5529
  • Pages: 2994-3000
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Abstract

High linear energy transfer (LET) carbon ion beam (CIB) is becoming the best tool for external radiotherapy of inoperable tumors because of its greater cell killing than conventional low LET gamma or X-rays. In the present study, whether the caspase-independent pathway exerts the important contribution in CIB-induced cell apoptosis was explored. Herein we showed, despite the absence of caspase activity using a pan caspase inhibitor Z-VAD-FMK, that apoptosis induced by high LET CIB were clearly observed in the glioma cells. Simultaneously, the increased 8-OHdG level, PARP-1 activity and AIF translocation occurred in response to CIB irradiation. Moreover, it was distinctly higher in the nuclear translocation frequency along with PARP-1 activation when the caspase protease cascade was suppressed in the irradiated glioma cells. Nuclear colocalization between PARP-1 and AIF as well as a positive association of the PARP-1 mRNA expression with AIF translocation frequency indicated that PARP-1 activation controlled the translocation of AIF to the nucleus. Our findings strongly demonstrated that caspase-independent cell apoptosis provided a prominent compensation in the glioma cell death involving the PARP-1/AIF signaling pathway at 24 h after CIB exposure, and likely triggered by oxidative damage to DNA. The knowledge on the molecular mechanism of AIF-mediated cell death may be very useful for the improvement of the therapeutic efficacy of malignant gliomas with heavy charged particles.
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May-2017
Volume 37 Issue 5

Print ISSN: 1021-335X
Online ISSN:1791-2431

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Spandidos Publications style
Zhang L, Yan J, Liu Y, Zhao Q, Di C, Chao S, Jie L, Liu Y and Zhang H: Contribution of caspase-independent pathway to apoptosis in malignant glioma induced by carbon ion beams. Oncol Rep 37: 2994-3000, 2017.
APA
Zhang, L., Yan, J., Liu, Y., Zhao, Q., Di, C., Chao, S. ... Zhang, H. (2017). Contribution of caspase-independent pathway to apoptosis in malignant glioma induced by carbon ion beams. Oncology Reports, 37, 2994-3000. https://doi.org/10.3892/or.2017.5529
MLA
Zhang, L., Yan, J., Liu, Y., Zhao, Q., Di, C., Chao, S., Jie, L., Liu, Y., Zhang, H."Contribution of caspase-independent pathway to apoptosis in malignant glioma induced by carbon ion beams". Oncology Reports 37.5 (2017): 2994-3000.
Chicago
Zhang, L., Yan, J., Liu, Y., Zhao, Q., Di, C., Chao, S., Jie, L., Liu, Y., Zhang, H."Contribution of caspase-independent pathway to apoptosis in malignant glioma induced by carbon ion beams". Oncology Reports 37, no. 5 (2017): 2994-3000. https://doi.org/10.3892/or.2017.5529