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Efficacy of pEgr‑1‑endostatin combined with ionizing radiation on hypoxic conditions in nude mice bearing SKOV3 ovarian carcinoma

  • Authors:
    • Yong‑Chun Zhang
    • Xiu‑Mei Li
    • Zhuang Yu
    • Xiao‑Li Shi
    • Yong Li
    • Wan‑Lin Wang
  • View Affiliations / Copyright

    Affiliations: Department of Oncology, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, P.R. China, Department of Ultrasound, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, P.R. China, Department of Gynecology, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, P.R. China
    Copyright: © Zhang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 1101-1108
    |
    Published online on: January 2, 2017
       https://doi.org/10.3892/ol.2017.5559
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Abstract

Hypoxia occurs in a wide range of solid tumors, and is strongly associated with radio‑resistance of malignant tumors. The aim of the present study was to investigate the effect of endostatin combined with ionizing radiation (IR) on hypoxic conditions. A total of 24 mice bearing SKOV3 ovarian carcinoma were divided into three groups. Following injection with pEgr‑1‑endostatin plasmid for 12 h, the mice in the endostatin‑IR‑treated group were exposed to 300 cGy/min X‑ray for 48 h, and the IR‑treated group was exposed to the same condition. Then, the expression of endostatin, hypoxia‑inducible factor (HIF)‑1α and vascular endothelial growth factor (VEGF) was detected by reverse transcription‑polymerase chain reaction, ELISA, immunohistochemistry and western blotting. In addition, the tumor microvessel density (MVD) was examined by immunohistochemistry analysis of cluster of differentiation 31‑positive cells. The results revealed that pEgr‑1‑endostatin was successfully induced by IR. The level of endostatin messenger RNA in the endostatin‑IR‑treated group was significantly higher than that in the control and IR‑treated groups (F=380.078, P<0.001). Statistical differences were also examined at the protein level by western blotting and ELISA. An obvious increase in MVD was observed in the IR‑treated group compared with that in the control group (t=7.040, P<0.001), and a significant decrease in MVD was observed in the endostatin‑IR‑treated group compared with that in the control group (t=18.153, P<0.001). By comparing the morphology of the tumor vasculature in the three groups, it was noticed that the microvessels in the endostatin‑IR‑treated group were more regularly distributed and had fewer giant branches than those in the IR‑treated group. Further investigation revealed that the expression levels of HIF‑1α and VEGF in the endostatin‑IR‑treated group were lower compared with those in the control (t=5.339, P=0.001; and t=13.880, P<0.001, respectively) and the IR‑treated groups (t=12.930, P<0.001; and t=14.050, P<0.001, respectively). Our findings suggested that endostatin decreased the number of microvessels via the HIF‑1/VEGF signaling pathway, and that pEgr‑1‑endostatin combined with IR may improve hypoxic conditions and may be a novel approach for treating solid tumors.
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Copy and paste a formatted citation
Spandidos Publications style
Zhang YC, Li XM, Yu Z, Shi XL, Li Y and Wang WL: Efficacy of pEgr‑1‑endostatin combined with ionizing radiation on hypoxic conditions in nude mice bearing SKOV3 ovarian carcinoma. Oncol Lett 13: 1101-1108, 2017.
APA
Zhang, Y., Li, X., Yu, Z., Shi, X., Li, Y., & Wang, W. (2017). Efficacy of pEgr‑1‑endostatin combined with ionizing radiation on hypoxic conditions in nude mice bearing SKOV3 ovarian carcinoma. Oncology Letters, 13, 1101-1108. https://doi.org/10.3892/ol.2017.5559
MLA
Zhang, Y., Li, X., Yu, Z., Shi, X., Li, Y., Wang, W."Efficacy of pEgr‑1‑endostatin combined with ionizing radiation on hypoxic conditions in nude mice bearing SKOV3 ovarian carcinoma". Oncology Letters 13.3 (2017): 1101-1108.
Chicago
Zhang, Y., Li, X., Yu, Z., Shi, X., Li, Y., Wang, W."Efficacy of pEgr‑1‑endostatin combined with ionizing radiation on hypoxic conditions in nude mice bearing SKOV3 ovarian carcinoma". Oncology Letters 13, no. 3 (2017): 1101-1108. https://doi.org/10.3892/ol.2017.5559
Copy and paste a formatted citation
x
Spandidos Publications style
Zhang YC, Li XM, Yu Z, Shi XL, Li Y and Wang WL: Efficacy of pEgr‑1‑endostatin combined with ionizing radiation on hypoxic conditions in nude mice bearing SKOV3 ovarian carcinoma. Oncol Lett 13: 1101-1108, 2017.
APA
Zhang, Y., Li, X., Yu, Z., Shi, X., Li, Y., & Wang, W. (2017). Efficacy of pEgr‑1‑endostatin combined with ionizing radiation on hypoxic conditions in nude mice bearing SKOV3 ovarian carcinoma. Oncology Letters, 13, 1101-1108. https://doi.org/10.3892/ol.2017.5559
MLA
Zhang, Y., Li, X., Yu, Z., Shi, X., Li, Y., Wang, W."Efficacy of pEgr‑1‑endostatin combined with ionizing radiation on hypoxic conditions in nude mice bearing SKOV3 ovarian carcinoma". Oncology Letters 13.3 (2017): 1101-1108.
Chicago
Zhang, Y., Li, X., Yu, Z., Shi, X., Li, Y., Wang, W."Efficacy of pEgr‑1‑endostatin combined with ionizing radiation on hypoxic conditions in nude mice bearing SKOV3 ovarian carcinoma". Oncology Letters 13, no. 3 (2017): 1101-1108. https://doi.org/10.3892/ol.2017.5559
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