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Article

Erythropoietin promotes the growth of pituitary adenomas by enhancing angiogenesis

  • Authors:
    • Jinsheng Yang
    • Zheng Xiao
    • Tao Li
    • Xuanmin Gu
    • Bo Fan
  • View Affiliations / Copyright

    Affiliations: Department of Neurosurgery, The First Affiliated Hospital of Henan University of Science and Technology, Luoyang, P.R. China, Department of Neurosurgery, the First Affiliated Hospital of Henan University of Science and Technology, Jinghua Road 24, Luoyang 471003, P.R. China
  • Pages: 1230-1237
    |
    Published online on: November 11, 2011
       https://doi.org/10.3892/ijo.2011.1261
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Abstract

rhEPO is frequently used in clinical practice to treat anemia. However, recently rhEPO has been reported to accelerate tumor growth, progression and metastasis. Many pituitary adenoma patients, particularly those with macroprolactinomas, tend to have anemia and may need rhEPO therapy. To date, whether rhEPO has deleterious effects on pituitary adenomas has not been defined. Here we demonstrated for the first time that human pituitary adenomas are EPOR negative tumors and rhEPO accelerated the tumor growth of MMQ pituitary adenoma xenografts via enhancement of angiogenesis in vivo, whereas rhEPO displayed no direct effect on MMQ cells in vitro. Our mechanistic study showed that rhEPO administration increased phosphorylation of JAK2, STAT3 and VEGF expression in human umbilical vein endothelial cells (HUVECs) in vitro and in MMQ cell xenografts in vivo. Furthermore, VEGF inhibitor attenuated rhEPO induced angiogenesis and delayed tumor growth in MMQ pituitary adenoma xenografts in vivo. JAK2 inhibitor AG490 attenuated EPO induced HUVECs proliferation, phosphorylation of JAK2, STAT3 and VEGF upregulation in vitro and inhibited EPO induced vessel formation in Chicken chorioallantoic membrane (CAM) angiogenesis model in vivo. These results suggest that rhEPO administration may promote the growth of pituitary adenomas by enhancing angiogenesis through EPO-JAK2-STAT3-VEGF signaling pathway. rhEPO should be used with caution in anemia patients bearing pituitary adenoma due to its potential deleterious effects.
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Copy and paste a formatted citation
Spandidos Publications style
Yang J, Xiao Z, Li T, Gu X and Fan B: Erythropoietin promotes the growth of pituitary adenomas by enhancing angiogenesis. Int J Oncol 40: 1230-1237, 2012.
APA
Yang, J., Xiao, Z., Li, T., Gu, X., & Fan, B. (2012). Erythropoietin promotes the growth of pituitary adenomas by enhancing angiogenesis. International Journal of Oncology, 40, 1230-1237. https://doi.org/10.3892/ijo.2011.1261
MLA
Yang, J., Xiao, Z., Li, T., Gu, X., Fan, B."Erythropoietin promotes the growth of pituitary adenomas by enhancing angiogenesis". International Journal of Oncology 40.4 (2012): 1230-1237.
Chicago
Yang, J., Xiao, Z., Li, T., Gu, X., Fan, B."Erythropoietin promotes the growth of pituitary adenomas by enhancing angiogenesis". International Journal of Oncology 40, no. 4 (2012): 1230-1237. https://doi.org/10.3892/ijo.2011.1261
Copy and paste a formatted citation
x
Spandidos Publications style
Yang J, Xiao Z, Li T, Gu X and Fan B: Erythropoietin promotes the growth of pituitary adenomas by enhancing angiogenesis. Int J Oncol 40: 1230-1237, 2012.
APA
Yang, J., Xiao, Z., Li, T., Gu, X., & Fan, B. (2012). Erythropoietin promotes the growth of pituitary adenomas by enhancing angiogenesis. International Journal of Oncology, 40, 1230-1237. https://doi.org/10.3892/ijo.2011.1261
MLA
Yang, J., Xiao, Z., Li, T., Gu, X., Fan, B."Erythropoietin promotes the growth of pituitary adenomas by enhancing angiogenesis". International Journal of Oncology 40.4 (2012): 1230-1237.
Chicago
Yang, J., Xiao, Z., Li, T., Gu, X., Fan, B."Erythropoietin promotes the growth of pituitary adenomas by enhancing angiogenesis". International Journal of Oncology 40, no. 4 (2012): 1230-1237. https://doi.org/10.3892/ijo.2011.1261
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