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Article

Podocalyxin promotes glioblastoma multiforme cell invasion and proliferation by inhibiting angiotensin-(1-7)/Mas signaling

  • Authors:
    • Bo Liu
    • Yu Liu
    • Yugang Jiang
  • View Affiliations / Copyright

    Affiliations: Department of Neurosurgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, P.R. China
  • Pages: 2583-2591
    |
    Published online on: February 20, 2015
       https://doi.org/10.3892/or.2015.3813
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Abstract

Podocalyxin (PODX) reportedly enhances invasion in many human cancers including glioblastoma multiforme (GBM). Recent studies have shown that the local renin‑angiotensin system (RAS) in tumor environment contributes significantly to tumor progression. As a counter-regulatory axis in RAS, angiotensin (Ang)-(1-7)/Mas signaling has been shown to inhibit the growth and invasiveness of several human cancers including GBM. In the present study, we examined the crosstalk between PODX and Ang-(1-7)/Mas signaling in GBM cells, and assessed its impact on GBM cell invasion and proliferation. A strong negative correlation between the expression of PODX and Mas in GBM tumor tissues from 10 consecutive patients (r=-0.768, p<0.01) was observed. The stable overexpression of PODX in LN-229 and U-118 MG human GBM cells decreased the expression of Mas at the mRNA and protein levels, which led to decreased density of Ang-(1-7)-binding Mas on the cell membrane. This effect was completely abolished by selective phosphatidylinositol 3-kinase (PI3K) inhibitor BKM120. By contrast, the stable knockdown of PODX in LN-229 and U-118 MG cells increased the expression of Mas and the density of Ang-(1-7)-binding Mas on the cell membrane. Overexpression and knockdown of PODX respectively reversed and enhanced the inhibitory effects of Ang-(1-7) on the expression/activity of matrix metalloproteinase-9 and cell invasion and proliferation in GBM cells. Although the overexpression of Mas showed no significant effect on the promoting effect of PODX on GBM cell invasion and proliferation in the absence of Ang-(1-7), it completely eliminated the effect of PODX in the presence of Ang-(1-7). In conclusion, to the best of our knowledge, the present study provided the first evidence that PODX inhibits Ang-(1-7)/Mas signaling by downregulating the expression of Mas through a PI3K-dependent mechanism in GBM cells. This effect led to enhanced GBM cell invasion and proliferation. The results of this study add new insight into the biological functions of PODX and the molecular mechanisms underlying GBM progression.
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Copy and paste a formatted citation
Spandidos Publications style
Liu B, Liu Y and Jiang Y: Podocalyxin promotes glioblastoma multiforme cell invasion and proliferation by inhibiting angiotensin-(1-7)/Mas signaling. Oncol Rep 33: 2583-2591, 2015.
APA
Liu, B., Liu, Y., & Jiang, Y. (2015). Podocalyxin promotes glioblastoma multiforme cell invasion and proliferation by inhibiting angiotensin-(1-7)/Mas signaling. Oncology Reports, 33, 2583-2591. https://doi.org/10.3892/or.2015.3813
MLA
Liu, B., Liu, Y., Jiang, Y."Podocalyxin promotes glioblastoma multiforme cell invasion and proliferation by inhibiting angiotensin-(1-7)/Mas signaling". Oncology Reports 33.5 (2015): 2583-2591.
Chicago
Liu, B., Liu, Y., Jiang, Y."Podocalyxin promotes glioblastoma multiforme cell invasion and proliferation by inhibiting angiotensin-(1-7)/Mas signaling". Oncology Reports 33, no. 5 (2015): 2583-2591. https://doi.org/10.3892/or.2015.3813
Copy and paste a formatted citation
x
Spandidos Publications style
Liu B, Liu Y and Jiang Y: Podocalyxin promotes glioblastoma multiforme cell invasion and proliferation by inhibiting angiotensin-(1-7)/Mas signaling. Oncol Rep 33: 2583-2591, 2015.
APA
Liu, B., Liu, Y., & Jiang, Y. (2015). Podocalyxin promotes glioblastoma multiforme cell invasion and proliferation by inhibiting angiotensin-(1-7)/Mas signaling. Oncology Reports, 33, 2583-2591. https://doi.org/10.3892/or.2015.3813
MLA
Liu, B., Liu, Y., Jiang, Y."Podocalyxin promotes glioblastoma multiforme cell invasion and proliferation by inhibiting angiotensin-(1-7)/Mas signaling". Oncology Reports 33.5 (2015): 2583-2591.
Chicago
Liu, B., Liu, Y., Jiang, Y."Podocalyxin promotes glioblastoma multiforme cell invasion and proliferation by inhibiting angiotensin-(1-7)/Mas signaling". Oncology Reports 33, no. 5 (2015): 2583-2591. https://doi.org/10.3892/or.2015.3813
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