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Serine/Threonine Protein Phosphatase-5 Accelerates Cell Growth and Migration in Human Glioma

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Abstract

Glioma is the most common type of primary central nervous system tumor. Ser/Thr protein phosphatase 5 (PP5) has been shown to regulate multiple signaling cascades that suppress growth and facilitate apoptosis in several human cancer cells. However, the role of PP5 in human gliomas remains unclear. Herein, the relationship between PP5 expression and glioma cell growth was investigated, and the therapeutic value of PP5 in glioma was further evaluated. We employed a short hairpin RNA targeting PPP5C gene to knock down PP5 expression in human glioma cell lines U251 and U373. Depletion of PPP5C via RNAi remarkably inhibited glioma cell proliferation and colony formation, and arrested cell cycle in the G0/G1 phase. Moreover, knockdown of PP5 markedly suppressed glioma cell migration, as determined by Transwell assay. Our findings suggest that PPP5C could be essential for glioma cell growth and serve as a promising therapeutic target in human gliomas.

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    Authors and Affiliations

    1. Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, 45 Changchun Street, Xicheng District, Beijing, 100053, China

      Xinglong Zhi, Hongqi Zhang, Chuan He, Yukui Wei, Lisong Bian & Guilin Li

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    1. Xinglong Zhi
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    2. Hongqi Zhang
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    3. Chuan He
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    4. Yukui Wei
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    5. Lisong Bian
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    6. Guilin Li
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    Correspondence to Guilin Li.

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    Xinglong Zhi and Hongqi Zhang have equally contributed to this work.

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    Fig. S1

    Off-target exclusion assay of PPP5C using Lv-shPPP5C-S2 in U251 cells. a qPCR analysis of PPP5C knockdown efficiency by Lv-shPPP5C-S2 in U251 cells. b Western blot analysis of PPP5C knockdown efficiency by Lv-shPPP5C-S2 in U251 cells. c Growth curve of U251 cells after Lv-shPPP5C-S2 infection by MTT assay. d Representative images of colonies formed in Lv-shPPP5C-S2 infected U251 cells (scale bar: 250 µm). e Statistical analysis of colonies numbers in Lv-shPPP5C-S2 infected U251 cells. **: p < 0.01, ***: p < 0.001. Supplementary material 1 (TIFF 772 kb)

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    Zhi, X., Zhang, H., He, C. et al. Serine/Threonine Protein Phosphatase-5 Accelerates Cell Growth and Migration in Human Glioma. Cell Mol Neurobiol 35, 669–677 (2015). https://doi.org/10.1007/s10571-015-0162-1

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