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PPM1D exerts its oncogenic properties in human pancreatic cancer through multiple mechanisms

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Abstract

Protein phosphatase, Mg2+/Mn2+ dependent, 1D (PPM1D) is emerging as an oncogene by virtue of its negative control on several tumor suppressor pathways. However, the clinical significance of PPM1D in pancreatic cancer (PC) has not been defined. In this study, we determined PPM1D expression in human PC tissues and cell lines and their irrespective noncancerous controls. We subsequently investigated the functional role of PPM1D in the migration, invasion, and apoptosis of MIA PaCa-2 and PANC-1 PC cells in vitro and explored the signaling pathways involved. Furthermore, we examined the role of PPM1D in PC tumorigenesis in vivo. Our results showed that PPM1D is overexpressed in human PC tissues and cell lines and significantly correlated with tumor growth and metastasis. PPM1D promotes PC cell migration and invasion via potentiation of the Wnt/β-catenin pathway through downregulation of apoptosis-stimulating of p53 protein 2 (ASPP2). In contrast to PPM1D, our results showed that ASPP2 is downregulated in PC tissues. Additionally, PPM1D suppresses PC cell apoptosis via inhibition of the p38 MAPK/p53 pathway through both dephosphorylation of p38 MAPK and downregulation of ASPP2. Furthermore, PPM1D promotes PC tumor growth in vivo. Our results demonstrated that PPM1D is an oncogene in PC.

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Acknowledgments

This study was supported by Department of General Surgery, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai, China.

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    Authors and Affiliations

    1. Department of General Surgery, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, 600 YiShan Road, Shanghai, Shanghai, 200233, China

      Bo Wu, Bo-Min Guo, Jie Kang, Xian-Zhao Deng, You-Ben Fan & Kai-Xing Ai

    2. Institution of Interventional and Vascular surgery, Tongji University, 301 Middle Yan Chang Rd, Shanghai, 200072, China

      Xiao-Ping Zhang

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    1. Bo Wu
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    Correspondence to Xiao-Ping Zhang or Kai-Xing Ai.

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    Bo Wu and Bo-Min Guo are co-first authors and these authors have contributed equally to this work.

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    Wu, B., Guo, BM., Kang, J. et al. PPM1D exerts its oncogenic properties in human pancreatic cancer through multiple mechanisms. Apoptosis 21, 365–378 (2016). https://doi.org/10.1007/s10495-015-1211-4

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