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CEP55 contributes to human gastric carcinoma by regulating cell proliferation

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Tumor Biology

Abstract

Centrosomal protein 55 (CEP55) is the latest found member in the centrosomal relative protein family, which participates in cell-cycle regulation. CEP55 exists in many kinds of normal tissues and tumour cells such as hepatocellular carcinoma, and is important in carcinogenesis. However, the role of CEP55 in the pathogenesis of gastric cancer (GC) remains unclear. The mRNA levels of CEP55 in GC tissues and GC cell lines were examined by quantitative real-time PCR, and the protein expression of CEP55 in GC tissues was detected by Western blot and immunohistochemistry. The role of CEP55 in regulating the proliferation of GC cell lines was investigated both in vitro and in vivo. CEP55 was strongly upregulated in human GC, indicating that CEP55 contributed to carcinogenesis and progression of GC. Ectopic overexpression of CEP55 enhanced the cell proliferation, colony formation, and tumourigenicity of GC cells, whereas CEP55 knockdown inhibited these effects. We discovered that cell transformation induced by CEP55 was mediated by the AKT signalling pathway. Overexpression of CEP55 enhanced the phosphorylation of AKT and inhibited the activity of p21 WAF1/Cip1. In addition, cellular proliferation was suppressed as a result of cell cycle arrest at the G2/M phase in CEP55-knockdown cells. CEP55 expression was elevated in GC compared with normal control tissues. Credible evidence showed that CEP55 can be a potential therapeutic target in GC.

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Acknowledgments

This work was partially supported by the National Natural Science Foundation of China (81272712, 81072031, 81101802), the Program for Development of Innovative Research Team in the First Affiliated Hospital of NJMU, the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD, JX10231801) and the translational research of early diagnosis and comprehensive treatment in pancreatic cancer (The research Special Fund For public welfare industry of health, 201202007)

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Authors and Affiliations

  1. Division of Gastric Surgery, Department of General Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, 210029, China

    Jinqiu Tao, Xiaofei Zhi, Zheng Li, Yi Zhu, Weizhi Wang, Kunling Xie, Jie Tang, Xiaoyu Zhang, Linjun Wang & Zekuan Xu

  2. Liver Transplantation Center, The First Affiliated Hospital of Nanjing Medical University, Nanjing, 210029, China

    Yuan Tian

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  1. Jinqiu Tao
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Correspondence to Zekuan Xu.

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Jinqiu Tao and Xiaofei Zhi contributed equally to this work.

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Tao, J., Zhi, X., Tian, Y. et al. CEP55 contributes to human gastric carcinoma by regulating cell proliferation. Tumor Biol. 35, 4389–4399 (2014). https://doi.org/10.1007/s13277-013-1578-1

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