OncoTargets and Therapy (Sep 2019)

GADD45a Mediated Cell Cycle Inhibition Is Regulated By P53 In Bladder Cancer

  • Han N,
  • Yuan F,
  • Xian P,
  • Liu N,
  • Liu J,
  • Zhang H,
  • Zhang H,
  • Yao K,
  • Yuan G

Journal volume & issue
Vol. Volume 12
pp. 7591 – 7599

Abstract

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Na Han,1,2,* Fang Yuan,2,3,* Peng Xian,2,3,* Nan Liu,2,3 Jianmin Liu,4 Haiyan Zhang,1,2 Huayong Zhang,5 Kai Yao,6 Gangjun Yuan2,3 1Health Examination and Oncology Screening Center, Chongqing University Cancer Hospital, Chongqing 400030, People’s Republic of China; 2Chongqing Key Laboratory of Translational Research for Cancer Metastasis and Individualized Treatment, Chongqing University Cancer Hospital, Chongqing 400030, People’s Republic of China; 3Department of Urology, Chongqing University Cancer Hospital, Chongqing 400030, People’s Republic of China; 4Department of Otolaryngology Head and Neck Surgery, People’s Hospital of Deyang, Deyang 618000, People’s Republic of China; 5Department of Thyroid and Breast Surgery, The Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai 519000, People’s Republic of China; 6Department of Urology, Sun Yat-Sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou, People’s Republic of China*These authors contributed equally to this workCorrespondence: Gangjun YuanDepartment of Urology, Chongqing University Cancer Hospital, Chongqing 400030, People’s Republic of ChinaTel +86 23 6507 5629Email [email protected] YaoDepartment of Urology, Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou 510060, People’s Republic of ChinaTel +86 20 8734 3840Email [email protected]: Bladder cancer (BC) is one of the most prevalent malignancies of the genitourinary system, yet the underlying mechanism of BC progression still remains unclear. Growth arrest and DNA damage-inducible 45 alpha (GADD45a) is a repressive gene implicated in cell cycle regulation, as well as in human cancers development. However, its role in BC remains to be determined.Methods: First, quantitative real-time polymerase chain reaction (PCR) and Western blot assays were used to detect GADD45a expression in BC tissues and adjacent non-tumor tissues, as well as in bladder cancer cell lines, respectively. Then, cell counting kit-8 (CCK-8) assays, colony formation assays, and flow cytometry assays were used to measure the ability of cell growth, proliferation and cell cycle distribution. Lentiviral infection technology was used to increase gene expression, while siRNA interfering technology was used to knockdown gene expression. Finally, nude mice were used to construct tumor-burdened models in vivo by injecting tumor cells subcutaneously.Results: PCR results showed that the level of GADD45a mRNA and protein levels were lower in BC tissues than in adjacent normal tissues. After increasing GADD45a expression, both the ability of growth and proliferation of BC cells were seriously impaired. Additionally, the upregulation of GADD45a expression resulted in BC cell cycle in G2/M and S phases in a p53-regulated pathway.Conclusion: GADD45a-mediated cell cycle inhibition is regulated by p53 in bladder cancer cells.Keywords: GADD45a, bladder cancer, cell cycle, p53, proliferation

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