PDCD6 cooperates with C-Raf to facilitate colorectal cancer progression via Raf/MEK/ERK activation

• Published in: Journal of experimental & clinical cancer research 2020-08, Vol.39 (1), p.147-147, Article 147
• Main Authors: Wang, Xiaojuan, Wu, Fan, Wang, Han, Duan, Xiaoyuan, Huang, Rong, Tuersuntuoheti, Amannisa, Su, Luying, Yan, Shida, Zhao, Yuechao, Lu, Yan, Li, Kai, Yao, Jinjie, Luo, Zhiwen, Guo, Lei, Liu, Jianmei, Chen, Xiao, Lu, Yalan, Hu, Hanjie, Li, Xingchen, Bao, Mandula, Bi, Xinyu, Du, Boyu, Miao, Shiying, Cai, Jianqiang, Wang, Linfang, Zhou, Haitao, Ying, Jianming, Song, Wei, Zhao, Hong
• Format: Article
• Language: English
• Subjects: Analysis; Animals; Antibodies; Apoptosis; Apoptosis Regulatory Proteins - genetics; Apoptosis Regulatory Proteins - metabolism; Biomarkers, Tumor - genetics; Biomarkers, Tumor - metabolism; Calcium-Binding Proteins - genetics; Calcium-Binding Proteins - metabolism; Cell death; Cell growth; Cell Proliferation; Cloning; Colorectal cancer; Colorectal Neoplasms - genetics; Colorectal Neoplasms - metabolism; Colorectal Neoplasms - pathology; Development and progression; Female; Gene expression; Gene Expression Regulation, Neoplastic; Growth; Humans; Immunohistochemistry; Kinases; Male; MAP Kinase Signaling System; MAPK signaling pathway; Medical prognosis; Mice; Mice, Inbred BALB C; Mice, Nude; Middle Aged; PDCD6; Plasmids; Prognosis; Proteins; Proto-Oncogene Proteins c-raf - genetics; Proto-Oncogene Proteins c-raf - metabolism; RNA; Signal transduction; Survival Rate; T cell receptors; Tumor Cells, Cultured; Tumorigenesis; Xenograft Model Antitumor Assays
• ISSN: 1756-9966; 0392-9078; 1756-9966
• DOI: 10.1186/s13046-020-01632-9

Colorectal cancer (CRC) is one of the most common malignancies, and it's expected that the CRC burden will substantially increase in the next two decades. New biomarkers for targeted treatment and associated molecular mechanism of tumorigenesis remain to be explored. In this study, we investigated whether PDCD6 plays an oncogenic role in colorectal cancer and its underlying mechanism. Programmed cell death protein 6 (PDCD6) expression in CRC samples were analyzed by immunohistochemistry and immunofluorescence. The prognosis between PDCD6 and clinical features were analyzed. The roles of PDCD6 in cellular proliferation and tumor growth were measured by using CCK8, colony formation, and tumor xenograft in nude mice. RNA-sequence (RNA-seq), Mass Spectrum (MS), Co-Immunoprecipitation (Co-IP) and Western blot were utilized to investigate the mechanism of tumor progression. Immunohistochemistry (IHC) and quantitative real-time PCR (qRT-PCR) were performed to determine the correlation of PDCD6 and MAPK pathway. Higher expression levels of PDCD6 in tumor tissues were associated with a poorer prognosis in patients with CRC. Furthermore, PDCD6 increased cell proliferation in vitro and tumor growth in vivo. Mechanistically, RNA-seq showed that PDCD6 could affect the activation of the MAPK signaling pathway. PDCD6 interacted with c-Raf, resulting in the activation of downstream c-Raf/MEK/ERK pathway and the upregulation of core cell proliferation genes such as MYC and JUN. These findings reveal the oncogenic effect of PDCD6 in CRC by activating c-Raf/MEK/ERK pathway and indicate that PDCD6 might be a potential prognostic indicator and therapeutic target for patients with colorectal cancer.