Downregulation of OSR1 Promotes Colon Adenocarcinoma Progression via FAK-Mediated Akt and MAPK Signaling

Abstract

Fang Zhang, Zheng Jiang Department of Gastroenterology, First Affiliated Hospital, Chongqing Medical University, Chongqing 400016, People’s Republic of ChinaCorrespondence: Zheng JiangDepartment of Gastroenterology, First Affiliated Hospital, Chongqing Medical University, 1 Youyi Road, Yuzhong District, Chongqing 400016, People’s Republic of ChinaEmail [email protected]: Odd-skipped related transcription factor 1 (OSR1) is a newly identified tumor suppressor in many tumor types. However, the role and mechanism of OSR1 in colon adenocarcinoma (COAD) remain unknown.Methods: OSR1 expression was detected in COAD tissues and cells. COAD cells with OSR1 overexpression or knockdown were analyzed by in vitro CCK-8, transwell and flow cytometry assays, and by in vivo xenograft model.Results: OSR1 expression was downregulated in COAD and low expression level of OSR1 was positively correlated with tumor stage and lymph node metastasis. Furthermore, low OSR1 expression was significantly associated with poor overall survival (OS) and distant metastasis-free survival (DMFS). Lentivirus-mediated restoration of OSR1 expression-inhibited proliferation, invasion and migration while induced cell cycle arrest and apoptosis in COAD cells in vitro, and inhibited tumor growth in vivo. In contrast, OSR1 knockdown promoted proliferation, invasion and migration in COAD cells in vitro. Mechanistically, OSR1 exerted anticancer effects by inhibiting FAK-mediated activation of Akt and MAPK pathways.Conclusion: Our findings suggest that OSR1 functions as a tumor suppressor in COAD by suppressing FAK-mediated activation of Akt and MAPK pathways.Keywords: OSR1, colon adenocarcinoma, tumor suppressor, FAK, Akt, MAPK

Keywords

• osr1
• colon adenocarcinoma
• tumor suppressor
• fak
• akt: mapk