Structural Maintenance of Chromosome Protein 4 Promotes the Progression of Cardia Adenocarcinoma via Regulation of the Wnt/β-catenin Signaling Pathway


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Abstract

Background:Structural maintenance of chromosome protein 4 (SMC4) is crucial for chromosome assembly and separation, but its role and mechanism in cardia adenocarcinoma (CA) are unknown.

Methods:SMC4 expression levels were initially detected by protein profiling in 20 pairs of CA tumor tissues and adjacent normal tissues. The level of SMC4 expression in CA cells was then evaluated using a western blot analysis. Cell proliferation was evaluated by CCK-8 and clone formation tests. Scratch and transwell tests were used to investigate cell migration as well as invasion, while through the flow cytometry, we examined the cell apoptosis and progression of the cell cycle. The regulatory effects of the epithelial-mesenchymal transition (EMT) and the Wnt/β- catenin pathway were investigated using western blot. A tumorigenesis experiment was used to investigate the influence of SMC4 on tumor development in nude mice.

Results:This study showed overexpression of SMC4 in CA tissues and cells. Knockdown of SMC4 can significantly inhibit the proliferation, migration and invasion, stimulate cell apoptosis, induce cell cycle arrest in the G0/G1 phase of CA cells, and inhibit tumor growth in vivo. In addition, down-regulation of SMC4 resulted in decreased expression of Bcl-2, Cyclin D1, CDK4, CDK6, β-catenin, phosphorylated GSK-3β, N-cadherin, and Vimentin, with an increased level of proteins, i.e., Bax, cleaved-caspase3, and E-cadherin. When SMC4 was overexpressed, these effects were reversed.

Conclusion:SMC4 can facilitate the biological progression of CA, suggesting that SMC4 could be a potential therapeutic target for the disease.

About the authors

Mengqi Zhu

Department of Surgical Oncology, The First Affiliated Hospital of Bengbu Medical College

Email: info@benthamscience.net

Xinxin Zhang

Department of Surgical Oncology, The First Affiliated Hospital of Bengbu Medical College

Email: info@benthamscience.net

Kaiji Gao

Department of Surgical Oncology, The First Affiliated Hospital of Bengbu Medical College

Email: info@benthamscience.net

Lingmei Zhang

Department of Gynecological Oncology,, The First Affiliated Hospital of Bengbu Medical College

Email: info@benthamscience.net

Xiaojia Feng

Department of Surgical Oncology, The First Affiliated Hospital of Bengbu Medical College

Email: info@benthamscience.net

Hui Wang

Department of Surgical Oncology, The First Affiliated Hospital of Bengbu Medical College

Email: info@benthamscience.net

Jing Li

Department of Surgical Oncology, The First Affiliated Hospital of Bengbu Medical College

Email: info@benthamscience.net

Jianguang Jia

Department of Surgical Oncology, The First Affiliated Hospital of Bengbu Medical College

Author for correspondence.
Email: info@benthamscience.net

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