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The impact of C-MYC gene expression on gastric cancer cell

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Abstract

The upregulation or mutation of C-MYC has been observed in gastric, colon, breast, and lung tumors and in Burkitt’s lymphoma. However, little is known about the role C-MYC plays in gastric adenocarcinoma. In the present study, we intended to investigate the influence of C-MYC on the growth, proliferation, apoptosis, invasion, and cell cycle of the gastric cancer cell line SGC7901 and the gastric cell line HFE145. C-MYC cDNA was subcloned into a constitutive vector PCDNA3.1 followed by transfection in normal gastric cell line HFE145 by using liposome. Then stable transfectants were selected and appraised. Specific inhibition of C-MYC was achieved using a vector-based siRNA system which was transfected in gastric cancer cell line SGC7901. The apoptosis and cell cycles of these clones were analyzed by using flow cytometric assay. The growth and proliferation were analyzed by cell growth curves and colony-forming assay, respectively. The invasion of these clones was analyzed by using cell migration assay. The C-MYC stable expression clones (HFE-Myc) and C-MYC RNAi cells (SGC-MR) were detected and compared with their control groups, respectively. HFE-Myc grew faster than HFE145 and HFE-PC (HFE145 transfected with PCDNA3.1 vector). SGC-MR1, 2 grew slower than SGC7901 and SGC-MS1, 2 (SGC7901 transfected with scrambled control duplexes). The cell counts of HFE-Myc in the third, fourth, fifth, sixth, and seventh days were significantly more than those of control groups (P < 0.05). Those of SGC-MR1, 2 in the fourth, fifth, sixth, and seventh days were significantly fewer than those of control groups (P < 0.05). Cell cycle analysis showed that proportions of HFE-Myc and SGC-MR cells in G0–G1 and G2–M were different significantly with their control groups, respectively (P < 0.05). The apoptosis rate of HFE-Myc was significantly higher than those of control groups (P < 0.05). Results of colony-forming assay showed that the colony formation rate of HFE-Myc was higher than those of control groups; otherwise, the rate of SGC-MR was lower than those of their control groups (P < 0.05). The results of cell migration assay showed that there were no significant differences between experimental groups and control groups (P > 0.05). In conclusion, C-MYC can promote the growth and proliferation of normal gastric cells, and knockdown of C-MYC can restrain the growth and proliferation of gastric cancer cells. It can induce cell apoptosis and help tumor cell maintain malignant phenotype. But it can have not a detectable influence on the ability of invasion of gastric cancer cells.

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Acknowledgments

The authors wish to thank Drs. Haili Huang and Gangshi Wang, and Nurse Weidi You, Weihua Wang et al., for handling patient contacts. We wish to thank the Forth Military Medical University of PLA for providing means for the current investigation.

Conflict of interest statement

The authors declare no competing interest.

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Authors and Affiliations

  1. Department of Gastroenterology, The 309 Hospital of PLA, Beijing, 100091, People’s Republic of China

    Lin Zhang, Yanhong Hou, Liucun Gao, Yanjie Xu, Kai Wu, Junshan Zhai & Lei Zhang

  2. Medicine and Cancer Center, Howard University Cancer Center, Washington, DC, USA

    Hassan Ashktorab

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  1. Lin Zhang
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Correspondence to Lin Zhang.

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Zhang, L., Hou, Y., Ashktorab, H. et al. The impact of C-MYC gene expression on gastric cancer cell. Mol Cell Biochem 344, 125–135 (2010). https://doi.org/10.1007/s11010-010-0536-0

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