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Jian-Wei Zheng, Xin Wang, Yu-Cun Liu, Yuan-Lian Wan, Department of General Surgery, Peking University First Hospital, Beijing 100034, China
Hong-Fang Yin, Department of Pathology, Peking University First Hospital, Beijing 100034, China
Jing Zhu, Surgical Laboratory, Peking University First Hospital, Beijing 100034, China
Correspondence to: Xin Wang, Associate Professor, Department of General Surgery, Peking University First Hospital, 8 Xishiku Avenue, Xicheng District, Beijing 100034, China. wangxin_guo@hotmail.com
Received: February 3, 2013 Revised: March 5, 2013 Accepted: March 8, 2013 Published online: March 28, 2013
AIM: To study the effect of silencing of paxillin overexpression on cell signaling and ultrastructure in colorectal carcinoma cell line SW480.
METHODS: Using empty plasmid as a negative control, two siRNA fragments were transfected into a colorectal carcinoma cell line SW480 which overexpresses paxillin. Stably transfected cells were screened and three new cell lines NC, SW545 and SW782 were obtained, which carried the negative control, the siRNA targeting the site 545-565, and the siRNA targeting the site 782-802, respectively. The expression and site-specific phosphorylation of paxillin, FAK, ERK1/2 and AKT1/2/3 were examined in the four cell lines by Western blot. Specimens were prepared with cultured carcinoma cells to observe cell ultrastructure by transmission electron microscopy.
RESULTS: Paxillin overexpression in SW545 cells was not silenced at all, whereas silenced paxillin overexpression and remarkably reduced phosphorylation of paxillin (Tyr118) were observed in SW782 cells. Expression of AKT1/2/3 and FAK as well as their site-specific phosphorylation were substantially the same in the four cell lines. Although expression of ERK1/2 was substantially the same in the four cell lines, significantly reduced phosphorylation of ERK1/2 (Thr202/Tyr204) was observed in SW782 cells. There was no distinct ultrastructural difference between NC cells and SW480 cells, whereas dramatic ultrastructural changes were observed in SW782 cells, such as much more microvilli, microfilament and microtubule bundles, lysosomes and much less mitochondria.
CONCLUSION: Paxillin overexpression may play an important role in the malignant transformation of colorectal carcinoma cells, which is characterized by dramatic ultrastructural changes that can be reversed by silencing paxillin overexpression. Activation of ERK1/2 signaling downstream of paxillin is indispensable for the malignant transformation of colorectal carcinoma cells.
Citation: Zheng JW, Yin HF, Wang X, Liu YC, Wan YL, Zhu J. SiRNA-mediated silencing of paxillin down-regulates ERK1/2 signaling and alters cell ultrastructure in colorectal carcinoma cell line SW480. Shijie Huaren Xiaohua Zazhi 2013; 21(9): 754-760
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