Effects of RUNX3 mediated Notch signaling pathway on biological characteristics of colorectal cancer cells

Li,Hang; Li,Dan; Meng,Ning

doi:10.3892/ijo.2017.3988

Effects of RUNX3 mediated Notch signaling pathway on biological characteristics of colorectal cancer cells

Authors:
- Hang Li
- Dan Li
- Ning Meng
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Affiliations: Department of General Surgery, The Affiliated Hospital of Hangzhou Normal University, Hangzhou, Zhejiang 310015, P.R. China
Published online on: May 8, 2017 https://doi.org/10.3892/ijo.2017.3988
Pages: 2059-2068

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Abstract

This study investigated the effects of runt-related transcription factor 3 (RUNX3) mediated Notch pathway on the biological behavior of colorectal cancer (CRC) SW260 cells. CRC tissues and para-carcinoma tissues were collected from 182 CRC patients who had undergone surgical treatment between January 2008 and December 2010. Immunohistochemical staining with streptavidin-peroxidase (SP) was used to detect RUNX3, Notch1 and Jagged 1 expression levels. CRC SW260 cells were divided into the following groups: Control group, si-NC group, si-RUNX3 group, DAPT group, si-RUNX3+DAPT group, and si-NC+DAPT group. Expression levels of RUNX3, and Notch signaling related genes were measured by real-time fluorescence quantitative polymerase chain reaction (RT-qPCR) and western blotting in vitro. Besides, MTT, soft agar colony formation, Annexin V-FITC/PI double staining and Transwell were performed to analyze the effects of RUNX3 on cell growth and metastasis. Lower positive expression rate of RUNX3 and higher positive expression rate of Notch1 and Jagged 1 were observed in CRC tissues than those in normal adjacent tissues with a negative correlation, and the expression levels were associated with the differentiation degree, TNM staging, lymph node metastasis and tumor invasion depth (all P<0.05). RUNX3 expression was reduced in si-RUNX3 and si-RUNX3+DAPT group but the expression levels of Notch signaling related genes were markedly increased in si-RUNX3 group or decreased in DAPT and si-NC+DAPT group, as compared with those in the control group (all P<0.05). In addition, the proliferation, colony formation, migration and invasion abilities of SW260 cells were enhanced in si-RUNX3 group but were restricted in DAPT and si-NC+DAPT group, which was contrary to cell apoptosis (all P<0.05). RUNX3 contributes to attenuate the proliferation and metastasis of CRC cells, and promotes cell apoptosis through inhibition of Notch signaling pathway.

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