GABABR/GSK-3β/NF-κB signaling pathway regulates the proliferation of colorectal cancer cells

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• 作者：Qing Shu ; Jun Liu ; Xiupeng Liu ; Sufang Zhao ; Hualin Li ; Yonggang Tan and Jianming Xu
• 刊名：Cancer Medicine
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：5
• 期：6
• 页码：1259-1267
• 全文大小：583K
• ISSN：2045-7634

文摘

Colorectal cancer is one of the leading causes of highly fatal cancer-related deaths in the whole world. Fast growth is critical characteristic of colorectal cancer, the underlying regulatory mechanism of colorectal cell fast proliferation remains largely unknown. Here, we reported that activation of metabotropic γ-Aminobutyric acid receptor (GABA_BR) signaling significantly inhibited the colorectal cell HT29 proliferation by arresting the cell at G1 phase. Inhibition of GABA_BR activated GSK-3β by reducing the phosphorylation level of GSK-3β. Activation of GSK-3β blocked the function of GABA_BR signaling on repressing cell proliferation. We further found that GABA_BR activation inhibited NF-κB activity. The promotion of cell proliferation caused by downregulation of GABR_BR could be blocked by inhibition of NF-κB activation. Overall, activation of GABA_BR leaded to inhibition of GSK-3β activation to repress the NF-κB function during colorectal cancer cell proliferation. This study revealed critical function of GABA_BR/GSK-3β/NF-κB signaling pathway on regulating proliferation of colorectal cancer cell, which might provide a potential therapeutic target for clinical colorectal cancer treatment.