目的 觀察下調Ras同源類似物E (RhoE)表達對人乳腺癌細胞231生物學行為的影響。 方法 蛋白質印跡技術檢測小干擾RNA（siRNA）轉染前后RhoE在乳腺癌細胞231中的表達；RhoE siRNA的細胞轉染 用lipofectamine?2000脂質體法；Cell Counting Kit-8檢測轉染細胞及對照細胞的增殖變化；損傷刮擦試驗和體外侵襲實驗（Transwell小室）分別檢測轉染細胞及對照細胞的遷移與侵襲能力。 結果 RhoE在乳腺癌細胞231中的表達較高；成功轉染RhoE siRNA的乳腺癌細胞，蛋白質印跡顯示RhoE的表達被明顯的抑制；RhoE的表達被抑制后對乳腺癌細胞的增殖、遷移和侵襲有著明顯的促進作用。 結論 下調RhoE 表達能夠明顯促進乳腺癌細胞的增殖﹑遷移和侵襲，RhoE可能在乳腺癌的發生發展中起著重要作用。
The aim of this article is to study the regulatory feedback loop between β-catenin and IQ motif containing GTPase activating protein 1 (IQGAP1), as well as the effect of this regulation loop in colon cancer cell proliferation. Western blot was used to detect the expression of IQGAP1 and β-catenin after changing their expression respectively by transfection in SW1116 cells. CCK-8 cell proliferation assay was used to detect the effect of IQGAP1 involved in the proliferation of SW1116 cells promoted by β-catenin. The results of Western blot indicated that β-catenin could positively regulate IQGAP1, while IQGAP1 silencing could up-regulate β-catenin, forming a negative feedback loop. The results of CCK-8 showed that IQGAP1 silencing inhibited β-catenin-mediated proliferation in SW1116 cells. In conclusion, our research reveals a negative regulatory feedback loop between β-catenin and IQGAP1 which has a remarkable effect on the proliferation ability of colon cancer cells.