ALEX1在乳腺癌中的作用及其機(jī)制研究
[Abstract]:ALEX/ARMCX (Arm proteins lost in epithelial cancers on chromosome X) is one of the members of the Arm protein family. It has only one or two Arm repeat structures, which is different from the 6-13 Arm repeat structures of classical Arm proteins. Its family members include ALEX1, ALEX2 and ALEX3. Gene expression analysis ALEX1 gene is regulated by CREB and Wnt/p-catenin pathway and can inhibit the cloning of human rectal cancer cells. These studies suggest that ALEX1 may play an inhibitory role in epithelial tumors. The expression and mechanism of ALEX1 in breast cancer are still unclear, so this paper mainly studies the expression level of ALEX1 in breast cancer tissue specimens and its effects on proliferation, cell cycle, apoptosis, invasion and metastasis of breast cancer cells and its molecular mechanism. The expression level of ALEX1 in breast cancer tissues and adjacent tissues was measured, and the expression difference between the two tissues was compared to determine the correlation between ALEX1 and clinicopathological features.Methods: The expression of ALEX1 mRNA and protein in breast cancer tissues and adjacent tissues were detected by real-time PCR, immunohistochemistry and Western blot. Results: Immunohistochemical staining of 62 pairs of breast cancer and adjacent clinical tissues showed that the expression of ALEX1 was mainly localized in cytoplasm. Statistical analysis showed that the expression level of ALEX1 protein in breast cancer tissue was lower than that in adjacent tissues (p0.01); furthermore, the relationship between the staining score of ALEX1 and the clinicopathological characteristics of breast cancer patients was analyzed. It was found that the expression of ALEX1 in breast cancer was related to the pathological grade (1 vs. 3, P = 0.026; 2 vs. 3, P = 0.045), clinical stage (I). Vs. III, P = 0.008; II vs. III, P = 0.011; lymph node metastasis (p = 0.03) and molecular typing (Luminal A vs. HER-2 overexpression, P = 0.02), but not related to patient's age, tumor size and tumor type (p0.05). In addition, 30 randomly selected breast cancer and adjacent tissues were detected by real-time PCR. ALEX 1m was found in 20 breast cancer tissues. The expression of ALEX1 protein in breast cancer and adjacent tissues was significantly lower than that in corresponding adjacent tissues (p0.01). Six pairs of breast cancer and adjacent tissues were randomly selected and detected by Western blot. The results showed that the expression of ALEX1 protein in breast cancer tissues was lower than that in corresponding adjacent tissues. The expression of ALEX1 in breast cancer tissues with lymph node metastasis was significantly lower than that in breast cancer tissues without lymph node metastasis. The expression of ALEX1 in breast cancer tissues with lymph node metastasis was significantly lower than that in breast cancer tissues without lymph node metastasis. The expression of ALEX1 in breast cancer cells was lower than that in Luminal A. Part II: Effects of ALEXl on proliferation, cell cycle and apoptosis of breast cancer cells Objective: To investigate the effects of overexpression/silencing of ALEX1 on proliferation, cycle and apoptosis of breast cancer cells SK-BR3/MCF-7. Methods: Real-time PCR and Western blot were used to detect the expression of ALEX1 in normal breast cells MCF-10A. The expression of MCF-7, T47D, SK-BR3, MDA-MB-231 in breast cancer cells and the subcellular localization of ALEX1 were detected by immunofluorescence cytochemistry. The expression of ALEX1 mRNA and protein was detected by real-time PCR and Western blot after transfection of MCF-7 with three synthetic RNAi sequences. Cell Counting Kit (CCK8) was detected after overexpression/silencing of ALEX1. Cell cycle and apoptosis were detected by flow cytometry. The results showed that the expression level of ALEX1 in breast cancer cell lines was lower than that in normal breast cell line MCF-10A, but the expression level of ALEX1 in MCF-7 cell line was higher than that in other breast cancer cell lines. The expression level of ALEX1 in SK-BR3 was the lowest and ALEX1 protein was localized in the cytoplasm. Compared with LV5-Negative Control, the expression of ALEX1 mRNA and protein in LV5-ALEX1 increased significantly. CCK8 results showed that the growth of SK-BR3 cells infected with LV5-ALEX1 lentivirus from 48 h to 96 h was inhibited significantly in LV5-ALEX1 group (p0.05). Hoechst staining and flow cytometry results The number of apoptotic cells in LV5-ALEX1 group was more than that in LV5-NC group (p0.05). After 48 hours of transient transfection of MCF-7 cells with small RNA interference, real-time PCR and Western blot results showed that the silencing effect of ALEX1 in three RNAi sequences was obvious. The experiment was divided into two groups: experimental group SiALEX1 and negative control group SiCon.CCK. The results of Hoechst staining and flow cytometry showed that the number of apoptotic cells in the SiALEX1 group was less than that in the SiCon group (p0.05). The results of flow cytometry showed that the cell cycle distribution in the over-expression/silencing ALEX1 group was fine for breast cancer. Conclusion: Overexpression of ALEX1 inhibits proliferation and induces apoptosis of breast cancer SK-BR3 cells; silencing of ALEX1 promotes proliferation and inhibits apoptosis of breast cancer MCF-7 cells. Part III: Mechanism of ALEX1-induced apoptosis of breast cancer cells Objective: To investigate the molecular mechanism of ALEX1-induced apoptosis of breast cancer cells. Methods: Western blot was used to detect the expression of apoptosis-related proteins in over-expressed/silenced ALEX1 breast cancer cells. Bioinformatics methods were used to predict the regulation of ALEX1 by microRNAs. Western blot and double luciferase reporter assays were used to verify the regulation of ALEX1 by microRNAs-590-5p. Then MCF-7 and SK-BR3 breast cancer cells were used as experimental models respectively. SK-BR3 cells were divided into NC inhibitor group and MIC-590-5P inhibitor group, and ALEX1 and apoptosis-related proteins were detected by Western blot. Next, we divided the experiment into NC MICs + GV230-NC by functional recovery test in MCF-7 cells. Groups GV230-NC+Mi-590-5P mics, NC mimics+GV230-ALEX1 and Mi-590-5P mics+GV230-ALEX1 were divided into NC inhibitor+SiCon group, SiCon+Mi-590-5P inhibitor group, NC inhibitor+SiALEX1 and Mi-590-5P inhibitor+SiALEX1 groups. Western blot analysis showed that after overexpression of ALEX1 in SK-BR3 cells, the expression of Bax, active caspase 9 and active caspase 3 was up-regulated, and the expression of Bcl-2 protein was down-regulated. After silencing ALEX1 in MCF-7 cells, the expression of Bax, active caspase 9 and active caspase 3 was down-regulated, and the expression of Bcl-2 protein was up-regulated. Compared with NC mimics, the expression of ALEX1, Bax, active caspase 9, and active caspase 3 proteins were down-regulated and the expression of Bcl-2 protein was up-regulated in MFC-7 cells and NC inhibiibited cells. Compared with tor control group, the expression of ALEX1, Bax. active caspase 9 and active caspase 3 protein was up-regulated, while the expression of Bcl-2 protein was down-regulated. Inhibiting apoptosis of MCF-7 cells via endogenous apoptosis pathway. ALEX1 is a novel target gene for microarray-590-5P. ALEX1 is regulated by microarray-590-5P and induces apoptosis of breast cancer cells through endogenous apoptosis pathway. Part IV: The role of ALEX1 in epithelial-mesenchymal transformation of breast cancer cells: Preliminary exploration of the mechanism of ALEX1 in breast cancer cells Methods: After overexpression or silencing of ALEX1 in breast cancer cells MDA-MB-231/MCF-7, the morphological changes of cells were observed under microscope; the ability of breast cancer cells to migrate and invade was detected by scratch healing and Transwell assay; and the expression of epithelial-mesenchymal markers was detected by Western blot. After overexpression of ALEX1 in MDA-MB-231 cells, the morphology of cells changed from long shuttle to polygon; the results of cell scratch test showed that the migration distance of experimental group was significantly smaller than that of LV5-NC control group; Transwell results showed that the number of cell membrane penetration was significantly less than that of control group; Western blot results showed that the type of intermediate marker N-cadhe in experimental group. The expression of RIN and Vimentin disappeared, the expression of Snail-1 and Slug did not change significantly, but the expression of Twist decreased. The expression of E-cadherin, a marker of epithelial type, increased. Transwell results showed that the number of cell membrane penetration was significantly higher than that of the control group. Western blot results showed that the expression of E-cadherin, N-cadherin, Vimentin and Twist, the expression of Snail-1 and Slug, the epithelial markers, disappeared, and the expression of N-cadherin, Vimentin and Twist, increased in the experimental group. ALEX1 can attenuate the invasion and migration of MDA-MB-231, induce MDA-MB-231 to transform from mesenchymal cells to epithelial cells; silencing ALEX1 can enhance the invasion and migration of MCF-7, and induce MCF-7 to transform from epithelial cells to mesenchymal cells. We speculate that the low expression or deletion of ALEX1 may induce the up-regulation of Twist transcription factor, and then lead to E-MB-231 transformation from mesenchymal cells. The down-regulation of epithelial markers such as CAD and the up-regulation of interstitial markers N-cad and Vimentin lead to EMT.
【學(xué)位授予單位】:重慶醫(yī)科大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2015
【分類號(hào)】:R737.9
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