細胞骨架蛋白MICAL-L2和ACTN4在上皮性卵巢癌中的表達及其功能研究
[Abstract]:Objective: To investigate the role of cytoskeleton protein MICAL-L2 and its interacting protein alpha-comyosin 4 (ACTN4) in the development, invasion and metastasis of epithelial ovarian cancer (EOC) in vitro and in vivo.
Methods: (1) The expression of MICAL-L2 protein in human epithelial ovarian cancer tissue microarray was detected by immunohistochemistry, and the relationship between MICAL-L2 and clinicopathological characteristics of human ovarian cancer was studied. (2) The human ovarian cancer cell line stably interfering with MICAL-L2 was constructed by lentivirus transfection technique. CCK8 method, scratch test, empty puncture test and adhesive puncture test were used. Methods The effects of interfering with MICAL-L2 on cell proliferation, migration and invasion were examined. (3) Cell morphology and EMT-related molecular markers were detected by immunofluorescence assay. (4) EMT-related molecular markers and related molecules in downstream pathway were detected by Western blotting. (6) The activity of TOP/FOP in Wnt pathway was detected by luciferase reporter gene. (7) The interaction between MICAL-L2 and ACTN4 was preliminarily verified by RT-PCR and siRNA interference. (8) The interaction between MICAL-L2 and ACTN4 was analyzed by TCGA database. The relationship between TN4 and the prognosis of ovarian cancer. (9) The relationship between ACTN4 and drug resistance in ovarian cancer was analyzed by MTT and flow cytometry.
Results: (1) The high expression rate of MICAL-L2 in epithelial ovarian cancer (68.60%) was significantly higher than that in normal control group (16.67%). The high expression rate of MICAL-L2 in ovarian cancer stage III-IV (81.40%) was significantly higher than that in stage I-II (55.81%) (P = 0.011); the high expression rate in histological grade G2 and G3 was significantly higher than that in stage G1 (P = 0.009). After stably interfering with MICAL-L2 gene, the proliferation, migration and invasiveness of the cells were significantly decreased compared with the control group (p < 0.01). (3) F-actin, E-cadherin and vimentin were detected by immunofluorescence, and the morphology of the cells was significantly changed after interfering with the stabilization of MICAL-L2. The results of Western blotting showed that the expression of E-cadherin increased, the expression of vimentin decreased, the expression of vimentin decreased and the expression of E-cadherin decreased. The expression of Cyclin-D1 in the downstream of Wnt/beta-catenin pathway was decreased. (5) The expression of SNAIL, SLUG, TWIST, ZEB1 and ZEB2 in the interfering MICAL-L2 group and control group was detected by RT-PCR. The results showed that SNAIL and SLUG did not change after interfering with MICAL-L2, and the expression of TWIST, ZEB1 and ZEB2 decreased significantly at mRNA level. Low and statistically significant (P 0.05). (6) TOP / FOP luciferase reporter gene detection of Wnt pathway transcriptional activity, the results showed that after interfering with MICAL-L2, TOP activity was significantly lower than the control group, FOP activity was not significantly changed. (7) RT-PCR and siRNA interference analysis of the relationship between MICAL-L2 and ACTN4, the results showed that the high expression of MICAL-L2 fine. The expression of ACTN4 was also higher in the cell lines, and the expression of ACTN4 was significantly lower after transient interference with MICAL-L2. (8) TCGA database analysis showed that ACTN4 was significantly correlated with the prognosis of ovarian cancer patients, and the prognosis of patients with ACTN4 gene change was poor, and there was statistical significance (P 0.01). (9) The sensitivity of ovarian cancer cells transfected with ACTN4-siRNA to paclitaxel increased (P < 0.0). 5) apoptosis rate increased (P < 0.05).
Conclusion:
1, the high expression of MICAL-L2 in ovarian cancer is related to the clinical stage and histological grading of ovarian cancer.
2, MCIAL-L2 can promote the proliferation, migration and invasion of ovarian cancer cells.
3, MICAL-L2 can promote the occurrence of EMT in ovarian cancer cells.
4. Activating the classical Wnt/beta-catenin pathway and promoting the activation of Rac1 may be one of the mechanisms of EMT induced by MICAL-L2 in ovarian cancer cells.
5. ACTN4 is closely related to the poor prognosis of ovarian cancer. It may participate in the chemotherapeutic resistance to paclitaxel by inhibiting the apoptosis of ovarian cancer cells.
6, inhibition of MCIAL-L2 and ACTN4 will provide a new target for clinical treatment of ovarian cancer.
【學位授予單位】:蘇州大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:R737.31
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