Calcyclin在卵巢上皮性癌中的表達及其臨床意義
[Abstract]:objective
Ovarian epithelial carcinoma is one of the most common malignant tumors in women, and its mortality rate is the highest among the malignant tumors of the female reproductive system. The early symptoms of ovarian cancer patients are atypical, there is no effective early screening and specific diagnosis method, more than 70% of the patients are in the middle and advanced stage. In recent years, the 5-year survival rate of ovarian cancer patients is only about 30%-40%[42]. It is an urgent clinical problem to find effective gene therapy for ovarian cancer.
Calcyclin (Cacy) belongs to the S100 protein family. The expression of Calcyclin in pancreatic cancer, lung cancer, breast cancer, ovarian cancer, liver cancer, colorectal cancer and other types of malignant tumors was significantly increased [3,27-32]. Overexpression is associated with metastasis and poor prognosis in pancreatic cancer, osteosarcoma, gastric cancer, lung adenocarcinoma, melanoma and other malignant tumors [28,38-40].
At present, the expression of Calcyclin protein in ovarian epithelial carcinoma and its clinical significance are still unclear. The purpose of this study is to analyze the correlation between the expression of Calcyclin protein and ovarian cancer at tissue level and serum level, and to explore the feasibility of Calcyclin as a gene therapy for ovarian cancer.
Method
(1) Immunohistochemical technique was used to detect the expression of Calcyclin in 60 ovarian cancer specimens. The relationship between Calcyclin and the development of ovarian cancer was analyzed statistically.
(2) Serum Calcyclin levels in normal serum, benign ovarian tumors and ovarian cancer patients were detected by ELISA, and the correlation between serum Calcyclin levels and ovarian cancer was statistically analyzed.
(3) After specific reduction of Calcyclin expression by RNA interference, we observed the changes of cell cycle, invasiveness and cisplatin sensitivity of ovarian cancer cells, and explored the feasibility of Calcyclin as a candidate gene for targeted therapy of ovarian cancer.
Result
(1) The expression of Calcyclin in ovarian cancer tissues was detected by immunohistochemistry. The results showed that the expression of Calcyclin in poorly differentiated ovarian cancer patients (55.0%) was significantly higher than that in well differentiated ovarian cancer patients (15.4%). The expression of Calcyclin was related to the stage of operation (P < 0.05). The expression of Calcyclin increased significantly with the increase of lymph node metastasis and ascites (P < 0.05). In ovarian cancer patients with ascites and lymph node metastasis, the expression of Calcyclin increased significantly (P < 0.001).
(2) Calcyclin serum concentration was detected by ELISA. The results showed that the average serum concentration of Calcyclin in ovarian cancer patients was 1242.47+178.17 pg/ml, which was significantly higher than that in normal serum (489.73+37.86 pg/ml) and benign ovarian tumor (700.75+43.14 pg/ml), and the difference was statistically significant (P 0.01). The results showed that the serum concentration of Calcyclin in patients with stage III and stage IV ovarian cancer was 644.79+67.89pg/ml and 1087.44+104.66 pg/ml, respectively, which was significantly higher than that in patients with stage I and stage II ovarian cancer (359.35+37.82 pg/ml and 499.44+42.56 pg/ml), and the difference was statistically significant (P 0.001). The serum concentration of Calcyclin in cancer patients was 1320.08+102.59 pg/ml, which was significantly higher than that in well-differentiated (573.58+37.28 pg/ml) and moderately differentiated (832.91+75.62 pg/ml) patients (P 0.05).
(3) Cell cycle analysis showed that the proportion of G0/G1 phase in A2780 cells increased and that of S phase decreased after specific reduction of Calcyclin expression by RNA interference technique. Group decreased significantly.
(4) Transwell assay showed that the number of transfected A2780 cells significantly decreased (p < 0.05). The results suggested that the invasive ability of A2780 cells decreased with the decrease of Calcyclin expression.
(5) MTT assay showed that the inhibition rate of cisplatin on A2780 cells was increased after transfection of CalcyclinsiRNA, that is to say, the sensitivity of A2780 cells to cisplatin was increased to a certain extent. The IC50 values of 2780 cells to cisplatin were 13.42 and 11.32 mu M, respectively. The IC50 values (18.12 mu M) of the negative control siRNA group were significantly decreased.
conclusion
(1) Immunohistochemistry showed that the expression of Calcyclin was correlated with the differentiation of ovarian cancer cells, surgical stage, ascites and lymph node metastasis, suggesting that the expression of Calcyclin was closely related to the occurrence and development of ovarian cancer, invasion and metastasis and poor prognosis, which might be a reference index for clinical evaluation of disease progression and follow-up.
(2) The serum concentration of Calcyclin was significantly increased in ovarian cancer patients and correlated with surgical stage and cytological grade, suggesting that the serum concentration of Calcyclin was associated with the development of ovarian cancer. Validation of large sample studies.
(3) After transfection of CalcyclinsiRNA into ovarian cancer A2780 cells, the G0/G1 phase arrest of A2780 cells was induced, and the invasiveness of A2780 cells was decreased, and the sensitivity to cisplatin was enhanced. The high expression of Calcyclin protein could promote the malignant biological behavior of ovarian cancer A2780 cells and might be a new candidate target for targeted therapy of ovarian cancer.
【學(xué)位授予單位】:第四軍醫(yī)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:R737.31
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