Expressions Of RKIP And E-cadherin In Prostate Cancer And Their Significance

Object:To investigate the expressions of RKIP(Raf kinase inhibitor protein)and E-cadherin(Epithelial cadherin)in prostate cancer tissues and the correlation between them.To evaluate RKIP and E-cadherin's relationship with prostate cancer's clinical periodization and pathological classification,and probe into the mechanism of RKIP's suppression of cancer metastasis.Materials and Methods:Collected prostate cancer tissue specimens totalling 26,embedded in ceresin wax,which were verified by pathological diagnosis as experimental group.And collected 14 prostate proliferation tissue specimens,embedded in ceresin wax,which were verified by pathological diagnosis as control group.Immunofluorescence histochemistry staining was adopted as detection method,and the first antibodies used were respectively goat anti-human RKIP antibody and rabbit anti-human E-cadherin antibody while the second antibodies used were respectively FITC-labeled rabbit anti-goat IgG and TRITC-labeled goat anti-rabbit IgG.Used professional image measuring software Image-Pro Plus 6.0 to successively analyze and measured the fluorescent photos collected.Calculated the positive fluorescent areas' mean densities [mean density=(IOD SUM)/(area sum)],which represented the expression levels of RKIP and E-cadherin in corresponding tissues. Statistical analysises were performed with the use of SPSS 12.0 software, two specimen equal numbers were tested by T-test,correlative analysis between two variable quantities were analyzed by pearson-analysis,and for all statistical tests,the level of significance was set at P＜0.05.Results:1.RKIP expression in prostate cancer and benign prostatic hypertrophy tissue specimens:Immunofluorescence histochemistry staining's mean density was 0.06515±0.012597 in 26 prostate cancer tissue specimens while the value was 0.07655±0.010970 in 14 benign prostatic hypertrophy tissue specimens,there are conspicuous statistical significance of the positive expression difference between the experimental group and the control group(P＜0.05).2.RKIP expression in prostate cancer's benign differentiation group and malign differentiation group:Immunofluorescence histochemistry staining's mean density was 0.07208±0.013283 in 12 prostate cancer tissue specimens of benign differentiation group while the value was 0.05921±0.008577 in 14 prostate cancer tissue specimens of malign differentiation group,there are conspicuous statistical significance of the positive expression difference between the benign differentiation group and the malign differentiation group(P＜0.05).3.RKIP expression in prostate cancer's invasive metastasis group and non-invasive metastasis group:Immunofluorescence histochemistry staining's mean density was 0.06000±0.010622 in 13 prostate cancer tissue specimens of invasive metastasis group while the value is 0.07031±0.012658 in 13 prostate cancer tissue specimens of non-invasive metastasis group,there are conspicuous statistical significance of the positive expression difference between the invasive metastasis group and the non-invasive metastasis group.4.E-cad expression in prostate cancer and benign prostatic hypertrophy tissue specimens:Immunofluorescence histochemistry staining's mean density is 0.04977±0.012346 in 26 prostate cancer tissue specimens while the value is 0.05917±0.009554 in 14 benign prostatic hypertrophy tissue specimens,there are conspicuous statistical significance of the positive expression difference between the experimental group and the control group(P＜0.05).5.E-cad expression in prostate cancer's benign differentiation group and malign differentiation group:Immunofluorescence histochemistry staining's mean density was 0.05567±0.013553 in 12 prostate cancer tissue specimens of benign differentiation group while the value was 0.04471±0.008835 in 14 prostate cancer tissue specimens of malign differentiation group,there are conspicuous statistical significance of the positive expression difference between the benign differentiation group and the malign differentiation group(P＜0.05).6.E-cad expression in prostate cancer's invasive metastasis group and non-invasive metastasis group: Immunofluorescence histochemistry staining's mean density was 0.05500±0.012767 in 13 prostate cancer tissue specimens of invasive metastasis group while the value was 0.04454±0.009761 in 13 prostate cancer tissue specimens of non-invasive metastasis group,there are conspicuous statistical significance of the positive expression difference between the invasive metastasis group and the non-invasive metastasis group(P＜0.05).7.Analysis of correlation between RKIP expression and E-cad expression in 26 prostate cancer tissue specimens:analysis showed a obvious correlation between RKIP expression and E-cad expression in prostate cancer tissue specimens(r=0.0491,p=0.011＜0.05)Conclusions:1.RKIP is a novel metastasis suppressor gene,its decreased expression can increase prostate cancer's invasive capability and suppress prostate cancer's differentiation.2.E-cad is a classic metastasis suppressor factor,its decreased expression can increase prostate cancer's invasive capability,and its expression level is positively associated with the differentiation of prostate cancer.3.RKIP expression is obviously associated with E-cad expression in prostate cancer,the mechanism of RKIP's suppression of prostate cancer metastasis may lies in its indirectly regulating the expression of classic tumor metastasis correlation factors including E-cad,VEGF by influencing the signaling pathways such as Raf,TGF-β,etc.