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Objective To investigate the expression of Dysadherin and analyze its role in renal clear cell carcinoma (RCCC).Methods RT-PCR and immunohistochemical were used to detect the expression of Dysadherin in 60 cases of fresh RCCC and 60 adjacent normal renal tissues(male 35,female 25; age 37-78,median age 61; ＞7 cm 24,≤7 cm 36; Ⅰ/Ⅱ 39,Ⅲ/Ⅳ 21).Results Dysadherin mRNA expression in RCCC tissues (2.0043±0.2890) was higher than that in adjacent normal renal tissues (0.8461 ±0.2479) (t =6.8020,P ＜ 0.05).Dysadherin expression was associated with nuclear grade.The expression of Dysadherin in nucleus grade Ⅲ and Ⅳ tumors were significantly higher than that in nucleus grade Ⅰ and Ⅱ tumors [the mRNA expression were 4.6224±0.3194,2.7780±0.2288,the positive rates of protein were 64.1％ (25/39),95.2 ％ (20/21) (t =6.5750,x2 =5.495,P ＜ 0.05)].There was no association between the expression of Dysadherin with sex (t =1.0530,x2 =0.023),age(t =0.0511,x2 =0.089) and tumor size (t =1.0330,x2 =0.370) (P ＞ 0.05).Conclusion In RCCC,Dysadherin expression is positively associated with tumor aggressiveness based on grading.It seems that Dysadherin may be a valuable prognostic marker in RCCC.
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Objective To investigate the effect of dysadherin gene silencing on metastasis and invasion in pancreatic cancer cell line PANC1,BxPC3 in vitro.Methods PANC1 and BxPC3 cells were divided into dysa group,negative siRNA control group(HK),liposomes control group(control),dysa group and HK group were tranfected by dysadherin siRNA and Negative siRNA,respectively.The expression of dysadherin mRNA and protein were detected by RT-PCR and immunohistochemical method.Transwell test was used to evaluate the invasion ability of pancreatic cancer cells.Results After transfected by dysadherin siRNA,the dysadherin mRNA levels in PANC1 and Bxpc3 cells were decreased by 95.4% and 52.1%.The expression of dysadherin protein was also down-regulated by 91.2% and 83.6%,respectively,when compared with HK groups (P＜0.05 ).The numbers of invasive cells migrated in Transwell in PANC1 cells control group,HK group and dysa group were 163.2±15.5,154.4±17.3 and 53.6±7.9;the numbers of invasive cells in BxPC cells control group,HK group and dysa group were 30.7±3.2,27.5±2.8 and 4.7±2.4,respectively.The numbers in dysa group were significantly lower than those of HK group and control group (P＜0.01 ).Conclusions Silencing the dysadherin gene of PANC1,BxPC3 by RNA interference could significantly inhibit the invasive and migratory ability of canceroas cells.