The effect of Heat shock protein 70 antiseuse oligonucleotides to the bladder cancer in mouse loaded with tumor

Abstract

Objective To investigate The effect of Heat shock protein 70(HSP70) antisense oligonucleotides (ASO)to bladder carcinoma in mouse loaded with tumor.Methods The 40 mice loaded with tumor subcutaneously were established by cultured BIU-87 cells,and divided into 4 groups randomly when the subcutaneous neoplasms grew to about 100 mm3,namely,HSP70 mRNA ASO plus mitomycin C(MMC)group;HSP70 mRNA ASO group;MMC and blank control.HSP70 mRNA ASO were injected into neoplasms,10mmg/kg weight,twice every week,and MMC 0.1mg/kg weight,twice every week,and the above schemes were replaced with normal saline to blank.The neoplasms were peeled off,photograghed and weighed in 30 days.HSP70 expressions were examined with reverse transcription polymerase chain reaction (RT-PCR),mierovaseular density(MVD)was evaluated by immunohis to chemical staining and the tumor cells apoptosis was detected by terrainal deoxynucleotidyl transferase(TdT)-mediated dUTP-biotin nick end labeling technique (TUNEL).Results The tumor inhibition rate in ASO+MMC surpassed 50%.more than ASO or MMC respectively,and the differences were significantly(P＜0.05).The ASO and MMC exceeded blank group respectively(P＜0.05).The ASO was the same as the MMC(P＞0.05).The apoptotic index(AI)in ASO+MMC surpassed the other three groups (P＜0.05).The difference between ASO and MMC was not significant (P＞0.05),while the A1 of ASO or MMC was more than blank respectively(P＜0.05).The results of MVD were in accordance with the above results.Conclusion The injection of HSP70 mRNA ASO in tumor locally can inhibit neoplasm growth,and this effect might correlate with the inhibition of apoptosis and microvascular forming resulting from the ASO. Key words: Heat shock protein 70; Antisense oligonucleotides; Bladder carcinoma; Mierovaseular density; Apoptosis