热休克对H22细胞膜HSP70蛋白及其mRNA水平的影响

Influence of Heat Shock Treatment upon the Expression of Membrane HSP70 and Its mRNA of H22 Cell

研究不同热休克条件对H22小鼠肝癌细胞的HSP70mRNA及蛋白表达的影响,以期获得最佳诱导条件.分别用MTT、RT-PCR、免疫荧光和FCM检测等方法观察不同热休克条件对鼠H22细胞的生存率、胞内HSP70mRNA转录水平及胞膜HSP70蛋白表达水平的改变.结果表明,H22细胞经轻度热休克(42～43℃),细胞生存率无影响,而中重度热休克(44～45℃)则随休克时间的延长,细胞生存率明显下降;42℃热休克初期(0.5～4小时)胞内HSP70mRNA水平低于对照组,休克后期(8～12小时)mRNA水平有所恢复并逐渐增高;不同时间热休克组H22细胞胞膜HSP70表达均较对照组显著增高(P<O.005),其中非致死性热休克以12小时表达最高,42℃为59.5%,43℃为96.8%.因此适当热休克条件可引起H22细胞HSP7OmRNA的改变及膜上HSP70蛋白表达的增加,从而增加肿瘤细胞的免疫原性.

To identify the best inducing condition, we studied the expression of membrane protein HSP70 and mRNA of H22 cell at various temperature. Using MTT,RT-PCR, immunofluorescence and FCM techniques, we observed H22 cell survival rate, the expression of HSP70 mRNA and membrane HSP70. No effects of H22 cell survival rate under 42 ~ 43℃ was observed, but cell survival rate declined with increasing stress time at 44 ~ 45 ℃; the level of HSP70 mRNA decreased initially (0.5~4.0) hours but gradually resumed and increased from 8 to 12 hours at 42℃. Membrane HSP70 expressing cells were significently higher in heat shock treatment group than in a control group ( P < 0.005). The highest expressing rate was 59.5% at 42℃ and 96.8% at 43℃ after 12 hours heat treatment. Optimal heat treatment could change HSP 70 mRNA and increase expression of membrane HSP70 of H22 cell, thus probably increase immunogenicity of the tumor cells.