血清饥饿和表皮生长因子上调人肝癌细胞表皮生长因子受体的研究

目的探讨血清饥饿以及EGF对人肝癌细胞EGFR表达的影响。方法用免疫组化方法研究血清饥饿、5ng／mlEGF和25ng／EGF对人肝癌细胞EGFR表达的影响。结果撤血清培养组、5ng／mlEGF和25ng／mlEGF刺激组人肝癌细胞EGFR的表达阳性细胞分别为(5.66±0.86)％、(10.67±1.26)％和(16.83±1.66)％，与正常对照组(1.81±0.75)％相比较差异显著(P<0.01)，EGF刺激组比血清饥饿组明显增高(P<0.01)、25ng／mlEGF组比5ng／mlEGF组增高(P<0.01)。结论血清饥饿和EGF能明显增强人肝癌EGFR的表达，且EGF上调EGFR表达的作用具有剂量依赖效应。

UP-REGULATION OF EGFR EXPRESSION BY SERUM STARVATION AND EGF IN HEPATOCELLULAR CARCINOMA CELLS

Objective:To investigate the effect of serum starvation on expression of EGFR and the effect on expression of EGFR by EGF in human hepatocellular carcinoma cells. Methods: Human hepatocellular carcinoma cells were treated with serum-free culture medium and the concentration of the 5ng/ml EGF,25ng/ml EGF in culture medium respectively for six hours,and then the expression of EGFR in BEL7402 human hepatocellular carcinoma cells was studyed by immunohistochemistry technique. Results:Our results indicate that the positive cells of EGFR expression in human hepatocellular carcinoma cells were(5.66 + 0.86) % 、 ( 10.67 + 1.26) % and (16.83 + 1.66) % respectively. Compared with normal control group( 1.81 + 0.75) %, the EGFR expression of theirs was significantly higher than that of control group while the positive cells of the group treated with EGF were more higher than that of group cultured in serun-free culture medium,and also the expression of EGFR of group treated with the concentration of the 25ng/ml EGF was higher than that of group treated with the concentration of the 5ng/ml EGF. Conclusion:Serum starvation and EGF can enhance the expression of EGFR in human hepatocellular carcinoma obviously. The up-regulation of EGFR expression by EGF in HCC cells was showed dose depended.