肝动脉灌注化疗后肝细胞癌8-OHdG、p53和p21~(waf1/cip1)的表达研究

目的 探讨肝细胞癌(hepatocellular carcinoma,HCC)患者经导管肝动脉灌注化疗(transcathcter arterial chemotherapy,TAC)后肝组织8-羟基-2'脱氧鸟嘌呤核苷(8-hydroxy-2'-deoxyguanosine,8-OHdG)、p53和p21_(waf1/cip1)蛋白的表达.方法 HCC患者分为两组,术前行TAC治疗的HCC患者39例(TAC组),术前未行TAC治疗的HCC患者50例(非化疗组),肝血管瘤和肝内胆管结石患者15例为对照组.免疫组织化学法检测肝组织的8-OHdG、p53和p21~(waf1/cip1)蛋白表达水平.结果 8-OHdG表达在癌组织中表现为非化疗组高于TAC组(F=9.516,P＜0.05),对照组最低(F=9.516,P＜0.01);在TAC组与非化疗组均为癌组织高于痛旁组织(分别t=7.101,t=8.020,均P＜0.001);癌旁组织与对照组的8-OHdG水平差异尤统计学意义;TAC组与非化疗组巾的癌组织和癌旁组织的8-OHdG表达呈正相关(r=0.651,r=0.493,均P＜0.001).p53表达在TAC组和非化疗组差异无统计学意义.p21~(waf1/cip1)三组间有差异表达.在癌组织中和癌旁组织p21~(waf1/cip1)表达均为对照组最高(F=13.459,F=16.613,均P＜0.001),TAC组高于非化疗组(F=13.459,F=16.613,均P＜0.01),但癌组织和癌旁组织比较差异无统计学意义.21_(waf1/cip1)在非化疗组中癌组织和癌旁组织表达的水平呈正相关(r=0.872,P＜0.001).结论 HCC痛组织的8-OHdG、p53和p21~(waf1/cip1)的表达高于痛旁和非HCC肝组织;癌细胞可能经由增强的氧化应激修复机制逃脱介入化疗.

Oxidative stress in liver tissues in HCC patients after TACE

Objective To investigate the levels of oxidative stress in liver tissues of hepatocelluar carcinoma(HCC)patients after transcatheter arterial chemotherapy(TAC).Methods Immunohistochemistry streptavidin biotinylated peroxidase(S-P)method was used to detect the cellular levels of 8-hydroxy-2'-deoxyguanosine(8-OHdG),p53 and p21~(waf1/cip1).Eighty-nine HCC patients were divided into TAC group(39 cases)and Non-TAC group(50 cases).15 Non-HCC liver tissues served as controls.Result 8-OHdG level was higher in Non-TAC group than that in TAC group in tumor tissues (F=9.516,P＜0.05),with that being the lowest in control group(F=9.516,P＜0.01);8-OHdG levels in cancer tissues were significantly higher than that in tumor surrounding tissues in both TAC group (t=7.101,P＜0.001)and Non-TAC group(t=8.020,P＜0.001),there was no significant difference of 8-OHdG levels between para-tumor tissues and controls.The levels of 8-OHdG between tumor and its surrounding tissues in TAC group(r=0.651,P＜0.001)and non-TAC group(r=0.493,P＜0.01)was in positive correlation.The difference of p53 levels in cancer tissues in TAC group and Non-TAC group were not statistically significant and p53 was not detected in para-tumor tissues.The difference of p21~(waf1/cip1) levels among TAC group,Non-TAC group and controls was statistically significant,the levels of p21~(waf1/cip1) in normal group was the highest(F=13.459,P＜0.001),followed by that in TAC and Non-TAC group in cancer tissues(TAC vs.Non-TAC group,P＜0.01);p21~(waf1/cip1) expression in normal controls was significantly higher than that in both TAC and Non-TAC group in para-tumor tissues(F=16.613,P＜0.001).The correlation of p21 ~(waf1/cip1) levels between tumor and its surrounding tissues was significant in non-TAC group(r=0.872,P＜0.001).Conclusions Oxidative stress levels in HCC tumor tissues were higher than in para-tumor tissues and non-HCC liver tissues.Cancer cells probably survive chemotherapy by fortifying oxidative stress repair mechanism.