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

摘要

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.%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.