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~(125)Ⅰ放射性粒子组织间植入治疗肝癌的实验研究
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摘要
目的
     探讨I125籽源组织间植入对裸鼠移植性肝癌的治疗效果、剂量与疗效的关系,外周血的影响以及I125籽源近距离低剂量率持续照射对荷人肝癌裸鼠移植瘤生长和细胞增殖抑制,细胞凋亡,微血管生成和凋亡相关蛋白的影响,为临床I125籽源植入近距离治疗中晚期肝癌提供实验依据。
     方法
     在BALB/C-nu裸鼠左前肢腋窝皮下注射HEP-G2肝癌细胞7×106/0.3ml建立荷人肝癌HEP-G2裸鼠移植瘤模型40只,选取建立模型成功的36只裸鼠。选取14天后在皮下扪及肿瘤直径约6mm及10mm的荷瘤鼠各18只,把其分别随机分成两个不同治疗剂量组和一个对照组,每组6只裸鼠。通过治疗计划系统TPS确定植入I125粒子剂量。肿瘤直径约6mm治疗组分别植入1粒表面活度为0.7mci,0.9mci的I125粒子,对照组植入无活性的空心粒子,肿瘤直径约10mm治疗组分别植入2粒表面活度为0.7mci,0.9mci的I125粒子,对照组植入无活性的空心粒子,粒子植入后每7d测量一次肿瘤直径并计算各组肿瘤体积抑制率,对裸鼠进行治疗前后血常规检查,28天后处死裸鼠,制作肿瘤组织标本,进行常规病理学检查。通过免疫组织化学来检测Ki67,UEA-1,bcl-2,bax的表达及原位末端标记法(TUNEL)检测凋亡,计算出微血管密度。
     结果
     1直径约6mm肿瘤经过活度0.7mCi,0.9 mCi 125I粒子治疗后体积变化,实验组肿瘤生长趋停止,前二周体积无明显增大,二周后体积开始缩小;对照组肿瘤继续生长,体积每周都有增大。二组自治疗后第7天起即差异显著(治疗后第7、14、21、28天0.7mci实验组与对照组的P值分别为(P= 0.0045,P<0.0001, P<0.0001和P<0.0001),0.9mci实验组与对照组的P值均小于0.05。直径10mm肿瘤经活度1.4mCi,1.8mCi 125I粒子治疗后体积变化,对照组肿瘤继续生长,体积每周都有增大。1.4mCi,1.8 mCi 125I粒子治疗后7天内与对照组相比体积减少无显著差异(P>0.05),治疗后第7,14、21、28天1.4mci与1.8mci实验组与对照组的P值分别P<0.05。此外治疗后从14天起1.4mci与1.8mci实验组体积相比,P<0.05,说明这两个不同剂量组体积有显著差异。125I粒子治疗各组病理切片肿瘤细胞呈不同程度的变性坏死,剂量越大坏死越严重,但远离粒子处仍可见存活肿瘤细胞。治疗后存活裸鼠各组治疗前后血常规各指标无明显改变,差异无显著性(P>0.05)。
     2. Ki67表达强度在0.7mci125 I粒子治疗组为“++-++++,0.9 mci125 I粒子治疗组为“++-+++,对照组为+++-++++”。0.7mci,0.9mci组,对照组三组间有显著性差异(秩和检验,u= 2.923, 0.025     0.7mci及0.9mci125 I粒子治疗组的bcl-2/bax比值为0.37士0.04,0.28士0.02,对照组为0.69士0.07, 0.7mci,0.9mci与对照组之间有显著性差异(P=0.000),0.7mci与0.9mci组间有显著性差异(P=0.008)。1.4mci及1.8mci125 I粒子治疗组的bcl-2/bax比值为0.41士0.06,0.33士0.04,对照组为0.76士0.04, 1.4mci,1.8mci与对照组之间有显著性差异(P=0.000),1.4mci与1.8mci组间有显著性差异(P=0.008)。
     0.7mci,0.9mci125 I粒子治疗组MVD分别为6.17士1.47,3.67士0.82,对照组MVD为18.67士2.16,0.7mci,0.9mci与对照组之间有显著性差异〔P=0.000)。1.4mci,1.8mci125 I粒子治疗组MVD分别为10.5士1.87,7.17士1.17,对照组MVD为28.33士2.42,1.4mci,1.8mci与对照组之间有显著性差异〔P=0.000)。
     TUNEL法检测凋亡:0.7mci,0.9mci125 I粒子治疗组凋亡指数(%)分别为11.00士2.90,18.33士2.16,对照组凋亡指数(%)为6.00士1.41,0.7mci,0.9mci与对照组之间有显著性差异〔P=0.000)。1.4mci,1.8mci125 I粒子治疗组凋亡指数(%)分别为16.83士2.48,30.67士3.78,对照组凋亡指数(%)为10.4士2.42,1.4mci,1.8mci与对照组之间有显著性差异〔P=0.000)。
     结论
     125I粒子组织间植入对裸鼠移植性肝癌持续照射可以直接杀死荷瘤鼠肝癌细胞,也可以抑制肿瘤细胞增殖,减少血管生成,诱导肿瘤细胞凋亡,从而可以抑制肿瘤的生长。而且术前的治疗计划对较好的疗效有很好的指导作用。
Objective
     The purpose of this thesis is to provide experimental basis for clinical application of iodine -125 seeds implantation by Investigating the therapeutic effect of iodine -125 interstitial brachytherapy seeds on the transplanted liver cancer of BALB/C nude mice and to analyse the influence of doses of radiation to tumor, its surrouding tissue and the blood cells and to analyse the effect of low dose rate and continuous irradiation with iodine -125 seeds in inhibiting proliferation, inducing apoptosis in HEP-G2 cell line and the treatment effect, influence on proliferation, angiogenesis, apoptosis related protein of iodine -125 seeds brathytherapy to liver cancer in nude mice.
     Methods
     4x106/0.3m1 HEP-G2 cells were transplanted subcutaneously in the left axillary fossa of BALB/C nude mice, and forty transplanted liver cancer models were produced ,thirty-six fitable models were selected to take an animal experimental research. 14 days later nude mice with a tumor of 6mm or 10mm in mean diameter were produced and separately divided into two different therapeutic dose group and a control group. Each group included 6 nude mice. One iodine -125 seed (surface radioactivity 0.7mci,0.9mci) was implanted into each tumor of mice in 6mm treatment group and the tumor in control group was implanted into One iodine -125 seed (surface radioactivity 0mci );two iodine-125 seeds(surface radioactivity 0.7mci,0.9mci) were implanted into each tumor of mice in 10mm treatment group and the tumor in control group was implanted into two iodine -125 seeds (surface radioactivity 0mci ); Tumors' dimensions of two groups were measured per 7 days and tumor volume inhibition rates were calculated. The blood cells of mice were also observed before and after treatment. After 28 days, nude mice were killed and routine pathological slides of tumor tissue were observed under light microscope to evaluate the degree and range of tumor tissues damaged by iodine -125 seeds. The expression of Proliferating Cell related Nuclear Antigen (Ki67), UEA-1 ,bcl-2 and bax were examined with immunohistochemical methods in six groups. The ratio of bcl-2/bax ,apoptosis by TUNEL way and MVD in six group were calculated.
     results
     1. In two weeks followed I125 seeds implantation, there were no volume difference in 0.7mci,0.9mci treatment group tumor, two weeks later the volume in 0.7mci and 0.9mci treatment group tumor in 6mm tumor beagn to reduce ,the control group tumor had been growing . There were significant differences between the 0.7mci ,0.9mci group and the control group xenograft volumes 7 days ,14 days ,21 days and 28 days later after implantation (P= 0.0045,P<0.0001, P<0.0001和P<0.0001,P<0.05,P<0.05,P<0.05,P<0.05).In seven days after I125 seeds implantation, there were no volume difference between 1.4mci,1.8mci treatment group tumor and the control group , There were significant difference between the 1.4mci ,1.8mci group and the control group xenograft volumes 7 days ,14 days ,21 days and 28 days later after implantation (P <0. 05),in addition there were volume difference between 1.4mci treatment group and 1.8mci treatment group。Routine pathological examination showed that dramatically coagulative necrosis and degenerative necrosis of tumor cells at the periphery of active I125 seeds, while there were still viable cells far away from I125 seed.No significant difference of the blood cells in nude mice were observed before and after treatment (P>0.05)
     2. Immunohistochemical examination showed that the expression of ki67 in 0.7mci ,0.9mci I125 seed implantation group was”++-++++,++-+++,”while in control group the expression was“+++一+++++”.There were significant difference among the 0.7mci,0.9mci groups,the control group.(u= 2.923, 0.025     The ratio of bcl-2/bax in 0.7mci,0.9mci treatment group and the control group was 0.37士0.04,0.28士0.02, 0.69士0.07, There were significant difference between the 0.7mci,0.9mci groups and the control group separately(P=0.000,P=0.000)。There were alse significant difference between the 0.7mci and 0.9mci group(P=0.008).The ratio of bcl-2/bax in 1.4mci,1.8mci treatment group and the control group was 0.41士0.06, 0.33士0.04, 0.76士0.04, There were significant difference between the 1.4mci,1.8mci groups and the control group separately(P=0.000,P=0.000)。There were alse significant difference between the 1.4mci and 1.8mci group(P=0.008)。
     The value of MVD in 0.7mci,0.9mci treatment group and the control group was 6.17士1.47,3.67士0.82, MVD为18.67士2.16, There were significant difference between the 0.7mci,0.9mci groups and the control group separately(P=0.000,P=0.000)。the value of MVD in 1.4mci,1.8mci treatment group and the control group was 10.5士1.87,7.17士1.17,28.33士2.42,There were significant difference between the 0.7mci,0.9mci groups and the control group separately(P=0.000,P=0.000)。
     The index of apoptosis in 0.7mci,0.9mci treatment group and the control group was 11.00士2.90,18.33士2.16, 6.00士1.41。There were significant difference between the 0.7mci,0.9mci groups and the control group separately(P=0.000,P=0.000)。The index of apoptosis in 1.4mci,1.8mci treatment group and the control group was 16.83士2.48,30.67士3.78,10.4士1.67,There were significant difference between the 1.4mci,1.8mci groups and the control group separately(P=0.000,P=0.000)。
     Conclusion
     Iodine-125 seed implantation brachytherapy may inhabit the growth of the transplanted liver cancer of BALB/C nude mice by killing tumor cells around iodine-125 seed, inhabiting proliferation of tumor cells, inducing apoptosis and down-regulating angiogenesis.Preoperation treatment plan system alse has a very good guidence in the therapeutic effect.
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