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作 者:程竞仪[1] 梁治平[1] 肖锡宾[2] 张昌卿[2] 梁昌盛[1] 刘长征[1]
机构地区:[1]中山大学中山医学院实验核医学教研室,广州510080 [2]中山大学肿瘤防治中心中心实验室
出 处:《中华核医学杂志》2008年第1期31-34,共4页Chinese Journal of Nuclear Medicine
基 金:国家自然科学基金(30070231)
摘 要:目的 在前人工作的基础上,分别设计了内放疗和化疗靶向治疗药物——鼻咽癌单克隆抗体^188Re标记物^188Re鼻咽癌单克隆抗体(BAC5)]和BAC5与平阳霉素(PYM)的耦联物(PYM-BAC5),观察了两药联合使用对体外培养的鼻咽癌细胞(CNE2)的抑制作用。方法直接法标记^188Re-BAC5以SnCl2、2-巯基乙醇(2-ME)和柠檬酸-酒石酸作还原剂和耦联剂,葡聚糖T-40被氧化成多醛基葡聚糖(PAD)用以耦联PYM和BAC5。四甲基偶氮唑蓝(MTr)法检测2种抗肿瘤药物对体外培养CNE2的抑制作用,并以^188ReO4-、188Re-mlgG和PYM为对照组,生理盐水为空白对照组。结果^188Re-BAC5标记率为92%~95%,放射性浓度为5254kBq/ml;PYM.BAC,中m(PYM):m(BAC,)=1:0.526,n(PYM):n(BAC5)=1:51。2种药单独治疗组、联合治疗组及各自对照组的抑制效应都呈明显的剂量-效应关系。但^188Re-BAC5,对CNE2的抑制作用随放射性浓度的增加而增加,半数抑制浓度(Ic50)为264kBq/ml,抑制作用明显强于^188ReO4^-(IC50=882kSq/m1)和^188Re-mIgG(IC50=1062kSq/ml)组。PYM-BAC5的IC50为10.07μg/ml,而单纯PYM的IC50为63.60μg/ml;合用药中^188Re-BAC5的IC50为32.1kBq/ml,PYM-BAC5的IC50为1.70μg/ml,分别明显小于2种药单用时各自的IC50,以上各组差异均有统计学意义(t=22.62和37.70,P〈0.01)。结论靶向治疗组(^188Re-BAC5)抑瘤效果明显好于非靶向组;联合靶向治疗组(^188Re-BAC5+PYM-BAC5)的抑瘤效果明显好于单独用药组。Objective Combination of radiation and chemical agents was supposed to have better effect on nasopharyngeal cancer. This study compared the in vitro inhibiting effects of ^188Re-monoclonal antibody ( BAC5 ) with or without pingyangmycin conjugated BAC5 ( PYM-BAC5 ) on nasopharyngeal carcinoma cells (CNE2). Methods ^188Re-BAC5 was prepared using 2-mercaptoethanol ( ME), citric acid and tartaric acid as reducing and transchelation agents. Oxidized dextran T-40 (polyaldehyde dextran, PAD) was used to conjugate PYM to BACs. 3- (4, 5-dimethylthiazol-2-y1) -2, 5-diphenylte-trazolium bromide (MTr) method was applied to assess anti-tumor effects of ^188Re-BAC5 and PYM-BAC5 on CNE2 cells. Results The labeling efficiency of ^188Re-BAC5 was 92%~95% with a radioactive concentration of 5254 kBq/ml. The composition of PYM-BAC5 was m ( PYM ) : m ( BAC5 ) = 1 : 0. 526, or n ( PYM ) : n ( BAC5 ) = 1 : 51. The inhibition effects of each treatment regime were in a dose dependent manner. The 50% inhibition doses (IC59) of ^188Re-BAC5, ^188Re-mIgG and ^188ReO4- were 264, 1062 and 882 kBq/ml, respectively. The ICso of the PYM-BAC5 and free PYM were 10.07 and 63.60 μg/ml, respectively. Combining ^188Re-BAC5 and PYM-BAC5 reduced the ICso of ^188Re-BAC5 and PYM-BAC5 down to 32.1 kBq/ml and 1.70 μg/ml. Conclusions It was proved that targeted therapy had better anti-tumor effect. The combination of targeted radiation and chemical agents ( ^188Re-BAC5 + PYM-BAC5 ) obtained the best therapeutic effect on cultured CNE2 cells.
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