Correlation study on expression of GST-π protein in brain tissue and peripheral blood of epilepsy rats induced by pilocarpine

Previous studies have suggested that glutathione-S-transferase π (GST-π) over-expression in the brain tissue is associated with refractory epilepsy.However,whether the change in GST-π level in the peri...     

卵巢上皮性癌中GST-π、TopoⅡβ、MDR1的表达及其与化疗疗效的关系

目的观察卵巢上皮性癌化疗耐药基因谷胱甘肽S-转移酶-（GST-）、拓扑异构酶（TopoⅡ）和多药耐药基因1（MDR1）mRNA水平表达及其与化疗疗效的关系。方法采用逆转录-聚合酶链反应（RT-PCR）检测60例卵巢上皮性癌和60例正常卵巢组织GST-、TopoⅡ和MDR1 mRNA的表达。结果正常组织中GST-及MDR1mRNA为阴性表达,TopoⅡmRNA为阳性表达。卵巢癌中GST-mRNA阳性表达为51.67%,各病理类型间差异无统计学意义（P〉0.05）,不同肿瘤分化程度阳性表达率差异无统计学意义（P〉0.05）,晚期患者阳性表达率高于早期（P〈0.05）。TopoⅡmRNA阳性表达率为55%,各病理类型间差异无统计学意义（P〉0.05）,不同肿瘤分化程度阳性表达率差异无统计学意义（P〉0.05）,早期患者阳性表达率高于晚期（P〈0.01）。MDR1 mRNA阳性表达率为35%,各病理类型间差异无统计学意义（P〉0.05）,高中分化组间差异无统计学意义（P〉0.05）,中低分化间差异有统计学意义（P〈0.05）,高低分化组间差异有显著统计学意义（P〈0.01）,临床分期间阳性表达率差异无统计学意义（P〉0.05）。讨论检测GST-、TopoⅡ和MDR1对卵巢癌化疗药物的选择具有指导意义,在一定程度上能预测化疗疗效。     

β-榄香烯增强奥沙利铂抑制人胃癌细胞的增殖及其机制

目的：探讨β-榄香烯联合奥沙利铂对人胃癌SGC7901细胞增殖的影响,并进一步探讨其机制。方法：MTT法检测细胞的药物敏感性,流式细胞术PI染色检测细胞凋亡,Western Blot检测蛋白表达,应用SPSS（13.0软件包）进行统计学分析。结果：奥沙利铂以剂量依赖的方式抑制SGC7901细胞增殖,24h的IC50为（28.29±3.67）mg/L;低毒剂量（5μg/ml）的β-榄香烯联合奥沙利铂组细胞IC50明显降低至（14.04±0.71）mg/L,且明显增强了奥沙利铂诱导的细胞凋亡（P〈0.05）;进一步检测了β-榄香烯作用后GST-π蛋白的表达情况,结果显示β-榄香烯以剂量依赖的方式下调GST-π蛋白表达。结论：β-榄香烯增强奥沙利铂抑制人胃癌细胞的细胞毒作用,其机制可能与降低GST-π蛋白的表达有关。     

A novel micelle of coumarin derivative monoend-functionalized PEG for anti-tumor drug delivery: in vitro and in vivo study

In this paper, a novel micelle for anti-tumor drug delivery was reported. Two 7-carboxymethoxy coumarin molecules were immobilized on the terminal group of a methoxy poly(ethylene glycol) chain via l-lysine as linker. The amphiphilic 7-carboxymethoxy coumarin monoend-functionalized methoxy poly(ethylene glycol) (mPEG-Lys-DCOU) chains were self-assembled micelles. Anti-tumor drug doxorubicin was loaded in the mPEG-Lys-DCOU micelles and the release profile was studied. The cytotoxicity of mPEG-Lys-DCOU was evaluated by NIH 3T3 fibroblasts. The drug-loaded micelles were incubated with HepG2 tumor cells to investigate the in vitro anti-tumor effect. The in vivo inhibition efficacy of drug-loaded micelles was carried out on 4T1 breast cancer animal model. The results showed that both hydrophobic and π-π stacking interactions within mPEG-Lys-DCOU amphiphiles were contributed to the self-assembly. Both blank and drug loaded micelles were monodisperse nanoparticles with the average diameters around 300?nm. The release profile exhibited certain pH dependence. The drug release rate at pH?=?5.5 was much faster than that at pH?=?7.4. mPEG-Lys-DCOU amphiphiles were non-toxic to NIH 3T3 fibroblasts. Both in vitro and in vivo studies demonstrated that the inhibition efficacy of drug-loaded micelles were comparable to that of doxorubicin hydrochloride. mPEG-Lys-DCOU micelles are promising carriers for anti-tumor drug delivery.     

四种耐药基因蛋白及Ki-67在浸润性乳腺癌组织中表达的临床意义

目的:探讨Pgp、TS、GST-π、TopoⅡ和Ki-67在浸润性乳腺癌组织中的表达,并探讨其临床意义。方法:采用免疫组织化学Envision法检测267例乳腺癌患者Pgp、TS、GST-π、TopoⅡ和Ki-67的表达,分析它们与患者的临床病理特征的相关性。结果:乳腺癌患者Ki-67增殖指数为:27.73%±21.85%,Pgp、TS、GST-π、TopoⅡ的阳性率分别为69.29%、64.04%、23.60%、29.21%;Ki-67与肿块直径、ER、PR具有相关性;Pgp与肿块大小具有相关性;GST-π、TopoⅡ与ER、PR具有相关性;Pgp与TS、GST-π呈正相关性,TopoⅡ与TS呈负相关性,与Ki-67呈正相关性。结论:Pgp、TS、GST-π、TopoⅡ及Ki-67在乳腺癌的表达中存在一定的相关性,联合上述指标检测对乳腺癌患者的临床诊疗及预后具有重要意义。     

HER2、P53及多药耐药基因在乳腺癌组织中的表达

目的探讨凋亡相关基因HER2、P53在乳腺癌中的表达,及其与多药耐药基因P-gp、GST-π的关系。方法用Enivision免疫组织化学方法对66例未经化疗的乳腺癌手术切除标本进行HER2、P53及P-gp、GST-π的检测。结果乳腺癌组织中P53及P-gp、GST-π的阳性表达率各为50.0%、40.9%及42.4%,HER2的过度表达率为27.3%;乳腺癌中P-gp的表达与HER2的过度表达及P53、GST-π的阳性表达均呈正相关;HER2的过度表达与P53的表达具有相关性。结论凋亡相关基因HER2、P53过表达可能通过凋亡抑制作用,共同参与了乳腺癌的多药耐药。     

温下方含药血清对肺腺癌耐药细胞内GSH、GST-π的影响

目的:研究温下方含药血清对肺癌耐药细胞内谷胱苷肽(GSH)、谷胱苷肽转移酶-π(GST-π)及顺铂(DDP)含量的影响。方法:实验动物分为3组,灌服给药,制备温下方大剂量含药血清,温下方小剂量含药血清,正常血清。又将细胞分为4组,DDP干预组,大剂量含药血清+DDP干预组,小剂量含药血清+DDP干预组,正常血清+DDP干预组,分别孵育人肺腺癌耐药细胞株(A549/DDP)24h后,检测细胞内GSH含量及GST-π的表达,细胞内顺铂浓度。结果:A549/DDP细胞经温下方大、小剂量含药血清作用后,与对照组比较,细胞内GSH含量降低至3.55±0.65,3.54±0.74nmol/106(P<0.01);GST-π表达分别降低至1.64±0.08,1.63±0.09(P<0.05);细胞内铂含量分别增高至89.34±11.65,78.78±10.19(P<0.05)。结论:温下方含药血清能降低肺腺癌耐药细胞内GSH含量及GST-π的表达,提高耐药细胞内铂含量,从而增强耐药细胞对DDP的敏感性而逆转耐药。     

π型钢板内固定加植骨术治疗中青年桡骨远端粉碎性骨折

目的 探讨π型钢板内固定加植骨术治疗中青年桡骨远端严重粉碎性骨折的效果.方法 2005年1月至2008年5月收治并获得随访的中青年桡骨远端严重粉碎性骨折21例,根据AO分型:A3型5例,C2型7例,C3型9例.术前掌倾角为-34°～21°,平均-15°;尺偏角-10°-21°,平均14.5°;桡尺骨相对长度-2.0～0.5 cm,平均-1.2 cm.均采用π型钢板内固定加自体髂骨移植术,术后平均石膏托外固定6周后行功能锻炼.术后摄X线片观察骨折愈合情况,测量术前、术后掌倾角、尺偏角及桡尺骨远端相对长度.结果 术后随访9～18个月,平均13.5个月;骨折愈合时间3～8个月,平均6.2个月;术后掌倾角为8°～170°,平均13.2°;尺偏角为16°～29°,平均22.7°;桡尺骨相对长度为0.9～1.6 cm,平均1.3 cm.骨折愈合拆除内固定后:前臂旋前60°～87.,平均75.0°;旋后72°～97°,平均87.7°.术后腕关节功能采用Gartlant和Werley标准评分:优13例,良6例,可2例,优良率为90.5%,未出现肌腱断裂、感染、骨不连等并发症.结论 π型钢板内固定加自体骨移植术是治疗中青年桡骨远端粉碎性骨折的一种有效方法.     

Standardization of Tc-99 by two methods and participation at the CCRI(II)-K2. Tc-99 comparison

The work accomplished within the participation at the 2012 key comparison of Tc-99 is presented. The solution was standardized for the first time in IFIN-HH by two methods: LSC-TDCR and 4π(PC)β-γ efficiency tracer. The methods are described and the results are compared. For the LSC-TDCR method, the program TDCR07c, written and provided by P. Cassette, was used for processing the measurement data. The results are 2.1% higher than when applying the TDCR06b program; the higher value, calculated with the software TDCR07c, was used for reporting the final result in the comparison. The tracer used for the 4π(PC)β-γ efficiency tracer method was a standard ⁶⁰Co solution. The sources were prepared from the mixture ⁶⁰Co+⁹⁹Tc solution and a general extrapolation curve, type: N_βTc−99/(M)_Tc−99=f [1−ε_Co−60], was drawn. This value was not used for the final result of the comparison. The difference between the values of activity concentration obtained by the two methods was within the limit of the combined standard uncertainty of the difference of these two results.