白细胞介素-18通过诱导肿瘤细胞凋亡抑制人肺腺癌细胞皮下移植瘤的生长

目的：探讨白细胞介素-18（IL-18）对人肺癌裸鼠皮下移植瘤生长的影响及抗肿瘤机制。方法：采用荷人肺腺癌A549细胞的裸鼠皮下移植瘤模型,不同剂量（5μg/100μl、50μg/100μl）的IL-18进行腹腔内注射,对照组为磷酸盐缓冲液（PBS溶液）,观察瘤细胞生长能力和裸鼠生存期,应用光学显微镜观察肿瘤组织形态学变化,TUNEL法观察肿瘤细胞凋亡情况。结果：与对照组比较,IL-18高剂量组和IL-18常规剂量组明显抑制了皮下移植瘤生长（P〈0.05）。IL-18常规剂量组生存期（63±8天）明显延长（P〈0.05）,IL-18高剂量组（44±5天）与空白对照组（42±6天）生存期无明显差异（P〉0.05）。IL-18常规剂量治疗组和IL-18高剂量治疗组肿瘤组织内见大量淋巴细胞及炎细胞浸润,可见肿瘤细胞点、片状坏死;IL-18高剂量组和IL-18常规剂量组的凋亡细胞数均明显高于空白对照组（P〈0.01）。结论：IL-18在裸鼠体内具有明显的抗肿瘤作用,其机制可能是刺激淋巴细胞、NK细胞和吞噬细胞等炎细胞分泌各种细胞因子,诱导肿瘤细胞凋亡,发挥抗肿瘤作用。     

IL-27促进人胰腺癌Aspc1细胞凋亡

目的:探讨IL-27基因对人胰腺癌Aspc1细胞凋亡的影响及其体内抗肿瘤作用.方法:重组载体PA317/IL-27转染Aspc1细胞,G418筛选稳定转染IL-27基因的Aspc1细胞(Aspc1/IL-27).ELISA、细胞计数法和流式细胞术分别检测IL-27对Aspc1细胞IL-27表达、细胞增殖和MHC-Ⅰ类分子表达的影响.将Aspc1/IL-27、Aspc1/LXSN(稳定转染空质粒的Aspc1细胞)和Aspc1细胞接种于裸鼠右背部皮下,观察Aspc1细胞移植瘤的生长情况和小鼠的生存期;TUNEL法检测移植瘤细胞的凋亡,电镜观察移植瘤细胞的超微结构变化.结果:成功建立稳定转染PA317/IL-27载体的Aspc1/IL-27细胞株.Aspc1/IL-27细胞高表达IL-27,而Aspc1/LXSN和Aspc1细胞不表达IL-27(P＜0.01).PA317/IL-27载体转染不影响Aspc1细胞表面MHC-Ⅰ类分子的表达(P＞0.05).Aspc1/IL-27组裸鼠移植瘤生长速度明显慢于Aspc1/LXSN组及Aspc1组(P＜0.05),且生存期延长(P＜0.05).Aspc1/IL-27组移植瘤细胞凋亡率明显高于Aspc1/LXSN和Aspc1组[(19.5±2.4)%vs(8.5±0.3)%、(9.1±0.8)%,P＜0.01].结论:IL-27基因转染胰腺癌Aspc1细胞后通过诱导肿瘤细胞凋亡发挥抗肿瘤作用.     

IL-15联合CIK细胞治疗裸鼠肾癌移植瘤的实验研究

[目的]探讨白细胞介素-15(IL-15)联合CIK细胞治疗裸鼠肾癌移植瘤的效果及其作用机制。[方法]建立裸鼠肾癌皮下移植瘤模型,采用析因设计方法,随机分4组,Ⅰ组对照组(n=8),瘤旁注射生理盐水0.2ml/只;Ⅱ组(n=8),瘤旁注射CIK细胞0.2ml/只(约3×107个CIK细胞);Ⅲ组(n=8),瘤旁注射IL-15 0.2ml/只(约100μg/kg);Ⅳ组(n=8),瘤旁注射IL-15 0.2ml/只(约100μg/kg)和CIK细胞0.2ml/只(含约3×107个CIK细胞),注射方案:1次/周,连续3周。观察裸鼠生存期、生存延长率及肿瘤生长曲线。待裸鼠死亡后,观察移植瘤细胞凋亡率,NK细胞群计数;测定裸鼠脾脏重量;对裸鼠移植瘤常规病理学检查。[结果]实验组与对照组相比荷瘤裸鼠生存延长率,脾脏重量,移植瘤细胞凋亡率,NK细胞群计数均有明显差异。病理学检查示CIK组、IL-15组与对照组肿瘤细胞形态上无明显差别,可见少量肿瘤坏死,但联合治疗组可见较多肿瘤坏死,肿瘤细胞周围及肿瘤内有大量淋巴细胞浸润。[结论]IL-15联合CIK细胞对裸鼠肾癌移植瘤生长有明显的抑制作用,且较IL-15或者CIK细胞单一治疗效果更好。其机制可能与IL-15诱导CIK细胞(含NK细胞、NK-T细胞及CD8+记忆T细胞)的发育、增殖及活化,进一步促进机体免疫细胞活性及细胞因子反应,免疫性增强有关。     

白桦脂酸对人宫颈癌裸鼠移植瘤的抑制作用及机制

目的 探讨白桦脂酸（BA）对人宫颈癌HeLa细胞株裸鼠皮下移植瘤生长的抑制作用及其机制。方法 将4×10⁶个HeLa细胞接种于裸鼠右肩背部皮下,建立人宫颈癌裸鼠皮下移植瘤模型,24只荷瘤裸鼠随机分为BA高剂量（80mg／kg）、中剂量（40mg／kg）、低剂量（20mg／kg）组及空白对照组（含溶剂）,每组6只,隔日腹腔注射连续给药21d,停药24 h后处死裸鼠,测量裸鼠体重、移植瘤体积、瘤重,计算抑瘤率;光镜下观察移植瘤组织形态学变化;TUNEL法检测肿瘤细胞凋亡指数;免疫组化法检测瘤组织内caspase-3、CytoC蛋白表达。结果 裸鼠处死后,BA处理组的移植瘤体积均明显小于空白对照组（P＜0.01）,其中高、中、低剂量组抑瘤率分别为56.2％、40.4％和24.6％ （P＜0.01）;HE染色法显示BA处理组小鼠的移植瘤组织出现明显凋亡及坏死改变;TUNEL检测对照组和BA低、中、高剂量组的凋亡指数分别为（8.36±2.78）％、（20.98±3.01）％、（28.74±4.77）％和（39.34±6.15）％（P＜0.05）;免疫组化法示BA处理组的肿瘤组织caspase-3、CytoC蛋白表达水平较空白对照组明显升高（P＜0.01）。结论 BA对人宫颈癌HeLa细胞移植瘤的生长具有明显的抑制作用,其机制可能与上调caspase-3、CytoC蛋白的表达及诱导细胞凋亡有关。     

纽卡斯尔病毒疫苗和白细胞介素-12对荷人卵巢癌裸鼠模型作用的实验研究

目的:探讨纽卡斯尔病毒疫苗(ATV-NDV)和白细胞介素-12(IL-12]对3AO裸鼠皮下移植瘤的影响及其作用机制.方法:建立3AO裸鼠移植瘤模型,随机分为4组,每组10只.Ⅰ组注射ATV-NDV(0.2 mL);Ⅱ组注射IL-12(100 ng/kg);Ⅲ组注射IL-12(100 ng/kg)加ATV-NDV(0.2 mL);Ⅳ组为对照组,腹腔注射生理盐水0.2 mL;观察各组裸鼠成瘤率、生存期和生存延长率及肿瘤生长曲线.流式细胞术(FCM)观察裸鼠移植瘤细胞凋亡率及细胞周期,双标记计数NK细胞比例;称取裸鼠脾脏质量;移植瘤瘤体及各组裸鼠肝、脾、肾行组织病理学变化检查.结果:治疗组在荷瘤裸鼠生长延长率,裸鼠移植瘤细胞凋亡率,NK细胞群计数,裸鼠脾脏重量方面明显高于对照组,Ⅲ组高于Ⅰ组和Ⅱ组.组织病理学检查各治疗组中均可见有肿瘤坏死,肿瘤内及周围有明显的淋巴细胞浸润.结论:ATV-NDV和IL-12对人卵巢癌裸鼠皮下移植瘤具有明显的抑制作用.IL-12可增强ATV-NDV对卵巢癌的抑制作用.     

Survivin基因沉默抑制结肠癌生长的动物实验研究

目的 探究survivin基因沉默对人结肠癌Lovo细胞裸鼠移植瘤生长的抑制作用.方法 构建靶向survivin的shRNA载体SUR和阴性对照质粒Neg,并将其转染人结肠癌Lovo细胞,分别种植到裸鼠皮下建立人结肠癌裸鼠移植瘤模型.随后观察各组裸鼠移植瘤生长情况,免疫组化方法检测移植瘤survivin蛋白的表达,TUNEL法检测肿瘤细胞的凋亡情况.结果 移植转染细胞8周,与空白对照组比较,SUR组移植瘤的体积和质量均有显著缩小(P<0.05),体积和质量抑瘤率分别为48.9%和51.2%.与空白对照组比较,SUR组移植瘤survivin表达显著下调,表达指数为31.9%;SUR组肿瘤细胞凋亡显著增加,凋亡指数18.47%(P<0.05).阴性对照Neg组的上述指标与空白对照组比较,差异均无统计学意义.结论 Survivin基因沉默能够抑制人结肠癌Lovo细胞裸鼠移植瘤的生长.     

喷他脒对卵巢癌SKOV3细胞抑制作用的体内体外研究

目的探讨喷他脒对人卵巢癌SKOV3细胞株及卵巢癌SKOV3细胞株裸鼠皮下移植瘤的抑制作用。方法通过MTT法测定卵巢癌细胞生长抑制率,流式细胞仪检测细胞凋亡率;建立人卵巢癌SKOV3细胞裸鼠转移瘤模型,按不同剂量喷他脒给药,观察并记录各组裸鼠及其皮下移植瘤的生长情况,计算肿瘤体积和肿瘤生长抑制率。结果经不同浓度的喷他脒处理后,卵巢癌SKOV3细胞生长明显受到抑制,且这种抑制作用呈时间及浓度依赖性,凋亡率增加。在卵巢癌裸鼠皮下移植瘤动物模型中,喷他脒能够明显抑制移植瘤的生长,且呈剂量依赖改变,高剂量的10 mg/kg组喷他脒对肿瘤抑制作用更明显。结论 (1)喷他脒可以抑制卵巢癌细胞的增殖及诱导凋亡。(2)高、中、低3种喷他脒给药剂量对荷瘤裸鼠无明显毒性作用。(3)喷他脒对荷瘤裸鼠皮下移植瘤的生长有抑制作用,并呈剂量依赖。     

靶向p65基因的miRNA对人三阴性乳腺癌细胞裸鼠移植瘤生长的抑制作用

背景与目的:三阴性乳腺癌(triple-negative breast cancer,TNBC)是乳腺癌中预后较差的一个亚型,如何防治TNBC的快速生长成为近几年临床研究的热点之一。NF-κB信号通路在肿瘤发生、发展的各个环节中扮演重要角色,有望成为肿瘤基因治疗新的方向。本研究通过建立人TNBC裸鼠移植瘤模型,观察靶向沉默NF-κB p65亚基的微小RNA(microRNA,miRNA)治疗对TNBC裸鼠移植瘤生长及凋亡的影响,并初步探讨其可能的作用机制。方法:建立人TNBC细胞株MDA-MB-231裸鼠移植瘤动物模型,瘤旁注射p65miRNA质粒(p65miRNA组),同时以注射Neg-miRNA质粒和PBS作为Neg-miRNA对照组和空白对照组。监测肿瘤生长变化,测量肿瘤质量。流式细胞术(flow cytometry,FCM)检测肿瘤细胞凋亡的变化。免疫组化法检测肿瘤组织中p65的表达。Western blot法检测肿瘤组织中Bcl-2和Bax蛋白的表达水平。结果:经p65miRNA处理后,裸鼠肿瘤的生长受到明显抑制。FCM结果表明,p65miRNA组肿瘤细胞凋亡率为(31.08±3.52)%,明显高于Neg-miRNA组(5.76±1.02)%和空白对照组(4.29±0.86)%(P<0.05)。此外,p65miRNA组裸鼠肿瘤组织p65和Bcl-2的蛋白表达明显下调,Bax的蛋白表达显著上调。结论:p65miRNA能抑制人TNBC裸鼠皮下移植瘤的生长,且在体内可诱导肿瘤细胞凋亡。     

穿心莲内酯体内诱导人胃癌BGC823细胞凋亡作用及机制探讨

目的:探讨穿心莲内酯的体内抗肿瘤作用和诱导肿瘤细胞凋亡的机制。方法:选取体质量18～20g的6周龄雌性BALB/C裸鼠制备裸鼠移植瘤模型,用400、200和100mg/(kg.d)穿心莲内酯进行体内药敏实验,测定肿瘤生长抑制率,透射电镜形态学观察,RT-PCR和免疫组织化学检测Caspase-3、Bcl-2和Bax的表达。结果:穿心莲内酯对裸鼠移植瘤有明显的抑瘤效应,低剂量组的抑瘤率为22.2%(P=0.029),中剂量组为44.7%(P=0.009),高剂量组为57.8%(P=0.007),且抑瘤率随剂量增加逐渐增高。光镜和电镜下可见细胞凋亡形态改变。穿心莲内酯低、中、高剂量分别作用14d后,Caspase-3水平均逐渐增加,与阴性对照组(0.71±0.14)比较,低剂量为1.04±0.19(P=0.034),中剂量为1.55±0.34(P=0.008),高剂量为1.89±0.36(P=0.005),并呈剂量依赖性关系;同时,随着药物剂量的增加,肿瘤细胞质的Bax蛋白表达逐渐增加,与阴性对照组(0.179±0.042)比较,低剂量为0.248±0.055(P=0.04),中剂量为0.310±0.051(P=0.032),高剂量为0.337±0.050(P=0.021);Bcl-2蛋白表达逐渐降低,与阴性对照组(0.353±0.066)比较,低剂量为0.291±0.032(P=0.035),中剂量为0.241±0.036(P=0.024),高剂量为0.218±0.042,P=0.018。结论:穿心莲内酯对裸鼠移植瘤有显著的抗肿瘤作用,其抗肿瘤机制可能与下调Bcl-2表达、上调Bax表达、引起Caspase-3的活化进而诱导细胞凋亡有关。     

重组腺病毒Ad5F35-SH2-DED对K562细胞裸鼠致瘤能力的影响

目的:研究融合蛋白SH2-DED(SD)对白血病K562细胞裸鼠皮下移植瘤的影响.方法:建立K562细胞裸鼠皮下移植瘤的重组腺病毒预防和治疗模型.预防模型采用皮下注射经重组腺病毒Ad5F35-SD或Ad5F35-SmD预处理的K562细胞;治疗模型采用皮下注射K562细胞建立皮下移植瘤后,进行Ad5F35-SD或Ad5F35-SmD的瘤体内多点注射.观察裸鼠移植瘤的生长情况以及移植瘤肿瘤细胞的形态学变化.应用TUNEL法和电子显微镜观察移植瘤肿瘤细胞的凋亡情况.结果:治疗模型组中,Ad5F35-SD处理组移植瘤体积明显缩小,肿瘤细胞核浓缩,细胞质染色加深.TUNEL法和电子显微镜检测结果提示,肿瘤细胞发生凋亡,且凋亡相关蛋白caspase-3和caspase-8表达上调.Ad5F35-SD在预防模型组中同样具有抑制移植瘤生长的作用.结论:重组腺病毒Ad5F35-SD能够抑制K562细胞在裸鼠体内的致瘤能力以及裸鼠皮下移植瘤的生长,并促进肿瘤细胞凋亡.     

Experimental Study of Endostar Injection Concomitant with Cryoablation on Lung Adenocarcinoma A549 Xenografts

Objective: To explore the inhibiting effect and mechanism of Endostar injection concomitant with cryoablationon lung adenocarcinoma A549 xenografts in nude mice. Materials and Methods: A total of 24 nude mice withsubcutaneous xenografts of the A549 cell line were established and divided into 4 groups when the maximaldiameters of tumors became 1 cm: control group, Endostar group, cryoablation group and combination group(Endostar concomitant with cryoablation). The nude mice were sacrificed after 21-days treatment, tumourtissues were removed to measure their volume, in situ test of TdT-mediated dUTP nick end labeling (TUNEL)was adopted to determine the cellular apoptosis around freezing injury zones, and immunohistochemical SPtest was applied for the detection of micro-vessel density (MVD) and vascular endothelial growth factor (VEGF)expression levels. Results: At 21-days after treatment, the growth velocities of control group, Endostar group,cryoablation group and combination group were 236.7±51.2%, 220.0±30.6%, 159.5±29.3% and 103.3±25.5%(P<0.01), while cellular apoptosis rates of tumors were 21.7±2.34%, (22.17±1.47)%, 38.3±1.37% and 49.2±1.72%,(P<0.01), respectively, according to the immunohistochemical test. MVD and VEGF expression levels in thecombination group were both lower than in other groups (P<0.01), also being positively related (r=0.925, P<0.01).Conclusions: Endostar can significantly improve the inhibitory effects of cryoablation on xenografts of lungadenocarcinoma A549, and the mechanism is probably associated with its function as an inhibitor of tumourneo-angiogenesis through down-regulating VEGF expression.     

HIF-1α基因沉默对人肺腺癌细胞A549裸鼠移植瘤生长及survivin表达的影响

目的观察缺氧诱导因子-1α（HIF-1α）基因沉默对肺癌的抑瘤效应和survivin表达的影响。方法将实验用肺腺癌A549细胞分为空白对照组、无意义序列转染组和实验组,接种裸鼠,建立裸鼠荷瘤模型,观测HIF-1α-MiRNA对裸鼠皮下移植瘤的生长抑制作用和对survivin表达的影响。采用免疫组化SP法,检测HIF-1α和survivin蛋白在裸鼠移植瘤中的表达。采用逆转录聚合酶链反应（RT-PCR）法检测HIF-1α和survivin mRNA的表达。采用原位末端标记（TUNEL）法检测肿瘤组织中细胞凋亡。结果实验组裸鼠肿瘤的生长速度较空白对照组、无意义序列转染组明显减慢（P〈0.05）。接种60 d后处死裸鼠,实验组裸鼠的肿瘤重量为（0.59±0.28）g,明显轻于空白对照组[（1.90±0.18）g]和无意义序列转染组[（1.66±0.24）g,P〈0.01]。实验组肿瘤组织中HIF-1αmRNA和蛋白的相对表达量分别为（0.45±0.04）%和（24.56±5.83）%,survivin mRNA和蛋白的相对表达量分别为（0.32±0.02）%和（29.08±3.99）%,均明显低于空白对照组、无意义序列转染组（P均〈0.05）。但实验组肿瘤组织中凋亡细胞的数量显著高于对照组。结论以HIF-1α为靶点的基因治疗,可能通过下调靶基因survivin的表达促进肺癌细胞凋亡,发挥抑制肿瘤生长的作用。     

VSV-MP gene therapy strategy inhibits tumor growth in nude mice model of human lung adenocarcinoma

Vesicular stomatitis virus (VSV) matrix protein (MP) can induce in vitro apoptosis of tumor cells in the absence of other viral components. Here, the antitumor activity of VSV-MP against lung adenocarcinoma was investigated in vivo. A pVAX-plasmid DNA encoding VSV-MP and control empty vectors (pVAX) were constructed and wrapped-up with liposome. A549 and Spc-A1 human lung adenocarcinoma cells were transfected with liposomal-VSV-MP (Lip-MP) or Lip-pVAX and then examined for cell viability or apoptosis using Hoechst/propidium iodide staining by flow cytometry, and further demonstrated by caspase/poly ADP-ribose polymerase (PARP) cleavage analysis. For the in vivo study, A549 and Spc-A1 lung carcinoma models in nude mice were established and randomly assigned into three groups to receive eight 2-weekly intravenous administrations of medium alone as control, Lip-pVAX or Lip-MP, respectively. Subsequently, Lip-MP significantly reduced tumor growth and prolonged the survival of tumor-bearing mice compared with Lip-pVAX and control agents (P<0.05), with much higher apoptosis index of both in vivo and in vitro tumor cells, respectively (P<0.05). In addition, in vivo antitumoral effect was associated with natural killer-(NK) cell congregation without evidence of toxicity. These observations suggest that systemically delivering Lip-MP has a specific dual antitumor activity in human lung adenocarcinoma by inducing apoptosis and possibly stimulating NK-cell responses, it may provide a clue for developing new therapeutic approaches against human lung adenocarcinoma.     

熊果酸对人肝癌SMMC-7721裸鼠移植瘤抑制作用的观察

目的 观察熊果酸对人肝癌SMMC-7721裸小鼠移植瘤生长的抑制作用及其强度,为本药的进一步临床应用研究提供基础数据.方法 采用荷瘤裸小鼠作为移植性肿瘤实验动物模型.将裸鼠随机分为3组,每组8只,分别为阴性对照组、环磷酰胺阳性对照组和熊果酸组.阳性对照组给予环磷酰胺20mg/kg,熊果酸组给药剂量为4.5mg/kg,阴性对照组给予等量无菌注射用水,每日一次腹腔注射,连续14天.给药期间定期测定动物体重和瘤体积.实验结束后处死裸鼠,取出瘤体称重,计算肿瘤抑制率.结果 给药期间动物一般状况未见明显改变,饮食未见异常,体重较实验前有所增加.熊果酸组瘤体积缩小,瘤株抑瘤率达53.7%,阳性对照组的抑瘤率为39.2%,两组与阴性对照组比较,均有显著差异(P<0.05).熊果酸组和阳性对照组的相对肿瘤体积(RTV)分别为33.16±22.36,21.61±12.88,明显低于阴性对照组(62.09±32.80)(P<0.05),两组的相对肿瘤增殖率均小于60%.结论 熊果酸对人肝癌SMMC-7721裸小鼠移植瘤有明显的抑制作用.     

裸鼠肺癌移植瘤中NRP-1的表达及其意义

Objective:To establish angiogenesis model of xenografts of lung cancer cell in nude mouse and investigate the expression of the neuropilin-1 (NRP-1) protein in tumors and its role in progression and angiogenesis of lung cancer.Methods:Human lung adenocarcinoma cells A549 were analyzed for the expression of vascular endothelial growth factor165(VEGF165)mRNA using RT-PCR in vitro.TWo groups of nude mice were subcutaneously inoculated with A549 at different tumor-loading time.Two groups of xenografts were jdentified by hematoxylin and eosin (HE) staining.their microvessel density (MVD) were analyzed meanwhile.Two groups were analyzed for the expression of NRP-1 protein and their mean absorbency by using immunohistochemistry and automatic image analysis system respectively.Results:A549 expressed VEGF165 mRNA,and xenografts of A549 in nude mice were successfully established and confirmed by HE staining.The atypia of cancer cells and angiogenesis were occurred in two groups.Two groups of MVD were 13.06±1158.23.61±3.11(vessels/mm2)(P＜0.01).NRP-1 protein was expressed in cytoplasm of vascular endothelium cells and partial tumor cells.Two groups of mean absorbency of NRP-1 were 0.1095±O.0228,0.1784±0.0151 (P＜0.01).Conclusion:The angioqenesis models of xenografts in nude mice with lung cancer cell A549 expressing VEGF165 mRNA at different tumor-loading times were established successfully.The expression of NRP-1 protein and MVD were increased with the tumor progression.Our results demonstrate that NRP-1 protein in lung cancer is related to angiogenesis.     

Enhanced efficacy of radiation-induced gene therapy in mice bearing lung adenocarcinoma xenografts using hypoxia responsive elements

The aim of the present study was to investigate whether the hypoxia responsive element (HRE) could be used to enhance suicide gene (HSV-tk) expression and tumoricidal activity in radiation-controlled gene therapy of human lung adenocarcinoma xenografts. A chimeric promoter, HRE-Egr, was generated by directly linking a 0.3-kb fragment of HRE to a 0.6-kb human Egr-1 promoter. Retroviral vectors containing luciferase or the HSV-tk gene driven by Egr-1 or HRE-Egr were constructed. A human adenocarcinoma cell line (A549) was stably transfected with the above vectors using the lipofectamine method. The sensitivity of transfected cells to prodrug ganciclovir (GCV) and cell survival rates were analyzed after exposure to a dose of 2 Gy radiation and hypoxia (1%). In vivo, tumor xenografts in BALB/c mice were transfected with the constructed retroviruses and irradiated to a total dose of 6 Gy, followed by GCV treatment (20 mg/kg for 14 days). When the HSV-tk gene controlled by the HRE-Egr promoter was introduced into A549 cells by a retroviral vector, the exposure to 1% O(2) and 2 Gy radiation induced significant enhancement of GCV cytotoxicity to the cells. Moreover, in nude mice bearing solid tumor xenografts, only the tumors infected with the hybrid promoter-containing virus gradually disappeared after GCV administration and radiation. These results indicate that HRE can enhance transgene expression and tumoricidal activity in HSV-tk gene therapy controlled by ionizing radiation in hypoxic human lung adenocarcinoma.     

表皮生长因子受体单克隆抗体抗肺癌作用的研究

目的 实验观察表皮生长因子受体单克隆抗体（ＥＧＦＲ ＭcＡb）egf／r３对肺癌的治疗 作用。方法 体外细胞增殖抑制实验采用ＭＴＴ法,裸鼠体内移植瘤采用同时治疗（Ｔ１组）与一治疗（Ｔ２组）两种方案。结果 egf／r３ＭcＡb对高表达ＥＧＦＲ的ＳＰＣ－Ａ１和Ａ５４９肺癌细胞体外均具有增殖抑制作用,并呈剂量依赖性;以ＳＰＣ－Ａ１进行裸鼠皮下移植体内实验,至治疗结束,Ｔ１组与５０％成瘤（３/６）,对照组１００％成瘤（     

抗表皮生长因子受体对人肺腺癌小鼠移植瘤的放射增敏研究

目的 观察抗表皮生长因子受体药物(吉非替尼)在人肺腺癌移植瘤中有无放射增敏作用.方法 用人肺腺癌细胞A549建立移植瘤裸鼠模型,分别隔天测苗肿瘤在对照、单纯照射、单纯药物(吉非蒋尼)、照射+药物作用下(6只/组)的直径.描绘肿瘤生长曲线,计算局部肿瘤生艮抑制率、肿瘤牛长延缓时问和再牛长延缓时间.照射为5 Gy/次,1次/d,连续3 d.吉非替尼为罐胃100ms/kg,1次/d,连续14 d.结果 单纯照射、单纯吉非替尼、照射+吉非替尼的肿瘤牛长抑制率分别为22.7%、12.4%与38.2%(F=25.75,P=0.000);肿瘤生长延缓时间分别为6.0、7.8、21.6 d(F=70.49,P=0.000).照射+古非替尼、单纯照射的再牛长延缓时间分别为23.4、10.2 d(F=174.24,P=0.000).肿瘤牛长延缓的增敏比为1.5,冉生长延缓的增敏比为1.7.结论 吉非替尼对人肺腺癌小鼠移植瘤有明显的放疗增敏作用.     

Endostar, a recombined humanized endostatin, enhances the radioresponse for human nasopharyngeal carcinoma and human lung adenocarcinoma xenografts in mice

The purpose of this paper is to determine the efficacy of combining radiation therapy with endostar, a recombined humanized endostatin, in human nasopharyngeal carcinoma and human lung adenocarcinoma xenografts. Tumor xenografts were established in the hind limb of male athymic nude mice (BALB/c-nu) by subcutaneous transplantation. The tumor-bearing mice were assigned into four treatment groups: sham therapy (control), endostar (20 mg/kg, once daily for 10 days), radiation therapy (6 Gray per day to 30 Gray, once a day for 1 week), and endostar plus radiation therapy (combination). The experiment was repeated and mice were killed at days 3, 6, and 10 after initiation therapy, and the tumor tissues and blood samples were collected to analyze the kinetics of antitumor, antiangiogenesis, and antivascularization responses of different therapies. In human nasopharyngeal carcinoma and human lung adenocarcinoma xenografts, endostar significantly enhanced the effects of tumor growth inhibition, endothelial cell and tumor cell apoptosis induction, and improved tumor cell hypoxia of radiation therapy. Histological analyses demonstrated that endostar plus radiation also induced a significant reduction in microvascular density, microvascular area, and vascular endothelial growth factor and matrix metalloproteinase-2 expression compared with radiation and endostar alone respectively. We concluded that endostar significantly sensitized the function of radiation in antitumor and antiangiogenesis in human nasopharyngeal carcinoma and human lung adenocarcinoma xenografts by increasing the apoptosis of the endothelial cell and tumor cell, improving the hypoxia of the tumor cell, and changing the proangiogenic factors. These data provided a rational basis for clinical practice of this multimodality therapy. ( Cancer Sci 2009)