重组白介素-12治疗小鼠Lewis肺癌的实验研究

背景与目的:白介素-12(interleukin-12,IL-12)是具有抗瘤活性的细胞因子,本研究建立稳定表达小鼠IL-12(murineinterleukin-12,mIL-12)的小鼠Lewis肺癌(Lewislungcarcinoma,LLC)细胞系LLC/mIL-12,评估mIL-12重组质粒及LLC/mIL-12瘤苗治疗小鼠Lewis肺癌移植瘤的疗效。方法:脂质体转染LLC获得LLC/mIL-12瘤苗。于C57BL/6小鼠皮下接种LLC细胞2×106个,成瘤后将小鼠随机分成4组(n=10),第1、4、7天瘤内注射质粒或瘤苗,第14天处死小鼠,观察肿瘤生长曲线、脾细胞中CTL细胞和NK细胞活性以及肿瘤浸润淋巴细胞。结果:LLC/mIL-12瘤苗组和pcDNA3.1( )-mIL-12质粒组肿瘤体积显著缩小,mIL-12能增强NK细胞和CTL细胞活性,两者均以LLC/mIL-12治疗组更显著,LLC/mIL-12和pcDNA3.1( )-mIL-12治疗组有大量CD4 、CD8 淋巴细胞浸润。结论:mIL-12基因能增强NK细胞和CTL活性,LLC/mIL-12及pcDNA3.1( )-mIL-12均能产生抗瘤免疫反应,且前者作用更强。     

CD4+CD25+调节性T细胞对晚期肺癌患者免疫抑制作用的研究

目的 探讨Treg及Th1/Th2类细胞因子在晚期肺癌肿瘤免疫抑制中的作用.方法 选取100例初治晚期肺癌患者及50例健康自愿者.采用流式细胞术检测其外周血中Treg、Th1类细胞因子(IFN-γ、IL-2、TNF-a)、Th2类细胞因子(IL-4、IL-6、IL-10)水平,同时分析CD4+CD25+Treg与Th1/Th2类细胞因子之间的相关性.结果 ①晚期肺癌患者外周血中Treg为(11.12±5.83)%,高于健康对照组(7.46±3.07)%,差异有统计学意义(P=0.003);②化疗前肺癌患者外周血中Treg为(11.12±5.83)%,明显高于化疗后(6.45±3.74)%,差异有统计学意义(P<0.001);③晚期肺癌患者与正常对照组Th1/Th2类细胞因子水平分别为:IFN-γ(8.56±3.62 vs 10.79±3.27,P=0.049)、IL-2(8.48±2.87 vs 10.22±4.03,P=0.03)、TNF-a(6.18±2.67vs8.14±2.87,P=0.007)、IFN-γ/IL-4(3.33±1.44 vs 4.09±1.00,P=0.028)、IL-4(3.17±1.19 vs 2.45±0.43,P<0.001)、IL-6(3.88±2.08 vs 2.33±0.88,P<0.001)、IL-10(3.64±1.73 vs 2.54±1.08,P=0.008),其中Th2类因子水平明显升高,差异有统计学意义(P均<0.05);④CD4+CD25+Treg与Th1类细胞因子IFN-γ、TNF-a、IL-2及IL-6无相关性(P均>0.05);与Th1/Th2(γ=-0.273,P=0.003)呈负相关;与Th2类细胞因子IL-4(γ=0.237,P=0.009)、IL-10(0.626,P<0.001)呈正相关(P均<0.05).结论 晚期肺癌患者CD4+CD25+Treg、Th2类细胞因子水平显著升高,Th1类细胞因子水平下降,它们共同导致肿瘤患者免疫抑制及肿瘤进展,监测其水平变化有助于判断肺癌患者疗效、预后,有效调控CD4+CD25+Treg及负性细胞因子水平可能是治疗肺癌的一个新策略.     

肺癌患者肿瘤浸润淋巴细胞中IL-17的分布特征及临床意义

目的:探讨肺癌患者肿瘤浸润淋巴细胞中IL-17的分布特征及其临床意义。方法:流式细胞术检测15例肺癌组织和15例配对远癌正常组织中浸润淋巴细胞的IL-17表达水平。结果:肺癌患者肿瘤组织浸润淋巴细胞中IL-17A显著高于远癌正常组织（P＜0.000 1）,肿瘤组织中浸润产生IL-17的CD3+CD4+T细胞（Th17）（P＜0.001）、CD3+CD8+T细胞（Tc17）（P＜0.001）、γδT细胞（γδT17）(P＜0.000 1)均高于远癌正常组织;肺癌患者肿瘤组织浸润Th17和Tc17水平无明显差异（P＞0.05）,而γδT17水平显著高于Th17（P＜0.001）和Tc17（P＜0.000 1）;肿瘤组织中浸润的γδT17表达水平和淋巴结转移相关（P＜0.05）。结论:IL-17和肺癌发生相关,其早期主要来源是肿瘤浸润的γδT细胞;γδT17数量与淋巴结转移有关,提示γδT17细胞可能参与肺癌病程的进展。     

IL-12瘤苗与131I-1E2 协同抗瘤作用研究

目的:建立稳定表达IL- 12的小鼠Lewis肺癌瘤苗LLC/mIL-12;评估尾静脉注射131I- 1E2（131I 标记抗肺癌单克隆抗体1E2）抑瘤效果及LLC/mIL-12对131I- 1E2 靶向治疗增效作用。方法:制备LLC/mIL-12;Na131I 标记1E2;建立C57BL/6 小鼠移植瘤模型,比较单纯尾静脉注射131I- 1E2 或联合瘤内注射LLC/mIL-12时131I- 1E2 在小鼠体内分布。成瘤小鼠随机分组,为GT、LLC/mIL-12）、RIT（Radioimmunotherapy,放射免疫治疗）、PBS 和GT+RIT组,治疗后测量肿瘤体积及重量,计算抑瘤率,检测CTL 和NK活性。结果:131I- 1E2 能有效靶向肿瘤组织,尤其联合LLC/mIL-12。与单用GT或RIT 比较,GT+RIT能有效地上调IL- 12表达、抑制肿瘤生长,GT及联合组有大量CD4+、CD8+淋巴细胞浸润,NK和CTL 细胞活性增强。联合组131I- 1E2 更多积聚在肿瘤组织。结论:131I- 1E2 明显抑制肿瘤生长,具有潜在的临床应用价值,有可能成为新的肿瘤靶向治疗药物。      

IL-12瘤苗联合放疗对小鼠Lewis肺癌作用研究

目的:建立稳定表达小鼠IL-12(Murine interleukin-12,mIL-12)的小鼠Lewis肺癌(Lewis lung carcino-ma,LLC)瘤苗LLC/mIL-12,评估瘤苗对荷鼠Lewis肺癌C57BL/6小鼠的放疗增敏作用。方法:重组质粒pcD-NA3.1( )-mIL-12用脂质体转染LLC,G418筛选后获得LLC/mIL-12瘤苗。C57BL/6小鼠皮下接种LLC细胞2×106,成瘤后将小鼠随机分成4组(n=10),第0、7、14d瘤苗组和联合组瘤内注射瘤苗,第1、3、5d放疗和联合组给予2Gy局部照射。第21d处死小鼠,观察肿瘤体积、脾细胞中CTL和NK活性以及肿瘤细胞凋亡。结果:联合组肿瘤体积显著缩小,NK和CTL活性增强,凋亡增加,与其它组相比,P<0.05;放疗组NK和CTL活性降低。结论:LLC/mIL-12瘤苗及放疗均能产生抗瘤反应,且联合组作用更强。瘤苗放疗增敏作用机制是诱导细胞凋亡,增强NK和CTL活性。     

胞嘧啶脱氨酶基因旁观者效应与宿主免疫状态关系

目的 :研究胞嘧啶脱氨酶自杀基因 (E .Coli.cytosingedeaminasegene ,EC CD)旁观者效应与宿主免疫状态的关系。方法 :CT2 6细胞分别接种于Balb/c小鼠及Balb/cnu/nu裸鼠皮下 ,每只动物接种相互分离的两处 ,在其中一处瘤体内接种AdCMVCD ,腹腔给予氟胞嘧啶 (5 fluorocytosine ,5 FC) ,观察肿瘤体积的变化。并用FCM检测肿瘤浸润淋巴细胞CD3、CD4、CD8的表达情况。结果 :Balb/c小鼠中 ,治疗组接种病毒侧瘤体积为 2 4 95 2± 898 6 5mm3 ,其对侧为 2 5 74 8± 339 0 5mm3 ,均明显小于对照组 (P =0 0 0 9,P =0 0 12 )。Balb/cnu/nu裸鼠中 ,治疗组接种病毒侧瘤体积为 2 4 32 6± 36 8 5 3mm3 ,明显小于对照组(P =0 0 15 ) ,而其对侧为 396 0 9± 12 80 76mm3 ,明显大于治疗组接种侧 (P =0 0 4 9) ,但与对照组两侧间均无差异。FCM显示Balb/cnu/nu裸鼠体内肿瘤浸润淋巴细胞主要是CD3+、CD4 +的淋巴细胞 ,而Balb/c小鼠体内肿瘤主要是CD3+、CD8+的淋巴细胞。结论 :EC CD/ 5 FC系统的旁观者效应特别是远距离旁观者效应与宿主免疫状况有关 ,在免疫健全宿主中旁观者效应较强。     

CD3和CD28单克隆抗体联合作用对CIK细胞及其亚群增殖及功能的影响

目的:探讨CD3和CD28单克隆抗体联合作用对细胞因子诱导的杀伤(cytokine-indueed killer,CIK)细胞及其亚群增殖及功能的影响.方法:采集2014年6月至2015年6月在郑州大学第一附属医院接受生物细胞治疗的20例肿瘤患者(肾癌6例,肺癌5例,肝癌、乳腺癌和恶性黑素瘤各2例,胆囊癌、淋巴瘤和卵巢癌各1例)的外周血,每例外周血均分为4组(对照组,单用CD3单抗组,单用CD28单抗组,CD3和CD28单抗联合作用组)进行CIK细胞的诱导培养.用CFSE染色检测CIK细胞的增殖能力;ELISA检测CIK细胞分泌细胞因子IFN-γ、TNF-α和IL-2的水平;磁珠分选CIK细胞亚群CD4+、CD8+和CD56+细胞,然后用ELISA检测对CIK细胞亚群分泌IFN-γ、TNF-α和IL-2能力的影响.结果:CD3/CD28单抗联合作用(PI =59.35)对CIK细胞的增殖能力的影响与单独使用CD3单抗(PI =64.4)相比效果并不明显,但是可以刺激CIK细胞分泌较高水平的IFN-γ和TNF-α[IFN-γ:(384.6 ±263.1)vs(201.5 ±271.5) pg/ml,P=0.0361;TNF-α:(4.795±1.251) vs(2.835±0.443) pg/ml,P=0.0265];进一步分析发现,两单抗的联合作用可增强亚群细胞CD8+分泌IFN-γ、CD56+分泌IL-2和TNF-α的活性,从而起到对淋巴细胞功能的增强作用.结论:CD3与CD28单抗联合作用不能增强CIK的增殖能力,但可以在一定程度上增强CIK细胞的功能,在肿瘤的细胞免疫治疗应用中具有一定的潜力.     

红景天提取物对Lewis肺癌小鼠移植瘤中CD4+CD25+Treg的抑制作用

目的： 观察红景天提取物（sachalin rhodiola rhizome extract,SRR）对Lewis肺癌小鼠移植瘤中CD4+CD25+调节性T细胞（regulatory T cell,Treg）的抑制作用,初步探讨其抑制肿瘤生长的机制。 方法： 建立小鼠Lewis肺癌移植瘤模型,随机分为3组：SRR组,紫杉醇（paclitaxel,PTX）阳性对照组和PBS组,记录各组小鼠移植瘤体积变化,计算抑瘤率并观察小鼠生存期。流式细胞术检测移植瘤组织中CD4+CD25+Foxp3+Treg的比例,荧光定量PCR 检测移植瘤组织中 Foxp3 和TGF-β mRNA的表达水平。 结果： 在建模第20天,SRR组小鼠移植瘤体积明显小于PBS组\[（719.6±2.4） vs （1030.5±3.1）mm3,P<005\],但与阳性对照PTX组无显著差异（P>0.05）。SRR组小鼠生存期较PBS组显著延长\[（36.0±1.0） vs （22.0± 2.0）d,P<0.01\],而与PTX组无显著差异（P>0.05）。SRR治疗组小鼠移植瘤组织中CD4+CD25+Foxp3+Treg占CD4+T细胞的比例显著低于PBS组\[（8.5±0.3）% vs （11.2±0.2）%,P<0.01\],但与PTX组无显著差异（P>0.05）。SRR组小鼠移植瘤组织中 Foxp3 mRNA \[（1.2±0.2) vs (2.1±0.2),P<0.05\]、TGF-β mRNA \[（1.2±0.1) vs (2.1±0.2),P<0.05\]表达均明显低于PBS组,而与PTX组无显著差异（P>0.05）。 结论： SRR可能通过下调肿瘤组织中CD4+CD25+Treg比例、 Foxp3 和TGF-β mRNA的表达,增强机体的抗肿瘤免疫应答。     

痰热清注射液缓解Lewis肺癌模型小鼠化疗后的免疫抑制

目的：研究痰热清注射液对Lewis肺癌化疗模型小鼠免疫抑制作用的影响,以探讨其对荷肺癌小鼠的免疫调节作用。方法：构建C57 BL /6小鼠Lewis肺癌模型, 40只模型小鼠随机分为模型对照组、痰热清组、化疗组、痰热清联合化疗组及正常对照组,每组8只。治疗后摘小鼠眼球取血,取脾脏、外周血和胸腺,并分离腹腔巨噬细胞（Mφ）,检测各组小鼠胸腺指数及外周血淋巴细胞数量,MTT法检测各组小鼠脾T、B淋巴细胞增殖水平,流式细胞术检测胸腺细胞的凋率和外周血内CD3+、CD3-NK1.1+细胞及CD3+NK1.1+细胞比例,RT-PCR检测胸腺组织 Bcl-2和Fas mRNA表达水平,乳酸脱氢酶（LDH）释放法和ELISA法检测Mφ的杀伤活性及及其分泌IL-12能力,免疫透射比浊法检测小鼠外周血清中IgG及补体C3的含量。结果：痰热清联合化疗组小鼠的胸腺指数、外周血淋巴细胞计数及T、B细胞增殖活性均明显高于单独化疗组（ P <0.01）,同时胸腺细胞的凋亡水平明显低于单独化疗组（ P <0.01）。痰热清联合化疗组小鼠外周血CD3+T细胞、CD3-NK11+细胞及CD3+NK1.1+细胞比例均明显高于化疗组 ( P <0.01)。与化疗组相比,痰热清联合化疗组小鼠胸腺组织 Bcl-2 mRNA 水平明显增高,而 Fas mRNA水平明显减低(均 P <0.01)。痰热清组小鼠Mφ杀伤活性及分泌IL-12水平均明显高于化疗组(均 P <0.01) ,同时外周血IgG及补体C3含量明显高于化疗组(均 P <0.01)。结论：痰热清注射液对肺癌化疗小鼠的免疫系统有明显保护作用,其对抗肿瘤免疫力有明显的促进作用。     

bFGF单抗协同替吉奥抑制肺癌Lewis细胞的增殖及移植瘤血管新生

目的:探讨碱性成纤维生长因子(basic fibroblast growth factor,bFGF)单抗与替吉奥(gimeracil and oteracil porassi-um,又称S-1)联合应用体内外抑制小鼠Lewis肺癌细胞增殖、移植瘤生长及转移、肿瘤血管新生的协同作用。方法:CCK-8法检测bFGF单抗及S-1对Lewis细胞增殖的抑制作用。建立C57BL/6小鼠Lewis肺癌自发转移瘤模型,32只小鼠随机分成生理盐水(NS)组、bFGF单抗组、S-1组和bFGF单抗+S-1组,每组8只;测量瘤体,绘制生长曲线,称瘤质量并计算抑瘤率;计数各组肺表面转移瘤结节;CD31标记血管内皮细胞,计数转移瘤微血管密度(microvessel density,MVD)。结果:bFGF单抗、S-1剂量依赖性抑制Lewis细胞增殖(P<0.05),联合用药组抑制率明显高于单药组(P<0.05或P<0.01)。bFGF单抗组、S-1组以及bFGF单抗+S-1组对Lewis转移瘤的抑瘤率分别为37.8%、47.7%、65.9%,联合组抑瘤率明显高于单药组(P<0.05或P<0.01)。联合组肺表面转移结节、微血管密度明显低于单药组(2.71±0.76vs6.57±0.98、4.71±0.76;21.6±2.9vs33.4±4.9、41.9±6.3;P<0.05或P<0.01)。结论:bFGF单抗联合S-1对Lewis肺癌移植瘤具有协同抑制作用,其机制与抑制细胞增殖及血管新生有关。     

Particle-mediated cytokine gene therapy leads to antitumor and antimetastatic effects in mouse carcinoma models

BACKGROUND: We investigated the effects of continuous cancer gene therapy including (antigen-presenting cell) (APC) engineering and local stimulation of the immune system. MATERIALS AND METHODS: Lewis lung carcinomas and B16 melanomas, intradermally established on C57/Bl6 mice, were shot using a gene gun every 4th day with a combination of plasmids. The first therapy group received plasmids coding the genes for interleukin (IL)-12 and IL-2. The second therapy group was treated with plasmids coding for B7.1 interferon-gamma (IFN-gamma)/IL-12 alternated by a plasmid coding IL-2. Control were mice without any therapy or treatment with the empty plasmid. RESULTS: Gene therapy led to reduced tumor sizes in the therapy groups of both models (significant for the Lewis lung carcinoma). We found an enhanced survival and reduced tumor growth rate in the therapy groups; however, the effects were not significant. IL- 12/IL-2 therapy was more effective, compared to B7.1/IFN-gamma/IL-12 and IL-2. Cytokine gene transfer let to a significantly lower metastasis rate in Lewis lung carcinoma. CONCLUSIONS: Continuous particle-mediated gene transfer is easy to handle and shows good results. Gene therapy combining the genes coding for IL-12 and IL-2 was superior to additional IFN-gamma/B7.1. APC engineering does not appear to be sufficient in these poorly antigenic tumors.     

In vivo studies with Interleukin-12 alone and in combination with monocyte colony-stimulating factor and/or fractionated radiation treatment

Interleukin-12 (IL-12) was found to be an active anti-tumor agent in 3 established murine solid tumors: B16 melanoma, Lewis lung carcinoma and renal cell carcinoma (RenCa). IL-12 was well tolerated over a 100-fold dose range. Only the high-dose treatment of IL-12 resulted in a clear reduction in the number of lung metastases from B16 melanoma and Lewis lung carcinoma. Treatment of animals bearing Lewis lung carcinoma with IL-12 in combination with fractionated radiation therapy was markedly dose-modifying, indicating that IL-12 was acting synergistically with radiation. Treatment of animals bearing the same tumor with monocyte colony-stimulating factor (M-CSF) along with fractionated radiation therapy resulted in a parallel increase in tumor growth delay with increasing dose of M-CSF, indicating that M-CSF was affecting a subpopulation of tumor cells in addition to those killed by radiation therapy. The combination of IL-12 with M-CSF was most effective with radiation therapy, especially in the clinically relevant dosages of 2 and 3 Gy per fraction. By isobologram analysis, IL-12 and M-CSF, along with fractionated radiation therapy, resulted in a greater-than-additive (synergistic) tumor response. © 1996 Wiley-Liss, Inc.     

Effects of interleukin 2 treatment combined with local hyperthermia in mice inoculated with Lewis lung carcinoma cells

Recombinant human (rhu) interleukin 2 (IL-2) was evaluated alone and in combination with local hyperthermia (LH) in mice inoculated s.c. with 5 x 10(5) Lewis lung carcinoma cells. Four treatment regimens were begun 6 days postinoculation at a time when the tumor had grown to approximately 8.0 mm in diameter. Treatments were: group 1, saline injected as control; group 2, LH; group 3, rhuIL-2; or group 4, LH combined with rhuIL-2. LH utilized hot water circulation by a Brann Thermomix 1420. The intratumor temperature was maintained at 43 +/- 0.2 degrees C for 30 min each on days 6 and 10 and rhuIL-2 was given s.c. at 5 x 10(4) units twice a day for 5 days. Thirty mice in each group were sacrificed 28 days after tumor inoculation. An additional 20 mice in each group were observed for survival time. The size of primary tumor and the number of lung metastases were reduced and the survival time was prolonged in mice treated by either LH or IL-2. However, a greater antitumor effect in Lewis lung carcinoma tumor-bearing mice was observed using IL-2 therapy combined with LH. Tumor growth was associated with increased splenic granulocyte-macrophage progenitor cells and an abnormal L3T4+/Lyt-2+ lymphocyte subset ratio (less than 1.0). Splenic granulocyte-macrophage progenitor cell numbers and the L3T4+/Lyt-2+ ratio returned to normal in the group treated with combination therapy, the best responder group. The L3T4+/Lyt-2+ ratio did not change in the groups treated with single therapy. These results suggest the efficacy and possible clinical relevance of combined therapy with rhuIL-2 and LH for certain metastatic tumors.     

20(S)-人参皂苷Rg_3对Lewis肺癌生长及转移的抑制作用

 目的观察20(S)-人参皂苷Rg3(SPG-Rg3)抗Lewis肺癌生长及转移的作用并探讨其作用机制。方法建立Lewis肺癌实体瘤模型及自发肺转移模型观察SPG-Rg3的抗肿瘤作用,并取Lewis肺癌C57BL/6荷瘤小鼠的脾脏,检测T淋巴细胞转化活性、NK细胞及IL-2活性。结果实体瘤实验中,3.0mg/kg和1.0mg/kg SPG-Rg3用药组瘤重明显低于溶剂对照组(P<0.05),0.3mg/kg组瘤重与溶剂对照组间无差异(P>0.05);SPG-Rg3用药组肺转移结节均明显少于溶剂对照组(P<0.05);SPG-Rg3用药组Lewis肺癌C57BL/6荷瘤小鼠的脾细胞对ConA和IL-2反应性以及NK活性均高于溶剂对照组(P<0.05)。结论SPG-Rg3可抑制Lewis肺癌生长及转移,可能是通过提高荷瘤小鼠的免疫功能来发挥其抑瘤作用。     

局部注射小鼠白细胞介素12逆转录病毒包装细胞对大鼠肝癌的治疗

目的:研究低剂量环磷酸胺(Cy)联合MHC Ⅰ类限制性肿瘤抗原多肽Mutl致敏、白细胞介素2(IL-2)基因修饰的树突状细胞(DCs)对转移性肺癌小鼠的治疗作用及其免疫学机理.方法:制备小鼠骨髓来源的DCs,用转移性Lewis肺癌特异性多肽Mutl预激经IL-2基因修饰的DCs联合低剂量Cy治疗转移性肺癌小鼠.通过FACS分析其脾细胞内T淋巴细胞比例的变化,~51Cr释放法检测CTL和NK细胞杀伤活性.结果:肿瘤抗原多肽致敏、IL-2基因修饰的DCs与小剂量Cy联合后,能比单用DCs更有效地治疗转移性肺癌,小鼠脾细胞中CD8~ T细胞和NK1.1~ 细胞明显比例升高,联合治疗组诱导出的CTL杀伤活性最高.结论:以肿瘤抗原多肽冲击致敏的IL-2基因修饰的DCs联合小剂量Cy能更有效地促进荷瘤宿主免疫应答,具有显著地体内抑制肺癌转移的效果.     

低剂量环磷酰胺增强MHCⅠ类限制性肿瘤抗原多肽冲击致敏的树突状细胞的抗肿瘤转移效果

目的:研究低剂量环磷酸胺(Cy)联合MHC Ⅰ类限制性肿瘤抗原多肽Mutl致敏、白细胞介素2(IL-2)基因修饰的树突状细胞(DCs)对转移性肺癌小鼠的治疗作用及其免疫学机理.方法:制备小鼠骨髓来源的DCs,用转移性Lewis肺癌特异性多肽Mutl预激经IL-2基因修饰的DCs联合低剂量Cy治疗转移性肺癌小鼠.通过FACS分析其脾细胞内T淋巴细胞比例的变化,~51Cr释放法检测CTL和NK细胞杀伤活性.结果:肿瘤抗原多肽致敏、IL-2基因修饰的DCs与小剂量Cy联合后,能比单用DCs更有效地治疗转移性肺癌,小鼠脾细胞中CD8~+T细胞和NK1.1~+细胞明显比例升高,联合治疗组诱导出的CTL杀伤活性最高.结论:以肿瘤抗原多肽冲击致敏的IL-2基因修饰的DCs联合小剂量Cy能更有效地促进荷瘤宿主免疫应答,具有显著地体内抑制肺癌转移的效果.     

人端粒酶逆转录酶启动子在裸鼠中增强人喉癌对基因放射治疗的敏感性

目的 探索人端粒酶逆转录酶启动子(hTERTp)介导自杀基因辣根过氧化酶(HRP)-吲哚乙酸(IAA)系统联合射线,对相同来源而放射敏感性不同的人喉癌移植瘤模型的治疗作用.方法 建立相同来源而放射敏感性不同的人喉癌(Hep-2和Hep-2R细胞)移植瘤模型,并分为联合治疗组(A组和AR组)、基因治疗组(B组和BR组)、单纯放射组(C组和CR组)和对照组(D组和DR组).瘤内注射脂质体包裹的质粒phTERTp-HRP,腹腔内注射IAA从并联合放疗30 Gy,观察对移植瘤生长的抑制作用.应用原位末端转移酶标记技术(TUNEL)检测肿瘤细胞的凋亡情况;应用AP法检测瘤内HRP蛋白的表达.结果 裸鼠移植瘤生长以联合治疗组最慢,以对照组最快.A组的肿瘤抑制率为54.8%,B组为10.0%,C组为31.9%,AR组为52.7%,BR组为24.8%,CR组为17.0%.A组和AR组可见大量肿瘤细胞坏死和凋亡,凋亡指数分别为16.6%±1.3%和17.6%±1.3%,高于其他组(P<0.05).B组的HRP蛋白表达率(21.9%±5.7%)低于BR组和(33.3%±8.9%),辐射诱导后,A组和AR组的HRP蛋白表达率分别增加2.1和1.6倍(P<0.05).结论 在不同放射敏感性的喉癌移植瘤模型中,hTERTp能被射线诱导,并根据瘤内端粒酶活性增强HRP基因的表达.hTERTp·HRP-IAA系统通过诱导肿瘤细胞凋亡和引起细胞坏死,抑制裸鼠移植瘤生长,并与射线协同作用,起到放射增敏作用.     

黄芪多糖对气阴两虚Lewis肺癌荷瘤小鼠肿瘤生长、转移及细胞周期的影响

目的 观察黄芪多糖抑制气阴两虚Lewis肺癌荷瘤小鼠的生长、转移及对肺癌细胞周期的影响。方法 体外培养Lewis肺癌细胞,随机分为对照组和中药组,流式细胞术检测细胞周期;C57BL/6J小鼠90只,设空白组10只,余80只刨花烟熏并灌胃温热性的中药,移植Lewis肺癌实体肿瘤建立气阴两虚荷瘤小鼠模型并随机分为8组,比较各组小鼠抑瘤率及q值,计数外周血细胞及骨髓细胞,ELISA测定血清IL-2、IFN-γ、TNF-α、IL-10、HIF-1α、VEGF、MMP-2的含量。结果 黄芪多糖将Lewis 肺癌细胞阻滞于S期,随着药物浓度的增加,细胞凋亡逐渐增加;联合用药各组的抑瘤率高于黄芪多糖各组和顺铂组,q值均在0.85~1.15之间;与顺铂组比较,联合用药中、高剂量组小鼠外周血细胞及骨髓细胞的数量,IL-2、INF-γ、TNF-α均显著升高,IL-10、 HIF-1α、VEGF、MMP-2均显著降低（P<0.05, P<0.01）。结论 黄芪多糖在体外对Lewis肺癌细胞有抑制作用,体内与顺铂联合能抑制气阴两虚Lewis荷瘤小鼠肺癌细胞的生长、转移,提高外周血细胞和骨髓细胞的细胞数量,提高IL-2、INF-γ、TNF-α的含量,减少IL-10、HIF-1α、VEGF、MMP-2的含量。     

Antibody-targeted horseradish peroxidase associated with indole-3-acetic acid induces apoptosis in vitro in hematological malignancies

Indole-3-acetic acid (IAA), when oxidized by horseradish peroxidase (HRP), is transformed into cytotoxic molecules capable of inducing cell injury. The aim of this study was to test if, by targeting hematopoietic tumors with HRP-conjugated antibodies in association with IAA treatment, there is induction of apoptosis. We used two lineages of hematologic tumors: NB4, derived from acute promyelocytic leukemia (APL) and Granta-519 from mantle cell lymphoma (MCL). We also tested cells from 12 patients with acute myeloid leukemia (AML) and from 10 patients with chronic lymphocytic leukemia (CLL). HRP targeting was performed with anti-CD33 or anti-CD19 antibodies (depending on the origin of the cell), followed by incubation with goat anti-mouse antibody conjugated with HRP. Eight experimental groups were analyzed: control, HRP targeted, HRP targeted and incubated with 1, 5 and 10 mM IAA, and cells not HRP targeted but incubated with 1, 5 and 10 mM IAA. Apoptosis was analyzed by flow cytometry using annexin V-FITC and propidium iodide labeling. Results showed that apoptosis was dependent on the dose of IAA utilized, the duration of exposure to the prodrug and the origin of the neoplasia. Targeting HRP with antibodies was efficient in activating IAA and inducing apoptosis.