新城疫病毒D817对裸小鼠人结肠癌移植瘤的抑制作用

Objective To study the anti-tumor effects of Newcastle disease virus (NDV) strain D817 on human colon carcinoma model in nude mice. Methods The nude mouse model of human colon carcinoma was established by subcutaneous inoculation of human colon cancer LOVO cells. The tumor-bearing mice were given PBS, 5-Fu, high-dose NDV D817, moderate-dese NDV D817 or low-dose NDV D817 via caudal vein injection. The tumor size and weight of mice were measured. The liver damages were examined by histopathology. Apoptosis and necrosis of tumor ceils were detected by flow cytometry. The endotumoral content of TNF-α was detected using a mouse TNF-a ELISA kit. The live vires was detected by bemagglutination (HA) test. Results The moderate-dose NDV D817 inhibited the tumor growth more apparently than 5-Fu. The tumor growth inhibition rate reached to 48.1%. The liver damage and the weight change caused by NDV were less severe. NDV D817 made an increased apoptosis index and induced production of TNF-α. Live virus was not detected in important organs except in the tumor of nude mice by HA test. Conclusion In the anti-tumor process in nude mice bearing xenografts of human colon carcinoma, a suitable dose of NDV D817 is more safe and effective.     

6株NDV鄱阳株对肝癌细胞杀伤作用的初步研究

目的：研究从江西鄱阳湖野鸭分离的6株NDV对肝癌细胞的杀伤效应，进-步筛选NDV溶瘤毒株。方法：用MTT法研究6株NDV鄱阳株对两株传代肝癌细胞株Novikoff和HepG-2及一株正常肝细胞株HL-7702的杀伤效应。结果：6株NDV鄱阳株对肝癌细胞株Novikoff和HepG-2有湿著杀伤效应，而对人正常肝细胞HL-7702无明显影响；病毒对细胞的杀伤活性与病毒作用剂量和病毒作用时间成正比；病毒在肝癌细胞中有明显复制增殖现象；Novikoff肝癌细胞对NDV敏感性强于HepG-2肝癌细胞。结论：6株NDV鄱阳株对Novikoff及HepG-2肝癌细胞产生显著的杀伤作用，而对正常肝细胞HL-7702未见明显影响。     

新城疫病毒D817对裸小鼠人结肠癌移植瘤的抑制作用

Objective To study the anti-tumor effects of Newcastle disease virus (NDV) strain D817 on human colon carcinoma model in nude mice. Methods The nude mouse model of human colon carcinoma was established by subcutaneous inoculation of human colon cancer LOVO cells. The tumor-bearing mice were given PBS, 5-Fu, high-dose NDV D817, moderate-dese NDV D817 or low-dose NDV D817 via caudal vein injection. The tumor size and weight of mice were measured. The liver damages were examined by histopathology. Apoptosis and necrosis of tumor ceils were detected by flow cytometry. The endotumoral content of TNF-α was detected using a mouse TNF-a ELISA kit. The live vires was detected by bemagglutination (HA) test. Results The moderate-dose NDV D817 inhibited the tumor growth more apparently than 5-Fu. The tumor growth inhibition rate reached to 48.1%. The liver damage and the weight change caused by NDV were less severe. NDV D817 made an increased apoptosis index and induced production of TNF-α. Live virus was not detected in important organs except in the tumor of nude mice by HA test. Conclusion In the anti-tumor process in nude mice bearing xenografts of human colon carcinoma, a suitable dose of NDV D817 is more safe and effective.     

小鼠腹腔注射流感病毒后外周血IFN-γTNF-α和IL-2的变化及意义

目的 观察和比较小鼠腹腔注射人流感病毒H3N2和禽流感病毒H9N2后外周血干扰素γ(interferon-γ,IFN-γ)、肿瘤坏死因子α(tumor necrosis factor-α,TNF-α)和白细胞介素2(interleukin-2,IL-2)质量浓度的变化,探讨其变化规律.方法 采用腹腔注射方式给小鼠注射人流感病毒H3N2、禽流感病毒H9N2或无病毒尿囊液,分离血清,用ELISA法检测注射后第1、2、3、4和5天外周血IFN-γ、TNF-α和IL-2质量浓度.分别比较人流感病毒H3N2和禽流感病毒H9N2注射组与阴性对照组在不同时间的IFN-γ、TNF-α和IL-2质量浓度.用方差分析和LSD-t检验进行统计学分析.结果 在某些时间段,病毒注射组外周血IFN-γ和IL-2质量浓度与阴性对照组问的差别有统计学意义,而病毒注射组TNF-α质量浓度与阴性对照组间的差别则无统计学意义.结论 小鼠腹腔注射人流感病毒H3N2和禽流感病毒H9N2可促进IFN-γ和IL-2产生,而对TNF-α产生则无显著影响.     

NDV7793体外激活的小鼠单核巨噬细胞(MΦ)对小鼠肝癌细胞的杀伤作用及其机制

 目的
初步研究NDV7793激活的小鼠单核巨噬细胞（MΦ）对小鼠肝癌Novikoff细胞的杀伤作用,并探讨其杀伤机制与TNF-
α和TRAIL的关系。 方法从腹腔分离6周龄BALB/C小鼠MΦ, 用NDV7793于体外刺激小鼠MΦ,以ELISA分别测定
NDV7793刺激小鼠MΦ后产生的TNF-α及TRAIL水平;NDV7793体外刺激MΦ后,与小鼠肝癌Novikoff细胞混合培养,
以LDH微量释放法测定小鼠MΦ对小鼠肝癌Novikoff细胞的杀伤效应。同时设立3组实验对照组：IFN-β阳性对照组
、紫外线灭活NDV（UV-NDV）对照组以及空白对照组。 结果与3个对照组相比,NDV7793在体外能提高MΦ分泌TNF-
α、TRAIL的水平;NDV体外刺激后的小鼠MΦ能杀伤小鼠肝癌Novikoff细胞。结论NDV7793在体外能激活小鼠MΦ,
小鼠MΦ被NDV7793刺激后,对小鼠肝癌Novikoff细胞的杀伤作用增强,NDV激活后的小鼠MΦ对小鼠肝癌Novikoff细
胞的杀伤机制可能与TNF-α和TRAIL有关。     

2012年广东省居民碘盐监测

自2012年3月15日起,广东省将食用盐碘均值从35 mg/kg调整为25 mg/kg(允许波动范围为18～33 mg/kg).为观察盐碘含量调整后全省碘盐质量,于2012年按《碘缺乏病监测方案》开展了全省居民食用盐的抽样监测. 以县(市、区)为监测单位,监测覆盖全省121个县(市、区)和中山、东莞市.每个监测单位按东、西、南、北、中划分5个抽样片区,在每个片区各随机抽取1个镇(街道);辖有5个或不足5个镇(街道)的县,抽取所有镇(街道);在每个镇(街道)随机抽取4个行政村(居委会);在每个行政村(居委会),随机抽取15户居民食用盐.每个县监测约300份盐样.     

新城疫病毒对小细胞肺癌裸鼠移植瘤生长的抑制作用

目的:探讨新城疫病毒(Newcastle disease virus, NDV)7793株在体内对肿瘤生长的抑制作用及机制.方法:体外培养人小细胞肺癌NCI-H446细胞,通过皮下接种NCI-H446细胞建立人小细胞肺癌裸鼠移植瘤模型.NDV组裸鼠瘤内注射新城疫病毒,阳性对照组注射顺铂(cisplatin,DDP),阴性对照组注射PBS.观察移植瘤生长情况和裸鼠体质量变化,绘制肿瘤生长曲线.6周后处死裸鼠剥取肿瘤组织,HE染色观察细胞学变化,免疫组织化学法检测移植瘤细胞Bax和Bcl-2蛋白表达情况.结果:NDV注射对肿瘤生长有显著抑制作用,抑瘤率达34.1%;NDV对荷瘤鼠无不良反应;光学显微镜下观察发现,NDV治疗组肿瘤组织有许多散在分布的凋亡/坏死区域.NDV能明显上调Bax蛋白的表达量(P＜0.01),对Bcl-2蛋白表达则无影响.结论:新城疫病毒7793株在体内能够有效抑制移植瘤生长,其抗肿瘤机制可能与上调Bax蛋白的表达有关.     

新城疫病毒D817对裸小鼠人结肠癌移植瘤的抑制作用

目的 观察新城疫病毒DK/HK/817/1980(NDV D817)对裸小鼠人结肠癌移植瘤的抑制作用.方法 采用LoVo细胞株建立裸小鼠人结肠癌移植瘤模型,分别给予裸小鼠尾静脉注射PBS、氟尿嘧啶(5-Fu)以及NDV D817高、中、低3个剂量,观察不同剂量NDV D817对移植瘤的抑制作用,病理学观察NDV D817对移植瘤和肝细胞的损伤程度,流式细胞术检测肿瘤细胞的凋亡和坏死情况,酶联免疫吸附试验(ELISA)试剂盒检测荷瘤小鼠体内肿瘤坏死因子-α(TNF-α)的含量,血凝实验检测荷瘤小鼠体内活病毒量.结果 中剂量NDV D817可明显抑制移植瘤的生长,肿瘤抑制率达48.1%.NDV D817对荷瘤小鼠体重和肝脏的损伤较小,且具有诱导肿瘤细胞凋亡和诱导机体产生TNF-α的能力.荷瘤小鼠处死后只在瘤内检测到活病毒,而在血清和其他脏器中并没有检出活病毒.结论 在对裸小鼠人结肠癌移植瘤的抑制过程中,NDV D817有明显的抑瘤效果,适当剂量的NDVD817更安全有效.     

新城疫病毒7793株抑制人结肠癌LoVo细胞裸鼠移植瘤的生长及其机制

目的:观察新城疫病毒7793株(Newcastle disease virus 7793 strain,NDV 7793)对人结肠癌LoVo细胞裸鼠移植瘤生长的作用,并探讨其可能机制。方法:建立LoVo细胞裸鼠移植瘤模型,随机分成3组,分别静脉注射PBS、5-FU以及NDV 7793,观察各组裸鼠肿瘤的生长情况,流式细胞术检测移植瘤细胞的坏死率和凋亡率,免疫组织化学法检测移植瘤组织中Bax、Bcl-2蛋白的表达,细胞色素C试剂盒检测移植瘤组织中细胞色素C的含量,ELISA法检测移植瘤组织中TNF-α含量。结果:NDV 7793较5-FU更明显抑制LoVo细胞移植瘤的生长(抑制率50.14%vs 37.14%,P<0.05)。NDV 7793组移植瘤LoVo细胞凋亡率显著高于5-FU对照组[(28.7±1.5)%vs(1.46±0.3)%,P<0.01],且NDV 7793组诱导LoVo细胞的凋亡率和坏死率[(28.7±1.5)%vs(27.80±3.32)%]相当。NDV 7793能促进移植瘤组织中Bax蛋白的表达,对Bcl-2蛋白的表达无影响。NDV 7793可提高移植瘤组织中的细胞色素C含量[(2.28±0.68)vs(0.68±0.13)μg/μl]和TNF-α的水平[(489.6±5.2)vs(167.9±3.9)pg/ml]。结论:NDV 7793可抑制人结肠癌LoVo细胞移植瘤的生长,其机制可能与其上调Bax蛋白、细胞色素C和TNF-α的表达,以及促进肿瘤细胞凋亡有关。