Influence of toxoplasmosis on acetylcholinesterase activity,nitric oxide levels and cellular lesion on the brain of mice

The objective of this study was to investigate the activity of acetylcholinesterase (AChE), nitrite/nitrate (NO_x) levels, as well as the biomarkers of cellular damage in the brain of mice experimentally infected with Toxoplasma gondii. Sixty mice were divided into two experiments: in experiment I the mice were infected with T. gondii/RH strain, while in experiment II they were infected with T. gondii, strains VEG and ME-49. Our evaluations were carried out on brain homogenized samples, assessing the AChE and glutathione reductase (GR) activities, and NO_x, TBARS and AOPP levels in all the infected animals, compared with the control group. In both experiments, I and II, it was observed an increase in the activity of AChE and GR, as well as in the levels of NO_x in the brain of infected mice with T. gondii. TBARS levels were increased in mice infected with the three different strains, RH, ME-49, and VEG. AOPP concentration was increased only in mice infected with the RH strain. Animals infected with the strains VEG and ME-49 showed histological lesions, associated with the presence of the parasite in the brain. Therefore, the infection by T. gondii is able to interfere in cholinesterase activity and NO levels, in association with oxidative stress and histological lesion.     

VEG株弓形虫卵囊对昆明小鼠的毒力研究

目的探究VEG株弓形虫卵囊对中国昆明小鼠的致病性。方法分别选择1个,100个~108个的VEG株弓形虫卵囊灌胃昆明小鼠,采用MAT、HE和IHC方法研究小鼠对弓形虫的感染情况,并分析小鼠感染率,生存率及其大脑内的弓形虫包囊数量。结果≥10~2个VEG株弓形虫卵囊可引起小鼠100%感染,最低致死剂量为10~2个卵囊,100%致死剂量为108个卵囊,急性期死亡时间为7DPI~14DPI,弓形虫的成囊率是32.14%(9/28),包囊数量为9~857个/只小鼠大脑,感染小鼠生存率为67.44%(29/43),最长存活时间≥390DPI。结论 VEG株弓形虫卵囊对昆明小鼠的毒力中等,包囊形成率较高。     

胃癌组织中VEGF—C、VGFR-3表达和微淋巴管密度的研究

目的探讨血管内皮生长因子C（VEGF—C）及其受体-3（VEGFR-3）在胃癌组织中的表达,分析其表达与微淋巴管密度（LVD）和胃癌生物学行为之间的关系。方法采用组织微阵列技术,通过免疫组化sP法检测胃癌组织标本125例、癌旁正常组织96例中VEGF—C、VEGFR-3的表达,以Podoplanin标记微淋巴管密度（LVD）进行计数。结果VEGF—C和VEGFR-3在胃癌组织和癌旁正常组织中的阳性表达率分别为62．4％、56．0％和10．41％、12．5％,差异有统计学意义（均P〈0．05）,VEGF—C和VEGFR一3表达与LDV、胃癌淋巴结转移、临床分期、远处转移及CEA均呈正相关（P〈0．05）,VEGFR一3表达与Ca19—9呈正相关（P〈0．05）而VEGF—C的表达则与CA19—9无相关（P〉0．05）;胃癌组织中LVD计数为（2．98±0．81）个高于癌旁正常组织中计数（1．82±0．63）个,差异有统计学意义（P〈0．05）,且癌周LVD计数高于癌内LVD计数（P〈0．05）。结论胃癌组织中VEGF—C和VEGFR-3均呈高表达,与淋巴管生成有关并参与了胃癌的发生、浸润和转移。     

CD34和血管内皮生长因子在人甲状腺癌组织中的表达及微血管密度的病理意义

目的:探讨人甲状腺癌组织血管内皮标记物CD34和血管内皮生长因子(VEGF)的表达及微血管密度(microvessel density,MVD)的病理意义.方法:采用免疫组织化学染色方法(EnVision)检测68例人甲状腺癌组织CD34和VEGF的表达,并对CD34表达阳性血管进行MVD计数,对VEGF表达阳性血管进行半定量计数,结合甲状腺癌的病理特征进行分析.结果:在68例甲状腺癌组织中,有50例VEGF表达,阳性率为74%.甲状腺癌组织VEGF阳性组的MVD明显高于阴性组,差异显著(P＜0.05).结论:VEGF阳性和MVD在甲状腺癌中明显增高,VEGF阳性表达对甲状腺癌的发生、发展及预后判断有重要意义.     

刚地弓形虫VEG株速殖子感染宿主细胞最优接种比的曲线拟合分析

目的 探讨不同浓度梯度的刚地弓形虫速殖子体外感染对侵蚀宿主细胞能力的影响及二者之间的最优接种比。方法 依照耗材规格和建议上液量,将宿主Vero细胞依次铺入96孔、24孔、12孔、6孔细胞板和25T培养瓶后培养12 h;常规纯化和计数VEG株速殖子并倍比稀释出8个梯度,分别用来感染上述细胞,使首个感染量与宿主细胞铺入数相等;继续培养4 d后全量收集培养物,经DNA提取和Real-time PCR定量检测,以7种回归模型对所得速殖子数的均值进行拟合分析(n=3),选出最佳函数类型并求极值,以此明确弓形虫感染与宿主细胞间的接种关系。结果 Real-time PCR定量结果显示,VEG株速殖子最初感染量及所用耗材培养规格对弓形虫侵蚀宿主细胞的能力均有影响,并且四次多项式函数为弓形虫感染宿主细胞4 d时的最佳拟合曲线方程;经求导和求极值发现,同种耗材培养条件下,弓形虫VEG株速殖子感染数与宿主Vero细胞间存在最优接种比例关系。结论 96孔、24孔、12孔、6孔细胞板和25T培养瓶内弓形虫速殖子与宿主细胞间的接种比例依次为1/7.20、1/5.32、1/4.53、1/4.03和1/43.02。