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| | AIM:To investigate the characterization of pharmacological action & of CH50, a recombinant polypeptide of human fibronectin, by comparing the effects of CH50 on macrophage activation and its anti-tumor activity with those of lipopolysaccharides (LPS). METHODS: The production of nitric oxide (NO) as an index macrophage activation was determined by colorimetric assay. The in-terferon-γ (EFN-γ) transfection was performed with co-precipitation of calcium phosphate and DNA. The melanoma B16 cells were inoculated... | | 目的:将重组纤连蛋白多肽CH50的抗肿瘤活性及巨噬细胞激活作用与脂多糖(LPS)进行比较,分析CH50作为抗肿瘤多肽的药理作用特点。 方法:一氧化氮(NO)以比色法进行检测;采用磷酸钙-DNA共沉淀法进行γ-干扰素(IFN-γ)体内基因转染;腹腔内接种黑色素瘤B16细胞并计数肿瘤结节数。结果:体外低浓度或单独作用时,CH50激活巨噬细胞产生NO的作用比LPS低10倍以上(P<0.01)。但在体外大于1 mg·L~(-1)浓度且与IFN-γ联合应用时,CH50促进巨噬细胞产生NO的作用与LPS相同(P>0.05)。CH50和LPS之间没有协同作用。CH50单用在体内抑制肿瘤生长的作用优于LPS(P<0.01)。CH50/IFN-γ亦比LPS/IFN-γ抑制肿瘤生长的作用更强。 结论:与IFN-γ联合应用时,CH50对巨噬细胞的激活能力与LPS相同;但是CH50在体内具有更强的抑制小鼠黑色素瘤生长的作用。 | | 文摘来源 | | BACKGROUND &OBJECTIVE:Some polypeptides have targeting selective a nti-tumor effects act on cell membrane, but studies on this field were restrict ed by lack of peptide information. This study was to establish a tumor cell memb rane model, and isolate specific anti-tumor peptides. METHODS: Pore-forming pe ptides Mast21 and MastoparanX were chosen as positive control peptides to optimi ze the artificially synthesized tumor liposome cell membrane model, ribosome dis play system was used to isolate specific a... | | 背景与目的:部分多肽类药物具有靶向选择性抗肿瘤作用,目前针对多肽抗肿瘤的研究都是基于某一或数个肽链的信息,受到现有多肽信息的限制。本研究旨在通过肿瘤细胞膜模型的建立,应用核糖体表达法进行抗肿瘤多肽筛选。方法:选择已知可在肿瘤细胞膜上穿孔的阳性对照多肽Mast21和MastoparanX优化人工合成的肿瘤脂质体细胞膜模型。组建可直接用于体外多肽表达的DNA库,应用核糖体表达法进行特异性抗肿瘤多肽筛选,应用MTT法检测筛选的多肽在体外抗肿瘤效果。结果:应用核糖体体外表达法和脂质体(PE/PS,3∶7)肿瘤细胞膜模型成功地从设计的肽库中筛选出一些肽,体外实验证实部分多肽能抑制非小细胞肺癌细胞株(NCI-H460)生长,而对正常人体纤维细胞CCD-27SK无影响。结论:合适的肿瘤细胞膜模型和核糖体表达法,可从肽库中筛选特异性抗肿瘤多肽,为开发作用机制完全不同的抗肿瘤新药奠定基础。 | | 文摘来源 | | Objective To observe the inhibitory effect of antineoplastic polypeptide from Buthus martensii venom (APBMV) on transplanted tumors-hepatoma 22(H22) and its cells. Methods Tumor weight, tumor growth inhibitory rate(IR%) of tumor bearing mice were used as the indexes. Mice were inoculated by H22, and 24h late the tumor bearing mice were divided into control, CTX-treated and the APBMV-treated groups which were administered 1.2mg/ml,0.8mg/ml,0.4mg/ml,0.5ml of APBMV separately by po. CTX-treated and control gro... | | 目的观察纯化蝎毒抗肿瘤多肽穴APBMV雪,<3500kD灌胃对小鼠肝癌H22动物移植瘤的抑制作用及对H22细胞的体外抑制杀伤作用。方法将接种H22的带瘤小鼠分为对照组、环磷酰胺治疗组和纯化蝎毒抗癌多肽治疗组。其中APBMV浓度1.2mg/ml、0.8mg/ml,以0.5ml灌胃,给药10d后处死,取实体瘤称重并计算肿瘤生长抑制率。采用噻唑蓝(MTT法)、集落形成抑制实验,用丝裂霉素C(MMC)为阳性对照药品,以蝎毒提取物SVCⅠ、SVCⅡ、SVCⅢ、SVCⅣ各组分(浓度分别为45μg/ml、60μg/ml、75μg/ml、90μg/ml),分别处理人大肠癌细胞H22,观察H22的生长情况。结果APBMV在应用的前两个剂量范围内对H22移植瘤有明显的抑制作用,抑制率大于50%,与对照组比较差异显著(P<0.05),三个不同剂量组之间差异亦显著,有明显的量效关系。SVCⅢ对Lovo细胞的细胞毒性和集落形成的抑制作用略强于MMC组,与对照组差异显著穴r=0.98熏P<0.01雪,SVCⅠ、SVCⅡ、SVCⅣ对细胞H22的影响,在所用药物浓度内与对照组比较,无显著性差异,细胞毒性作... | | 文摘来源 | |   | | << 更多相关文摘 |
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