小鼠Ⅳ型胶原α2链非胶原结构域基因的克
发布时间:2018-05-04 07:40
本文选题:血管生成抑制剂 + canstatin ; 参考:《郑州大学》2005年博士论文
【摘要】:肿瘤的生长、浸润和转移依赖肿瘤新生血管的形成,选择肿瘤新生血管作为治疗攻击靶,切断肿瘤细胞获得营养以及生长因子的途经,限制肿瘤生长和防止转移,是降低肿瘤死亡率的良策,,这种抗肿瘤血管生成治疗的“休眠疗法”(dormancy therapy)已成为当今肿瘤治疗的热门研究领域之一,是治疗癌症的新途径。由于血管内皮细胞(endothelial cells,EC)遗传上相对稳定,不易产生耐药性,而且血管内皮细胞通常暴露于血流中,药物能直接发挥作用,故疗效高、副作用小。因此,肿瘤血管生成抑制剂(tumor angiogenesis inhibitor,TAI)有可能成为未来治疗肿瘤的主导药物之一。 canstatin是继血管抑素(angiostatin)、内皮抑素(endostatin)和休眠素(restin)等之后又一种新的内源性血管生成抑制因子。它来源于血管基底膜Ⅳ型胶原α 2链C末端的球形非胶原区(non-collagenous 1,NC1)。研究表明,canstatin能明显抑制血管内皮细胞的增殖并诱导凋亡,同时在移植瘤模型的体内实验中显示出对多种实体瘤生长的显著抑制作用。而且,体外血管内皮细胞增殖抑制试验表明,与早些时候发现的血管生成抑制因子相比,其半数有效量ED_(50)比内皮抑素低3倍,在肿瘤的抗血管治疗方面更具临床应用前景。由于鼠和人血管基底膜胶原蛋白的氨基酸序列具有很高的同源性,小鼠canstatin的生物学活性研究目前国内外尚未见报道。我们在氨基酸序列分析中发现,小鼠canstatin N端(1-95aa)片段(Can-N)与人的同源性为100%,其一致的氨基酸序列有可能意味着重要的生物学功能。小鼠canstatin C端(96-227aa)片段(Can-C)与人的同源性为94%。为了探索小鼠canstatin、Can-N及Can-C的生物学活性,我们首次
[Abstract]:Tumor growth, invasion and metastasis depend on the formation of tumor neovascularization. Tumor neovascularization is chosen as the target of treatment, and tumor cells are cut off to obtain nutrients and growth factors, so as to limit tumor growth and prevent metastasis. This kind of anti-tumor angiogenesis therapy "dormancy therapeutics" has become one of the hot research fields of cancer treatment nowadays, and it is a new way to treat cancer. Because vascular endothelial cells (ECs) are relatively stable in heredity, it is not easy to produce drug resistance, and vascular endothelial cells are usually exposed to blood flow, and drugs can play a direct role, so the effect is high and the side effect is small. Therefore, tumor angiogenesis inhibitor tumor angiogenesis inhibitor (TAI) may become one of the leading drugs for the treatment of cancer in the future. Canstatin is a new endogenous angiogenic inhibitor after angiostatin, endostatin, endostatin and restrestin. It is derived from the non-collagenous non-collagenous region of the C-terminal of 伪 2 chain of vascular basement membrane type 鈪
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