小鼠Ⅳ型膠原α2鏈非膠原結(jié)構(gòu)域基因的克
發(fā)布時間:2018-05-04 07:40
本文選題:血管生成抑制劑 + canstatin; 參考:《鄭州大學(xué)》2005年博士論文
【摘要】:腫瘤的生長、浸潤和轉(zhuǎn)移依賴腫瘤新生血管的形成,選擇腫瘤新生血管作為治療攻擊靶,切斷腫瘤細(xì)胞獲得營養(yǎng)以及生長因子的途經(jīng),限制腫瘤生長和防止轉(zhuǎn)移,是降低腫瘤死亡率的良策,,這種抗腫瘤血管生成治療的“休眠療法”(dormancy therapy)已成為當(dāng)今腫瘤治療的熱門研究領(lǐng)域之一,是治療癌癥的新途徑。由于血管內(nèi)皮細(xì)胞(endothelial cells,EC)遺傳上相對穩(wěn)定,不易產(chǎn)生耐藥性,而且血管內(nèi)皮細(xì)胞通常暴露于血流中,藥物能直接發(fā)揮作用,故療效高、副作用小。因此,腫瘤血管生成抑制劑(tumor angiogenesis inhibitor,TAI)有可能成為未來治療腫瘤的主導(dǎo)藥物之一。 canstatin是繼血管抑素(angiostatin)、內(nèi)皮抑素(endostatin)和休眠素(restin)等之后又一種新的內(nèi)源性血管生成抑制因子。它來源于血管基底膜Ⅳ型膠原α 2鏈C末端的球形非膠原區(qū)(non-collagenous 1,NC1)。研究表明,canstatin能明顯抑制血管內(nèi)皮細(xì)胞的增殖并誘導(dǎo)凋亡,同時在移植瘤模型的體內(nèi)實驗中顯示出對多種實體瘤生長的顯著抑制作用。而且,體外血管內(nèi)皮細(xì)胞增殖抑制試驗表明,與早些時候發(fā)現(xiàn)的血管生成抑制因子相比,其半數(shù)有效量ED_(50)比內(nèi)皮抑素低3倍,在腫瘤的抗血管治療方面更具臨床應(yīng)用前景。由于鼠和人血管基底膜膠原蛋白的氨基酸序列具有很高的同源性,小鼠canstatin的生物學(xué)活性研究目前國內(nèi)外尚未見報道。我們在氨基酸序列分析中發(fā)現(xiàn),小鼠canstatin N端(1-95aa)片段(Can-N)與人的同源性為100%,其一致的氨基酸序列有可能意味著重要的生物學(xué)功能。小鼠canstatin C端(96-227aa)片段(Can-C)與人的同源性為94%。為了探索小鼠canstatin、Can-N及Can-C的生物學(xué)活性,我們首次
[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 偽 2 chain of vascular basement membrane type 鈪
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