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Dynamic distribution and expression in vivo of human endostatin gene delivered by adenoviral vector.

机译:腺病毒载体递送人内皮抑素基因的体内动态分布和表达。

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Endostatin, a 20-kDa carboxyl-terminal fragment of collagen XVIII, is a potent inhibitor of endothelial cell proliferation and tumor angiogenesis. We have constructed replication-deficient recombinant adenovirus (Ad-rhE), which encoded secreted human endostatin, and our previous studies showed that Ad-rhE had a potent suppression of tumor growth in vivo. In the present study, we investigated the dynamic distribution and expression of human endostatin gene in vivo using fluorogenic real-time quantitative PCR and enzyme-linked immunosorbent assay(ELISA), respectively, with an injection of 2.0 x10(9)pfu of Ad-rhE. After injection, the Ad-rhE DNAs decreased sharply, but lasted a relative long-term at low concentration (10,000--20,000 copies/mg tissues). Whereas the expressed endostatin rose up rapidly, and reached to the top on day 5 after injection of Ad-rhE, and then decreased sharply, but endostatin in tumors sustained to over 9 days at a certain level. Both Ad-rhE DNAs and endostatin mainly enriched intumors in vivo, and then in livers. These results suggest that endostatin gene delivered by adenoviral vector can generate a high expression in vivo, and both the metabolism pathways of Ad-rhE DNAs and endostatin in vivo are through the systems of livers.
机译:内皮抑素是胶原蛋白XVIII的20 kDa羧基末端片段,是内皮细胞增殖和肿瘤血管生成的有效抑制剂。我们已经构建了复制缺陷型重组腺病毒(Ad-rhE),该腺病毒编码分泌的人内皮抑素,而我们先前的研究表明,Ad-rhE在体内可以有效抑制肿瘤的生长。在本研究中,我们分别使用荧光实时定量PCR和酶联免疫吸附测定(ELISA)并注射了2.0 x10(9)pfu的Ad-,研究了人类内皮抑素基因在体内的动态分布和表达重组人注射后,Ad-rhE DNA急剧减少,但在低浓度(10,000--20,000拷贝/毫克组织)下持续相对较长的时间。表达的内皮抑素迅速上升,并在注射Ad-rhE后第5天达到最高,然后急剧下降,但肿瘤中的内皮抑素在一定水平上持续了9天以上。 Ad-rhE DNA和内皮抑素都主要在体内富集肿瘤,然后在肝脏富集。这些结果表明,腺病毒载体递送的内皮抑素基因可以在体内产生高表达,并且Ad-rhE DNA和内皮抑素的体内代谢途径均通过肝脏系统。

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