Modified branched peptides with a histidine-rich tail enhance in vitro gene transfection.

Modified branched peptides with a histidine-rich tail enhance in vitro gene transfection.
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DOI:
10.1093/nar/gni040
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发表时间:
2005-02-24
影响因子:
14.9
通讯作者:
Mixson AJ
Mixson AJ
中科院分区:
生物学2区
文献类型:
--
作者:
Leng Q;Mixson AJ

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成功的基因治疗依赖于高效、无毒的基因传递系统的发展。为了实现这一目标,我们的实验室专注于固相合成的肽载体,其中的氨基酸序列可以精确地改变,以增加细胞内的DNA运输。我们先前确定组氨酸和赖氨酸的线性和支化共聚物与脂质体组合增强基因转染的效率。在这项研究中,我们已经修改了两个分支的组氨酸-赖氨酸(HK)肽添加一个富含组氨酸的尾巴。在各种细胞系中,这种富含组氨酸的尾部显著提高了转染效率,可能是通过增加聚合物的缓冲能力。一种具有富含组氨酸的尾部的聚合物H2 K4 bT与常用的转染剂相比是有利的。连同我们的转染方案的修改,这些改进的HK肽单独,没有脂质体,是质粒进入各种细胞的有效载体。我们预计,分支HK肽将继续开发作为载体的核酸在体外和体内的应用。
Successful gene therapy depends on the development of efficient, non-toxic gene delivery systems. To accomplish this objective, our laboratory has focused on solid-phase synthesized peptide carriers, in which the amino acid sequence can be varied precisely to augment intracellular DNA transport. We previously determined that linear and branched co-polymers of histidine and lysine in combination with liposomes enhanced the efficiency of gene transfection. In this study, we have modified two branched histidine-lysine (HK) peptides by adding a histidine-rich tail. In a variety of cell lines, this histidine-rich tail markedly improved transfection efficiency, presumably by increasing the buffering capacity of the polymer. One polymer with a histidine-rich tail, H2K4bT, compared favorably with the commonly used transfection agents. Together with modification of our transfection protocol, these improved HK peptides alone, without liposomes, are the effective carriers of plasmids into a variety of cells. We anticipate that branched HK peptides will continue to be developed as carriers of nucleic acids for in vitro and in vivo applications.
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