Synthesis of folate-functionalized RAFT polymers for targeted siRNA delivery.

Synthesis of folate-functionalized RAFT polymers for targeted siRNA delivery.
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DOI:
10.1021/bm200485b
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发表时间:
2011-07-11
期刊:
影响因子:
6.2
通讯作者:
Stayton, Patrick S.
Stayton, Patrick S.
中科院分区:
化学2区
文献类型:
--
作者:
Benoit, Danielle S. W.;Srinivasan, Selvi;Shubin, Andrew D.;Stayton, Patrick S.

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siRNA的受体介导的细胞特异性递送能够使特定组织中的靶基因沉默,为多种疾病的强大治疗选择打开了大门。然而,能够靶向和有效siRNA递送的递送系统的开发通常需要多个步骤和使用复杂的正交化学。以前,我们开发了由甲基丙烯酸二甲氨基乙酯-b-甲基丙烯酸二甲氨基乙酯-共-甲基丙烯酸丁酯-共-丙基丙烯酸组成的二嵌段共聚物作为有效的siRNA递送系统,其保护siRNA免受酶促降解,并使其能够通过pH响应性内体溶解行为进行细胞溶质递送。使用活性自由基聚合方法,特别是可逆加成-断裂链转移(RAFT)聚合来聚合这些结构,所述可逆加成-断裂链转移(RAFT)聚合采用链转移剂(CTA)来调节反应速率,从而产生具有低多分散性和遥爪链端的聚合物,所述遥爪链端反映CTA的化学性质。在这里,我们描述了一个叶酸受体靶向的二嵌段共聚物siRNA递送系统的简单,容易的合成,因为叶酸受体是一个有吸引力的目标,由于其在许多癌症的肿瘤选择性治疗。具体来说,我们详细介绍了从头合成的叶酸功能化的CTA,使用叶酸-CTA的二嵌段共聚物的控制聚合,并证明了有效的,特定的细胞叶酸受体相互作用和体外基因敲低使用叶酸功能化的聚合物。
Receptor-mediated, cell-specific delivery of siRNA enables silencing of target genes in specific tissues, opening the door to powerful therapeutic options for a multitude of diseases. However, development of delivery systems capable of targeted and effective siRNA delivery typically requires multiple steps and use of sophisticated, orthogonal chemistries. Previously, we developed diblock copolymers consisting of dimethaminoethyl methacrylate-b-dimethylaminoethyl methacrylate-co-butyl methacrylate-copropylacrylic acid as potent siRNA delivery systems that protect siRNA from enzymatic degradation and enable its cytosolic delivery through pH-responsive, endosomolytic behavior. These architectures were polymerized using a living radical polymerization method, specifically reversible addition-fragmentation chain transfer (RAFT) polymerization, which employs a chain transfer agent (CTA) to modulate the rate of reaction, resulting in polymers with low polydispersity and telechelic chain ends reflecting the chemistry of the CTA. Here, we describe the straightforward, facile synthesis of a folate receptor-targeted diblock copolymer siRNA delivery system, as the folate receptor is an attractive target for tumor-selective therapies due to its overexpression in a number of cancers. Specifically, we detail the de novo synthesis of a folate-functionalized CTA, use the folate-CTA for controlled polymerizations of diblock copolymers, and demonstrate efficient, specific cellular folate receptor interaction and in vitro gene knockdown using the folate-functionalized polymer.
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