Targeting extracellular DNA to deliver IGF-1 to the injured heart.

Targeting extracellular DNA to deliver IGF-1 to the injured heart.
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靶向细胞外DNA,以将IGF-1输送到受伤的心脏。

DOI:
10.1038/srep04257
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发表时间:
2014-03-07
期刊:
影响因子:
4.6
通讯作者:
Davis ME
Davis ME
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Khan RS;Martinez MD;Sy JC;Pendergrass KD;Che PL;Brown ME;Cabigas EB;Dasari M;Murthy N;Davis ME

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非常需要开发能够将生物分子靶向损伤心肌的治疗策略。心肌梗死(MI)期间心肌坏死的特征在于细胞外DNA的释放,其可作为缺血组织的潜在靶点。Hoechst是一种与双链DNA结合的组织学染色剂,可与多种分子结合。胰岛素样生长因子-1(IGF-1)是一种循环半衰期较短的小蛋白/多肽,在MI后具有心脏保护作用,但其临床应用受到递送不良的限制,因为心肌内注射的保留性较差,并且长期全身存在具有不良副作用。在这里,我们提出了一种新的IGF-1运载工具,通过其共轭Hoechst靶向梗死组织。使用小鼠缺血再灌注模型,我们证明了Hoechst-IGF-1的静脉内递送导致Akt的激活,Akt是IGF-1的下游靶点,并防止MI后的心脏纤维化和功能障碍。
There is a great need for the development of therapeutic strategies that can target biomolecules to damaged myocardium. Necrosis of myocardium during a myocardial infarction (MI) is characterized by extracellular release of DNA, which can serve as a potential target for ischemic tissue. Hoechst, a histological stain that binds to double-stranded DNA can be conjugated to a variety of molecules. Insulin-like growth factor-1 (IGF-1), a small protein/polypeptide with a short circulating-half life is cardioprotective following MI but its clinical use is limited by poor delivery, as intra-myocardial injections have poor retention and chronic systemic presence has adverse side effects. Here, we present a novel delivery vehicle for IGF-1, via its conjugation to Hoechst for targeting infarcted tissue. Using a mouse model of ischemia-reperfusion, we demonstrate that intravenous delivery of Hoechst-IGF-1 results in activation of Akt, a downstream target of IGF-1 and protects from cardiac fibrosis and dysfunction following MI.
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