Guanidinylated neomycin mediates heparan sulfate-dependent transport of active enzymes to lysosomes.

Guanidinylated neomycin mediates heparan sulfate-dependent transport of active enzymes to lysosomes.
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胍基化新霉素介导硫酸乙酰肝素依赖性活性酶向溶酶体的转运。

DOI:
10.1038/mt.2010.78
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发表时间:
2010
期刊:
Molecular therapy : the journal of the American Society of Gene Therapy
影响因子:
--
通讯作者:
Esko,JeffreyD
Esko,JeffreyD
中科院分区:
--
文献类型:
--
作者:
Sarrazin,Stéphane;Wilson,Beth;Sly,WilliamS;Tor,Yitzhak;Esko,JeffreyD

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胍基化新霉素(GNeo)可以在依赖于细胞表面硫酸乙酰肝素蛋白聚糖的过程中将生物活性的高分子量货物转运到细胞内部。在这份报告中,我们表明,GNeo修饰的量子点结合到细胞表面硫酸乙酰肝素,进行内吞作用,并最终到达溶酶体室。制备了一种N-羟基琥珀酰亚胺活化的GNeo酯(GNeo-NHS),并将其与两种溶酶体酶β-d-葡萄糖醛酸酶(GUS)和α-l-艾杜糖醛酸酶偶联。缀合不干扰酶活性,并且使酶能够与原代人成纤维细胞上的肝素-琼脂糖凝胶和硫酸乙酰肝素结合。缺乏相应溶酶体酶的细胞摄取足够量的结合酶以恢复糖胺聚糖的正常周转。蛋白聚糖介导的高摄取能力表明,这种递送方法可用于酶替代或将外源酶引入细胞。
Guanidinylated neomycin (GNeo) can transport bioactive, high molecular weight cargo into the interior of cells in a process that depends on cell surface heparan sulfate proteoglycans. In this report, we show that GNeo-modified quantum dots bind to cell surface heparan sulfate, undergo endocytosis and eventually reach the lysosomal compartment. AnN-hydroxysuccinimide activated ester of GNeo (GNeo-NHS) was prepared and conjugated to two lysosomal enzymes, β-d-glucuronidase (GUS) and α-l-iduronidase. Conjugation did not interfere with enzyme activity and enabled binding of the enzymes to heparin-Sepharose and heparan sulfate on primary human fibroblasts. Cells lacking the corresponding lysosomal enzyme took up sufficient amounts of the conjugated enzymes to restore normal turnover of glycosaminoglycans. The high capacity of proteoglycan-mediated uptake suggests that this method of delivery might be used for enzyme replacement or introduction of foreign enzymes into cells.
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