Tumor-targeted HPMA copolymer-(RGDfK)-(CHX-A''-DTPA) conjugates show increased kidney accumulation.

Tumor-targeted HPMA copolymer-(RGDfK)-(CHX-A''-DTPA) conjugates show increased kidney accumulation.
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DOI:
10.1016/j.jconrel.2008.07.014
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发表时间:
2008-12-18
影响因子:
10.8
通讯作者:
Ghandehari, Hamidreza
Ghandehari, Hamidreza
中科院分区:
医学1区
文献类型:
--
作者:
Borgman, Mark P.;Coleman, Tomika;Kolhatkar, Rohit B.;Geyser-Stoops, Sandra;Line, Bruce R.;Ghandehari, Hamidreza

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针对αvβ3整合素的N-(2-羟丙基甲基丙烯酰胺)共聚物-RGDfK结合物已显示出在实体肿瘤中积累的增加,并有望选择性地将放射治疗药物输送到血管生成或肿瘤表达的αvβ3整合素部位。实体肿瘤靶向放射治疗的一个悬而未决的问题是对非靶器官的毒性。为了降低放射性标记结合物的毒性,我们合成了不同分子量和电荷含量的HPMA共聚-RGDfK结合物,以帮助识别一种聚合物结构,该结构最大限度地增加了肿瘤的积累,同时快速从非靶向器官清除。内皮细胞结合研究表明,约43 kD、20 kD和10kD的共聚物结合物能与αvβ3整合素结合。核素成像显示,在荷瘤小鼠中,铟-111放射性标记的结合物在1小时内从血池中迅速清除,并有较高的肾脏蓄积。生物分布数据证实了肾脏高蓄积(43kD结合物最大210%ID/g)和低肿瘤积聚(43kD结合物最大1.8%ID/g)的图像。在体外主动结合αvβ3整合素的同时,HPMA共聚物-RGDfK通过侧链中CHX-A“-DTPA螯合剂含量的增加而结合负电荷,导致肾脏蓄积增加,体内肿瘤结合丧失。
N-(2-hydroxypropyl) methacrylamide (HPMA) copolymer-RGDfK conjugates targeting the αvβ3 integrin have shown increased accumulation in solid tumors and promise for selective delivery of radiotherapeutics to sites of angiogenesis- or tumor-expressed αvβ3 integrin. An unresolved issue in targeting radiotherapeutics to solid tumors is toxicity to non-target organs. To reduce toxicity of radiolabeled conjugates, we have synthesized HPMA copolymer-RGDfK conjugates with varying molecular weight and charge content to help identify a polymeric structure that maximizes tumor accumulation while rapidly clearing from non-targeted organs. Endothelial cell binding studies showed that copolymer conjugates of approximately 43, 20 and 10 kD actively bind to the αvβ3 integrin. Scintigraphic images showed rapid clearance of indium-111 radiolabeled conjugates from the blood pool and high kidney accumulation within 1 h in tumor bearing mice. Biodistribution data confirms images with high accumulation in kidney (max 210% ID/g for 43 kD conjugate) and lower tumor accumulation (max 1.8% ID/g for 43kD conjugate). While actively binding to the αvβ3 integrin in vitro, HPMA copolymer-RGDfK conjugates with increased negative charge through increased CHX-A″-DTPA chelator content in the side chains causes increased kidney accumulation with a loss of tumor binding in vivo.
DOI: 10.1002/apmc.1978.050700110
发表时间: 1978-01-01
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