Surface Plasmon Resonance Study of the Binding of PEO-PPO-PEO Triblock Copolymer and PEO Homopolymer to Supported Lipid Bilayers.

Surface Plasmon Resonance Study of the Binding of PEO-PPO-PEO Triblock Copolymer and PEO Homopolymer to Supported Lipid Bilayers.
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DOI:
10.1021/acs.langmuir.8b00873
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发表时间:
2018-06-12
期刊:
Langmuir : the ACS journal of surfaces and colloids
影响因子:
--
通讯作者:
Hackel BJ
Hackel BJ
中科院分区:
其他
文献类型:
--
作者:
Kim M;Vala M;Ertsgaard CT;Oh SH;Lodge TP;Bates FS;Hackel BJ

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泊洛沙姆188(P188)是一种聚(环氧乙烷)-b-聚(环氧丙烷)-b-聚(环氧乙烷)三嵌段共聚物,可保护细胞膜免受各种外部应力,而聚环氧乙烷(PEO; 8,600 g/mol)均聚物缺乏保护功效。作为一个全面的努力,以阐明保护机制的一部分,我们使用表面等离子体共振(SPR),以获得直接的证据支持的脂质双层上的聚合物的结合。检查并比较P188和PEO的结合动力学和覆盖率。最值得注意的是,PEO表现出与P188相当的膜缔合,这由相当的缔合速率常数和覆盖率证明。这一结果强调了需要额外的机制理解超越简单的膜协会,以解释P188在治疗应用中的差异疗效。
Poloxamer 188 (P188), a poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide) triblock copolymer, protects cell membranes against various external stresses whereas polyethylene oxide (PEO; 8,600 g/mol) homopolymer lacks protection efficacy. As part of a comprehensive effort to elucidate the protection mechanism, we used surface plasmon resonance (SPR) to obtain direct evidence of binding of the polymers onto supported lipid bilayers. Binding kinetics and coverage of the P188 and PEO were examined and compared. Most notably, the PEO exhibited comparable membrane association to that of the P188, evidenced by comparable association rate constants and coverage. This result highlights the need for additional mechanistic understanding beyond simple membrane association to explain the differential efficacy of P188 in therapeutic applications.
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