Lipid Membrane Binding and Cell Protection Efficacy of Poly(1,2-butylene oxide)-b-poly(ethylene oxide) Copolymers.

Lipid Membrane Binding and Cell Protection Efficacy of Poly(1,2-butylene oxide)-b-poly(ethylene oxide) Copolymers.
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聚(1,2-丁基氧化物)-b-聚(氧化乙烷)共聚物的脂质膜结合和细胞保护功效。

DOI:
10.1021/acs.biomac.1c01661
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发表时间:
2022-03-14
期刊:
影响因子:
6.2
通讯作者:
Lodge, Timothy P.
Lodge, Timothy P.
中科院分区:
化学2区
文献类型:
--
作者:
Van Zee, Nicholas J.;Peroutka, Amanda S.;Crabtree, Adelyn;Hillmyer, Marc A.;Lodge, Timothy P.

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由聚(环氧乙烷)(PEO)和聚(环氧丙烷)链段组成的泊洛沙姆可以保护细胞膜免受各种形式的应力。我们研究了疏水嵌段化学对聚合物/膜结合和细胞膜保护的作用,通过比较一系列聚(环氧丁烷)-b-PEO(PBO-b-PEO)共聚物泊洛沙姆类似物,使用脉冲场梯度(PFG)NMR实验和乳酸脱氢酶(LDH)细胞测定的组合。我们发现,与PPO/PEO共聚物相比,更疏水的PBO-b-PEO共聚物更显著地结合到由1-棕榈醇-2-油酰基-甘油-3-磷酸胆碱(POPC)组成的模型脂质体。然而,当通过LDH测定进行比较时,两类聚合物的表现相似。这些结果提出了一个重要的聚合物之间的比较具有相似的结构,但具有不同的结合亲和力。它们还提供了机制见解,因为增强的聚合物/脂质膜结合在LDH测定中并不直接转化为增加的细胞保护,因此在尝试实现更大的膜保护功效时需要考虑其他因素。
Poloxamers consisting of poly(ethylene oxide) (PEO) and poly(propylene oxide) segments can protect cell membranes against various forms of stress. We investigated the role of the hydrophobic block chemistry on polymer/membrane binding and cell membrane protection by comparing a series of poly(butylene oxide)-b-PEO (PBO-b-PEO) copolymers to poloxamer analogues, using a combination of pulsed-field-gradient (PFG) NMR experiments and a lactate dehydrogenase (LDH) cell assay. We found that the more hydrophobic PBO-b-PEO copolymers bound more significantly to model liposomes composed of 1-palmitol-2-oleoyl-glycero-3-phosphocholine (POPC) compared to PPO/PEO copolymers. However, both classes of polymers performed similarly when compared by an LDH assay. These results present an important comparison between polymers with similar structures but with different binding affinities. They also provide mechanistic insight as enhanced polymer/lipid membrane binding did not directly translate to increased cell protection in the LDH assay, and therefore additional factors need to be considered when trying to achieve greater membrane protection efficacy.
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