Electric field stimulation through a biodegradable polypyrrole-co-polycaprolactone substrate enhances neural cell growth.

Electric field stimulation through a biodegradable polypyrrole-co-polycaprolactone substrate enhances neural cell growth.
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通过可生物降解的多吡咯-O-polycaprolactone底物通过可生物降解的电场刺激增强了神经细胞的生长。

DOI:
10.1002/jbm.a.34925
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发表时间:
2014-08
影响因子:
4.9
通讯作者:
Schmidt, Christine E.
Schmidt, Christine E.
中科院分区:
工程技术3区
文献类型:
--
作者:
Nguyen, Hieu T.;Sapp, Shawn;Wei, Claudia;Chow, Jacqueline K.;Alvin Nguyen;Coursen, Jeff;Luebben, Silvia;Chang, Emily;Ross, Robert;Schmidt, Christine E.

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神经引导导管(NGC)是FDA批准的设备,用于桥接切断的神经电缆之间的间隙,并帮助引导轴突从近端长向远端残端。在本文中,我们提出了一种新的导电,可生物降解的NGC由聚吡咯-嵌段-聚己内酯(PPy-PCL)共聚物材料与聚(乳酸-羟基乙酸)(PLGA)层压制成的发展。PPy-PCL的体积电导率范围为10-20 S/cm,在生理条件下7个月后损失40重量%。与在没有暴露于100 mV/cm直流电场(EF)的相同基底上生长的对照相比,在暴露于100 mV/cm直流电场(EF)2 h的平坦PPy-PCL/PLGA材料上生长的背根神经节(DRG)使轴突向2电极设置的任一电极生长增加13%(± 2%)。与相同的对照组相比,交流电使轴突生长增加了21%(± 3%),而没有观察到方向偏好。本研究的结果表明,PLGA涂层PPy-PCL是一种独特的可生物降解材料,可以提供基质EF刺激,以改善轴突生长,用于周围神经修复。
Nerve guidance conduits (NGCs) are FDA-approved devices used to bridge gaps across severed nerve cables and help direct axons sprouting from the proximal end toward the distal stump. In this paper we present the development of a novel electrically conductive, biodegradable NGC made from a polypyrrole-block-polycaprolactone (PPy-PCL) copolymer material laminated with poly(lactic-co-glycolic acid) (PLGA). The PPy-PCL has a bulk conductivity ranging 10–20 S/cm and loses 40 wt% after 7 months under physiologic conditions. Dorsal root ganglia (DRG) grown on flat PPy-PCL/PLGA material exposed to direct current electric fields (EF) of 100 mV/cm for 2 h increased axon growth by 13% (± 2%) towards either electrode of a 2-electrode setup, compared to control grown on identical substrates without EF exposure. Alternating current increased axon growth by 21% (± 3%) without an observable directional preference, compared to the same control group. The results from this study demonstrate PLGA-coated PPy-PCL is a unique biodegradable material that can deliver substrate EF stimulation to improve axon growth for peripheral nerve repair.
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