Nerve guidance conduits (NGCs) are considered as promising treatment strategy and frontier trend for peripheral nerve regeneration, while their therapeutic outcomes are limited by the lack of controllable drug delivery and available physicochemical cues. Herein, novel aligned piezoelectric nanofibers derived hydrogel NGCs with ultrasound (US)-triggered electrical stimulation (ES) and controllable drug release for repairing peripheral nerve injury are proposed. The inner layer of the NGCs is the barium titanate piezoelectric nanoparticles (BTNPs)-doped polyvinylidene fluoride-trifluoroethylene [BTNPs/P(VDF-TrFE)] electrospinning nanofibers with improved piezoelectricity and aligned orientation. The outer side of the NGCs is the thermoresponsive poly(N-isopropylacrylamide) hybrid hydrogel with bioactive drug encapsulation. Such NGCs can not only induce neuronal-oriented extension and promote neurite outgrowth with US-triggered wireless ES, but also realize the controllable nerve growth factor release with the hydrogel shrinkage under US-triggered heating. Thus, the NGC can positively accelerate the functional recovery and nerve axonal regeneration of rat models with long sciatic nerve defects. It is believed that the proposed US-responsive aligned piezoelectric nanofibers derived hydrogel NGCs will find important applications in clinic neural tissue engineering. Aligned piezoelectric nanofibers derived hydrogel nerve guidance conduits for peripheral nerve regeneration are proposed. The aligned piezoelectric nanofibers inner layer possesses aligned orientation and US-triggered electrical stimulation, while poly(N-isopropylacrylamide) hybrid hydrogel outer layer provides controllable drug release to promote nerve regeneration. Such conduits can positively accelerate the functional recovery and nerve regeneration of rats with long sciatic nerve defects. image
基金:
National Natural Science Foundation of China; National Key R&D Program of China [2020YFB1313100, 2021YFA1101300, 2021YFA1101800, 2020YFA0112503]; Natural Science Foundation of Jiangsu Province [BK20232007]; Guangdong Basic and Applied Basic Research Foundation [2021B1515120054, 2022B1515120026, 2023A1515011986]; Shenzhen Science and Technology Program [JCYJ20190813152616459, JCYJ20210324133214038, JCYJ20190814093401920, JCYJ20210324125608022]; Science and Technology Department of Sichuan Province [2021YFS0371]; Open Project Fund of Guangdong Academy of Medical Sciences [YKY-KF202201]; Futian Healthcare Research Project [FTWS2022013, FTWS2023080]; [22002018]; [52073060]; [82330033]; [82030029]; [92149304]; [22302231]