Abstract: | |
We report on the performance of composite nerve grafts with an inner 3D multichannel porous chitosan core and an outer electrospun polycaprolactone shell. The inner chitosan core provided multiple guidance channels for regrowing axons. To analyze the in vivo properties of the bare chitosan cores, we separately implanted them into an epineural sheath. The effects of both graft types on structural and functional regeneration across a 10 mm rat sciatic nerve gap were compared to autologous nerve transplantation (ANT). The mechanical biomaterial properties and the immunological impact of the grafts were assessed with histological techniques before and after transplantation in vivo. Furthermore during a 13-week examination period functional tests and electrophysiological recordings were performed and supplemented by nerve morphometry. The sheathing of the chitosan core with a polycaprolactone shell induced massive foreign body reaction and impairment of nerve regeneration. Although the isolated novel chitosan core did allow regeneration of axons in a similar size distribution as the ANT, the ANT was superior in terms of functional regeneration. We conclude that an outer polycaprolactone shell should not be used for the purpose of bioartificial nerve grafting, while 3D multichannel porous chitosan cores could be candidate scaffolds for structured nerve grafts.
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License of this version: | CC BY 3.0 Unported - https://creativecommons.org/licenses/by/3.0/ |
Publication type: | Article |
Publishing status: | publishedVersion |
Publication date: | 2014 |
Keywords english: | chitosan, polycaprolactone, biomaterial, chitosan, polycaprolactone, polyester, adult, animal experiment, article, automutilation, controlled study, electric field, electrophysiological procedures, electrospinning, extracellular space, female, foreign body reaction, freeze drying, giant cell, in vivo study, microenvironment, nerve fiber regeneration, nerve transplantation, nociception, nonhuman, peripheral nerve, rat, scanning electron microscopy, sciatic nerve, animal, chemically induced, convalescence, drug effects, electrodiagnosis, foreign body reaction, inflammation, motor activity, muscle, nerve fiber, nerve regeneration, organ size, pathology, pathophysiology, procedures, tissue regeneration, tissue scaffold, Wistar rat, Animals, Axons, Biocompatible Materials, Chitosan, Electrodiagnosis, Female, Foreign-Body Reaction, Guided Tissue Regeneration, Inflammation, Microscopy, Electron, Scanning, Motor Activity, Muscles, Nerve Regeneration, Organ Size, Pain Perception, Polyesters, Rats, Wistar, Recovery of Function, Tissue Scaffolds |
DDC: | 600 | Technik, 610 | Medizin, Gesundheit, 570 | Biowissenschaften, Biologie |
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