Time course study of long-term biocompatibility and foreign body reaction to intraneural polyimide-based implants
de la Oliva, Natalia (Universitat Autònoma de Barcelona. Institut de Neurociències)
Navarro, X. (Xavier) (Xavier) (Universitat Autònoma de Barcelona. Institut de Neurociències)
Del Valle, Jaume (Institut Català de Nanociència i Nanotecnologia)

Data:	2018
Resum:	The foreign body reaction (FBR) against an implanted device is characterized by the formation of a fibrotic tissue around the implant. In the case of interfaces for peripheral nerves, used to stimulate specific group of axons and to record different nerve signals, the FBR induces a matrix deposition around the implant creating a physical separation between nerve fibers and the interface that may reduce its functionality over time. In order to understand how the FBR to intraneural interfaces evolves, polyimide non-functional devices were implanted in rat peripheral nerve. Functional tests (electrophysiological, pain and locomotion) and histological evaluation demonstrated that implanted devices did not cause any alteration in nerve function, in myelinated axons or in nerve architecture. The inflammatory response due to the surgical implantation decreased after 2 weeks. In contrast, inflammation was higher and more prolonged in the device implanted nerves with a peak after 2 weeks. With regard to tissue deposition, a tissue capsule appeared soon around the devices, acquiring maximal thickness at 2 weeks and being remodeled subsequently. Immunohistochemical analysis revealed two different cell types implicated in the FBR in the nerve: macrophages as the first cells in contact with the interface and fibroblasts that appear later at the edge of the capsule. Our results describe how the FBR against a polyimide implant in the peripheral nerve occurs and which are the main cellular players. Increasing knowledge of these responses will help to improve strategies to decrease the FBR against intraneural implants and to extend their usability.
Ajuts:	European Commission 611687 Instituto de Salud Carlos III CB06-05-1105 Instituto de Salud Carlos III RD12-0019-0011 Ministerio de Economía y Competitividad SEV-2013-0295
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Matèria:	Foreign body reaction ; Peripheral nerve interface ; Biocompatibility ; Polyimide ; Nerve electrode
Publicat a:	Journal of biomedical materials research : Part A, Vol. 106, Issue 3 (March 2018) , p. 746-757, ISSN 1552-4965

DOI: 10.1002/jbm.a.36274

Preprint 36 p, 1.9 MB

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Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències de la salut i biociències > Institut de Neurociències (INc)
Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > Institut Català de Nanociència i Nanotecnologia (ICN2)
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