Size-dependent long-term tissue response to biostable nanowires in the brain.
Author
Summary, in English
Nanostructured neural interfaces, comprising nanotubes or nanowires, have the potential to overcome the present hurdles of achieving stable communication with neuronal networks for long periods of time. This would have a strong impact on brain research. However, little information is available on the brain response to implanted high-aspect-ratio nanoparticles, which share morphological similarities with asbestos fibres. Here, we investigated the glial response and neuronal loss in the rat brain after implantation of biostable and structurally controlled nanowires of different lengths for a period up to one year post-surgery. Our results show that, as for lung and abdominal tissue, the brain is subject to a sustained, local inflammation when biostable and high-aspect-ratio nanoparticles of 5 μm or longer are present in the brain tissue. In addition, a significant loss of neurons was observed adjacent to the 10 μm nanowires after one year. Notably, the inflammatory response was restricted to a narrow zone around the nanowires and did not escalate between 12 weeks and one year. Furthermore, 2 μm nanowires did not cause significant inflammatory response nor significant loss of neurons nearby. The present results provide key information for the design of future neural implants based on nanomaterials.
Publishing year
2015
Language
English
Pages
172-183
Publication/Series
Biomaterials
Volume
42
Links
Document type
Journal article
Publisher
Elsevier
Topic
- Bioengineering Equipment
Status
Published
Project
- Vävnadsreaktioner i nervsystemet efter elektrodimplantation
Research group
- Neuronano Research Center (NRC)
- Neurophysiology
ISBN/ISSN/Other
- ISSN: 1878-5905