Impact of degradable nanowires on long-term brain tissue responses

Journal of Nanobiotechnology

Research

Lina Gällentoft¹  Nils Danielsen¹  Cecilia Eriksson Linsmeier¹  Lina M. E. Pettersson¹  Jens Schouenborg¹  Christelle N. Prinz² 

[1] Department of Experimental Medical Science, Medical Faculty, Neuronano Research Center (NRC), Lund University, Scheelevägen 2, 223 81, Lund, Sweden;Department of Experimental Medical Science, Medical Faculty, Neuronano Research Center (NRC), Lund University, Scheelevägen 2, 223 81, Lund, Sweden;Division of Solid State Physics/NanoLund, Lund University, P.O. Box 118, 221 00, Lund, Sweden;

关键词: Nanowires;    Biocompatibility;    Neural interfaces;    Brain;    Biomaterial;    Foreign body reaction;    Tissue responses;    Immunohistochemistry;    Nanomedicine;   

DOI  :  10.1186/s12951-016-0216-7

 received in 2016-04-09, accepted in 2016-08-03,  发布年份 2016

来源: Springer

【 摘 要 】

BackgroundA promising approach to improve the performance of neural implants consists of adding nanomaterials, such as nanowires, to the surface of the implant. Nanostructured interfaces could improve the integration and communication stability, partly through the reduction of the cell-to-electrode distance. However, the safety issues of implanted nanowires in the brain need to be evaluated and understood before nanowires can be used on the surface of implants for long periods of time. To this end we here investigate whether implanted degradable nanowires offer any advantage over non-degradable nanowires in a long-term in vivo study (1 year) with respect to brain tissue responses.ResultsThe tissue response after injection of degradable silicon oxide (SiOx)-coated gallium phosphide nanowires and biostable hafnium oxide-coated GaP nanowires into the rat striatum was compared. One year after nanowire injection, no significant difference in microglial or astrocytic response, as measured by staining for ED1 and glial fibrillary acidic protein, respectively, or in neuronal density, as measured by staining for NeuN, was found between degradable and biostable nanowires. Of the cells investigated, only microglia cells had engulfed the nanowires. The SiOx-coated nanowire residues were primarily seen in aggregated hypertrophic ED1-positive cells, possibly microglial cells that have fused to create multinucleated giant cells. Occasionally, degradable nanowires with an apparently intact shape were found inside single, small ED1-positive cells. The biostable nanowires were found intact in microglia cells of both phenotypes described.ConclusionThe present study shows that the degradable nanowires remain at least partly in the brain over long time periods, i.e. 1 year; however, no obvious bio-safety issues for this degradable nanomaterial could be detected.

【 授权许可】

CC BY   
© The Author(s) 2016