title: Phosphate glass fibres promote neurite outgrowth and early regeneration in a peripheral nerve injury model.
abstract: Three-dimensional (3D) scaffolds, which are bioactive and aid in neuronal guidance, are essential in the repair and regeneration of injured peripheral nerves. In this study, we used novel inorganic microfibres guided by phosphate glass (PG). PG fibres (PGfs) were aligned on compressed collagen that was rolled into a nerve conduit. In vitro tests confirmed that adult dorsal root ganglion (DRG) neurons showed active neurite outgrowth along the fibres, with a maximum number and length of neurites being significantly higher than those cultured on tissue culture plastic. In vivo experiments with nerve conduits that either contained PGfs (PGf/Col) or lacked them (Col) were conducted on transected sciatic nerves of rats for up to 12 weeks. One week after implantation, the PGf/Col group showed many axons extending along the scaffold, whereas the Col group showed none. Eight weeks after implantation, the PGf/Col group exhibited greater recovery of plantar muscle atrophy than the Col group. Electrophysiological studies revealed that some animals in the PGf/Col group at 6 and 7 weeks post-implantation (5.3% and 15.8%, respectively) showed compound muscle action potential. The Col group over the same period showed no response. Motor function also showed faster recovery in the PGf/Col group compared to the Col group up to 7 weeks. However, there was no significant difference in the number of axons, muscle atrophy or motor and sensory functions between the two groups at 12 weeks post-implantation. In summary, phosphate glass fibres can promote directional growth of axons in cases of peripheral nerve injury by acting as physical guides.
authors.affiliation: Department of Nanobiomedical Science, Dankook University, Cheonan, Republic of Korea; Institute of Tissue Regeneration Engineering, Dankook University, Cheonan, Republic of Korea.
authors.forename: Young-Phil
authors.initials: YP
authors.lastname: Kim
authors.forename: Gil-Su
authors.initials: GS
authors.lastname: Lee
authors.forename: Jong-Wan
authors.initials: JW
authors.lastname: Kim
authors.forename: Min Soo
authors.initials: MS
authors.lastname: Kim
authors.forename: Hong-Sun
authors.initials: HS
authors.lastname: Ahn
authors.forename: Jae-Young
authors.initials: JY
authors.lastname: Lim
authors.forename: Hae-Won
authors.initials: HW
authors.lastname: Kim
authors.forename: Young-Jin
authors.initials: YJ
authors.lastname: Son
authors.forename: Jonathan C
authors.initials: JC
authors.lastname: Knowles
authors.forename: Jung Keun
authors.initials: JK
authors.lastname: Hyun
mesh_terms: D000818:Animals; D004195:Disease Models, Animal; D005260:Female; D005898:Glass; D016501:Neurites / Q000378:metabolism* / Q000473:pathology; D059348:Peripheral Nerve Injuries / Q000378:metabolism / Q000503:physiopathology / Q000628:therapy; D051381:Rats; D017207:Rats, Sprague-Dawley; D020127:Recovery of Function; D013997:Time Factors
chemical_list: C009753:fiberglass