Electrical stimulation to conductive scaffold promotes axonal regeneration and remyelination in a rat model of large nerve defect.
BACKGROUND
Electrical stimulation (ES) has been shown to promote nerve regeneration when it was applied to the proximal nerve stump. However, the possible beneficial effect of establishing a local electrical environment between a large nerve defect on nerve regeneration has not been reported in previous studies. The present study attempted to establish a local electrical environment between a large nerve defect, and examined its effect on nerve regeneration and functional recovery.


RESULTS
In the present study, a conductive scaffold was constructed and used to bridge a 15 mm sciatic nerve defect in rats, and intermittent ES (3 V, 20 Hz) was applied to the conductive scaffold to establish an electrical environment at the site of nerve defect. Nerve regeneration and functional recovery were examined after nerve injury repair and ES. We found that axonal regeneration and remyelination of the regenerated axons were significantly enhanced by ES which was applied to conductive scaffold. In addition, both motor and sensory functional recovery was significantly improved and muscle atrophy was partially reversed by ES localized at the conductive scaffold. Further investigations showed that the expression of S-100, BDNF (brain-derived neurotrophic factor), P0 and Par-3 was significantly up-regulated by ES at the conductive scaffold.


CONCLUSIONS
Establishing an electrical environment with ES localized at the conductive scaffold is capable of accelerating nerve regeneration and promoting functional recovery in a 15 mm nerve defect in rats. The findings provide new directions for exploring regenerative approaches to achieve better functional recovery in the treatment of large nerve defect.
Institute of Orthopaedics, Xijing Hospital, The Fourth Military Medical University, Xi'an, China.
Jinghui
J
Huang
Lei
L
Lu
Jianbin
J
Zhang
Xueyu
X
Hu
Yongguang
Y
Zhang
Wei
W
Liang
Siyu
S
Wu
Zhuojing
Z
Luo
D000200:Action Potentials; D000818:Animals; D001369:Axons / Q000473:pathology / Q000502:physiology*; D019208:Brain-Derived Neurotrophic Factor / Q000096:biosynthesis; D002352:Carrier Proteins / Q000096:biosynthesis; D048271:Chitosan / Q000737:chemistry; D004195:Disease Models, Animal; D004558:Electric Stimulation; D004594:Electrophysiology / Q000379:methods; D008297:Male; D018993:Myelin P0 Protein / Q000096:biosynthesis; D009186:Myelin Sheath / Q000378:metabolism*; D009416:Nerve Regeneration / Q000502:physiology*; D009419:Nerve Tissue Proteins; D009474:Neurons / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D009418:S100 Proteins / Q000096:biosynthesis; D012584:Sciatic Nerve / Q000473:pathology; D015854:Up-Regulation
D019208:Brain-Derived Neurotrophic Factor; D002352:Carrier Proteins; D018993:Myelin P0 Protein; D009419:Nerve Tissue Proteins; C472451:Pard3 protein, rat; D009418:S100 Proteins; D048271:Chitosan