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Comparative Study of the L5 Spinal Nerve Transection Model and Sciatic Nerve Axotomy Model as a Peripheral Nerve Injury Model in Rat

Song Dae Yong 1,  Ji Hye Lee 1,  유하늘 1,  박채리 1,  Ran-Sook Woo 1,  Hong Sung Youp 2,  전영희 3,  Hyung Nam Koo 4,  백태경 1

1을지대학교
2가톨릭대학교
3영남대학교
4국립과학수사연구원

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ABSTRACT

The aim of this study was to propose new more reliable peripheral nerve transection model to overcome the defect of the traditional sciatic axotomy model by specifically transecting L5 spinal nerve just after emerging from the intervertebral foramen and confining analysis area to the L5 spinal segment. The adult male Sprague-Dawley rats, weighing 300~350 g at the time of surgery, were used for the experiments. Four different experimental groups were used. 1. Sciatic nerve transection (Sc-Tx) group: transect the sciatic nerve in the popliteal fossa where it divided into the common peroneal nerve and tibial nerve. 2. L5spinal nerve transection (L5-Tx) group: L5 spinal nerve was specifically transected. 3. Suture (Su) group: L5spinal nerve was transected and immediately sutured. 4. Control group: the same surgical procedure with L5spinal nerve transection group was performed except for the excision of L5 spinal nerve. To distinguish L5motoneurons from the other level ones, the animals were received the retrograde tracer, FluoroGold into the axotomized proximal nerve stump. Serial coronal frozen sections at 40 μm thick through the L4 to L6 spinal segment was performed and the resultant total number of sections was about 180. Approximate serial 50 sections (approximately 2 mm) could be considered as the L5 segment based on the number of the fluorescent signals (above 20). L5 spinal segment could be differentiated from L4 and L6 segment based on their morphological characteristics under Cresyl violet stain. In L5-Tx group, at 2 and 4 weeks post-transection, the number of L5 spinal motoneurons was reduced by 8%. Meanwhile, Sc-Tx and Su groups showed no statistically notable changes. In this study, the authors could propose more reliable peripheral nerve axotomy model than the conventional sciatic nerve axotomy model by specifically transecting L5 spinal nerve and confining the investigating area within the L5 spinal segment.

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* References for papers published after 2023 are currently being built.

This paper was written with support from the National Research Foundation of Korea.
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