EXPERIMENTAL STUDY OF PERIPHERAL NERVE REGENERATION BY USING NON-TUBULAR NATURAL CELLULOSE MEMBRANE NERVE CONDUIT

비관형 천연 셀룰로오스막 도관을 이용한 말초신경 재생에 대한 실험적 연구

  • Kim, Soung-Min (Department of Oral and Maxillofacial Surgery, College of Dentistry, Kangnung National University) ;
  • Lee, Jong-Ho (Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Seoul National University) ;
  • Lee, Suk-Keun (Department of Oral Pathology, College of Dentistry, Kangnung National University)
  • 김성민 (강릉대학교 치과대학 구강악안면외과학교실) ;
  • 이종호 (서울대학교 치의학대학원 구강악안면외과학교실) ;
  • 이석근 (강릉대학교 치과대학 구강병리학교실)
  • Published : 2006.08.31

Abstract

Styela clava, called non-native tunicate or sea squirt, is habitat which include bays and harbors in Korea and several sites in the sea faced world. We fabricate cellulose membrane nerve conduit (CMNC) from this native sea squirt skin, and evaluate the capacity of promoting peripheral nerve regeneration in the rat sciatic nerve defect model. After processing the pure cellulose membrane from the sea squirt skin as we already published before, CMNC was designed as a non-tubular sheet with 14 mm length and 4 mm width. Total eleven male Spraque-Dawley rats (12 weeks, weighing 250 to 300g) were divided into sham group (n=2), silicone tube grafted control group (n=3) and experimental group (n=6). Each CMNC grafted nerve was evaluated after 4, 8 and 12 weeks in the experimental group, and after 12 weeks, sciatic function was evaluated with sciatic function index (SFI) and gait analysis, and histomorphology of nerve conduit and the innervated tissues of sciatic nerve were all examined using image analyzer and electromicroscopic methods in the all groups. The regenerated axon and nerve sheath were found only in the inner surface of the CMNC after 4 weeks and became more thicker after 8 and 12 weeks. In the TEM study, CMNC grafted group showed more abundant organized myelinated nerve fibers with thickened extracellular matrix than silicone conduit grafted group after 12 weeks. The sciatic function index (SFI) and ankle stance angle (ASA) in the functional evaluation were $-47.2{\pm}3.9$, $35.5^{\circ}{\pm}4.9^{\circ}$ in CMNC grafted group (n=2) and $-80.4{\pm}7.4$, $29.2^{\circ}{\pm}5.3^{\circ}$ in silicone conduit grafted group (n=3), respectively. And the myelinated axon was 41.59% in CMNC group and 9.51% in silicone conduit group to the sham group. The development of a bioactive CMNC to replace autogenous nerve grafts offers a potential and available approach to improved peripheral nerve regeneration. As we already published before, small peptide fragment derived from the basement membrane matrix proteins of squirt skin, which is a kind of anchoring protein composed of glycocalyx, induced the effective axonal regeneration with rapid growth of Schwann cells beneath the inner surface of CMNC. So the possibilities of clinical application as a peripheral nerve regeneration will be able to be suggested.

Keywords

References

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