Tendon chitosan tubes covalently coupled with synthesized laminin peptides facilitate nerve regeneration in vivo.
We have developed tendon chitosan tubes having the ability to bind peptides covalently, and the effectiveness of laminin peptides coupled to these tubular wall on nerve regeneration was examined in vivo. Bridge graft implantation (15 mm) into the sciatic nerve of SD rats was carried out using chitosan tubes having a triangular cross section containing either covalently bound intact laminin or the laminin peptides CDPGYIGSR or CSRARKQAASIKVAVSAD or being nontreated (N = 20 in each group). As a control, isografting (N = 5) was carried out. Three rats in each experimental group were sacrificed for histology observations after 1, 2, 4, 6, and 8 weeks. The total area of regenerating tissue in the tube and the length of the area where regenerating tissue attached to the inner surface of the tube were measured. In five rats from each experimental and control group, the latency quotient between the implanted and the nontreated site was determined 12 weeks after implantation. Furthermore, the percentage of myelinated axon area was measured at a 10-mm distance from the distal anastomosed site. Histological findings suggest that the immobilized laminin, confirmed by immunostaining as long as 12 weeks postoperatively, as well as laminin oligopeptides may effectively assist nerve tissue extension. According to statistical analysis of the percentage neural tissue found in relation to evoked action potentials, the sequential treatments with YIGSR first followed by IKVAV matched the effectiveness of intact laminin in enhancing nerve regeneration. However, when compared with that after isografting, the enhancement of regenerated axon growth was less sufficient.
Department of Plastic Surgery, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan.
Masumi
M
Suzuki
Soichiro
S
Itoh
Isamu
I
Yamaguchi
Kazuo
K
Takakuda
Hisatoshi
H
Kobayashi
Kenichi
K
Shinomiya
Junzo
J
Tanaka
D020341:Absorbable Implants / Q000592:standards* / Q000639:trends; D000200:Action Potentials / Q000187:drug effects / Q000502:physiology; D000818:Animals; D001369:Axons / Q000187:drug effects / Q000378:metabolism / Q000648:ultrastructure; D003386:Brachyura; D002686:Chitin / Q000031:analogs & derivatives* / Q000494:pharmacology* / Q000627:therapeutic use; D048271:Chitosan; D007797:Laminin / Q000138:chemical synthesis / Q000494:pharmacology* / Q000627:therapeutic use; D008297:Male; D008854:Microscopy, Electron; D009186:Myelin Sheath / Q000187:drug effects / Q000378:metabolism / Q000648:ultrastructure; D009416:Nerve Regeneration / Q000187:drug effects* / Q000502:physiology; D010455:Peptides / Q000138:chemical synthesis / Q000494:pharmacology / Q000627:therapeutic use; D051381:Rats; D017207:Rats, Sprague-Dawley; D020127:Recovery of Function / Q000187:drug effects / Q000502:physiology; D012583:Schwann Cells / Q000187:drug effects / Q000378:metabolism / Q000648:ultrastructure; D012584:Sciatic Nerve / Q000187:drug effects / Q000601:surgery* / Q000648:ultrastructure; D020426:Sciatic Neuropathy / Q000188:drug therapy / Q000601:surgery*; D013710:Tendons / Q000737:chemistry / Q000637:transplantation; D016896:Treatment Outcome
D007797:Laminin; D010455:Peptides; D002686:Chitin; D048271:Chitosan