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Characteristic Improvement of the Function following Schwann Cell Transplantation for Demyelinated Spinal Cord Toshio IMAIZUMI 1,2,3 , Karen L Lankford 2,3 , Jeffery D Kocsis 2,3 , Osamu HONMOU 1,2,3 , Ikuhide KOHAMA 1,2,3 , Kazuo HASHI 1 1Department of Neurosurgery, Sapporo Medical University School of Medicine 2Department of Neurology, Yale University School of Medicine 3Neuroscience Research Center, VA Medical Center Keyword: CNS , Demyelination , Remyelination , Transplantation , Schwann cell pp.705-711
Published Date 2000/8/10
DOI https://doi.org/10.11477/mf.1436901925
  • Abstract
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Transplantation of Schwann cells (SCs) induced remyelination of demyelinated rat dorsal column (DC) axons and improved conduction. To investigate the difference between oligodendrocyte (OL) and SC myelination in conductive functions of axons, we compared normal DCs, demyelinated DCs, demyelinated DCs remyelinated by SC transplantation, and normal dorsal roots. All of the axons was originated from dorsal root ganglion neurons.

Dorsal roots of adult rats were demyelinated at T11 by X-ray irradiation and ethidium bromide, and transplanted with SCs (3×104) of adult rats. Three weeks later, the spinal cord was removed and pinned in a recording chamber and compound action potentials (CAPs) were recorded, to investigate conduction properties (conduction velocity and response after high frequency stimulation). Normal DCs or dorsal roots were recorded in same manner.

Following transplantation of SCs, histological examination revealed SC-like patterns of remyelination in demyelinated DCs. SC transplantation improved significantly conduction properties compared to demyelin-ated axons, but less than normal DC. Moreover, remyelinated axons by SC transplantation showed as low amplitude of CAP as dorsal roots, but lower conduction velocity than dorsal roots. Though anatomical dif-ference and/or time after transplantation influenced the conduction, these result suggested that SC mye-lination resulted in lower amplitude of CAP than OL, and SC remyelination might be insufficient for con-duction velocity.


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電子版ISSN 1882-1251 印刷版ISSN 0301-2603 医学書院

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