Journal article
Regeneration of adult dorsal root axons into transplants of embryonic spinal cord
Journal of comparative neurology (1911), v 270(4), pp 537-548
22 Apr 1988
PMID: 3259590
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Transplants of the embryonic rat spinal cord survive and differentiate in the spinal cords of adult and newborn host rats. Very little is known about the extent to which these homotopic transplants can provide an environment for regeneration of adult host axons that normally terminate in the spinal cord. We have used horseradish peroxidase injury filling and transganglionic transport methods to determine whether transected dorsal roots regenerate into fetal spinal cord tissue grafted into the spinal cords of adult rats. Additional transplants were examined for the presence of calcitonin gene-related peptide-like immunoreactivity, which in the normal dorsal horn is derived exclusively from primary afferent axons. Host animals had one side of the L4-5 spinal cord resected and replaced by a transplant of E14 or E15 spinal cord. Adjacent dorsal roots were sectioned and juxtaposed to the graft. The dorsal roots and their projections into the transplants were then labeled 2-9 months later. The tracing methods that used transport or diffusion of horseradish peroxidase demonstrated that severed host dorsal root axons had regenerated and grown into the transplants. In addition, some donor and host neurons had extended their axons into the periphery to at least the midthigh level as indicated by retrograde labeling following application of tracer to the sciatic nerve. Primary afferent axons immunoreactive for calcitonin gene-related peptide were among those that regenerated into transplants, and the projections shown by this immunocytochemical method exceeded those demonstrated by the horseradish peroxidase tracing techniques. Growth of the host dorsal roots into transplants indicates that fetal spinal cord tissue permits regeneration of adult axotomized neurons that would otherwise be aborted at the dorsal root/spinal cord junction. This transplantation model should therefore prove useful in studying the enhancement and specificity of the regrowth of axons that normally terminate in the spinal cord.
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Details
- Title
- Regeneration of adult dorsal root axons into transplants of embryonic spinal cord
- Creators
- A Tessler - Drexel University, Medical College of Pennsylvania (1970-1993)B T Himes - Drexel University, Medical College of Pennsylvania (1970-1993)J Houle - University of Arkansas at Little RockP J Reier - University of Florida
- Publication Details
- Journal of comparative neurology (1911), v 270(4), pp 537-548
- Publisher
- Wiley; United States
- Number of pages
- 12
- Grant note
- NS 22316 / NINDS NIH HHS NS 24707 / NINDS NIH HHS
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Neurobiology and Anatomy
- Web of Science ID
- WOS:A1988M985500006
- Scopus ID
- 2-s2.0-0023917675
- Other Identifier
- 991014878002904721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Neurosciences
- Zoology