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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Nicholls, J. G. Varga, Z. M. Schwab, M. E. |
| Description | Author Affiliation: Varga ZM ( Department of Pharmacology, Biozentrum, University of Basel, Switzerland.); |
| Abstract | Neurite outgrowth across spinal cord lesions in vitro is rapid in preparations isolated from the neonatal opossum Monodelphis domestica up to the age of 12 days. At this age oligodendrocytes, myelin, and astrocytes develop and regeneration ceases to occur. The role of myelin-associated neurite growth-inhibitory proteins, which increase in concentration at 10-13 days, was investigated in culture by applying the antibody IN-1, which blocks their effects. In the presence of IN-1, 22 out of 39 preparations from animals aged 13-17 days showed clear outgrowth of processes into crushes. When 34 preparations from 13-day-old animals were crushed and cultured without antibody, no axons grew into the lesion. The success rate with IN-1 was comparable to that seen in younger animals but the outgrowth was less profuse. IN-1 was shown by immunocytochemistry to penetrate the spinal cord. Other antibodies which penetrated the 13-day cord failed to promote fiber outgrowth. To distinguish between regeneration by cut neurites and outgrowth by developing uncut neurites, fibers in the ventral fasciculus were prelabeled with carbocyanine dyes and subsequently injured. The presence of labeled fibers in the lesion indicated that IN-1 promoted regeneration. These results show that the development of myelin-associated growth-inhibitory proteins contributes to the loss of regeneration as the mammalian central nervous system matures. The definition of a critical period for regeneration, coupled with the ability to apply trophic as well as inhibitory molecules to the culture, can permit quantitative assessment of molecular interactions that promote spinal cord regeneration. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 24 |
| Volume Number | 92 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1995-12-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Growth Inhibitors Physiology Membrane Proteins Myelin Proteins Myelin Sheath Nerve Regeneration Nerve Tissue Proteins Neurites Ultrastructure Spinal Cord Animals Axons Cells, Cultured Immunologic Techniques Nerve Crush Opossums Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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