Abstract
Anatomical plasticity and functional recovery after lesions of the rodent corticospinal tract (CST) decrease postnatally in parallel with myelin formation. Myelin-associated neurite growth inhibitory proteins prevent regenerative fiber growth, but whether they also prevent reactive sprouting of unlesioned fibers is less clear. Here we show that after unilateral CST lesion in the adult rat brainstem, both intact and lesioned tracts show topographically appropriate sprouting after treatment with a monoclonal antibody that neutralizes these inhibitory proteins. Antibody-treated animals showed full recovery in motor and sensory tests, whereas untreated lesioned rats exhibited persistent severe deficits. Neutralization of myelin-associated neurite growth inhibitors thus restores in adults the structural plasticity and functional recovery normally found only at perinatal ages.
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Acknowledgements
We thank Regula Schneider, Ruedi Kägi and Martina Weber for technical assistance. Roland Schoeb helped with photography and Eva Hochreutener with the graphics. This work was supported by the Swiss National Science Foundation, the International Research Institute of Paraplegia (Zürich) and the American Paralysis Association (Springfield, New Jersey).
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Thallmair, M., Metz, G., Z'Graggen, W. et al. Neurite growth inhibitors restrict plasticity and functional recovery following corticospinal tract lesions. Nat Neurosci 1, 124–131 (1998). https://doi.org/10.1038/373
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DOI: https://doi.org/10.1038/373