Transgenic labeling of the corticospinal tract for monitoring axonal responses to spinal cord injury

Florence M. Bareyre, Martin Kerschensteiner, Thomas Misgeld, Joshua R. Sanes

Research output: Contribution to journalArticlepeer-review

168 Scopus citations

Abstract

The rodent corticospinal tract (CST) has been used extensively to investigate regeneration and remodeling of central axons after injury. CST axons are currently visualized after injection of tracer dye, which is invasive, incomplete and prone to variation, and often does not show functionally crucial but numerically minor tract components. Here, we characterize transgenic mice in which CST fibers are specifically and completely labeled by yellow fluorescent protein (YFP). Using these CST-YFP mice, we show that minor CST components are responsible for most monosynaptic contacts onto motoneurons. Lesions of the main dorsal CST lead to extension of new collaterals, some of them originating from large, heavily myelinated axons within the minor dorsolateral and ventral CST components. Some of these new collaterals form additional direct synapses onto motoneurons. We propose that CST-YFP mice will be useful for evaluating strategies designed to maximize such remodeling and to promote regeneration.

Original languageEnglish
Pages (from-to)1355-1360
Number of pages6
JournalNature Medicine
Volume11
Issue number12
DOIs
StatePublished - Dec 2005
Externally publishedYes

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