Spinal cord maturation and locomotion in mice with an isolated cortex
| Autor: | Yuetong Ding, Wutian Wu, Qi Han, Libing Zhou, Yibo Qu, Meizhi Wang, Jia Feng, Kwok-Fai So |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Pyramidal Tracts
Cell Count Mice Transgenic Nerve Tissue Proteins Receptors G-Protein-Coupled Mice Nerve Fibers Microscopy Electron Transmission medicine Animals Reelin Axon Muscle Skeletal Spinal cord injury Cerebral Cortex Motor Neurons biology General Neuroscience Central pattern generator Forkhead Transcription Factors Anatomy Reticulospinal tract Spinal cord medicine.disease Disease Models Animal Reelin Protein medicine.anatomical_structure Gene Expression Regulation Spinal Cord nervous system Brain Injuries Mutation Corticospinal tract Exploratory Behavior biology.protein Psychology Neuroscience Locomotion Rubrospinal tract |
| Zdroj: | Neuroscience. 253:235-244 |
| ISSN: | 0306-4522 |
| DOI: | 10.1016/j.neuroscience.2013.08.057 |
| Popis: | The spinal cord plays a key role in motor behavior. It relays major sensory information, receives afferents from supraspinal centers and integrates movement in the central pattern generators. Spinal motor output is controlled via corticofugal pathways including corticospinal and cortico-subcortical projections. Spinal cord injury damages descending supraspinal as well as ascending sensory pathways. In adult rodent models, plasticity of the spinal cord is thought to contribute to functional recovery. How much spinal cord function depends on cortical input is not well known. Here, we address this question using Celsr3/Foxg1 mice, in which cortico-subcortical connections (including corticospinal tract (CST) and the terminal sensory pathway, the thalamocortical tract) are genetically ablated during early development. Although Celsr3/Foxg1 mice are able to eat, walk, climb on grids and swim, open-field tests showed them to be hyperactive. When compared with normal littermates, mutant animals had reduced number of spinal motor neurons, with atrophic dendritic trees. Furthermore, motor axon terminals were decreased in number, and this was confirmed by electromyography. The number of cholinergic, calbindin, and calretinin-positive interneurons was moderately increased in the mutant spinal cord, whereas that of reelin and parvalbumin-positive interneurons was unchanged. As far as we know, our study provides the first genetic evidence that the spinal motor network does not mature fully in the absence of corticofugal connections, and that some motor function is preserved despite congenital absence of the CST. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect