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A Versatile Murine Model of Subcortical White Matter Stroke for the Study of Axonal Degeneration and White Matter Neurobiology
Published on: March 17, 2016
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Modified structural network backbone in the contralesional hemisphere chronically after stroke in rat brain
Michel Rt Sinke1, Willem M Otte1,2, Maurits Pa van Meer1
11 Biomedical MR Imaging and Spectroscopy Group, Center for Image Sciences, University Medical Center Utrecht, Utrecht, The Netherlands.
Summary
Stroke recovery may involve adaptive changes in the contralesional hemisphere. This study found strengthened sensorimotor network connections after stroke in rats, potentially aiding functional recovery.
Area of Science:
- Neuroscience
- Systems Neuroscience
- Neuroimaging
Background:
- Functional recovery after stroke involves complex brain network changes, including in the hemisphere not directly affected by the injury (contralesional hemisphere).
- Understanding how large-scale brain networks reorganize in the contralesional hemisphere after stroke is crucial for developing effective rehabilitation strategies.
Purpose of the Study:
- To investigate structural connectivity and network remodeling in the contralesional hemisphere following experimental stroke in rats.
- To explore the relationship between contralesional network organization and sensorimotor function after stroke.
Main Methods:
- Utilized diffusion-based tractography and graph-based network analysis to assess structural connectivity in rat brains post-stroke.
- Applied the minimum spanning tree method for unbiased characterization of network backbones.
- Compared diffusion MRI data from stroke and control groups (n=8 stroke, n=10 control).
Main Results:
- Contralesional hemisphere structural network backbones were generally stable between stroke and control groups.
- Specific sensorimotor regions in the contralesional hemisphere exhibited increased connection strength after stroke.
- Measures of global integration and efficiency in the contralesional sensorimotor network correlated with sensorimotor function.
Conclusions:
- Post-stroke, the contralesional sensorimotor network undergoes adaptive reorganization.
- This reorganization may involve the recruitment of specific sensorimotor regions through strengthened connections.
- These adaptive changes in the contralesional hemisphere could contribute to functional recovery after stroke.
