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Ipsilateral versus contralateral spontaneous post-stroke neuroplastic changes: involvement of BDNF?
A Madinier1, N Bertrand, M Rodier
1Unité INSERM U1093 Cognition, Action et Plasticité Sensorimotrice, Dijon F-21078, France.
Neuroscience
|December 11, 2012
Summary
Stroke recovery involves brain plasticity, with brain-derived neurotrophic factor (BDNF) playing a key role. This study reveals BDNF
Area of Science:
- Neuroscience
- Neurobiology
- Stroke Research
Background:
- Stroke is a major cause of long-term disability, with limited understanding of spontaneous recovery mechanisms.
- Brain-derived neurotrophic factor (BDNF) is crucial for neuroplasticity, but its role in stroke recovery is not fully elucidated.
- Existing research often overlooks the distinct roles of pro- and mature BDNF forms and their regional expression post-stroke.
Purpose of the Study:
- To investigate the long-term expression of both pro- and mature BDNF forms in rat brain hemispheres after ischemic stroke.
- To examine BDNF expression in the cortex and hippocampus, regions vital for functional recovery.
- To correlate BDNF expression patterns with synaptophysin, a marker of synaptogenesis, to understand plasticity mechanisms.
Main Methods:
- Photothrombotic ischemia was induced in rats to model stroke.
- Expression levels of pro-BDNF and mature BDNF were measured over one month post-stroke.
- Synaptophysin expression was assessed as a marker for synapse formation.
- Analyses were conducted in both hemispheres, cortex, and hippocampus.
Main Results:
- Stroke caused a rapid, transient increase in mature BDNF in the cortex, followed by delayed synaptophysin increase ipsilaterally.
- Hippocampal mature BDNF showed a delayed increase, coinciding with synaptophysin changes.
- Pro-BDNF levels varied differently between hemispheres in the hippocampus, suggesting differential gene regulation.
- BDNF expression patterns and their relation to synaptogenesis differed between brain regions.
Conclusions:
- BDNF metabolism undergoes complex changes following stroke.
- Mature BDNF expression in the cortex is early and transient, linked to later synaptogenesis.
- Hippocampal BDNF changes are delayed and region-specific, indicating complex involvement in spontaneous recovery.
- The study suggests BDNF's role in post-stroke plasticity is region-dependent.
