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Relationship between dendritic pruning and behavioral recovery following sensorimotor cortex lesions
1Department of Psychology and Institute for Neuroscience, University of Texas at Austin, 78712, USA. d-kozlowski@nwu.edu
Behavioural Brain Research
|December 29, 1998
Summary
Following sensorimotor cortex injury, dendritic pruning normally occurs. Blocking NMDA receptors prevents pruning and deficits, but stopping the block allows recovery, suggesting pruning isn't essential for behavioral recovery.
Area of Science:
- Neuroscience
- Neuroplasticity
- Motor Cortex Research
Background:
- Unilateral sensorimotor cortex injury increases dendritic arborization in the contralateral cortex.
- This increase is followed by dendritic pruning, linked to symmetrical limb use.
- NMDA receptor antagonists prevent pruning and cause persistent behavioral deficits.
Purpose of the Study:
- To investigate if removing NMDA receptor antagonism leads to dendritic pruning and behavioral recovery.
- To determine the relationship between dendritic pruning and behavioral recovery after sensorimotor cortex injury.
Main Methods:
- Administered MK801 (NMDA receptor antagonist) to lesioned animals post-injury.
- Group 1 (Lesion + MK60) received MK801 until day 60.
- Group 2 (Lesion + MK30) received MK801 until day 30, then saline until day 60.
Main Results:
- Continuous MK801 (Lesion + MK60) prevented dendritic pruning and caused chronic deficits.
- Intermittent MK801 (Lesion + MK30) also prevented pruning but allowed behavioral recovery.
- Dendritic pruning was prevented in both MK801-treated groups.
Conclusions:
- Dendritic pruning may not be directly required for behavioral recovery after sensorimotor cortex injury.
- The timing of NMDA receptor antagonism influences both structural plasticity and functional recovery.
- Further research is needed to understand the dissociation between structural changes and behavioral outcomes.