Delayed and bilateral changes of GAP-43/B-50 phosphorylation after circling training during a critical period in rat...

Area of Science:

• Neuroscience
• Developmental Neuroscience
• Molecular Neuroscience

Background:

• The critical period for plasticity in the rat striatum occurs between 30-37 days after birth.
• Activity-dependent plasticity plays a crucial role in shaping neural circuits during development.

Purpose of the Study:

• To investigate the effects of physiological circling behavior on the phosphorylation of Growth Associated Protein 43 (GAP-43)/B-50 in the developing rat striatum.
• To compare the temporal pattern of GAP-43/B-50 phosphorylation following asymmetrical (circling) versus symmetrical motor activity.

Main Methods:

• Inducing physiological circling behavior in rats aged 30-37 days.
• Analyzing the phosphorylation of GAP-43/B-50 in the ipsilateral and contralateral striatum post-exercise.
• Comparing phosphorylation patterns between asymmetrical circling tasks and symmetrical motor activity.

Main Results:

• Circling behavior induces delayed modifications in GAP-43/B-50 phosphorylation by Protein Kinase C (PKC).
• Both ipsilateral and contralateral striata exhibit a similar temporal phosphorylation pattern (decrease then increase) after circling.
• A lag in the initiation of the phosphorylation response is observed during asymmetrical circling, but not during symmetrical activity.

Conclusions:

• Asymmetrical motor activity, like circling, differentially impacts the timing of molecular plasticity in the developing striatum compared to symmetrical activity.
• The findings highlight the nuanced regulation of GAP-43/B-50 phosphorylation during critical developmental periods in response to specific motor behaviors.