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Cerebellar D1DR-expressing neurons modulate the frontal cortex during timing tasks.
Jonah Heskje1, Kelsey Heslin2, Benjamin J De Corte2
1Department of Psychiatry, University of Iowa, Iowa City, IA 52242, United States.
Neurobiology of Learning and Memory
|August 13, 2019
Summary
Blocking dopamine D1 receptors in the lateral cerebellar nuclei (LCN) impaired interval timing in rats. This manipulation also reduced ramping activity in medial frontal cortex (MFC) neurons, suggesting a role for LCN dopamine in cognitive functions.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Dopamine Receptor Research
Background:
- The cerebellum is increasingly recognized for its role in cognitive functions, interacting with association cortices like the medial frontal cortex (MFC).
- The precise mechanisms by which the cerebellum influences the frontal cortex and the nature of information exchange remain unclear.
- Dopamine D1 receptors (D1DRs) expressed in lateral cerebellar nuclei (LCN) neurons are implicated in cognitive processes.
Purpose of the Study:
- To investigate the impact of blocking LCN D1DRs on interval timing performance in rats.
- To examine how LCN D1DR blockade affects neuronal activity, specifically ramping activity, in the contralateral MFC.
- To elucidate the role of LCN catecholamines in driving MFC neuronal dynamics and influencing cognitive function.
Main Methods:
- Pharmacological blockade of right LCN D1DRs using the D1DR antagonist SCH23390 in male rats.
- Assessment of interval timing performance using a lever-pressing task for water reward.
- Recording of single-unit activity in the contralateral (left) MFC to analyze neuronal firing patterns, including ramping activity.
Main Results:
- Blocking LCN D1DRs led to impairments in specific measures of interval timing performance.
- A significant attenuation of ramping activity in MFC single units was observed following LCN D1DR blockade.
- These findings suggest that catecholaminergic signaling in the LCN influences MFC neuronal dynamics.
Conclusions:
- Dopamine D1 receptors in the LCN play a crucial role in interval timing, a cognitive function reliant on the MFC.
- LCN catecholamines modulate MFC neuronal activity patterns, contributing to cognitive processes.
- This study provides novel insights into the cerebellar contribution to cognitive functions via dopaminergic pathways influencing frontal cortex activity.
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