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Dopaminergic receptor blockade changes a functional connectivity network centred on the amygdala
Jan Haaker1,2, Mareike M Menz3, Tahmine Fadai3
1Department of Systems Neuroscience, University Medical Center Hamburg-Eppendorf, Hamburg, Germany. jan.haaker@ki.se.
Human Brain Mapping
|July 15, 2016
Summary
Dopamine D2-receptor blockade significantly alters brain connectivity, particularly between the amygdala and cortical areas. This research sheds light on functional brain changes in psychiatric conditions.
Area of Science:
- Neuroimaging
- Neuropharmacology
- Systems Neuroscience
Background:
- Resting-state connectivity is crucial for understanding brain function in neuropsychiatric disorders.
- Neuromodulator systems significantly influence brain circuit integrity.
- Investigating the dopaminergic system's impact on connectivity is vital.
Purpose of the Study:
- To examine the effects of D2-receptor blockade on whole-brain functional connectivity.
- To assess how haloperidol influences resting-state functional magnetic resonance imaging (fMRI) signals.
- To correlate dopaminergic system function with brain network alterations.
Main Methods:
- Functional magnetic resonance imaging (fMRI) in 20 healthy subjects.
- Pharmacological challenge using a D2-receptor antagonist (haloperidol) versus placebo.
- Network-based statistics and pairwise connectivity analyses.
Main Results:
- Haloperidol administration profoundly altered functional integration linked to the amygdala.
- Reduced connectivity and link strength were observed between the amygdala and posterior cingulate cortex/cortical areas.
- Enhanced connectivity was noted between the amygdala and the right putamen.
Conclusions:
- Pharmacologically induced changes in resting-state connectivity may mirror alterations in dopaminergic dysfunction.
- Findings may help interpret brain connectivity shifts in psychiatric conditions and their treatments.
- This study provides insights into the role of the dopaminergic system in large-scale brain networks.
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