Dopamine Neurotransmission Dynamics in Major Depressive Disorder

Major depressive disorder (MDD) is increasingly recognised as a condition in which dysregulation of dopamine signalling contributes to core symptoms of anhedonia, psychomotor slowing and motivational deficits. At the synaptic level, both tonic (baseline) and phasic (burst-like) dopamine release in the striatum influence reward processing and goal-directed behaviour. In MDD, studies point to reduced synthesis capacity, altered receptor availability and impaired reuptake, collectively lowering dopaminergic tone. These molecular changes disrupt cortico-striatal circuits that underlie motivational salience and cognitive flexibility. Advances in multimodal imaging and computational analysis have refined our view of how altered dopamine transporter function and receptor binding potential shape network interactions, particularly between the ventral striatum and prefrontal cortex. Integrating genetic, metabolic and immunological factors further reveals how systemic inflammation and metabolic stress can attenuate dopamine dynamics. Understanding these pathways is vital for developing biomarkers of disease severity and for tailoring dopaminergic agents or neuromodulation therapies to restore circuit function and improve clinical outcomes worldwide.

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Dopamine Neurotransmission Dynamics in Major Depressive Disorder publication trend

The graph below shows the total number of articles in dopamine neurotransmission dynamics in major depressive disorder across all publications each year (not limited to Nature Index journals).

Technical terms

Dopamine transporter (DAT): A membrane protein that clears dopamine from the synapse, regulating extracellular dopamine levels.

D2/3 receptor: Subtypes of postsynaptic dopamine receptors involved in modulating reward and motivational circuits.

Binding potential (BPND): An imaging metric reflecting the density of available receptors or transporters for ligand binding in vivo.

Texture analysis: A computational technique to quantify spatial patterns and heterogeneity within medical images, revealing subtle changes in tracer distribution.

References

1. Towards a multilevel model of major depression: genes, immuno-metabolic function, and cortico-striatal signaling. Translational Psychiatry (2023).
2. Dopamine in major depressive disorder: A systematic review and meta-analysis of in vivo imaging studies. Journal of Psychopharmacology (2023).
3. Dopamine dysfunction in depression: application of texture analysis to dopamine transporter single-photon emission computed tomography imaging. Translational Psychiatry (2022).