Neurobiological Mechanisms of Electroconvulsive Therapy

Electroconvulsive therapy (ECT) remains one of the most efficacious interventions for severe and treatment-resistant mood disorders, yet its precise neurobiological substrates continue to be elucidated. At a cellular level, seizure induction triggers a cascade of synaptic remodelling, characterised by up-regulation of neurotrophic factors such as brain-derived neurotrophic factor (BDNF) and vascular endothelial growth factor, which in turn promote hippocampal neurogenesis and dendritic spine growth. Concurrently, ECT modulates monoaminergic and GABAergic neurotransmission, restoring balance in circuits implicated in affect regulation. On a network scale, functional imaging studies reveal normalisation of hyperactive limbic structures and enhancement of prefrontal control over subcortical regions. Emerging evidence also implicates transient activation of innate immune pathways and glial cells, whereby a short-lived inflammatory response may act as a catalyst for long-term plastic changes. These interlinked processes contribute to the rapid amelioration of depressive symptoms and cognitive restoration in many patients. Ongoing research strives to refine stimulation parameters to maximise therapeutic gain while minimising adverse effects such as memory disturbance, underscoring the global significance of optimising ECT protocols for clinical practice.

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Technical terms

Neuroplasticity: The capacity of the brain to reorganise synaptic connections in response to experience, injury or therapeutic intervention.

Neurotrophins: A family of proteins, including brain-derived neurotrophic factor, that support neuronal survival, growth and synaptic plasticity.

Microglia: Innate immune cells of the central nervous system that mediate inflammatory responses and sculpt synaptic networks.

Cytokines: Small proteins secreted by immune cells that regulate inflammation and can influence neuronal function.

Hippocampal neurogenesis: The generation of new neurons in the dentate gyrus of the hippocampus, implicated in mood regulation and cognitive processes.

Hypothalamic–pituitary–adrenal axis: A neuroendocrine system that controls stress responses through hormonal signalling between the brain and peripheral glands.

References

1. Peripheral blood inflammatory markers in depression: Response to electroconvulsive therapy and relationship with cognitive performance. Psychiatry Research (2022).
2. Electroconvulsive stimulation attenuates chronic neuroinflammation. JCI Insight (2020).
3. Immune and neurotrophin stimulation by electroconvulsive therapy: is some inflammation needed after all?. Translational Psychiatry (2015).