Published in:
01-05-2019 | Sleep Disorders (P Gehrman, Section Editor)
An Integrated Model of Slow-Wave Activity and Neuroplasticity Impairments in Major Depressive Disorder
Authors:
Jennifer R. Goldschmied, Philip Gehrman
Published in:
Current Psychiatry Reports
|
Issue 5/2019
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Abstract
Purpose of Review
In this review, we aim to integrate the most recent research highlighting alterations in sleep slow-wave activity (SWA), and impairments in neuroplasticity in major depressive disorder (MDD) into a novel model of disorder maintenance.
Recent Findings
Sleep homeostasis has been shown to be impaired in MDD, with a subset of individuals also demonstrating impaired SWA. SWA is considered a marker of the homeostatic regulation of sleep, and is implicated in the downscaling of synaptic strength in the context of maintaining homeostatic plasticity. Individuals with MDD have been shown to exhibit impairments in both neural plasticity such as loss of dendritic branching, and synaptic plasticity such as decreased long-term potentiation-dependent learning and memory.
Summary
Alterations in the homeostatic regulation of sleep, SWA, and synaptic plasticity in MDD suggest an underlying impairment in the modulation of synaptic strength. One candidate mechanism for this impairment is AMPA receptor trafficking.