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Basic mechanisms of antidepressant action

In general, antidepressants function by increasing the availability of monoamines in the synapse; these monoamines are thought to be depleted in depression.

29.07.2025 Depression
image Image Diagram linking lifestyle, stress, and metabolic factors to altered brain signaling and symptoms like fatigue and anhedonia in immuno-metabolic depression.
The immune system and depression

This image explains how factors like poor health and stress lead to immuno-metabolic stress, altering brain function and triggering depressive symptoms.

29.07.2025 Depression
image Image Image showing how environmental stress influences gene expression through glucocorticoid signalling and stress-response pathways
Gene–environment interactions

This figure explains how trauma and stress trigger epigenetic changes in glucocorticoid-related gene regulation, increasing depression risk.

29.07.2025 Depression
image Image Diagram showing stress-induced activation of the HPA axis leading to cortisol release and reduced hippocampal volume, contributing to depression.
The hypothalamic–pituitary–adrenal axis

This image illustrates how chronic stress activates the HPA axis, reduces BDNF levels, and impairs hippocampal structure in depression.

29.07.2025 Depression
image Image Diagram of gut microbiota, immune signalling and neurotransmitters reaching the brain via the vagus nerve in depression.
The gut–brain axis and depression

This diagram highlights the role of gut health in depression through microbiota influence on immunity, inflammation, and neurotransmitter signaling.

29.07.2025 Depression
image Image Diagram showing how stress activates the HPA axis, leading to structural and functional brain changes and increased risk of major depressive disorder.
Stress and depression

This image details how stress-induced changes in the brain via the HPA axis contribute to depression through neuron damage and impaired plasticity.

29.07.2025 Depression

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