Antidepressant Mechanisms in Animal Models
Summary
The mechanistic investigation of antidepressant actions in animal models has elucidated diverse biological pathways that underpin mood regulation and therapeutic efficacy. Preclinical studies routinely employ rodent paradigms—including chronic unpredictable stress, corticosterone administration and behavioural assays such as the forced swim and tail suspension tests—to probe the effects of pharmacological agents, botanical extracts and genetic interventions. Monoaminergic modulation remains a foundational theme, with research emphasising the restoration of serotonergic, noradrenergic and dopaminergic tone. Parallel work has highlighted the role of neurotrophic factors such as brain-derived neurotrophic factor (BDNF) in synaptic plasticity and neurogenesis, particularly within the hippocampus. The hypothalamic–pituitary–adrenal (HPA) axis emerges as a critical interface between stress and mood, with antidepressant interventions often normalising dysregulated corticosterone levels. Further mechanistic layers include anti-inflammatory actions, the regulation of intracellular signalling cascades (for example PI3K–AKT and ERK/MAPK pathways) and the modulation of the gut–brain axis via microbial communities. These convergent pathways not only advance our understanding of depression pathophysiology but also inform the development of novel therapeutic strategies with translational potential.
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Antidepressant Mechanisms in Animal Models publication trend
The graph below shows the total number of articles in antidepressant mechanisms in animal models across all publications each year (not limited to Nature Index journals).
Technical terms
Chronic unpredictable stress (CUS): A rodent paradigm involving varied stressors over time to induce depression-like behaviours.
PI3K–AKT pathway: An intracellular signalling cascade regulating cell survival, neuroplasticity and response to antidepressant treatments.
Hypothalamic–pituitary–adrenal (HPA) axis: A neuroendocrine system controlling the stress response and glucocorticoid release.
Neuroinflammation: Activation of central immune cells and cytokine production that can influence mood and synaptic function.
Gut–brain axis: Bidirectional communication between gut microbiota and the central nervous system impacting emotional regulation.
References
- Cuscutae semen alleviates CUS-induced depression-like behaviors in mice via the gut microbiota-neuroinflammation axis. Frontiers in Pharmacology (2023).
- PI3K–AKT Signaling Activation and Icariin: The Potential Effects on the Perimenopausal Depression-Like Rat Model. Molecules (2019).
- Vaccinium bracteatum Leaf Extract Reverses Chronic Restraint Stress-Induced Depression-Like Behavior in Mice: Regulation of Hypothalamic-Pituitary-Adrenal Axis, Serotonin Turnover Systems, and ERK/Akt Phosphorylation. Frontiers in Pharmacology (2018).
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