Antidepressant Mechanisms and Neurochemical Interventions in Mice

Preclinical research in mice has been instrumental for elucidating the biological underpinnings of antidepressant action. Traditional approaches have focused on modulation of monoaminergic neurotransmission, notably serotonergic, noradrenergic and dopaminergic pathways, through inhibition of reuptake transporters or enzymatic degradation. More recent paradigms extend beyond classical monoamines to encompass neurotrophic support, hypothalamic–pituitary–adrenal (HPA) axis regulation, and glutamatergic synaptic plasticity. Changes in brain-derived neurotrophic factor (BDNF) signalling within the hippocampus and prefrontal cortex have emerged as key drivers of synaptic remodelling associated with sustained mood improvement.

Alongside these well-characterised mechanisms, mounting evidence highlights the roles of neuroinflammation and oxidative stress in the pathogenesis of depressive-like states. Organoselenium compounds, natural extracts and novel small molecules have been tested in established behavioural paradigms to assess efficacy and dissect underlying pathways. Forced Swim and Tail Suspension tests remain standard for phenotypic screening, while assays of cytokine levels, antioxidant enzyme activity and neurotrophin expression provide mechanistic insight. Together, these approaches are refining our understanding of how antidepressant interventions restore neural homeostasis and offer routes to next-generation therapies.

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Antidepressant Mechanisms and Neurochemical Interventions in Mice publication trend

The graph below shows the total number of articles in antidepressant mechanisms and neurochemical interventions in mice across all publications each year (not limited to Nature Index journals).

Technical terms

Forced Swim Test (FST): A behavioural assay in which mice placed in water exhibit mobility changes reflecting behavioural despair and antidepressant efficacy.

Tail Suspension Test (TST): A behavioural paradigm where immobility time during suspension by the tail serves as a measure of depressive-like state and pharmacological response.

Neuroinflammation: Activation of central immune responses, including microglial cytokine release, implicated in mood disorders and targeted by anti-inflammatory interventions.

Oxidative Stress: Imbalance between reactive oxygen species production and antioxidant defence, leading to neuronal damage and associated with depressive-like phenotypes.

Brain-Derived Neurotrophic Factor (BDNF): A neurotrophin critical for synaptic plasticity and neuronal survival, often reduced in depressive states and restored by effective antidepressant treatments.

Monoaminergic System: Neurotransmitter networks involving serotonin, norepinephrine and dopamine, historically central to antidepressant pharmacology.

References

1. Selanylimidazopyridine Prevents Lipopolysaccharide-Induced Depressive-Like Behavior in Mice by Targeting Neurotrophins and Inflammatory/Oxidative Mediators. Frontiers in Neuroscience (2018).
2. Synergistic Action of Sodium Selenite with some Antidepressants and Diazepam in Mice. Pharmaceutics (2018).
3. Short- and Long-Term Repeated Forced Swim Stress Induce Depressive-Like Phenotype in Mice: Effectiveness of 3-[(4-Chlorophenyl)Selanyl]-1-Methyl-1H-Indole. Frontiers in Behavioral Neuroscience (2020).