Serotonergic Modulation of Anxiety-Related Behaviors
Summary
Serotonin (5-hydroxytryptamine, 5-HT) exerts a pervasive influence on neural circuits governing anxiety through diverse receptor subtypes and widespread projections from the raphe nuclei. Within the amygdala, hippocampus, septum and prefrontal cortex, 5-HT release dynamically regulates the balance between excitation and inhibition, shaping both innate and learned fear responses. In the basolateral amygdala, phasic increases in 5-HT accompany acquisition and expression of conditioned fear, while tonic serotonergic tone modulates synaptic plasticity, oscillatory synchrony and spike timing. Distinct 5-HT receptor subtypes on principal cells and GABAergic interneurons confer opposing effects: activation of inhibitory 5-HT1A receptors generally dampens neuronal excitability and produces anxiolysis, whereas engagement of excitatory 5-HT2A/C receptors can facilitate aversive appraisal and heighten anxiety-like behaviours. Genetic and pharmacological manipulation of 5-HT transporters and receptors in rodents has revealed critical periods during which serotonergic signalling sculpts fear circuitry and stress resilience. Clinically, modulation of 5-HT reuptake remains a cornerstone of anxiety-disorder treatment, yet receptor-specific strategies are emerging to refine therapeutic profiles and minimise side effects. Ongoing advances in optogenetics, chemogenetics and high-resolution imaging promise to resolve subcircuit-specific actions of serotonin in real time, deepening our understanding of its role in health and in pathological anxiety.
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Serotonergic Modulation of Anxiety-Related Behaviors publication trend
The graph below shows the total number of articles in serotonergic modulation of anxiety-related behaviors across all publications each year (not limited to Nature Index journals).
Technical terms
5-HT (5-hydroxytryptamine): A monoamine neurotransmitter synthesised in brainstem raphe nuclei that modulates mood, fear, and anxiety across widespread forebrain targets.
Basolateral amygdala (BLA): A principal nucleus of the amygdaloid complex involved in processing conditioned fear and emotional memory.
GABAergic interneurons: Inhibitory neurons releasing γ-aminobutyric acid (GABA) that regulate principal-cell excitability and network synchrony.
5-HT1A receptor: A Gi/o-coupled serotonin receptor subtype that typically mediates neuronal hyperpolarisation and anxiolytic effects.
5-HT2A/C receptors: Gq-coupled serotonin receptor subtypes that enhance excitatory neurotransmission and can facilitate anxiety-related responses.
References
- Serotonin, Amygdala and Fear: Assembling the Puzzle. Frontiers in Neural Circuits (2016).
- Serotonergic innervation and serotonin receptor expression of NPY-producing neurons in the rat lateral and basolateral amygdaloid nuclei. Brain Structure and Function (2012).
- Neuronal localization of the 5-HT2 receptor family in the amygdaloid complex. Frontiers in Pharmacology (2014).
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