Dopaminergic Mechanisms in Adolescent Neural Development

Adolescence is marked by profound remodelling of dopaminergic circuits that underlie reward processing, decision making and cognitive flexibility. During this period, mesocorticolimbic dopamine pathways undergo protracted maturation: mesolimbic projections to the nucleus accumbens refine early in adolescence, whereas mesocortical axons continue to extend into the prefrontal cortex until early adulthood. This staggered growth is orchestrated by guidance cues, receptor expression dynamics and synaptic pruning. Key molecular players include the netrin-1 ligand and its receptor DCC, which direct axonal targeting and branching, and dopamine transporters that regulate extracellular dopamine availability. Fluctuations in receptor subtypes and transporter levels confer heightened plasticity but also vulnerability to environmental perturbations such as stress or psychostimulant exposure. Sex-specific differences in guidance-cue signalling further diversify trajectories of circuit assembly, underpinning distinct patterns of risk or resilience for later psychopathology. Together, these processes sculpt neural networks that support mature behavioural repertoires yet leave a window for lasting influence by internal and external factors.

Research from Nature Portfolio

Recent studies have demonstrated that adolescent exposure to amphetamine disrupts the balance of netrin-1/DCC signalling in a sex- and age-dependent manner. In early adolescent males, amphetamine interferes with DCC-mediated guidance, inducing ectopic growth of mesolimbic dopamine axons into the prefrontal cortex and resulting in enduring cognitive deficits. By contrast, females exhibit compensatory upregulation of netrin-1 that preserves normal dopamine connectivity and protects against such deficits. This work identifies netrin-1/DCC as a molecular switch that can be differentially regulated by the same drug experience to yield divergent circuit outcomes and long-term behavioural phenotypes.

Dopaminergic Mechanisms in Adolescent Neural Development publication trend

The graph below shows the total number of articles in dopaminergic mechanisms in adolescent neural development across all publications each year (not limited to Nature Index journals).

Technical terms

Dopamine transporter (DAT): Membrane protein that clears extracellular dopamine by reuptake into presynaptic neurons, regulating synaptic dopamine levels and plasticity.

Mesocortical pathway: Dopaminergic projection from the ventral tegmental area to the prefrontal cortex, critical for executive function and cognitive flexibility.

Mesolimbic pathway: Dopaminergic projection from the ventral tegmental area to limbic regions such as the nucleus accumbens, central to reward processing and motivation.

Netrin-1: Secreted guidance cue that directs axonal growth and target recognition through interactions with its receptors.

DCC receptor: Deleted in Colorectal Cancer receptor; a netrin-1 binding protein that mediates attractive guidance cues for developing axons.

References

1. Amphetamine disrupts dopamine axon growth in adolescence by a sex-specific mechanism in mice. Nature Communications (2023).
2. Dopamine transporter blockade during adolescence increases adult dopamine function, impulsivity, and aggression. Molecular Psychiatry (2023).
3. The Netrin Receptor DCC Is Required in the Pubertal Organization of Mesocortical Dopamine Circuitry. Journal of Neuroscience (2011).
4. Mesocorticolimbic Dopamine Pathways Across Adolescence: Diversity in Development. Frontiers in Neural Circuits (2021).
5. Dopamine Axon Targeting in the Nucleus Accumbens in Adolescence Requires Netrin-1. Frontiers in Cell and Developmental Biology (2020).