Heterogeneous pericoerulear neurons tune arousal and exploratory behaviours

Area of Science:

• Neuroscience
• Cell Biology

Background:

• The locus coeruleus (LC) is the brain's main source of noradrenaline, regulating arousal, stress, and avoidance.
• The precise control mechanisms of LC function by local neuromodulatory inputs are not fully understood.

Purpose of the Study:

• To identify and characterize the local neuronal populations that modulate locus coeruleus (LC) activity.
• To understand how these neurons influence arousal and avoidance behaviors.

Main Methods:

• Viral tracing to define peri-LC anatomy.
• Single-cell RNA sequencing and spatial transcriptomics for molecular cell typing.
• Neural circuit approaches in behaving mice to assess functional diversity.

Main Results:

• Identification of transcriptionally, spatially, and functionally diverse GABAergic neurons within the LC dendritic field.
• These peri-LC neurons receive distant inputs and modulate LC firing modes.
• Demonstration that LC and peri-LC neurons are heterogeneous and collectively regulate arousal and avoidance states.

Conclusions:

• Peri-LC GABAergic neurons play a critical role in modulating LC output and global arousal levels.
• The molecular and functional diversity of LC and peri-LC circuits provides insights into arousal regulation.
• This research offers a framework for understanding the neurobiology of arousal, motivation, and neuropsychiatric disorders.