Dual Effect: The Locus Coeruleus's Function in Chronic Pain and Coexisting Depression or Anxiety

Xinyi Zhang; Man Li

doi:10.62051/46s4qg12

Authors

Xinyi Zhang
Man Li

DOI:

https://doi.org/10.62051/46s4qg12

Keywords:

Locus Coeruleus; Depression; Anxiety; Neurotransmitters; Hormone.

Abstract

The locus coeruleus (LC), nestled within the dorsal pontine tegmentum, stands as a pivotal hub in the brain's intricate network, exerting a profound influence over the modulation of pain perception and the emotional turbulences that often accompany it, notably depression and anxiety. Although a wealth of research has been dedicated to unraveling the LC's enigmatic operations, its intricate mechanisms continue to elude full comprehension. Nevertheless, the advent of sophisticated animal models and state-of-the-art investigative tools, exemplified by DREADDs (Designer Receptors Exclusively Activated by Designer Drugs) and optogenetics, has catalyzed a deeper foray into the LC's role in chronic pain and its comorbid psychiatric manifestations. This comprehensive review endeavors to dissect a decade's worth of clinical and preclinical inquiries, spotlighting the intricate neuronal dynamics within the LC and its associated neural circuit for chronic pain and its affective sequelae. Furthermore, the review delves into the pivotal role of neurotransmitters—such as noradrenaline (NA), glutamate, histamine, and others—alongside their hormonal counterparts, in orchestrating the LC's regulatory ballet. These neurochemical envoys are instrumental in mediating the nuanced interplay within the LC, thereby sculpting its reactivity to noxious stimuli. By shedding light on potential therapeutic strategies that home in on the LC, this review uncovers fertile ground for innovative therapeutic modalities, paving the way for efficacious clinical interventions that could transform the landscape of pain management and mental health treatment.

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