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Updated: Jun 27, 2025

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A Molecular Framework for Delirium.

Kyle A Lyman1

  • 1Department of Neurology, Stanford University School of Medicine, Stanford, CA, USA.

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|April 26, 2024
PubMed
Summary
This summary is machine-generated.

Delirium affects millions of older adults, causing significant mortality and healthcare costs. This review explores how the dorsolateral prefrontal cortex (dlPFC) and its molecular pathways may be key to understanding and treating delirium.

Keywords:
attentioncyclic adenosine monophosphatedeliriumdexmedetomidinedorsolateral prefrontal cortexguanfacinehyperpolarization-activated cyclic nucleotide–gated channelstetratricopeptide-repeat containing, Rab8b-interacting proteinworking memory

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Area of Science:

  • Neuroscience
  • Gerontology
  • Pharmacology

Background:

  • Delirium impacts over 2.6 million older adults annually in the US, increasing mortality and healthcare costs ($164 billion).
  • The molecular basis of delirium is poorly understood, hindering pharmacotherapy development.
  • Cognitive deficits in delirium, particularly attention and working memory (WM) impairments, localize to the dorsolateral prefrontal cortex (dlPFC).

Purpose of the Study:

  • To review the neural circuitry and molecular mechanisms of WM and dlPFC function.
  • To explore the dlPFC as a potential common endpoint for cognitive changes in delirium, especially in Alzheimer's disease (AD) patients.
  • To identify potential molecular targets for delirium treatment by understanding dlPFC function.

Main Methods:

  • Review of preclinical studies on dlPFC function and pharmacology.
  • Analysis of the role of monoaminergic and anticholinergic systems in dlPFC-mediated cognition.
  • Examination of the therapeutic potential of medications like guanfacine (α-2 agonists) in delirium.

Main Results:

  • Preclinical dlPFC models replicate delirium-related pharmacological observations (e.g., anticholinergic sensitivity, inverted-U monoaminergic response).
  • The dlPFC exhibits sensitivity to neurotransmitter levels, with optimal WM performance within a narrow signaling range.
  • α-2 agonists like guanfacine show promise for delirium treatment by modulating dlPFC activity.

Conclusions:

  • The dlPFC is a critical brain region implicated in the cognitive deficits of delirium.
  • Understanding dlPFC molecular mechanisms and circuitry may reveal new therapeutic targets for delirium.
  • Further research into α-2 agonists and dlPFC function could lead to novel pharmacotherapies for this prevalent condition.