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Cholinergic system dysfunction and neurodegenerative diseases: cause or effect?

Ada M Tata, Lucia Velluto, Chiara D'Angelo

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Acetylcholine (ACh), a key neurotransmitter, plays vital roles in nervous system development and function. Dysregulation of ACh signaling is linked to neurodegenerative diseases, psychiatric disorders, and inflammation, suggesting new therapeutic targets.

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Area of Science:

  • Neuroscience
  • Neurochemistry
  • Pathology

Background:

  • Acetylcholine (ACh) was the first identified neurotransmitter, with well-documented roles in the central and peripheral nervous systems.
  • ACh influences embryonic development, including cell proliferation and neuronal survival, and has functions beyond the nervous system in adults.
  • Emerging evidence links altered ACh levels or receptor function to neurodegenerative diseases (Alzheimer's, Parkinson's, Huntington's), psychiatric disorders (schizophrenia), and inflammatory conditions (multiple sclerosis).

Purpose of the Study:

  • To explore the cause-and-effect relationships underlying cholinergic dysfunction in various nervous system disorders.
  • To review the proposed new physiological roles of ACh in neuronal and non-neuronal tissues.
  • To discuss potential novel therapeutic strategies for cholinergic dysfunction.

Main Methods:

  • Literature review focusing on the role of acetylcholine in health and disease.
  • Analysis of studies investigating cholinergic circuit dysfunction in neurological and psychiatric conditions.
  • Examination of research on ACh's involvement in inflammation and its impact on disease outcomes.

Main Results:

  • Cholinergic circuit dysfunction is frequently correlated with cognitive, behavioral, and motor deficits in neurodegenerative and psychiatric diseases.
  • Altered ACh function may represent an additional pathogenetic mechanism in diseases like multiple sclerosis, modulating inflammation.
  • The review identifies potential cause-and-effect links between cholinergic system alterations and disease pathologies.

Conclusions:

  • Understanding cholinergic dysfunction is crucial for elucidating the pathogenesis of numerous nervous system disorders.
  • Novel therapeutic approaches targeting the cholinergic system, including cholinesterase inhibitors and receptor modulators, show promise.
  • Further research into ACh's role in inflammation and disease could unveil new treatment avenues.