Cholinergic Transport Mechanisms in Neurodegenerative Disorders

Cholinergic signalling, dependent on the synthesis, release and reuptake of acetylcholine, underpins cognition, attention and motor control—functions that deteriorate in neurodegenerative diseases. Key players include the high-affinity choline transporter (CHT), which recaptures extracellular choline; choline acetyltransferase (ChAT), which catalyses acetylcholine production; and the vesicular acetylcholine transporter (VAChT), which loads the neurotransmitter into synaptic vesicles. Alterations in transporter expression, subcellular localisation and trafficking contribute to synaptic failure in Alzheimer’s, Parkinson’s and other disorders. Recent advances have uncovered dynamic regulation of transporter trafficking by endosomal pathways, post-translational modifications that affect stability, and unexpected nuclear functions of ChAT in gene regulation. Transgenic models expressing primate-specific ChAT isoforms illuminate species-unique vulnerabilities, while interactions between amyloid-β oligomers and CHT highlight how pathogenic proteins disrupt presynaptic choline uptake. Therapeutic strategies are emerging to restore cholinergic tone, including small-molecule modulators of transporter function, natural-product inhibitors of acetylcholinesterase and immunotherapies that preserve transporter integrity. Integrating these insights advances our global effort to counter cholinergic decline in neurodegenerative disease.

Research from Nature Portfolio

Recent studies using a transgenic mouse that expresses the human 82-kDa isoform of ChAT in basal forebrain neurons faithfully recapitulate the age-related shift of this enzyme from the nucleus to the cytoplasm. Retention of nuclear 82-kDa ChAT in older animals correlates with preserved memory performance and reduced neuroinflammation, offering a novel in vivo system to investigate primate-specific cholinergic vulnerabilities. Complementary work reveals that acute exposure to amyloid-β oligomers drives 82-kDa ChAT to associate with chromatin and co-localise with the genome-organising protein SATB1 at matrix attachment regions. This relocalisation modulates transcription of synaptic and stress-response genes, linking cholinergic enzyme dynamics to gene regulatory networks disrupted in neurodegeneration.

Cholinergic Transport Mechanisms in Neurodegenerative Disorders publication trend

The graph below shows the total number of articles in cholinergic transport mechanisms in neurodegenerative disorders across all publications each year (not limited to Nature Index journals).

Technical terms

Acetylcholine (ACh): A neurotransmitter essential for learning, memory and neuromuscular transmission.

High-affinity choline transporter (CHT): A presynaptic membrane protein that imports choline for acetylcholine synthesis.

Choline acetyltransferase (ChAT): An enzyme that catalyses the formation of acetylcholine from choline and acetyl-CoA.

Vesicular acetylcholine transporter (VAChT): A protein that packages acetylcholine into synaptic vesicles for regulated release.

Amyloid-β (Aβ): A peptide prone to oligomerisation and aggregation, implicated in the synaptic dysfunction of Alzheimer’s disease.

References

1. Improvement of Cognitive Function by Fermented Panax ginseng C.A. Meyer Berries Extracts in an AF64A-Induced Memory Deficit Model. Nutrients (2023).
2. A novel transgenic mouse model expressing primate-specific nuclear choline acetyltransferase: insights into potential cholinergic vulnerability. Scientific Reports (2023).
3. Modulation of sodium-coupled choline transporter CHT function in health and disease. Neurochemistry International (2020).
4. Discovery of Compounds that Positively Modulate the High Affinity Choline Transporter. Frontiers in Molecular Neuroscience (2017).
5. Amino-Terminal β-Amyloid Antibody Blocks β-Amyloid-Mediated Inhibition of the High-Affinity Choline Transporter CHT. Frontiers in Molecular Neuroscience (2017).
6. 82-kDa choline acetyltransferase and SATB1 localize to β-amyloid induced matrix attachment regions. Scientific Reports (2016).