Acetylcholine metabolism (ACh metabolism)

Acetylcholine metabolism refers to the coordinated biological processes governing the synthesis, storage, release, and termination of the neurotransmitter acetylcholine (ACh) (StatPearls, 2023). It involves key proteins such as choline acetyltransferase (ChAT) for synthesis, the vesicular acetylcholine transporter (VAChT) for storage, and acetylcholinesterase (AChE) for rapid degradation in the synaptic cleft (NCBI, 2022). This metabolic cycle is crucial for maintaining proper signaling in the central nervous system, autonomic ganglia, and neuromuscular junctions (UniProt, 2024). Impairment of acetylcholine metabolism is a hallmark of neurodegenerative conditions like Alzheimer's disease and neuromuscular disorders like myasthenia gravis (PubMed, 2021). Therapeutic strategies often involve the use of acetylcholinesterase inhibitors to compensate for cholinergic deficits by slowing the breakdown of ACh (NIH, 2023). However, overstimulation of this pathway can lead to toxic effects, such as those seen in organophosphate poisoning, resulting in a life-threatening cholinergic crisis (StatPearls, 2023).

Other names

Cholinergic metabolismAcetylcholine synthesis and degradationACh turnoverCholinergic pathway

Drugs targeting acetylcholine metabolism primarily act by inhibiting the enzyme acetylcholinesterase (AChE), which prevents the hydrolysis of acetylcholine and increases its availability at the synapse (StatPearls, 2023). Other agents may inhibit the vesicular acetylcholine transporter (VAChT) to prevent storage or the high-affinity choline transporter (ChT) to block reuptake (NCBI, 2022).