Acetylcholine synthesis and signaling pathway (ACh pathway)

The acetylcholine synthesis and signaling pathway is a fundamental neurotransmitter system responsible for mediating communication in the central and peripheral nervous systems (StatPearls, 2023). It involves the synthesis of acetylcholine by choline acetyltransferase (ChAT), its storage in vesicles, and its release into the synaptic cleft (UniProt, 2024). Once released, acetylcholine binds to nicotinic and muscarinic receptors to trigger downstream physiological responses such as muscle contraction and cognitive processing (NCBI, 2023). The signal is rapidly terminated by the enzyme acetylcholinesterase (AChE), which hydrolyzes the neurotransmitter into choline and acetate (PubChem, 2024). Dysregulation of this pathway is a hallmark of several conditions, including Alzheimer's disease, where cholinergic neurons are lost, and myasthenia gravis, where receptor function is impaired (PubMed, 2022). Pharmacological agents often target this pathway by inhibiting AChE to prolong acetylcholine activity or by directly modulating receptor subtypes to treat various neurological and autonomic disorders (StatPearls, 2023).

Other names

Cholinergic systemCholinergic signaling pathwayACh signaling

Drugs targeting this pathway primarily function by inhibiting the acetylcholinesterase enzyme to increase the concentration and duration of acetylcholine in the synapse, or by acting as agonists or antagonists at muscarinic and nicotinic receptors to modulate signal transduction (StatPearls, 2023; PubChem, 2024).