Acetylcholine-mediated cholinergic system

The acetylcholine-mediated cholinergic system is a complex network of neurons, neurotransmitters, receptors, and enzymes responsible for essential signaling in both the central and peripheral nervous systems [1]. It utilizes the neurotransmitter acetylcholine (ACh) to modulate diverse physiological processes, including voluntary muscle movement, autonomic regulation of heart rate and digestion, and higher-order cognitive functions such as memory and attention [2]. The system is defined by two primary classes of receptors: nicotinic acetylcholine receptors (nAChRs), which are ligand-gated ion channels, and muscarinic acetylcholine receptors (mAChRs), which are G protein-coupled receptors [3]. Key enzymes include choline acetyltransferase (ChAT) for synthesis and acetylcholinesterase (AChE) for rapid degradation in the synaptic cleft [4]. Dysregulation of this system is central to the pathology of neurodegenerative conditions like Alzheimer's disease and neuromuscular disorders like myasthenia gravis [5]. Pharmacological intervention typically involves enhancing cholinergic tone through AChE inhibitors or directly modulating receptor activity to treat cognitive decline, glaucoma, or overactive bladder [1][6]. Sources: [1] StatPearls: Physiology, Cholinergic Receptors; [2] NIH: The Cholinergic System in Health and Disease; [3] IUPHAR/BPS Guide to Pharmacology: Acetylcholine receptors; [4] UniProt: Acetylcholinesterase (P22303); [5] PubMed: Cholinergic system and Alzheimer's disease; [6] PubChem: Donepezil.

Other names

Cholinergic systemAcetylcholine signaling pathwayCholinergic neurotransmission system

Drugs targeting this system act via several mechanisms: inhibition of acetylcholinesterase to increase synaptic acetylcholine levels, direct agonism or antagonism of muscarinic G protein-coupled receptors, and modulation of nicotinic ligand-gated ion channels.