Insect nicotinic acetylcholine receptor (nAChR)

The insect nicotinic acetylcholine receptor (nAChR) is a pentameric ligand-gated ion channel predominantly expressed in the central nervous system of insects[4][5]. These receptors are composed of diverse combinations of α and β subunits, forming distinct subtypes with specific pharmacological profiles[1][2][5]. nAChRs facilitate rapid neurotransmission by opening a cation channel upon binding acetylcholine, leading to neuronal depolarization. They are the direct molecular targets of several major classes of insecticides, most notably neonicotinoids, which selectively bind and activate these receptors, resulting in hyperexcitation, paralysis, and death of target pests[3][4][6]. Other insecticides, such as spinosyns and sulfoximines, also act through these channels by agonism or allosteric modulation[6]. nAChRs are essential for insect neural signaling and behaviors including locomotion, escape responses, and circadian rhythm[9]. They are not directly implicated in human disease but play a critical role in pest/vector control applications. The evolution of resistance mutations, particularly in subunits like β1, and non-target effects on beneficial insects and the environment, constitute major safety and therapeutic challenges[6][9].

Other names

insect nAChRinsect nicotinic receptornicotinic acetylcholine receptor (insect)insect neuronal nAChR

Selective agonism (activation by neonicotinoids and nicotine-like compounds) - Allosteric modulation (spinosyns) - Channel opening (causes neuronal depolarization and paralysis) - Blockade/inhibition by peptide toxins (α-bungarotoxin, ω-Hexatoxin-Hv1a)