Nematode levamisole-sensitive nicotinic acetylcholine receptor 1 (L-AChR1)

The Nematode levamisole-sensitive nicotinic acetylcholine receptor 1 (L-AChR1) is a heteropentameric, ligand-gated ion channel essential for neuromuscular coordination in parasitic nematodes (Boulin et al., 2011). It belongs to the Cys-loop superfamily of receptors and is typically composed of subunits such as UNC-38, UNC-63, UNC-29, and ACR-8, though the exact composition can vary between species (Boulin et al., 2011; Williamson et al., 2009). Located at the neuromuscular junction, L-AChR1 mediates excitatory signals from motor neurons to body wall muscles; its activation by acetylcholine triggers cation influx, leading to muscle depolarization and contraction (MSD Veterinary Manual). This receptor is a primary target for several classes of anthelmintic drugs, including imidazothiazoles like levamisole and tetrahydropyrimidines like pyrantel, which act as potent agonists (Boulin et al., 2011; Martin et al., 2004). These drugs cause prolonged channel opening, leading to persistent depolarization and spastic paralysis, which results in the parasite's detachment and expulsion from the host (MSD Veterinary Manual). However, the widespread use of these anthelmintics has led to the emergence of resistance, often characterized by genetic polymorphisms or altered expression of the receptor's constituent subunits (Neveu et al., 2010).

Other names

Levamisole-sensitive nicotinic acetylcholine receptorL-type nicotinic acetylcholine receptorHco-L-AChR1Levamisole receptor

Agonists (e.g., levamisole, pyrantel) induce persistent opening of the ligand-gated ion channel, leading to muscle depolarization, calcium influx, and spastic paralysis (Boulin et al., 2011; MSD Veterinary Manual). Antagonists (e.g., derquantel) block the receptor, preventing activation and leading to flaccid paralysis (Robertson et al., 2002).