Nematode glutamate-gated chloride channel (GluCl) (GluCl)

The nematode glutamate-gated chloride channel (GluCl) is a member of the Cys-loop family of ligand-gated ion channels, found exclusively in invertebrates such as nematodes and arthropods [1]. These channels mediate fast inhibitory neurotransmission by allowing the influx of chloride ions upon activation by L-glutamate, leading to membrane hyperpolarization [2]. GluCls play critical roles in regulating nematode locomotion, feeding through pharyngeal pumping, and sensory input processing [3]. They are the primary molecular targets for the avermectin and milbemycin classes of anthelmintic drugs, most notably ivermectin [4]. By binding to the transmembrane domain of the channel, these drugs act as potent agonists or allosteric activators, causing prolonged channel opening [1, 2]. This persistent activation results in flaccid paralysis and eventual death of the parasite [1]. Because GluCls are absent in vertebrates, they provide a high margin of therapeutic safety for the host [4]. However, at high concentrations, these drugs can potentially interact with vertebrate GABA or glycine receptors [2]. Resistance to these drugs is an emerging concern, often linked to mutations in the GluCl subunits [1]. Understanding the structure and function of GluCl remains vital for developing new antiparasitic agents [2].

Other names

Glutamate-gated chloride channelGluCl receptorAvermectin-sensitive glutamate-gated chloride channelH-receptor

Drugs targeting this channel act as potent allosteric agonists or activators that bind to the transmembrane domain, stabilizing the open state of the channel and causing a persistent influx of chloride ions, which leads to hyperpolarization and flaccid paralysis of the parasite [1, 2, 4].