Pediculus humanus capitis neuronal ligand-gated ion channels (LGICs)

Pediculus humanus capitis neuronal ligand-gated ion channels (LGICs) are a superfamily of transmembrane proteins that mediate fast synaptic transmission in the head louse nervous system [4]. This group includes nicotinic acetylcholine receptors (nAChRs), gamma-aminobutyric acid (GABA) receptors, and glutamate-gated chloride channels (GluCls), which are essential for the insect's motor control, sensory processing, and survival [4]. Because GluCls are unique to invertebrates and insect nAChRs possess distinct pharmacological profiles compared to mammalian versions, these channels are primary targets for selective pediculicides [1]. For example, ivermectin acts as a positive allosteric modulator of GluCls, causing an influx of chloride ions that leads to hyperpolarization and flaccid paralysis of the louse [1]. Spinosad, another common treatment, targets nAChRs to induce continuous activation, resulting in tremors and eventual death from neuromuscular exhaustion [2]. Understanding the molecular structure and diversity of these LGICs is critical for addressing the global challenge of insecticide resistance in head louse populations [4].

Other names

Head louse neuronal ligand-gated ion channelsPediculus humanus capitis Cys-loop receptorsLouse LGICs

Positive allosteric modulation of glutamate-gated chloride channels, agonism of nicotinic acetylcholine receptors, and antagonism of GABA-gated chloride channels.