Parasite-specific gamma-aminobutyric acid-gated chloride channel

Parasite-specific gamma-aminobutyric acid-gated chloride channels are ligand-gated ion channels found in the nervous system of parasitic worms such as nematodes. These receptors are structurally and functionally similar to mammalian GABAA receptors, mediating inhibitory neurotransmission by allowing the flow of chloride ions into neurons, which hyperpolarizes the membrane and leads to muscle relaxation or paralysis in the parasite[2]. GABAergic chloride channels are key regulators of neuromuscular function and serve as important therapeutic targets for several classes of anthelmintic drugs, although their pharmacology can differ significantly from mammalian homologs, influencing drug selectivity and efficacy[2][3]. They are distinct from but evolutionarily and pharmacologically related to the glutamate-gated chloride channels, which are the primary targets of macrocyclic lactone anthelmintics[1]. Resistance can develop through mutations, making detailed understanding of these channels essential for antiparasitic drug development[3].

Other names

Parasite GABA-gated chloride channelHelminth GABAA-like receptorγ-aminobutyric acid-gated chloride channel (in parasites)

Agonism—hyperpolarizing nervous/muscular membranes by increasing chloride conductance, causing paralysis; Antagonism—blocking channel function disrupts neurotransmission