Nematode gamma-aminobutyric acid receptor (GABA receptor) (GABA receptor)

Nematode gamma-aminobutyric acid (GABA) receptors are essential ligand-gated ion channels that mediate inhibitory neurotransmission within the nematode nervous system and neuromuscular junctions (Bamber et al., 1999, PMID: 10526344). These receptors, primarily belonging to the Cys-loop superfamily, function as GABA-gated chloride channels that regulate muscle tone and coordinated movement (Holden-Dye and Walker, 2014, WormBook). In parasitic nematodes, these receptors are critical for maintaining the balance between excitation and inhibition; their activation typically leads to hyperpolarization and muscle relaxation (Martin, 1997, PMID: 9396615). Because of their vital role in parasite physiology and their structural divergence from mammalian GABA receptors, they serve as primary targets for various anthelmintic and insecticidal agents (Raymond and Sattelle, 2002, PMID: 12160854). Drugs such as piperazine act as agonists to induce flaccid paralysis, while others like fipronil and the isoxazoline class act as non-competitive antagonists (Bloomquist, 2003, PMID: 12814153). Understanding these receptors is crucial for addressing the growing challenge of anthelmintic resistance in veterinary and human medicine (Wolstenholme, 2011, PMID: 21511039).

Other names

Nematode GABA-gated chloride channelUNC-49LGC-35GAB-1GABA-A-like receptorNematode inhibitory GABA receptor

Agonists (e.g., piperazine) activate the receptor to induce chloride influx and hyperpolarization, leading to flaccid paralysis in the parasite; non-competitive antagonists (e.g., fipronil, isoxazolines) block the channel to prevent inhibitory signaling, resulting in hyperexcitation and death.