Centruroides noxius neurotoxins (CnTx)

Centruroides noxius neurotoxins are a group of potent peptides found in the venom of the Mexican bark scorpion, one of the most dangerous scorpion species in Mexico [UniProt P01491]. These toxins, particularly the alpha-toxins like Cn1, primarily target voltage-gated sodium channels (Nav) in the nervous system [PubMed: 11566114]. By binding to neurotoxin receptor site 3 on the sodium channel, they slow down the inactivation process, leading to prolonged depolarization and repetitive firing of neurons [PubChem CID 11953901]. This physiological disruption results in severe clinical symptoms known as scorpionism, characterized by autonomic dysfunction, neuromuscular hyperactivity, and potentially fatal respiratory failure [StatPearls]. In a clinical context, these toxins serve as the primary targets for specific antivenom therapies, such as Alacramyn, which utilize antibody fragments to sequester the toxins and prevent their binding to host ion channels [FDA: Anascorp Label]. The toxins are highly specific, with some variants showing preference for mammalian channels while others target insect channels, making them significant subjects in neuropharmacological research [UniProt P01487]. Effective management of envenomation relies on the rapid administration of these antivenoms to neutralize the toxins before irreversible binding occurs.

Other names

Cn1 toxinCn2 toxinMexican bark scorpion neurotoxinsCentruroides alpha-toxinsSodium channel modifier toxins

Antivenoms consist of venom-specific F(ab')2 fragments that bind to and neutralize the circulating neurotoxins, preventing their interaction with voltage-gated sodium channels and facilitating their clearance from the systemic circulation [PubMed: 19446558].