title: Synaptic effects of the synthetic pyrethroid resmethrin in rat brain in vitro.
abstract: Resmethrin (30 microM) induced release of transmitters was not affected by manipulation of the Na+ current with either choline or tetrodotoxin agents which readily reversed the effects of veratridine, deltamethrin and cypermethrin. Resmethrin (I50: 2.2 microM) inhibited the ATP dependent uptake of Ca2+ but deltamethrin and cypermethrin were much less effective. Resmethrin also displaced Ca2+ from crude synaptosomal membranes. The release promoting effects of resmethrin in rat brain in vitro are better explained by its effects on Ca2+ rather than through a specific effect on the Na+ channel. In contrast, the effects of deltamethrin and cypermethrin promote transmitter release by a Na+ dependent process.
mesh_terms: D000818:Animals; D001693:Biological Transport, Active / Q000187:drug effects; D001921:Brain / Q000187:drug effects / Q000502:physiology*; D002118:Calcium / Q000378:metabolism; D007631:Chlordecone / Q000494:pharmacology; D003342:Corpus Striatum / Q000187:drug effects / Q000502:physiology; D003634:DDT / Q000494:pharmacology; D004298:Dopamine / Q000378:metabolism; D007700:Kinetics; D008297:Male; D009638:Norepinephrine / Q000378:metabolism; D011722:Pyrethrins / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains; D013569:Synapses / Q000187:drug effects / Q000502:physiology*; D014701:Veratridine / Q000494:pharmacology; D005680:gamma-Aminobutyric Acid / Q000378:metabolism
chemical_list: D011722:Pyrethrins; C017160:cypermethrin; D005680:gamma-Aminobutyric Acid; D014701:Veratridine; D003634:DDT; D007631:Chlordecone; D002118:Calcium; D004298:Dopamine; D009638:Norepinephrine; C100036:resmethrin