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- W1978508973 abstract "The effect of piperonyl butoxide on the acute toxicity of phosphorothionate insecticides was studied in male mice. One hour after piperonyl butoxide (400 mg/kg), the toxicity of the dimethyl phosphorothionates, methyl parathion and Guthion, was antagonized, whereas the toxicity of their respective diethyl homologs, parathion and Ethyl Guthion, was potentiated. Piperonyl butoxide did not appreciably alter the toxicity of the oxygen analogs of these compounds. Pretreatment with SKF 525-A (50 mg/kg) modified the toxicity of the phosphorothionates in a manner qualitatively similar to piperonyl butoxide pretreatment. Plasma concentrations of all four insecticides were increased three- to sevenfold in piperonyl butoxide-pretreated mice. This increase may result in a greater total oxon formation; however, reactivation in vitro of esterases inhibited in vivo was 5 to 10 times more rapid following methyl parathion or Guthion challenge than after their diethyl homologs. Although a greater total oxon formation-cholinesterase inhibition is possible for both dimethyl and diethyl phosphorothionates following piperonyl butoxide pretreatment, rapid reactivation of inhibited nerve tissue cholinesterases after dimethyl phosphorothionate challenge appears to compensate for further inhibition occurring at a decreased rate. The net result would be a reduction in dimethyl phosphorothionate toxicity. In contrast, slow reactivation of inhibited nerve tissue cholinesterases following diethyl phosphorothionate challenge appears unable to compensate for increased oxon formation-cholinesterase inhibition. The net result is a potentiation of the toxicity of the diethyl-substituted compounds." @default.
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- W1978508973 date "1977-06-01" @default.
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- W1978508973 title "Esterase inhibition and reactivation in relation to piperonyl butoxide-phosphorothionate interactions" @default.
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- W1978508973 doi "https://doi.org/10.1016/0041-008x(77)90066-7" @default.
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