A catalytic antibody A17 and its mutants highly efficiently interact with organophosphorus pesticide paraoxon. In this work, we studied the protective properties of antibody A17-K47 in paraoxon poisoning using a mouse model. The optimal paraoxon dose simulating the acute toxic effect of organophosphorus compounds was 550 μg/kg. The pharmacokinetic parameters of A17-K47 antibody were t1/2distr =7.2±1.4 min, t1/2el =330±20 min. The antibody did not cause toxic effects when administered at a ten-fold calculated therapeutic dose (610 mg/kg). The drug did not reduce mortality from acute paraoxon poisoning; however, the absence of drug toxicity opens up prospects for its use in symptomatic treatment of chronic paraoxon poisoning.
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