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[Monoclonal antibodies to type A, B, E and F botulinum neurotoxins].
Bioorganicheskaia Khimiia 2011 May
Mouse monoclonal antibodies against the most acutely toxic substances, botulinum neurotoxins (BoNTs) of types A, B, E, and F, was generated and characterized, that recognize their respective toxins in natural toxin complex. Based on these antibodies, we developed sandwich-ELISA for quantitative detection of these toxins. For each respective toxin the detection limit of the assay was: BoNT/A - 0.4 ng/ml, BoNT/B - 0.5 ng/ml; BoNT/E - 0.1 ng/ml; and for BoNT/F - 2.4 ng/ml. The developed assays permitted quantitative identification of the BoNTs in canned meat and vegetables. The BNTA-4.1 and BNTA-9.1 antibodies possessed neutralizing activity against natural complex of the botulinium toxin type A in vivo, both individually and in mixture, the mixture of the antibodies neutralized the higher dose of the toxin. The BNTA-4.1 antibody binds specifically the light chain (the chain with protease activity) of the toxin, whereas BNTA-9.1 interacts with the heavy chain. We believe that the BNTA-4.1 and BNTA-9.1 monoclonal antibodies are prospective candidates for development of humanized therapeutic antibodies for treatment of BoNT/A-caused botulism.
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