Full Neutralization of Centruroidessculpturatus Scorpion Venom by Combining Two Human Antibody Fragments.
Toxins (Basel)
; 13(10)2021 10 06.
Article
em En
| MEDLINE
| ID: mdl-34679001
A fundamental issue of the characterization of single-chain variable fragments (scFvs), capable of neutralizing scorpion toxins, is their cross-neutralizing ability. This aspect is very important in Mexico because all scorpions dangerous to humans belong to the Centruroides genus, where toxin sequences show high identity. Among toxin-neutralizing antibodies that were generated in a previous study, scFv 10FG2 showed a broad cross-reactivity against several Centruroides toxins, while the one of scFv LR is more limited. Both neutralizing scFvs recognize independent epitopes of the toxins. In the present work, the neutralization capacity of these two scFvs against two medically important toxins of the venom of Centruroides sculpturatus Ewing was evaluated. The results showed that these toxins are recognized by both scFvs with affinities between 1.8 × 10-9 and 6.1 × 10-11 M. For this reason, their ability to neutralize the venom was evaluated in mice, where scFv 10FG2 showed a better protective capacity. A combination of both scFvs at a molar ratio of 1:5:5 (toxins: scFv 10FG2: scFv LR) neutralized the venom without the appearance of any signs of intoxication. These results indicate a complementary activity of these two scFvs during venom neutralization.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Venenos de Escorpião
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Escorpiões
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Anticorpos Neutralizantes
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Anticorpos de Cadeia Única
Limite:
Animals
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Female
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Humans
Idioma:
En
Revista:
Toxins (Basel)
Ano de publicação:
2021
Tipo de documento:
Article
País de afiliação:
México
País de publicação:
Suíça