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Type: Artigo
Title: Bothrops Fonsecai Snake Venom Activities And Cross-reactivity With Commercial Bothropic Venom
Author: Collaco
Rita de Cassia O.; Randazzo-Moura
Priscila; Tamascia
Mariana L.; da Silva
Igor Rapp F.; Rocha
Thalita; Cogo
Jose C.; Hyslop
Stephen; Sanny
Charles G.; Rodrigues-Simioni
Abstract: In this work, we examined some biochemical and biological activities of Bothrops fonsecai venom, a pitviper endemic to southeastern Brazil, and assessed their neutralization by commercial bothropic antivenom (CAv). Cross-reactivity of venom with CAv was also assessed by immunoblotting and size-exclusion high performance chromatography (SE-HPLC). Bothrops fonsecai venom had PLA(2), proteolytic and esterase activities that were neutralized to varying extents by venom:antivenom ratios of 5:1 and 5:2 (PLA2 and esterase activities) or not significantly by either venom:antivenom ratio (proteolytic activity). The minimum hemorrhagic dose (69.2 mu g) was totally neutralized by both ratios. Clotting time in rat citrated plasma was 33 +/- 10.5 s (mean +/- SD; n = 5) and was completely neutralized by a 5:2 ratio. Edema formation was dose-dependent (1-30 mu g/site) and significantly inhibited by both ratios. Venom (10-300 mu g/mL) caused neuromuscular blockade in extensor digitorum longus preparations; this blockade was inhibited best by a 5:2 ratio. Venom caused myonecrosis and creatine kinase release in vivo (gastrocnemius muscle) and in vitro (extensor digitorum longus) that was effectively neutralized by both venom:antivenom ratios. Immunoblotting showed that venom components of similar to 25-100 kDa interacted with CAv. SE-HPLC profiles for venom incubated with CAv or specific anti-B. fonsecai antivenom raised in rabbits (SAv) indicated that CAv had a higher binding capacity than SAv, whereas SAv had higher affinity than CAv. These findings indicate that B. fonsecai venom contains various activities that are neutralized to different extents by CAv and suggest that CAv could be used to treat envenoming by B. fonsecai. (C) 2016 Published by Elsevier Inc.
Subject: Antivenom Neutralization
Enzymatic Activities
Local Effects
Neuromuscular Blockade
Venom:antivenom Binding
Editor: Elsevier Science Inc
New York
Rights: fechado
Identifier DOI: 10.1016/j.cbpc.2016.08.008
Date Issue: 2017
Appears in Collections:Unicamp - Artigos e Outros Documentos

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