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Type: Artigo de periódico
Title: Neurotoxic and myotoxic actions from Lachesis muta muta (surucucu) whole venom on the mouse and chick nerve-muscle preparations
Author: Damico, DCS
Bueno, LGF
Rodrigues-Simioni, L
Marangoni, S
da Cruz-Hofling, MA
Novello, JC
Abstract: Lachesis genus is one of the less studied among others from Viperidae's genera, mainly due to difficulties in obtaining the venom. Accidents by Lachesis snakes cause severe envenoming syndrome, eventually leading victims to shock. This work is part of a comprehensive study aimed at studying the venom and its effects. Herein the neurotoxicity and myotoxicity of L. muta muta venom were investigated on mouse phrenic nerve-diaphragm (PNDp) and chick biventer cervicis (BCp) preparations. For both preparations the time required to venom produces 50% neuromuscular blockade was indirectly concentration-dependent, being for PNDp: 117.6 +/- 6.5 min (20 mu g/ml), 70.1 +/- 8.6 min (50 mu g/ml) and 43.6 +/- 3.8 min (100 mu g/ml), and for BCp: 28 +/- 1.8 min (50 mu g/ml), 30.4 +/- 2.3 min (10 mu g/ml), 50.4 +/- 4.3 min (5 mu g/ml) and 75.2 +/- 0.7 min (2 mu g/ml), (n = 5/dose). In BCp, a venom dose of 50 mu g/ml significantly reduced contractures elicited by exogenous acetylcholine (55 mu M) and KCl (20 mM), as well as increased the release of creatine kinase (442.7 +/- 39.8 IU/l in controls vs 4322.6 +/- 395.2 IU/l, after 120 min of venom incubation (P < 0.05). Quantification of myonecrosis in BCp indicated the doses 50 and 10 mu g/ml as significantly myotoxic affecting 59.7 +/- 6.2%, and 20.8 +/- 1.2% of fibers, respectively, whereas 5 and 2 mu g/ml that affected 13.5 +/- 0.8% and 5.4 +/- 0.6% of fibers, were considered weakly- and non-myotoxic, respectively. We concluded that there are neurotoxins present in the venom, the concentration of which governs its pre- (if low) or postsynaptic (if high) activity. Since myotoxicity in the avian preparation is negligible at lower venom doses, but not neurotoxicity, we suggest that this effect may contribute minimum to the venom neurotoxic effect. The BCp is more sensible than PNDp to Lachesis in. muta venom. (c) 2005 Elsevier Ltd. All rights reserved.
Subject: biventer cervicis preparation
Lachesis muta muta venom
mouse phrenic nerve-diaphragm
myotoxicity
neuromuscular blockade
neurotoxicity
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Rights: fechado
Identifier DOI: 10.1016/j.toxicon.2005.04.011
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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