Data/hora: 08/06/2024 19:05:54

Provedor de dados: 	80	
País: 	Brazil	
Título: 	Neuromuscular activity of Bothrops neuwiedi pauloensis snake venom in mouse nerve-muscle preparations	
Autores: 	Durigon,A. M.; Borja-Oliveira,C. R.; Dal Belo,C. A.; Oshima-Franco,Y.; Cogo,J. C.; Lapa,A. J.; Souccar,C.; Rodrigues-Simioni,L.	
Data: 	2005-03-01	
Ano: 	2005	
Palavras-chave: 	Giant MEPPs; Myotoxicity; Neurotoxicity; Presynaptic action.	
Resumo: 	The pharmacological effects of Bothrops neuwiedi pauloensis venom on mouse phrenic nerve-diaphragm (PND) preparations were studied. Venom (20 mug/ml) irreversibly inhibited indirectly evoked twitches in PND preparations (60 ± 10% inhibition, mean ± SEM; p&lt;0.05; n=6). At 50 mug/ml, the venom blocked indirectly and directly (curarized preparations) evoked twitches in mouse hemidiaphragms. In the absence of Ca2+, venom (50 mug/ml), produced partial blockade only after an 80 min incubation, which reached 40.3 ± 7.8% (p&lt;0.05; n=3) after 120 min. Venom (20 mug/ml) increased (25 ± 2%, p&lt; 0.05) the frequency of giant miniature end-plate potentials in 9 of 10 end-plates after 30 min and the number of miniature end-plate potentials which was maximum (562 ± 3%, p&lt;0.05) after 120 min. During the same period, the resting membrane potential decreased from - 81 ± 1.4 mV to - 41.3 ± 3.6 mV 24 fibers; p&lt;0.01; n=4) in the end-plate region and from - 77.4 ± 1.4 to -44.6 ± 3.9 mV (24 fibers; p&lt;0.01; n=4) in regions distant from the end-plate. These results indicate that B. n. pauloensis venom acts primarily at presynaptic sites. They also suggest that enzymatic activity may be involved in this pharmacological action.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992005000100004	
Editor: 	Centro de Estudos de Venenos e Animais Peçonhentos	
Relação: 	10.1590/S1678-91992005000100004	
Formato: 	text/html	
Fonte: 	Journal of Venomous Animals and Toxins including Tropical Diseases  v.11 n.1 2005	
Fonte: 	info:eu-repo/semantics/openAccess