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Registros recuperados: 6
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Effects of manganese (Mn2+) on neurotoxic and myotoxic activities induced by Crotalus durissus terrificus and Bothrops jararacussu venoms in chick biventer cervicis preparations J. Venom. Anim. Toxins incl. Trop. Dis.
Bueno,L. G. F.; Leite,G. B.; Cruz-Höfling,M. A.; Rodrigues-Simioni,L.; Oshima-Franco,Y..
In the present study, manganese (Mn2+), a neuromuscular blocker with pre and postsynaptic actions, was used to verify the neurotoxicity and myotoxicity induced by Crotalus durissus terrificus (Cdt) and Bothrops jararacussu (Bjssu) venoms in biventer cervicis preparations (BCp). Preparations pretreated with 0.66 and 1.6mM Mn2+ did not affect Cdt venom-induced blockage nor change KCl-induced contracture but partially reduced ACh-induced contracture. However, both Mn2+ concentrations partially hindered Bjssu venom-induced blockage after washing the preparations with Krebs solution, and only 1.6mM Mn2+ preparations significantly recovered ACh-induced contracture. The effect of Cdt venom myotoxicity on contractile responses was different from that of Bjssu...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Contracture; Divalent cation; Mn2+; Myotoxicity; Neuromuscular blockage; Neurotoxicity.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992007000200007
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Neuromuscular activity of Bothrops neuwiedi pauloensis snake venom in mouse nerve-muscle preparations J. Venom. Anim. Toxins incl. Trop. Dis.
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..
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<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<0.05; n=3) after 120 min. Venom (20 mug/ml) increased (25 ± 2%, p< 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 ±...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Giant MEPPs; Myotoxicity; Neurotoxicity; Presynaptic action.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992005000100004
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Neutralization of the neuromuscular activity of bothropstoxin-i, a myotoxin from Bothrops jararacussu snake venom, by a hydroalcoholic extract of Casearia sylvestris Sw. (guaçatonga) J. Venom. Anim. Toxins incl. Trop. Dis.
Oshima-Franco,Y.; Alves,C. M. V.; Andréo Filho,N.; Gerenutti,M.; Cintra,A. C. O.; Leite,G. B.; Rodrigues-Simioni,L.; Silva,M. G..
Numerous plants are used as snakebite antidotes in Brazilian folk medicine, including Casearia sylvestris Swartz, popularly known as guaçatonga. In this study, we examined the action of a hydroalcoholic extract from C. sylvestris on the neuromuscular blockade caused by bothropstoxin-I (BthTX-I), a myotoxin from Bothrops jararacussu venom, in mouse isolated phrenic nerve-diaphragm (PND) preparations. Aqueous (8 and 12 mg/ml, n=4 and 5, respectively) and hydroalcoholic (12 mg/ml, n=12) extracts of the leaves of C. sylvestris caused facilitation in PND preparations followed by partial neuromuscular blockade. BthTX-I (20 µg/ml, n=4) caused 50% paralysis after 65±15 min (mean ± S.E.M). Preincubation (30 min at 37° C) of BthTX-I (20 µg/ml, n=4) with a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Alternative medicine; Phytotherapy; Plant extracts; Snakebite.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992005000400007
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Purification and n-terminal sequencing of two presynaptic neurotoxic PLA2, neuwieditoxin-I and neuwieditoxin-II, from Bothrops neuwiedi pauloensis (jararaca pintada) venom J. Venom. Anim. Toxins incl. Trop. Dis.
Borja-Oliveira,C. R.; Kassab,B. H.; Soares,A. M.; Toyama,M. H.; Giglio,J. R.; Marangoni,S.; Re,L.; Rodrigues-Simioni,L..
Two presynaptic phospholipases A2 (PLA2), neuwieditoxin-I (NeuTX-I) and neuwieditoxin-II (NeuTX-II), were isolated from the venom of Bothrops neuwiedi pauloensis (BNP). The venom was fractionated using molecular exclusion HPLC (Protein-Pak 300SW column), followed by reverse phase HPLC (µBondapak C18 column). Tricine-SDS-PAGE in the presence or absence of dithiothreitol showed that NeuTX-I and NeuTX-II had a molecular mass of approximately 14 kDa and 28kDa, respectively. At 10µg/ml, both toxins produced complete neuromuscular blockade in indirectly stimulated chick biventer cervicis isolated preparation without inhibiting the response to acetylcholine, but NeuTX-II reduced the response to KCl by 67.0±8.0% (n=3; p<0.05). NeuTX-I and NeuTX-II are probably...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chick biventer cervicis; Loose patch clamp; Nerve-muscle preparation; Neuromuscular junction; Neurotoxicity; PLA2 neurotoxin; Presynaptic action; Bothrops neuwiedi pauloensis; Neuwieditoxin-I; Neuwieditoxin-II.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992007000100008
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Rabbit antivenom efficacy against myotoxic and neurotoxic activities of Bothrops jararacussu venom and bothropstoxin-I J. Venom. Anim. Toxins
Oshima-Franco,Y.; Leite,G. B.; Valério,A. A.; Hyslop,S.; Andriao-Escarso,S.; Giglio,J. R.; Prado-Franceschi,J.; Cruz-Höfling,M. A.; Rodrigues-Simioni,L..
Bothrops jararacussu venom and its major toxin bothropstoxin-I (BthTX-I) possess myotoxic and neurotoxic properties. The efficacy of a rabbit antivenom raised against B. jararacussu venom in the neutralization of physiological, biochemical, and morphological changes induced by the venom and its major toxin BthTX-I was studied in mouse isolated phrenic nerve-diaphragm (PND) and extensor digitorum longus (EDL) preparations. The times required for 50% neuromuscular blockade in PND and EDL preparations for venom were 70+11.5 (S.E.M., n=5) min and 58+8 (n=16) (50 mu g/mL), and for BthTX-I 31+6 (n=3) min and 30+3 (n=5) min (20 mu g/mL), respectively. After 120 min incubation, creatine kinase (CK) concentrations in solution containing the EDL preparations were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bothrops venom; Myotoxin; Neutralization; Neuromuscular junction; Histological analysis; Bothrops jararacussu.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-79302002000200004
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The pharmacological effect of Bothrops neuwiedii pauloensis (jararaca-pintada) snake venom on avian neuromuscular transmission BJMBR
Borja-Oliveira,C.R.; Durigon,A.M.; Vallin,A.C.C.; Toyama,M.H.; Souccar,C.; Marangoni,S.; Rodrigues-Simioni,L..
The neuromuscular effects of Bothrops neuwiedii pauloensis (jararaca-pintada) venom were studied on isolated chick biventer cervicis nerve-muscle preparations. Venom concentrations of 5-50 µg/ml produced an initial inhibition and a secondary increase of indirectly evoked twitches followed by a progressive concentration-dependent and irreversible neuromuscular blockade. At venom concentrations of 1-20 µg/ml, the responses to 13.4 mM KCl were inhibited whereas those to 110 µM acetylcholine alone and cumulative concentrations of 1 µM to 10 mM were unaffected. At venom concentrations higher than 50 µg/ml, there was pronounced muscle contracture with inhibition of the responses to acetylcholine, KCl and direct stimulation. At 20-24ºC, the venom (50 µg/ml)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chick biventer cervicis; Myotoxicity; Neurotoxicity; Phospholipase A2; Presynaptic action.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000500009
Registros recuperados: 6
Primeira ... 1 ... Última
 

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