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| Registros recuperados: 65 | |
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| El-Aziz,Tarek Mohamed Abd; Khoury,Sawsan Al; Jaquillard,Lucie; Triquigneaux,Mathilde; Martinez,Guillaume; Bourgoin-Voillard,Sandrine; Sève,Michel; Arnoult,Christophe; Beroud,Rémy; Waard,Michel De. |
| Abstract Background Sperm contains a wealth of cell surface receptors and ion channels that are required for most of its basic functions such as motility and acrosome reaction. Conversely, animal venoms are enriched in bioactive compounds that primarily target those ion channels and cell surface receptors. We hypothesized, therefore, that animal venoms should be rich enough in sperm-modulating compounds for a drug discovery program. Our objective was to demonstrate this fact by using a sperm-based phenotypic screening to identify positive modulators from the venom of Walterinnesia aegyptia. Methods Herein, as proof of concept that venoms contain interesting compounds for sperm physiology, we fractionated Walterinnesia aegyptia snake venom by RP-HPLC and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Snake venom; Walterinnesia aegyptia; Bioactive compounds; Fertility; Sperm motility; Venomics; Tandem mass spectrometry; De novo sequencing; Edman degradation. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992018000100301 |
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| RAHMY,T. R.. |
| The effect of intramuscular (IM) injection of a sub-lethal dose of Naja haje cobra venom (0.015 mug/gm body weight) on the ultrastructure of renal cortical tissues of rabbits was studied at different time intervals after envenomation. Succinic dehydrogenase (SDH) enzyme activity was also detected in the renal cortical tubules. Three hours after venom injection, slight changes were seen in visceral cells and glomerular endothelia. The cortical tubular epithelia revealed an increase of lysosomal structures, cytoplasmic vacuolization, and nuclear irregularity. Severe ultrastructural changes were recorded 6 hours after envenomation, including hypertrophied parietal cells, blebbed visceral epithelial cells, and foot process disorganization. Dilated glomerular... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Snake venom; Nephrotoxicity; Kidney; Ultrastructure. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-79302001000100007 |
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| BARRAVIERA,B.; LOMONTE,B.; TARKOWSKI,A.; HANSON,L. Å.; MEIRA,D.A.. |
| Thirty-one patients bitten by venomous snakes in Botucatu area (State of São Paulo - Brazil), sixteen by Bothrops spp. and fifteen by Crotalus durissus terrificus, were studied. The group comprised twenty-nine males and two females, ranging from fourteen to sixty-three years of age (mean 33 ± 15). Leukocytosis with neutrophilia and lymphopenia, increase of mucoproteins and C-reactive protein, decrease of total serum protein and albumin, were observed on the first day after the accident. In addition, increased serum levels of the cytokines IL-6 and IL-8, but not of IL-1<FONT FACE="Symbol">b</FONT> and TNF-<FONT FACE="Symbol">a</FONT>, were observed. The alterations were generally more intense in patients bitten by Crotalus durissus... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Snake venom; Acute-phase reactions; Cytokines; C-reactive protein; Inflammation. |
| Ano: 1995 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-79301995000100003 |
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| Selistre-de-Araujo,H.S.; Cominetti,M.R.; Terruggi,C.H.B.; Mariano-Oliveira,A.; De Freitas,M.S.; Crepin,M.; Figueiredo,C.C.; Morandi,V.. |
| The alpha2ß1 integrin is a major collagen receptor that plays an essential role in the adhesion of normal and tumor cells to the extracellular matrix. Alternagin-C (ALT-C), a disintegrin-like protein purified from the venom of the Brazilian snake Bothrops alternatus, competitively interacts with the alpha2ß1 integrin, thereby inhibiting collagen binding. When immobilized in plate wells, ALT-C supports the adhesion of fibroblasts as well as of human vein endothelial cells (HUVEC) and does not detach cells previously bound to collagen I. ALT-C is a strong inducer of HUVEC proliferation in vitro. Gene expression analysis was done using an Affimetrix HU-95A probe array with probe sets of ~10,000 human genes. In human fibroblasts growing on collagen-coated... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alpha2ß1 integrin; Disintegrin; Snake venom; Adhesion; Gene expression; Extracellular matrix. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005001000007 |
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| LEITE,C.V.S.; NARESSE,L.E.; ARANTES,H.L.; LOPES,A.F.; THOMAZINI-SANTOS,I.A.; GIANNINI,M.J.S; MERCADANTE,M.C.; BARRAVIERA,B.; KOBAYASI,S.. |
| The objective of this study was to evaluate the efficacy of fibrin adhesive made up of snake venom and bubaline fibrinogen by rat colon anastomosis. Eighty rats were randomly assigned into 2 experimental groups: GI control (anastomosis with extramucous interrupted suture) and GII (repair suture + fibrin glue). The animals were studied at the following 4 times: T0 preoperative, T1 7th day postoperative, T2 14th day postoperative, and T3 21 st day postoperative. The macroscopic characteristics of the intestinal segment open and closed anastomosis and the bursting strength of the anastomosed segments were observed at each of the above times. The results showed that the anastomosed segments coapted and there was no difference in the bursting strength... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fibrin glue; Experimental healing; Bursting strength; Experimental anastomosis; Snake venom; Colon anastomosis. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-79302000000200004 |
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| Alves,N.T.Q.; Ximenes,R.M.; Jorge,R.J.B.; Silveira,J.A.M.; Santos,J.V.A.; Rodrigues,F.A.P.; Costa,P.H.S.; Xavier Jr.,F.A.F.; Evangelista,J.S.A.M.; Havt,A.; Soares,V.C.G.; Toyama,M.H.; Oliveira,A.N.A.; Araújo,R.M.; Alves,R.S.; Monteiro,H.S.A.. |
| Bredemeyera floribunda roots are popularly used to treat snakebites in the semiarid region of Northeast Brazil, and previous studies indicate the anti-ophidian actions of triterpenoid saponins found in its roots. To assess B. floribunda root extract (BFRE) activity against the effects of Bothrops jararacussu venom (BjuV), antiphospholipasic, antiproteolytic, antihemorrhagic, antinecrotic, and anti-edematogenic activities were investigated in mice. Phytochemical analysis revealed the presence of saponins, flavonoids, and sugars, with rutin and saccharose being the major constituents of BFRE. Acute toxicity was determined and BFRE was nontoxic to mice. Phospholipase A2 and proteolytic activities induced by BjuV were inhibited in vitro by BFRE at all... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bredemeyera floribunda; Snakeroot; Snake venom; Rutin; Antihemorrhagic; Anti-edematogenic. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2019000100608 |
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| De Paula,RC; Sanchez,EF; Costa,TR; Martins,CHG; Pereira,PS; Lourenço,MV; Soares,AM; Fuly,AL. |
| Snakebites comprise a serious health problem in several countries due to their global incidence, which exceeds 2.5 million per year, and the elevated number of victim fatalities. To counteract envenomations, antivenoms have been used regularly for more than a century. Apart from side effects including anaphylactic reactions, antivenoms are not able to efficiently neutralize local tissue damage, which contributes to increasing the severity and morbidity observed in patients. This fact, in turn, may be responsible for economic hardship, particularly in rural populations of developing countries. In the present work, we evaluated the antiophidian properties of 12 Brazilian plant extracts against the hemolytic, coagulant, hemorrhagic and proteolytic effects of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Snake venom; Lachesis muta; Plant extract; Antivenom; Biological activities. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992010000200012 |
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| Duan,Hai-long; He,Qi-yi; Zhou,Bin; Wang,Wen-wen; Li,Bo; Zhang,Ying-zheng; Deng,Qiu-ping; Zhang,Ying-feng; Yu,Xiao-dong. |
| Abstract Background Snakebite incidence in southwestern China is mainly attributed to one of the several venomous snakes found in the country, the white-lipped green pit viper Trimeresurus albolabris. Since antivenom produced from horses may cause numerous clinical side effects, the present study was conducted aiming to develop an alternative antivenom antibody (immunoglobulin Y - IgY) from leghorn chickens. Methods IgY in egg yolk from white leghorn chicken previously injected with T. albolabris venom was extracted by water, precipitated by ammonium sulfate and purified by affinity chromatographic system. IgY was identified by SDS-PAGE, ELISA and Western blot, and its neutralizing assay was conducted on mice. Results Chickens injected multiple times... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: IgY; Egg yolk; Snake venom; Trimeresurus albolabris; LD50. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992016000100316 |
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| MADY,E. A.. |
| The search for snake venom antitumor efficacy has attracted the interest of scientists since the beginning of last century. Snake venom possesses a wide spectrum of biological activities. In this study, we evaluated the effect of Echis coloratus crude venom on the evolution of Ehrlich ascites carcinoma cells (EAC). Normal and EAC-bearing mice were treated with 0.2 mg/kg body weight of crude venom. Crude venom was seen to suppress tumor growth by significantly decreasing EAC cell count and cell viability (p<0.01). There was also a significant increase in survival time of the venom-treated tumor-bearing mice (52.3%, p<0.05) in comparison to the non-treated tumor-bearing counterparts. The study of venom effect and/or tumor inoculation on some important... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Snake venom; Echis coloratus; Ehrlich ascites carcinoma; Tumor growth; Biochemistry. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-79302002000200008 |
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| Mata,Élida Cleyse Gomes da; Mourão,Caroline Barbosa Farias; Rangel,Marisa; Schwartz,Elisabeth Ferroni. |
| Abstract Viruses exhibit rapid mutational capacity to trick and infect host cells, sometimes assisted through virus-coded peptides that counteract host cellular immune defense. Although a large number of compounds have been identified as inhibiting various viral infections and disease progression, it is urgent to achieve the discovery of more effective agents. Furthermore, proportionally to the great variety of diseases caused by viruses, very few viral vaccines are available, and not all are efficient. Thus, new antiviral substances obtained from natural products have been prospected, including those derived from venomous animals. Venoms are complex mixtures of hundreds of molecules, mostly peptides, that present a large array of biological activities and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antiretroviral agents; Antiviral agents; HIV; Scorpion venom; Snake venom; Amphibian venom; Insect venom; Marine animal peptides. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992017000100200 |
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| Matias,Mariana Santos; Sousa,Bruna Barbosa de; Pereira,Déborah Fernanda da Cunha; Dias,Edigar Henrique Vaz; Mamede,Carla Cristine Neves; Queiroz,Mayara Ribeiro de; Silva,Anielle Christine Almeida; Dantas,Noelio Oliveira; Soares,Andreimar Martins; Costa,Júnia de Oliveira; Oliveira,Fábio de. |
| Abstract Background: Snake venoms are a complex mixture of proteins, organic and inorganic compounds. Some of these proteins, enzymatic or non-enzymatic ones, are able to interact with platelet receptors, causing hemostatic disorders. The possible therapeutic potential of toxins with antiplatelet properties may arouse interest in the pharmacological areas. The present study aimed to purify and characterize an antiplatelet DC protein from Bothrops alternatus snake venom. Methods: The protein, called BaltDC (DC protein from B. alternatus snake venom), was purified by a combination of ion-exchange chromatography on DEAE-Sephacel column and gel filtration on Sephadex G-75. The molecular mass was estimated by polyacrylamide gel electrophoresis in the presence... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Snake venom; Bothrops alternatus; DC protein; Platelet aggregation. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992017000100324 |
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| Turones,L.C.; Cruz,K.R. da; Camargo-Silva,G.; Reis-Silva,L.L.; Graziani,D.; Ferreira,P.M.; Galdino,P.M.; Pedrino,G.R.; Santos,R.; Costa,E.A.; Ianzer,D.; Xavier,C.H.. |
| The heptapeptide Bj-PRO-7a, isolated and identified from Bothrops jararaca (Bj) venom, produces antihypertensive and other cardiovascular effects that are independent on angiotensin converting enzyme inhibition, possibly relying on cholinergic muscarinic receptors subtype 1 (M1R). However, whether Bj-PRO-7a acts upon the central nervous system and modifies behavior is yet to be determined. Therefore, the aims of this study were: i) to assess the effects of acute administration of Bj-PRO-7a upon behavior; ii) to reveal mechanisms involved in the effects of Bj-PRO-7a upon locomotion/exploration, anxiety, and depression-like behaviors. For this purpose, adult male Wistar (WT, wild type) and spontaneous hypertensive rats (SHR) received intraperitoneal... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bj-PRO-7a; Snake venom; Neuroactive compounds; Anxiety; Depression; Behavior. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2019001100606 |
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| Bordon,Karla C. F.; Wiezel,Gisele A.; Cabral,Hamilton; Arantes,Eliane C.. |
| BackgroundCrotalus durissus terrificus venom (CdtV) is one of the most studied snake venoms in Brazil. Despite presenting several well known proteins, its L-amino acid oxidase (LAAO) has not been studied previously. This study aimed to isolate, characterize and evaluate the enzyme stability of bordonein-L, an LAAO from CdtV.Methods The enzyme was isolated through cation exchange, gel filtration and affinity chromatography, followed by a reversed-phase fast protein liquid chromatography to confirm its purity. Subsequently, its N-terminal amino acid sequence was determined by Edman degradation. The enzyme activity and stability were evaluated by a microplate colorimetric assay and the molecular mass was estimated by SDS-PAGE using periodic acid-Schiff... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crotalus durissus terrificus; L-amino acid oxidase; Rattlesnake; Enzyme activity; Enzyme stability; Chromatography; Snake venom; Yellow venom; Stabilization. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992015000100335 |
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| Santos,W.G.; Silveira,T.L.; Fiúza,A.T.L.; Botelho,A.F.M.; Gonçalves,I.N.N.; Ferreira,E.; Soto-Blanco,B.; Melo,M.M.. |
| RESUMO Este estudo objetiva reportar a ocorrência de apoptose in vivo induzida pelo veneno da serpente Bothrops alternatus em células musculares esqueléticas. Cinco coelhos machos, adultos, receberam 150μg/kg de veneno no músculo vasto lateral, enquanto outros cinco animais receberam 0,1% de BSA diluído em PBS no mesmo local. Após 12 horas, os animais foram eutanasiados, e amostras do local de inoculação foram coletadas para análise histopatológica. Foram evidenciadas necrose e hemorragia nas células musculares. Além disso, a análise imuno-histoquímica para identificação de caspase-3 ativada revelou marcações granulares e agregadas no citoplasma das células musculares, compatíveis com o processo de apoptose. Este é o primeiro relato que confirma o veneno... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Snake venom; Botropic venom; Apoptosis; Toxicology; Rabbit. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352019000100349 |
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| Ayres,Lorena Rocha; Récio,Alex dos Reis; Burin,Sandra Mara; Pereira,Juliana Campos; Martins,Andrea Casella; Sampaio,Suely Vilela; Castro,Fabíola Attié de; Pereira-Crott,Luciana Simon. |
| Background Activation of the complement system plays an important role in the regulation of immune and inflammatory reactions, and contributes to inflammatory responses triggered by envenomation provoked byBothrops snakes. The present study aimed to assess whether Bothrops jararacussuand Bothrops pirajai crude venoms and their isolated toxins, namely serine protease (BjussuSP-I) and L-amino acid oxidase (BpirLAAO-I), modulate human complement system pathways.Methods Lyophilized venom and toxin samples solubilized in phosphate buffered saline were diluted in appropriate buffers to evaluate their hemolytic activity on the alternative and classical pathways of the complement system. Venom- and toxin-treated normal human serum was added to the erythrocyte... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bothrops jararacussu; Bothrops pirajai; Chemotaxis; Complement system; Kinetic microassay; L-amino acid oxidase; Serine protease; Snake venom. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992015000100336 |
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| Registros recuperados: 65 | |
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