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https://www.readbyqxmd.com/read/29428543/synergistic-strategies-of-predominant-toxins-in-snake-venoms
#1
REVIEW
Shengwei Xiong, Chunhong Huang
Synergism is a significant phenomenon present in snake venoms that may be an evolving strategy to potentiate toxicities. Synergism exists between different toxins or toxin complexes in various snake venoms, with phospholipaseA 2 s (PLA 2 s) (toxins or subunits) the main enablers. The predominant toxins, snake venom PLA 2 s, metalloproteases (SVMPs), serine proteases (SVSPs) and three-finger toxins (3FTxs), play essential roles in synergistic processes. The hypothetical mechanisms of synergistic effect can be generalized under the effects of amplification and chaperoning...
February 8, 2018: Toxicology Letters
https://www.readbyqxmd.com/read/29414889/pharmacokinetics-of-snake-venom
#2
REVIEW
Suchaya Sanhajariya, Stephen B Duffull, Geoffrey K Isbister
Understanding snake venom pharmacokinetics is essential for developing risk assessment strategies and determining the optimal dose and timing of antivenom required to bind all venom in snakebite patients. This review aims to explore the current knowledge of snake venom pharmacokinetics in animals and humans. Literature searches were conducted using EMBASE (1974-present) and Medline (1946-present). For animals, 12 out of 520 initially identified studies met the inclusion criteria. In general, the disposition of snake venom was described by a two-compartment model consisting of a rapid distribution phase and a slow elimination phase, with half-lives of 5 to 48 min and 0...
February 7, 2018: Toxins
https://www.readbyqxmd.com/read/29407870/contributions-of-the-snake-venoms-of-bothrops-asper-crotalus-simus-and-lachesis-stenophrys-to-the-paraspecificity-of-the-central-american-polyspecific-antivenom-polival-icp
#3
Gabriela Solano, Aarón Gómez, Greivin Corrales, Danilo Chacón, Ricardo Estrada, Guillermo León
PoliVal-ICP antivenom is produced from plasma of horses immunized toward the venoms of Bothrops asper, Crotalus simus and Lachesis stenophrys. The antibody response induced by these venoms confers PoliVal-ICP the capacity to neutralize the venoms of the most important Central American viperids, including not only homologous venoms (i.e., venoms used as immunogen), but many heterologous venoms (i.e., venoms not used as immunogen). In this work, the individual contributions of homologous venoms to the paraspecificity of PoliVal-ICP were inferred from the capacity of experimental monospecific antivenoms toward venoms of B...
January 30, 2018: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/29391193/cloning-and-sequencing-of-three-finger-toxins-from-the-venom-glands-of-four-micrurus-species-from-mexico-and-heterologous-expression-of-an-alpha-neurotoxin-from-micrurus-diastema
#4
Jaime Felipe Guerrero-Garzón, Melisa Bénard-Valle, Rita Restano-Cassulini, Fernando Zamudio, Gerardo Corzo, Alejandro Alagón, Alejandro Olvera-Rodríguez
The three-finger toxins (3FTxs) represent an extremely diverse protein family in elapid venoms, where the short chain α-neurotoxins are the most relevant toxin group from the clinical point of view. Essentially, the 3FTxs variability and the low proportions of α-neurotoxins in the venoms of North American coral snakes make it difficult to obtain effective elapid antivenoms against the envenomation symptoms caused mainly by these α-neurotoxins. In this work, thirty 3FTx transcript sequences were obtained from the venom glands of four coral snake species from Mexico (M...
January 29, 2018: Biochimie
https://www.readbyqxmd.com/read/29369078/thromboelastographic-study-of-the-snakebite-related-coagulopathy-in-djibouti
#5
Sébastien Larréché, François-Xavier Jean, Alain Benois, Aurélie Mayet, Aurore Bousquet, Serge Vedy, Patrick Clapson, Céline Dehan, Christophe Rapp, Eric Kaiser, Audrey Mérens, Georges Mion, Christophe Martinaud
: Hemostasis disorders are one of the major clinical conditions of snakebites and are because of mechanisms which may disrupt vessels, platelets, clotting factors and fibrinolysis. Thromboelastography (TEG) could help to understand these effects in the clinical practice. A retrospective study reports a series of patients presenting a snakebite-related coagulopathy, treated with antivenom and monitored with conventional tests and TEG in a French military treatment facility (Republic of Djibouti, East Africa) between August 2011 and September 2013...
March 2018: Blood Coagulation & Fibrinolysis: An International Journal in Haemostasis and Thrombosis
https://www.readbyqxmd.com/read/29363648/increased-efficacy-of-antivenom-combined-with-hyperbaric-oxygen-on-deinagkistrodon-acutus-envenomation-in-adult-rats
#6
Mo Li, Zhi-Hui Xie, An-Yong Yu, Dong-Po He
BACKGROUND: Snakebites are a neglected threat to global human health with a high morbidity rate. The present study explored the efficacy of antivenom with hyperbaric oxygen (HBO) intervention on snakebites, which could provide the experimental basis for clinical adjuvant therapy. METHODS: Male Sprague-Dawley rats (n = 96) were randomized into four groups: the poison model was established by injecting Deinagkistrodon acutus (D. acutus) venom (0.8 LD50) via the caudal vein; the antivenom group was injected immediately with specific antivenom via the caudal vein after successful establishment of the envenomation model; and the antivenom + HBO group was exposed to HBO environment for 1 h once at predetermined periods of 0 h, 4 h, 12 h, and 23 h after antivenin administration...
February 5, 2018: Chinese Medical Journal
https://www.readbyqxmd.com/read/29326487/antitoxin-activity-of-aqueous-extract-of-cyclea-peltata-root-against-naja-naja-venom
#7
Thulasi Sivaraman, N S Sreedevi, S Meenatchisundaram, R Vadivelan
OBJECTIVES: Snakebites are a significant and severe global health problem. Till date, anti-snake venom serum is the only beneficial remedy existing on treating the snakebite victims. As antivenom was reported to induce early or late adverse reactions to human beings, snake venom neutralizing potential for Cyclea peltata root extract was tested for the present research by ex vivo and in vivo approaches on Naja naja toxin. MATERIALS AND METHODS: Ex vivo evaluation of venom toxicity and neutralization assays was carried out...
July 2017: Indian Journal of Pharmacology
https://www.readbyqxmd.com/read/29325746/first-report-of-the-characterization-of-a-snake-venom-apyrase-ruviapyrase-from-indian-russell-s-viper-daboia-russelii-venom
#8
Bhargab Kalita, Aparup Patra, Shagufta Jahan, Ashis K Mukherjee
A novel apyrase from Russell's viper venom (RVV) was purified and characterized, and it was named Ruviapyrase (Russell's viper apyrase). It is a high molecular weight (79.4 kDa) monomeric glycoprotein that contains 2.4% neutral sugars and 58.4% N-linked oligosaccharides and strongly binds to Concanavalin A. The LC-MS/MS analysis did not identify any protein in NCBI protein database, nevertheless some de novo sequences of Ruviapyrase showed putative conserved domain of apyrase superfamily. Ruviapyrase hydrolysed adenosine triphosphate (ATP) to a significantly greater extent (p < ...
January 8, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29295601/identification-of-immunoreactive-peptides-of-toxins-to-simultaneously-assess-the-neutralization-potency-of-antivenoms-against-neurotoxicity-and-cytotoxicity-of-naja-atra-venom
#9
Bin-Sin Liu, Wen-Guey Wu, Min-Han Lin, Chi-Han Li, Bo-Rong Jiang, Suh-Chin Wu, Chih-Hsiang Leng, Wang-Chou Sung
Assessing the neutralization capability of nonlethal but medically relevant toxins in venom has been a challenging task. Nowadays, neutralization efficacy is evaluated based simply on the survival rates of animals injected with antivenom together with a predefined dose of venom, which can determine potency against neurotoxicity but not validate the capability to neutralize cytotoxin-induced complications. In this study, a high correlation with in-vivo and in-vitro neutralization assays was established using the immunoreactive peptides identified from short-chain neurotoxin and cytotoxin A3...
December 25, 2017: Toxins
https://www.readbyqxmd.com/read/29285352/evidence-for-in-vitro-antiophidian-properties-of-aqueous-buds-extract-of-eucalyptus-against-montivipera-bornmuelleri-venom
#10
Joseph Khoury, Ranin Dabbousy, Riyad Sadek, Sayed Antoun, Walid Hleihel, Christian Legros, Ziad Fajloun
Because snake venoms are complex mixtures of bioactive molecules, snake bites produce a large panel of symptoms which cannot be totally prevented by current antivenoms. Thus investigating plant extracts for antivenomics therapy approaches seemed relevant. Here, we evaluated the potency of the aqueous Buds extract of Eucalyptus (ABEE) to counteract the main enzymatic activities of Montivipera bornmuelleri venom. We showed that ABEE efficiently counteracts the proteolytic, Phospholipases A2 (PLA2), and L-aminoacid oxidase activities (LAAO) of M...
2017: Journal of Venom Research
https://www.readbyqxmd.com/read/29275044/functional-and-proteomic-comparison-of-bothrops-jararaca-venom-from-captive-specimens-and-the-brazilian-bothropic-reference-venom
#11
Iasmim Baptista de Farias, Karen de Morais-Zani, Caroline Serino-Silva, Sávio S Sant'Anna, Marisa M T da Rocha, Kathleen F Grego, Débora Andrade-Silva, Solange M T Serrano, Anita M Tanaka-Azevedo
Snake venom is a variable phenotypic trait, whose plasticity and evolution are critical for effective antivenom production. A significant reduction of the number of snake donations to Butantan Institute (São Paulo, Brazil) occurred in recent years, and this fact may impair the production of the Brazilian Bothropic Reference Venom (BBRV). Nevertheless, in the last decades a high number of Bothrops jararaca specimens have been raised in captivity in the Laboratory of Herpetology of Butantan Institute. Considering these facts, we compared the biochemical and biological profiles of B...
December 21, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/29244815/analysis-of-the-efficacy-of-taiwanese-freeze-dried-neurotoxic-antivenom-against-naja-kaouthia-naja-siamensis-and-ophiophagus-hannah-through-proteomics-and-animal-model-approaches
#12
Chien-Chun Liu, Chen-Hsien You, Po-Jung Wang, Jau-Song Yu, Guo-Jen Huang, Chien-Hsin Liu, Wen-Chin Hsieh, Chih-Chuan Lin
In Southeast Asia, envenoming resulting from cobra snakebites is an important public health issue in many regions, and antivenom therapy is the standard treatment for the snakebite. Because these cobras share a close evolutionary history, the amino acid sequences of major venom components in different snakes are very similar. Therefore, either monovalent or polyvalent antivenoms may offer paraspecific protection against envenomation of humans by several different snakes. In Taiwan, a bivalent antivenom-freeze-dried neurotoxic antivenom (FNAV)-against Bungarus multicinctus and Naja atra is available...
December 15, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29231898/the-venom-of-the-spine-bellied-sea-snake-hydrophis-curtus-proteome-toxin-diversity-and-intraspecific-variation
#13
Vanessa Neale, Javier Sotillo, Jamie E Seymour, David Wilson
The spine-bellied sea snake (Hydrophis curtus) is known to cause human deaths, yet its venom composition has not yet been proteomically characterised. An indepth proteomic analysis was performed on H. curtus venom from two different seasons, January and June, corresponding to adults and subadults, respectively. Venoms from adult and subadult H. curtus individuals were compared using reversedphase high-performance liquid chromatography (RP-HPLC), matrix-assisted laser desorption ionisation-time of flight (MALDI-TOF) mass spectrometry and liquid chromatography electrospray ionisation mass spectrometry (LC-ESI-MS) to detect intraspecific variation, and the molecular weight data obtained with ESIMS were used to assess toxin diversity...
December 12, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29215036/proteomics-and-antivenomics-of-echis-carinatus-carinatus-venom-correlation-with-pharmacological-properties-and-pathophysiology-of-envenomation
#14
Aparup Patra, Bhargab Kalita, Abhishek Chanda, Ashis K Mukherjee
The proteome composition of Echis carinatus carinatus venom (ECV) from India was studied for the first time by tandem mass spectrometry analysis. A total of 90, 47, and 22 distinct enzymatic and non-enzymatic proteins belonging to 15, 10, and 6 snake venom protein families were identified in ECV by searching the ESI-LC-MS/MS data against non-redundant protein databases of Viperidae (taxid 8689), Echis (taxid 8699) and Echis carinatus (taxid 40353), respectively. However, analysis of MS/MS data against the Transcriptome Shotgun Assembly sequences (87 entries) of conger E...
December 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29201102/enzymatic-analysis-of-iranian-echis-carinatus-venom-using-zymography
#15
Mostafa Kamyab, Euikyung Kim, Seyed Mehdi Hoseiny, Ramin Seyedian
Snakebite is a common problem especially in tropical areas all over the world including Iran. Echis carinatus as one of the most dangerous Iranian snakes is spreading in this country excluding central and northwest provinces. In this study gelatinase and fibrinogenolytic properties as two disintegrating matrix metalloproteinase enzymes were evaluated by a strong clear halo between 56-72 kDa in addition to another band located 76-102 kDa for gelatinase and one major band around 38 kDa for fibrinogenolytic enzyme respectively...
2017: Iranian Journal of Pharmaceutical Research: IJPR
https://www.readbyqxmd.com/read/29183746/assessment-of-the-anti-snakebite-properties-of-extracts-of-aniba-fragrans-ducke-lauraceae-used-in-folk-medicine-as-complementary-treatment-in-cases-of-envenomation-by-bothrops-atrox
#16
Valéria Mourão de Moura, Noranathan da Costa Guimarães, Luana Travassos Batista, Luciana A Freitas-de-Sousa, Joanderson de Sousa Martins, Maria Carolina Scheffer de Souza, Patrícia D Oliveira de Almeida, Wuelton Marcelo Monteiro, Ricardo Bezerra de Oliveira, Maria Cristina Dos-Santos, Rosa Helena Veras Mourão
ETHNOPHARMACOLOGICAL RELEVANCE: Extracts of leaves and bark of Aniba fragrans are used as tea (decoction) to treat snakebites in communities in the Brazilian Amazon. The aqueous extract of the leaves of A. fragrans has been proven to be effective against Bothrops venom, but only when pre-incubated with the venom. This study sought to assess the potential of different types of extract of this species to inhibit the biological activities of Bothrops atrox venom (BaV) when used the same way as in folk medicine...
November 25, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/29179990/snakebite-by-micrurus-averyi-schmidt-1939-in-the-brazilian-amazon-basin-case-report-coral-snakebite-by-micrurus-averyi
#17
REVIEW
Iran Mendonça da Silva, Jorge Contreras Bernal, Pedro Ferreira Gonçalves Bisneto, Antônio Magela Tavares, Valéria Mourão de Moura, Claudio S Monteiro-Junior, Rima Raad, Paulo Sergio Bernarde, Jacqueline de Almeida Gonçalves Sachett, Wuelton Marcelo Monteiro
Micrurus snakes, commonly known as coral snakes, are responsible for 0.4% of the snakebites envenomings in Brazil. In this report, we describe a case of envenoming by Micrurus averyi, the black-headed coral snake, recorded in the western Brazilian Amazon. To the best of our knowledge, this is the first published case perpetrated by this species. The major complaint of the patient was an intense local pain and paresthesia. Examination of the bite site revealed edema extending from the left foot up the left leg that was accompanied by erythema involving the foot and distal third of the leg...
November 24, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/29179989/examination-of-biochemical-and-biological-activities-of-bothrops-jararaca-serpentes-viperidae-wied-neuwied-1824-snake-venom-after-up-to-54-years-of-storage
#18
Daniela M Hatakeyama, Karen de Morais-Zani, Caroline Serino-Silva, Kathleen F Grego, Savio S Sant'anna, Wilson Fernandes, Patrícia A E A Aniz, Ricardo J S Torquato, Aparecida S Tanaka, Libia Sanz, Juan J Calvete, Anita M Tanaka-Azevedo
The number of snakes donated to the Brazilian Instituto Butantan has been decreasing in the past 10 years. This circumstance motivated us to compare the properties of five venom pools of Bothrops jararaca snake stored for up to 54 years. Results showed differences among venom pools regarding enzymatic and other biological activities, such as caseinolytic, phospholipase A2, hemorrhagic and coagulant activities, as well as antigenicity. Protein content, reverse-phase chromatographic profile, and immunorecognition by commercial Bothrops antivenom were comparable for all venom pools, although lethality of the most recent preparations was higher...
November 24, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/29170850/carbon-monoxide-inhibits-hemotoxic-activity-of-elapidae-venoms-potential-role-of-heme
#19
Vance G Nielsen, Nathaniel Frank, Ryan W Matika
Envenomation by hemotoxic enzymes continues to be a major cause of morbidity and mortality throughout the world. With regard to treatment, the gold standard to abrogate coagulopathy caused by these venoms is still the administration of antivenom; however, despite antivenom therapy, coagulopathy still occurs and recurs. Of interest, this laboratory has demonstrated in vitro and in vivo that coagulopathy inducing venom derived from snakes of the family Viperidae exposed to carbon monoxide (CO) is inhibited, potentially by an attached heme...
November 23, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/29151420/-clinical-application-of-vsd-negative-pressure-aspiration-and-detoxification-in-severe-snake-bite
#20
Zhipeng Zheng, Gonglei Chen, Wei Liang, Xu Ji, Jing Yin, Meiling Liu, Wentao Chen, Yigang Yu, Wei Chen
OBJECTIVE: To assess the clinical efficacy of vacuum sealing drainage (VSD) in the treatment of mixed poisonous snake bite. METHODS: A prospective study was conducted. Forty-three snake bite patients by mixed poisonous snakes admitted to Department of Emergency of the 175th Hospital of People's Liberation Army from February 2015 to February 2017 were enrolled. All patients were divided into routine treatment group (n = 20) and VSD treatment group (n = 23) according to whether early incision decompression and using the VSD technique...
November 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
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