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https://www.readbyqxmd.com/read/28819275/a-novel-in-vitro-potency-assay-of-antisera-against-thai-naja-kaouthia-based-on-nicotinic-acetylcholine-receptor-binding
#1
Kavi Ratanabanangkoon, Pavinee Simsiriwong, Kritsada Pruksaphon, Kae Yi Tan, Sukanya Eursakun, Choo Hock Tan, Bunkuea Chantrathonkul, Wongsakorn Wongwadhunyoo, Sirida Youngchim, Nget Hong Tan
Snake envenomation is an important medical problem. One of the hurdles in antivenom development is the in vivo assay of antivenom potency which is expensive, gives variable results and kills many animals. We report a novel in vitro assay involving the specific binding of the postsynaptic neurotoxins (PSNTs) of elapid snakes with purified Torpedo californica nicotinic acetylcholine receptor (nAChR). The potency of an antivenom is determined by its antibody ability to bind and neutralize the PSNT, thus preventing it from binding to nAChR...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28803057/cross-reactivity-and-cross-immunomodulation-between-venoms-of-the-snakes-bothrops-asper-crotalus-simus-and-lachesis-stenophrys-and-its-effect-in-the-production-of-polyspecific-antivenom-for-central-america
#2
Cynthia Arroyo, Sergio Solano, Álvaro Segura, María Herrera, Ricardo Estrada, Mauren Villalta, Mariángela Vargas, José María Gutiérrez, Guillermo León
A mixture of the venoms of Bothrops asper, Crotalus simus and Lachesis stenophrys is used as immunogen to produce the polyspecific Central American antivenom (PoliVal-ICP). In this work, we studied the ability of each of these venoms to modulate the antibody response induced by the other two venoms included in the immunization mixture. For that, equine monospecific, bispecific and polyspecific antivenoms were prepared and compared regarding their ability to neutralize the phospholipase A2, coagulant and lethal activities of each venom, and their anti-venom antibodies concentration...
August 9, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28783135/enzymatic-and-pro-inflammatory-activities-of-bothrops-lanceolatus-venom-relevance-for-envenomation
#3
Marie Delafontaine, Isadora Maria Villas-Boas, Laurence Mathieu, Patrice Josset, Joël Blomet, Denise V Tambourgi
Bothrops lanceolatus, commonly named 'Fer-de-Lance', is an endemic snake of the French Caribbean Island of Martinique. Envenomations by B. lanceolatus present clinical aspects characterized by systemic thrombotic syndrome and important local inflammation, involving edema and pain but limited hemorrhage. To investigate mechanisms of venom-induced inflammation, B. lanceolatus venom was characterized, its cross-reactivity with bothropic antivenom explored, its cytotoxicity on human keratinocytes and vascular cells, and the production of cytokines and chemokines were analyzed...
August 7, 2017: Toxins
https://www.readbyqxmd.com/read/28764620/the-australian-snakebite-project-2005-2015-asp-20
#4
MULTICENTER STUDY
Christopher I Johnston, Nicole M Ryan, Colin B Page, Nicholas A Buckley, Simon Ga Brown, Margaret A O'Leary, Geoffrey K Isbister
OBJECTIVE: To describe the epidemiology, treatment and adverse events after snakebite in Australia. DESIGN: Prospective, multicentre study of data on patients with snakebites recruited to the Australian Snakebite Project (2005-2015) and data from the National Coronial Information System. Setting, participants: Patients presenting to Australian hospitals with suspected or confirmed snakebites from July 2005 to June 2015 and consenting to participation. MAIN OUTCOME MEASURES: Demographic data, circumstances of bites, clinical effects of envenoming, results of laboratory investigations and snake venom detection kit (SVDK) testing, antivenom treatment and adverse reactions, time to discharge, deaths...
August 7, 2017: Medical Journal of Australia
https://www.readbyqxmd.com/read/28757215/catch-a-tiger-snake-by-its-tail-differential-toxicity-co-factor-dependence-and-antivenom-efficacy-in-a-procoagulant-clade-of-australian-venomous-snakes
#5
Callum Lister, Kevin Arbuckle, Timothy N W Jackson, Jordan Debono, Christina N Zdenek, Daniel Dashevsky, Nathan Dunstan, Luke Allen, Chris Hay, Brian Bush, Amber Gillett, Bryan G Fry
A paradigm of venom research is adaptive evolution of toxins as part of a predator-prey chemical arms race. This study examined differential co-factor dependence, variations relative to dietary preference, and the impact upon relative neutralisation by antivenom of the procoagulant toxins in the venoms of a clade of Australian snakes. All genera were characterised by venoms rich in factor Xa which act upon endogenous prothrombin. Examination of toxin sequences revealed an extraordinary level of conservation, which indicates that adaptive evolution is not a feature of this toxin type...
July 27, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/28749283/seroprevalence-and-molecular-characterization-of-ferlavirus-in-captive-vipers-of-costa-rica
#6
Cristina Solis, Randall Arguedas, Mario Baldi, Martha Piche, Carlos Jimenez
Ferlaviruses (FV, previously referred to as ophidian paramyxoviruses, OPMV), are enveloped viruses with a negative-strand RNA genome, affecting snakes in captivity worldwide. Infection is characterized by respiratory and nervous clinical signs and carries high mortality rates, but no specific treatment or vaccine is currently available. Costa Rica has 16 species of vipers, found in captivity in collections essential for antivenom production, reintroduction, and public education. FV circulation in these populations was previously unknown, and the risk of introducing the viruses into naïve collections or free-ranging populations exists if the virus's presence is confirmed...
June 2017: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/28748206/the-complementarity-determining-region-sequences-in-igy-antivenom-hypervariable-regions
#7
David Gitirana da Rocha, Jorge Hernandez Fernandez, Claudia Maria Costa de Almeida, Claudia Letícia da Silva, Fabio Carlos Magnoli, Osmair Élder da Silva, Wilmar Dias da Silva
The data presented in this article are related to the research article entitled "Development of IgY antibodies against anti-snake toxins endowed with highly lethal neutralizing activity" (da Rocha et al., 2017) [1]. Complementarity-determining region (CDR) sequences are variable antibody (Ab) sequences that respond with specificity, duration and strength to identify and bind to antigen (Ag) epitopes. B lymphocytes isolated from hens immunized with Bitis arietans (Ba) and anti-Crotalus durissus terrificus (Cdt) venoms and expressing high specificity, affinity and toxicity neutralizing antibody titers were used as DNA sources...
August 2017: Data in Brief
https://www.readbyqxmd.com/read/28726133/iron-protects-porcine-plasma-coagulation-kinetics-from-degradation-by-crotalus-atrox-venom
#8
Christine S Olver, Vance G Nielsen
While the administration of antivenom to treat hemotoxic snake bite injury remains the gold standard of therapy, we have demonstrated that modifying human fibrinogen with iron and carbon monoxide renders it resistant to fibrinogenolytic snake venom enzymes. In order to translate these findings into a possible biometal-based therapy complementary to antivenom administration, a preclinical model that possesses fibrinogen that closely mimics the human molecule in response to iron and carbon monoxide needed to be identified...
July 19, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28708892/cross-recognition-of-a-pit-viper-crotalinae-polyspecific-antivenom-explored-through-high-density-peptide-microarray-epitope-mapping
#9
Mikael Engmark, Bruno Lomonte, José María Gutiérrez, Andreas H Laustsen, Federico De Masi, Mikael R Andersen, Ole Lund
Snakebite antivenom is a 120 years old invention based on polyclonal mixtures of antibodies purified from the blood of hyper-immunized animals. Knowledge on antibody recognition sites (epitopes) on snake venom proteins is limited, but may be used to provide molecular level explanations for antivenom cross-reactivity. In turn, this may help guide antivenom development by elucidating immunological biases in existing antivenoms. In this study, we have identified and characterized linear elements of B-cell epitopes from 870 pit viper venom protein sequences by employing a high-throughput methodology based on custom designed high-density peptide microarrays...
July 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28698056/daboia-vipera-palaestinae-envenomation-in-horses-clinical-and-hematological-signs-risk-factors-for-mortality-and-construction-of-a-novel-severity-scoring-system
#10
Sharon Tirosh-Levy, Reut Solomovich, Judith Comte, Gila A Sutton, Amir Steinman
Daboia palaestinae is the most common venomous snake in Israel and an important cause of envenomations in humans and animals. Although specific antivenom is produced from horses, little documentation exists regarding the characteristics of envenomed horses. This survey was constructed to describe the clinical, hematological and biochemical characteristics of D. palaestinae envenomation in horses, to identify risk factors for fatality and to construct a prognostic snakebite severity scale (SSS) to be used by veterinarians in the field...
July 8, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28694006/neurotoxicity-with-persistent-unilateral-ophthalmoplegia-from-envenoming-by-a-wild-inland-taipan-oxyuranus-microlepidotus-elapidae-in-remote-outback-south-australia
#11
Scott A Weinstein, Evan Everest, Jeremy Purdell-Lewis, Michael Harrison, Fiona Tavender, Sam Alfred, Liz Marrack, Chris Davenport-Klunder, Neralie Wearn, Julian White
INTRODUCTION: A case of life threatening envenoming by a wild specimen of the inland taipan, Oxyuranus microlepidotus, is described. There have been 11 previously well-documented envenomings by O. microlepidotus, but only 2 were inflicted by wild snakes. Envenomed patients have presented predominantly with defibrinating coagulopathy and neurotoxicity. CASE REPORT: The victim was seeking to observe members of an isolated population of this species and was envenomed while attempting to photograph an approximately 1...
July 8, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28691277/crotalus-atrox-venom-exposed-to-carbon-monoxide-has-decreased-fibrinogenolytic-activity-in-vivo-in-rabbits
#12
Vance G Nielsen
Envenomation by haemotoxic enzymes remains a significant source of human morbidity and mortality worldwide, with administration of long-acting or multiple doses of antivenom first-line therapy. However, coagulopathy can still occur and recur. Of interest, it has been recently demonstrated that direct, isolated exposure of snake venom enzymes with fibrinogenolytic activity to carbon monoxide (CO) abrogates venom-mediated loss of coagulation in human plasma. These observations of CO inhibition of venom fibrinogenolytic activity were subsequently repeated in rabbit whole blood...
July 10, 2017: Basic & Clinical Pharmacology & Toxicology
https://www.readbyqxmd.com/read/28688916/venom-proteome-of-the-yellow-lipped-sea-krait-laticauda-colubrina-from-bali-insights-into-subvenomic-diversity-venom-antigenicity-and-cross-neutralization-by-antivenom
#13
Choo Hock Tan, Kin Ying Wong, Kae Yi Tan, Nget Hong Tan
The venom proteome of Laticauda colubrina (Bali, Indonesia) was elucidated by nano-ESI-LCMS/MS of the venom reverse-phase HPLC fractions. Altogether 31 distinct forms of proteins were identified and clustered into three toxin families: three-finger toxin (3FTX, 66.12% of total venom proteins), phospholipase A2 (PLA2, 33.26%) and cysteine-rich secretory protein (CRiSP, 0.05%). The 3FTX were α-neurotoxins (five long neurotoxins, LNTX, 48.87%; two short neurotoxins, SNTX, 16.94%) and a trace amount of two cytotoxins (CTX, 0...
July 5, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28683119/the-socio-economic-burden-of-snakebite-in-sri-lanka
#14
Anuradhani Kasturiratne, Arunasalam Pathmeswaran, A Rajitha Wickremasinghe, Shaluka F Jayamanne, Andrew Dawson, Geoff K Isbister, Hithanadura Janaka de Silva, David G Lalloo
BACKGROUND: Snakebite is a major problem affecting the rural poor in many of the poorest countries in the tropics. However, the scale of the socio-economic burden has rarely been studied. We undertook a comprehensive assessment of the burden in Sri Lanka. METHODS: Data from a representative nation-wide community based household survey were used to estimate the number of bites and deaths nationally, and household and out of pocket costs were derived from household questionnaires...
July 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28674788/the-bold-and-the-beautiful-a-neurotoxicity-comparison-of-new-world-coral-snakes-in-the-micruroides-and-micrurus-genera-and-relative-neutralization-by-antivenom
#15
Daryl C Yang, James Dobson, Chip Cochran, Daniel Dashevsky, Kevin Arbuckle, Melisa Benard, Leslie Boyer, Alejandro Alagón, Iwan Hendrikx, Wayne C Hodgson, Bryan G Fry
Coral snake envenomations are well characterized to be lethally neurotoxic. Despite this, few multispecies, neurotoxicity and antivenom efficacy comparisons have been undertaken and only for the Micrurus genus; Micruroides has remained entirely uninvestigated. As the USA's supplier of antivenom has currently stopped production, alternative sources need to be explored. The Mexican manufacturer Bioclon uses species genetically related to USA species, thus we investigated the efficacy against Micrurus fulvius (eastern coral snake), the main species responsible for lethal envenomations in the USA as well as additional species from the Americas...
July 3, 2017: Neurotoxicity Research
https://www.readbyqxmd.com/read/28657429/safety-profile-of-snake-antivenom-use-in-hong-kong-a-review-of-191-cases-from-2008-to-2015
#16
Rupeng Mong, Vember C H Ng, Man Li Tse
INTRODUCTION: The mainstay of treatment for significant envenoming from snakebites is antivenom. However, there is insufficient data regarding the safety of antivenom used in Hong Kong. We describe the incidence of hypersensitivity reactions from antivenom use and review the frequency and reasons for intensive care unit (ICU) admission. METHODS: The Hong Kong Poisons Information Centre database was reviewed. All patients given snake antivenom between 2008 and 2015 were included...
June 28, 2017: Clinical Toxicology
https://www.readbyqxmd.com/read/28636631/incidence-and-mortality-due-to-snakebite-in-the-americas
#17
Jean-Philippe Chippaux
BACKGROUND: Better knowledge of the epidemiological characteristics of snakebites could help to take measures to improve their management. The incidence and mortality of snakebites in the Americas are most often estimated from medical and scientific literature, which generally lack precision and representativeness. METHODOLOGY/PRINCIPAL FINDINGS: Authors used the notifications of snakebites treated in health centers collected by the Ministries of Health of the American countries to estimate their incidence and mortality...
June 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28627854/swiss-and-tropical-snakebites-the-clinical-management
#18
Laurence Rochat, Gabriel Alcoba
With increasing trips to tropical areas, as well as a high number of venomous snake holders in the country, the frequency of snake bites is likely to increase. Even if in 50 % of cases, the bites do not lead to clinical envenoming, rapid and effective management is essential to successful treatment, which includes supply with the polyvalent or specific antivenom and recognition of the signs and symptoms justifying its administration. We will deal here mainly with local and tropical snake envenoming that Swiss practitioners could encounter in their offices or the emergency rooms and propose scenarios according to the syndromes...
May 3, 2017: Revue Médicale Suisse
https://www.readbyqxmd.com/read/28623383/ethnopharmacological-uses-phytochemistry-biological-activities-and-biotechnological-applications-of-eclipta-prostrata
#19
REVIEW
Ill-Min Chung, Govindasamy Rajakumar, Ji-Hee Lee, Seung-Hyun Kim, Muthu Thiruvengadam
Eclipta prostrata belongs to a family of medicinal plants (Asteraceae) and plays a role in the treatment of several diseases, including infectious hepatitis, snake venom poisoning, gastritis, and respiratory diseases such as a cough and asthma. A number of compounds, including thiophene derivatives, steroids, triterpenes, flavonoids, polyacetylenes, polypeptides, and coumestans, have been isolated from E. prostrata. The plant functional compounds can act as reducing agent in the field of nanoparticle synthesis...
July 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28601268/the-efficacy-of-crotalidae-polyvalent-immune-fab-ovine-antivenom-versus-placebo-plus-optional-rescue%C3%A2-therapy-on-recovery-from-copperhead-snake-envenomation-a-randomized-double-blind-placebo-controlled-clinical-trial
#20
Charles J Gerardo, Eugenia Quackenbush, Brandon Lewis, S Rutherfoord Rose, Spencer Greene, Eric A Toschlog, Nathan P Charlton, Michael E Mullins, Richard Schwartz, David Denning, Kapil Sharma, Kurt Kleinschmidt, Sean P Bush, Samantha Ryan, Maria Gasior, Victoria E Anderson, Eric J Lavonas
STUDY OBJECTIVE: Copperhead snake (Agkistrodon contortrix) envenomation causes limb injury resulting in pain and disability. It is not known whether antivenom administration improves limb function. We determine whether administration of antivenom improves recovery from limb injury in patients envenomated by copperhead snakes. METHODS: From August 2013 through November 2015, we performed a multicenter, randomized, double-blind, placebo-controlled, clinical trial to evaluate the effect of ovine Crotalidae polyvalent immune Fab (ovine) (CroFab; FabAV) antivenom therapy on recovery of limb function in patients with copperhead snake envenomation at 14 days postenvenomation...
August 2017: Annals of Emergency Medicine
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