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https://www.readbyqxmd.com/read/29045429/preclinical-antivenom-efficacy-testing-reveals-potentially-disturbing-deficiencies-of-snakebite-treatment-capability-in-east-africa
#1
Robert A Harrison, George O Oluoch, Stuart Ainsworth, Jaffer Alsolaiss, Fiona Bolton, Ana-Silvia Arias, José-María Gutiérrez, Paul Rowley, Stephen Kalya, Hastings Ozwara, Nicholas R Casewell
BACKGROUND: Antivenom is the treatment of choice for snakebite, which annually kills an estimated 32,000 people in sub-Saharan Africa and leaves approximately 100,000 survivors with permanent physical disabilities that exert a considerable socioeconomic burden. Over the past two decades, the high costs of the most polyspecifically-effective antivenoms have sequentially reduced demand, commercial manufacturing incentives and production volumes that have combined to create a continent-wide vacuum of effective snakebite therapy...
October 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29044929/anticancer-activity-of-vmct1-analogs-against-mcf-7-cells
#2
Cibele Nicolaski Pedron, Gislaine Patricia Andrade, Roseli Hiromi Sato, Marcelo Der Torossian Torres, Giselle Cerchiaro, Anderson Orzari Ribeiro, Vani Xavier Oliveira Junior
Antimicrobial peptides are considered promising drug candidates due to their broad range of activity. VmCT1 (Phe-Leu-Gly-Ala-Leu-Trp-Asn-Val-Ala-Lys-Ser-Val-Phe-NH2 ) is an α-helical antimicrobial peptide that was obtained from the Vaejovis mexicanus smithi scorpion venom. Some of its analogs showed to be as antimicrobial as the wild type and they were designed for understanding the influence of physiochemical parameters on antimicrobial and hemolytic activity. Some cationic antimicrobial peptides exhibit anticancer activity so VmCT1 analogs were tested in order to verify the anticancer activity of this family of peptides...
October 17, 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/29042310/antivenom-against-crotalus-durissus-terrificus-venom-immunochemical-reactivity-and-experimental-neutralizing-capacity
#3
Federico Gastón Baudou, Silvana Litwin, Laura Cecilia Lanari, Rodrigo Daniel Laskowicz, Carlos Fabián Damin, Jean-Philippe Chippaux, Adolfo Rafael de Roodt
The venom of Crotalus durissus terrificus produces a neurotoxic and myotoxic syndrome that can lead to the death. Specific antivenom is the only treatment to neutralize the toxicity of the venom and the precocity in applying the antivenom is crucial for the efficiency of the treatment. We studied the variation of the immunochemical reactivity and neutralizing capacity of the specific antivenom on this venom in pre-incubation and rescue experiments, at different times. ELISA titers increased with longer venom-antivenom incubation times (p < 0...
October 14, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/29042014/effects-of-cathelicidin-derived-peptide-from-reptiles-on-lipopolysaccharide-induced-intestinal-inflammation-in-weaned-piglets
#4
Haiwen Zhang, Bingxi Zhang, Xiaomeng Zhang, Xuemei Wang, Kebang Wu, Qingfeng Guan
Cathelicidins are the largest family of antimicrobial peptides. C-BF, which is short for Cathelicidin-Bungarus Fasciatus, was isolated from snake venom. C-BF was found to be the most potential substitutes for antibiotics. In this study, we analyzed the effects of cathelicidin-derived peptide C-BF, on lipopolysaccharide (LPS)-induced intestinal damage in weaned piglets, to evaluate the therapeutic effect of C-BF on infectious disease of piglets. Twenty-four piglets were randomly assigned into four groups: control, C-BF, LPS, and C-BF+LPS...
October 2017: Veterinary Immunology and Immunopathology
https://www.readbyqxmd.com/read/29040213/importance-of-the-complement-alternative-pathway-in-serum-chemotactic-activity-during-sepsis
#5
Ganqiong Xu, Yan Feng, Dan Li, Qichang Zhou, Wei Chao, Lin Zou
Serum chemotactic activity is important in regulating neutrophil migration. The ability of neutrophils to migrate to infectious site is crucial for host effective pathogen control, but unregulated neutrophil activation can also cause tissue damage. During bacterial sepsis, the complement alternative pathway (AP) is massively activated in blood and tissues and reportedly contributes to sepsis pathogenesis. Complement factor B (FB) is an essential component of the AP activation. However, the impact of FB/AP activation on blood chemotactic activity during bacterial infection is unclear...
October 16, 2017: Shock
https://www.readbyqxmd.com/read/29037876/photobiomodulation-of-local-alterations-induced-by-bthtx-i-a-phospholipase-a2-myotoxin-from-bothrops-jararacussu-snake-venom-in-vivo-and-in-vitro-evaluation
#6
Adriano Silvio Dos Santos, Ludmila Guimarães-Sousa, Maricilia Silva Costa, Luis Fernando Zamuner, Norma Cristina Sousa, Stephen Hyslop, Andreimar M Soares, Maria Cristina Chavantes, José Carlos Cogo, Stella Regina Zamuner
This report describes the effect of photobiomodulation (PBM) on edema formation, leukocyte influx, prostaglandin E2 (PGE2) biosynthesis and cytotoxicity caused by bothropstoxin-I (BthTX-I), a phospholipase A2 (PLA2) homologue isolated from Bothrops jararacussu snake venom. Swiss mice or C2C12 cells were irradiated with low-level laser (LLL) at 685nm wavelength, an energy density of 4.6J/cm(2) and an irradiation time of 13s. To evaluate the effect on edema formation and leukocyte influx, LLL was applied to the site of inoculation 30min and 3h post-injection...
October 13, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29035314/animal-toxins-providing-insights-into-trpv1-activation-mechanism
#7
REVIEW
Matan Geron, Adina Hazan, Avi Priel
Beyond providing evolutionary advantages, venoms offer unique research tools, as they were developed to target functionally important proteins and pathways. As a key pain receptor in the nociceptive pathway, transient receptor potential vanilloid 1 (TRPV1) of the TRP superfamily has been shown to be a target for several toxins, as a way of producing pain to deter predators. Importantly, TRPV1 is involved in thermoregulation, inflammation, and acute nociception. As such, toxins provide tools to understand TRPV1 activation and modulation, a critical step in advancing pain research and the development of novel analgesics...
October 16, 2017: Toxins
https://www.readbyqxmd.com/read/29034186/medicinal-biological-and-phytochemical-properties-of-gentiana-species
#8
REVIEW
Fatemeh Mirzaee, Amirsaeed Hosseini, Hossein Bakhshi Jouybari, Ali Davoodi, Mohammad Azadbakht
Gentiana, a cosmopolitan and important genus of the Gentianaceae family, comprises 400 species distributed among the world. Based on the studies of Iranian traditional medicine texts, there are some promising bioactivities for this genus that is unknown in modern medicine and some of them are still the basis of new remedies. In traditional medicine texts, Gentiana's different exclusive forms of preparations are effective for treatment of some disorders such as menstrual over-bleeding, conjunctivitis, vitiligo, animals venom poisoning, injuries, infected wounds, pain and swelling of liver, spleen, stomach and sprains of muscles...
October 2017: Journal of Traditional and Complementary Medicine
https://www.readbyqxmd.com/read/29030107/ammodytin-l-is-the-main-cardiotoxic-component-of-the-vipera-ammodytes-ammodytes-venom
#9
Svjetlana Karabuva, Boris Lukšić, Ivica Brizić, Zorica Latinović, Adrijana Leonardi, Igor Križaj
Venom of the nose-horned viper (V. a. ammodytes) as also venoms of some related European viperids can induce also cardiotoxic effects in mammals. In this work we demonstrated that the protein in the V. a. ammodytes venom acting on heart is a myotoxic secreted phospholipase A2 analogue ammodytin L (AtnL). In the isolated perfused rat heart AtnL induced significant and irreversible cardiotoxicity characterized by atrioventricular (AV) blockade. This venom protein induced appearance of high levels of creatine kinase, lactate dehydrogenase, aspartate aminotransferase and troponin I in the sinus effluent of the isolated heart, indicative for myocardial damage, which is obviously the primary cause of its cardiotoxic action...
October 10, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/29027956/combined-venom-gland-transcriptomic-and-venom-peptidomic-analysis-of-the-predatory-ant-odontomachus-monticola
#10
Kohei Kazuma, Keiichi Masuko, Katsuhiro Konno, Hidetoshi Inagaki
Ants (hymenoptera: Formicidae) have adapted to many different environments and have become some of the most prolific and successful insects. To date, 13,258 ant species have been reported. They have been classified into 333 genera and 17 subfamilies. Except for a few Formicinae, Dolichoderinae, and members of other subfamilies, most ant species have a sting with venom. The venoms are composed of formic acid, alkaloids, hydrocarbons, amines, peptides, and proteins. Unlike the venoms of other animals such as snakes and spiders, ant venoms have seldom been analyzed comprehensively, and their compositions are not yet completely known...
October 13, 2017: Toxins
https://www.readbyqxmd.com/read/29027927/conotoxins-as-tools-to-understand-the-physiological-function-of-voltage-gated-calcium-cav-channels
#11
REVIEW
David Ramírez, Wendy Gonzalez, Rafael A Fissore, Ingrid Carvacho
Voltage-gated calcium (CaV) channels are widely expressed and are essential for the completion of multiple physiological processes. Close regulation of their activity by specific inhibitors and agonists become fundamental to understand their role in cellular homeostasis as well as in human tissues and organs. CaV channels are divided into two groups depending on the membrane potential required to activate them: High-voltage activated (HVA, CaV1.1-1.4; CaV2.1-2.3) and Low-voltage activated (LVA, CaV3.1-3.3)...
October 13, 2017: Marine Drugs
https://www.readbyqxmd.com/read/29027924/anti-salmonella-activity-modulation-of-mastoparan-v1-a-wasp-venom-toxin-using-protease-inhibitors-and-its-efficient-production-via-an-escherichia-coli-secretion-system
#12
Yeon Jo Ha, Sam Woong Kim, Chae Won Lee, Chang-Hwan Bae, Joo-Hong Yeo, Il-Suk Kim, Sang Wan Gal, Jin Hur, Ho-Kyoung Jung, Min-Ju Kim, Woo Young Bang
A previous study highlighted that mastoparan V1 (MP-V1), a mastoparan from the venom of the social wasp Vespula vulgaris, is a potent antimicrobial peptide against Salmonella infection, which causes enteric diseases. However, there exist some limits for its practical application due to the loss of its activity in an increased bacterial density and the difficulty of its efficient production. In this study, we first modulated successfully the antimicrobial activity of synthetic MP-V1 against an increased Salmonella population using protease inhibitors, and developed an Escherichia coli secretion system efficiently producing active MP-V1...
October 13, 2017: Toxins
https://www.readbyqxmd.com/read/29027122/hi1a-as-a-novel-neuroprotective-agent-for-ischemic-stroke-by-inhibition-of-acid-sensing-ion-channel-1a
#13
Yandong Ren, Chengchong Li, Jinlong Chang, Rui Wang, Yuhua Wang, Xiang-Ping Chu
Strokes are the second-leading cause of death worldwide, and the cellular and molecular mechanisms underlying stroke-induced brain damage are still uncertain. The present therapy for acute ischemic stroke is limited to thrombolysis with the recombinant tissue plasminogen activator (rtPA). However, rtPA has a narrow therapeutic timeframe of 3-4.5 h, and only approximately 5% of stroke patients can benefit from rtPA treatment. Neuroprotective agents, such as N-methyl-D-aspartate receptor antagonists, have shown great promise in preclinical studies...
October 13, 2017: Translational Stroke Research
https://www.readbyqxmd.com/read/29026428/evaluation-of-the-physiological-activity-of-venom-from-the-eurasian-water-shrew-neomys-fodiens
#14
Krzysztof Kowalski, Paweł Marciniak, Grzegorz Rosiński, Leszek Rychlik
BACKGROUND: Animal toxins can have medical and therapeutic applications. Principally, toxins produced by insects, arachnids, snakes and frogs have been characterized. Venomous mammals are rare, and their venoms have not been comprehensively investigated. Among shrews, only the venom of Blarina brevicauda has been analysed so far, and blarina toxin has been proven to be its main toxic component. It is assumed that Neomys fodiens employs its venom to hunt larger prey. However, the toxic profile, properties and mode of action of its venom are largely unknown...
2017: Frontiers in Zoology
https://www.readbyqxmd.com/read/29024773/an-improved-technique-for-the-assessment-of-venom-induced-haemorrhage-in-a-murine-model
#15
Timothy P Jenkins, Andrés Sánchez, Álvaro Segura, Mariángela Vargas, María Herrera, Trenton K Stewart, Guillermo León, José María Gutiérrez
Haemorrhage is a common clinical manifestation in envenomings caused by bites from snakes of the family Viperidae. Therefore, knowing the haemorrhagic potential of venoms and the capacity of antivenoms to neutralise this effect are of paramount relevance in toxinology. The most widely used method for quantifying haemorrhage involves the intradermal injection of venom (or a mixture of venom/antivenom) in mice, and the assessment of the resulting haemorrhagic area in the inner side of the skin. Although this method allows a straightforward assessment of the haemorrhagic activity of a venom, it does not account for haemorrhagic lesions having a similar area but differing in the depth and intensity of haemorrhage...
October 9, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/29024771/development-of-dot-elisa-for-the-detection-of-venoms-of-major-indian-venomous-snakes
#16
Innus K Shaikh, Prashant P Dixit, Balasaheb S Pawade, Indrasen G Waykar
India remained an epicenter for the snakebite-related mortality and morbidities due to widespread agricultural activities across the country and a considerable number of snakebites offended by Indian cobra (Naja naja), common krait (Bungarus caeruleus), Russell's viper (Daboia russelii), and saw-scaled viper (Echis carinatus). Presently, there is no selective test available for the detection of snake envenomation in India before the administration of snake antivenin. Therefore, the present study aimed to develop rapid, sensitive assay for the management of snakebite, which can detect venom, responsible snake species and serve as a tool for the reasonable administration of snake antivenin, which have scarcity across the world...
October 9, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/29024770/biochemical-biological-and-molecular-characterization-of-an-l-amino-acid-oxidase-laao-purified-from-bothrops-pictus-peruvian-snake-venom
#17
Fanny Lazo, Dan E Vivas-Ruiz, Gustavo A Sandoval, Edith F Rodríguez, Edgar E G Kozlova, F Costal-Oliveira, Carlos Chávez-Olórtegui, Ruperto Severino, Armando Yarlequé, Eladio F Sanchez
An L-amino acid oxidase from Peruvian Bothrops pictus (Bpic-LAAO) snake venom was purified using a combination of size-exclusion and ion-exchange chromatography. Bpic-LAAO is a homodimeric glycosylated flavoprotein with molecular mass of ∼65 kDa under reducing conditions and ∼132 kDa in its native form as analyzed by SDS-PAGE and gel filtration chromatography, respectively. N-terminal amino acid sequencing showed highly conserved residues in a glutamine-rich motif related to binding substrate. The enzyme exhibited optimal activity towards L-Leu at pH 8...
October 9, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/29024043/proteomic-analysis-of-the-venom-of-the-predatory-ant-pachycondyla-striata-hymenoptera-formicidae
#18
Pollyanna Pereira Santos, Patricia Dias Games, Dihego Oliveira Azevedo, Edvaldo Barros, Leandro Licursi de Oliveira, Humberto Josué de Oliveira Ramos, Maria Cristina Baracat-Pereira, José Eduardo Serrão
The ants use their venom for predation, defense, and communication. The venom of these insects is rich in peptides and proteins, and compared with other animal venoms, ant venoms remain poorly explored. The objective of this study was to evaluate the protein content of the venom in the Ponerinae ant Pachycondyla striata. Venom samples were collected by manual gland reservoir dissection, and samples were submitted to two-dimensional gel electrophoresis and separation by ion-exchange and reverse-phase high-performance liquid chromatography followed by mass spectrometry using tanden matrix-assisted laser desorption/ionization with time-of-flight (MALDI-TOF/TOF) mass spectrometry and electrospray ionization-quadrupole with time-of-flight (ESI-Q/TOF) mass spectrometry for obtaining amino acid sequence...
October 10, 2017: Archives of Insect Biochemistry and Physiology
https://www.readbyqxmd.com/read/29023569/pancreatic-and-snake-venom-presynaptically-active-phospholipases-a2-inhibit-nicotinic-acetylcholine-receptors
#19
Catherine A Vulfius, Igor E Kasheverov, Elena V Kryukova, Ekaterina N Spirova, Irina V Shelukhina, Vladislav G Starkov, Tatyana V Andreeva, Grazyna Faure, Marios Zouridakis, Victor I Tsetlin, Yuri N Utkin
Phospholipases A2 (PLA2s) are enzymes found throughout the animal kingdom. They hydrolyze phospholipids in the sn-2 position producing lysophospholipids and unsaturated fatty acids, agents that can damage membranes. PLA2s from snake venoms have numerous toxic effects, not all of which can be explained by phospholipid hydrolysis, and each enzyme has a specific effect. We have earlier demonstrated the capability of several snake venom PLA2s with different enzymatic, cytotoxic, anticoagulant and antiproliferative properties, to decrease acetylcholine-induced currents in Lymnaea stagnalis neurons, and to compete with α-bungarotoxin for binding to nicotinic acetylcholine receptors (nAChRs) and acetylcholine binding protein...
2017: PloS One
https://www.readbyqxmd.com/read/29023124/synthesis-and-antimicrobial-evaluation-of-fire-ant-venom-alkaloid-based-2-methyl-6-alkyl-%C3%AE-1-6-piperideines
#20
Yujie Yan, Yu An, Xiaozhong Wang, Yingqi Chen, Melissa R Jacob, Babu L Tekwani, Liyan Dai, Xing-Cong Li
The first synthesis of 2-methyl-6-pentadecyl-Δ(1,6)-piperideine (1), a major alkaloid of the piperideine chemotype in fire ant venoms, and its analogues, 2-methyl-6-tetradecyl-Δ(1,6)-piperideine (2) and 2-methyl-6-hexadecyl-Δ(1,6)-piperideine (3), was achieved by a facile synthetic method starting with glutaric acid (4) and urea (5). Compound 1 showed in vitro antifungal activity against Cryptococcus neoformans and Candida albicans with IC50 values of 6.6 and 12.4 μg/mL, respectively, and antibacterial activity against vancomycin-resistant Enterococcus faecium with an IC50 value of 19...
October 12, 2017: Journal of Natural Products
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