keyword
MENU ▼
Read by QxMD icon Read
search

Venom

keyword
https://www.readbyqxmd.com/read/28943466/in-vitro-cytotoxicity-of-l-amino-acid-oxidase-from-the-venom-of-crotalus-mitchellii-pyrrhus
#1
Kok Keong Tan, Siok Ghee Ler, Jayantha Gunaratne, Boon Huat Bay, Gopalakrishnakone Ponnampalam
L-amino acid oxidase isolated from Crotalus mitchellii pyrrhus (Cmp-LAAO) exhibited cytotoxicity against LNCaP prostate adenocarcinoma cells. The viability of LNCaP cells decreased in a concentration- and time-dependent manner upon administration of Cmp-LAAO. Cmp-LAAO induced apoptosis as evidenced by AnnexinV/PI staining using flow cytometry. An increase in caspase-9 and caspase-3 activity were also observed. The damaging effect of LAAO appears to be due to its enzymatic activity, that produces hydrogen peroxide which can then induce oxidative stress within the cells...
September 21, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28943445/the-effects-of-cissampelos-pareira-extract-on-envenomation-induced-by-bothropsdiporus-snake-venom
#2
Bárbara Ricciardi Verrastro, Ana Maria Torres, Gabriela Ricciardi, Pamela Teibler, Silvana Maruñak, Chiara Barnaba, Roberto Larcher, Giorgio Nicolini, Eduardo Dellacassa
ETHNOPHARMACOLOGICAL RELEVANCE: Ophidian accidents are a serious public health problem in Argentina; the Bothrops species is responsible for 97% of these accidents, and in particular, B. diporus is responsible for 80% of them. In the northeast of the country (Corrientes Provinces), Cissampelos pareira L. (Menispermaceae) is commonly used against the venom of B. diporus; its use is described in almost all ethnobotanical literature from countries where the plant grows,. AIM OF THE STUDY: In this study, the in vitro and in vivo antivenom activities of C...
September 21, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28941793/complete-de-novo-sequencing-of-antimicrobial-peptides-in-the-venom-of-the-scorpion-isometrus-maculatus
#3
Masahiro Miyashita, Atsushi Kitanaka, Mao Yakio, Yuzo Yamazaki, Yoshiaki Nakagawa, Hisashi Miyagawa
Scorpion venom contains antimicrobial peptides (AMPs) in addition to neurotoxic peptides. Recent extensive transcriptomic analysis of venom glands of various scorpion species dramatically increased the number of identified AMPs. However, identification of peptides from genetic information requires reference sequences of similar peptides, and moreover, it is often difficult to predict post-translational modifications. In this study, we searched for unknown AMPs contained in the Isometrus maculatus scorpion venom based on the structural features, such as the hydrophobic nature and the lack of disulfide bonds, which are commonly observed in the majority of scorpion AMPs...
September 20, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28941737/arthropod-toxins-acting-on-neuronal-potassium-channels
#4
REVIEW
Juana María Jiménez-Vargas, Lourival D Possani, Karen Luna-Ramírez
Arthropod venoms are a rich mixture of biologically active compounds exerting different physiological actions across diverse phyla and affecting multiple organ systems including the central nervous system. Venom compounds can inhibit or activate ion channels, receptors and transporters with high specificity and affinity providing essential insights into ion channel function. In this review, we focus on arthropod toxins (scorpions, spiders, bees and centipedes) acting on neuronal potassium channels. A brief description of the K(+) channels classification and structure is included and a compendium of neuronal K(+) channels and the arthropod toxins that modify them have been listed...
September 20, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28937587/%C3%A2%C2%B5-conotoxins-modulating-sodium-currents-in-pain-perception-and-transmission-a-therapeutic-potential
#5
REVIEW
Elisabetta Tosti, Raffaele Boni, Alessandra Gallo
The Conus genus includes around 500 species of marine mollusks with a peculiar production of venomous peptides known as conotoxins (CTX). Each species is able to produce up to 200 different biological active peptides. Common structure of CTX is the low number of amino acids stabilized by disulfide bridges and post-translational modifications that give rise to different isoforms. µ and µO-CTX are two isoforms that specifically target voltage-gated sodium channels. These, by inducing the entrance of sodium ions in the cell, modulate the neuronal excitability by depolarizing plasma membrane and propagating the action potential...
September 22, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28936851/-research-of-reversal-effect-of-pesv-to-multi-drug-resistance-of-leukemia-stem-cell
#6
Xiang-Dong Yang, Xing-Li Wang, Wen-Hua Yang, Lei Zhao, Tian-Gai Yan
Using the BALB/c mouse multidrug resistance model of leukemia, the effect of peptide extract from scorpion venom (PESV) to the upstream signal factors of P-gp of MDR leukemia stem cells on the mouse tumor block was observed, and the mechanism of PESV to reverse the MDR of LSC was studied. At the same time, the expression of P-gp, MDR1 mRNA and PI3-K, NF-κB were respectively detected through flow cytometry, RT-PCR, Western blot and Elisa, and the mouse liver, spleen were examined via histopathological methods...
December 2016: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28936710/cloning-expression-purification-and-bioactivity-evaluation-of-a-thrombin-like-enzyme-from-deinagkistrodon-acutus-venom-gland-library
#7
An Li, Chuan Zhang, Jie Wang, Junjie Wang, Hailong Jiang, Jianzhong Li, Xingyuan Ma, Wen Zhang, Yiming Lu
OBJECTIVES: To identify a new member of serine proteases from Deinagkistrodon acutus via phage display technique and appraise its biocatalytic activities. RESULTS: A novel thrombin-like enzyme gene was cloned by screening the phage display library of D. acutus venom gland. The gene has a 783 bp ORF encoding 260 amino acids. A recombinant enzyme expression vector was constructed and the fused protein was expressed in Escherichia coli. The protein was purified showing a single band of approx...
September 21, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28933727/venomics-of-remipede-crustaceans-reveals-novel-peptide-diversity-and-illuminates-the-venom-s-biological-role
#8
Björn M von Reumont, Eivind A B Undheim, Robin-Tobias Jauss, Ronald A Jenner
We report the first integrated proteomic and transcriptomic investigation of a crustacean venom. Remipede crustaceans are the venomous sister group of hexapods, and the venom glands of the remipede Xibalbanus tulumensis express a considerably more complex cocktail of proteins and peptides than previously thought. We identified 32 venom protein families, including 13 novel peptide families that we name xibalbins, four of which lack similarities to any known structural class. Our proteomic data confirm the presence in the venom of 19 of the 32 families...
July 26, 2017: Toxins
https://www.readbyqxmd.com/read/28932384/erratum-to-allergen-immunotherapy-for-insect-venom-allergy-protocol-for-a-systematic-review
#9
Sangeeta Dhami, Ulugbek Nurmatov, Eva-Maria Varga, Gunter Sturm, Antonella Muraro, Cezmi A Akdis, Darío Antolín-Amérigo, M Beatrice Bilò, Danijela Bokanovic, Moises A Calderon, Ewa Cichocka-Jarosz, Joanna N G Oude Elberink, Radoslaw Gawlik, Thilo Jakob, Mitja Kosnik, Joanna Lange, Ervin Mingomataj, Dimitris I Mitsias, Holger Mosbech, Oliver Pfaar, Constantinos Pitsios, Valerio Pravettoni, Graham Roberts, Franziska Ruëff, Betül Ayşe Sin, Aziz Sheikh
[This corrects the article DOI: 10.1186/s13601-016-0095-x.].
2017: Clinical and Translational Allergy
https://www.readbyqxmd.com/read/28931737/changes-in-predator-exposure-but-not-in-diet-induce-phenotypic-plasticity-in-scorpion-venom
#10
Alex N Gangur, Michael Smout, Michael J Liddell, Jamie E Seymour, David Wilson, Tobin D Northfield
Animals embedded between trophic levels must simultaneously balance pressures to deter predators and acquire resources. Venomous animals may use venom toxins to mediate both pressures, and thus changes in this balance may alter the composition of venoms. Basic theory suggests that greater exposure to a predator should induce a larger proportion of defensive venom components relative to offensive venom components, while increases in arms races with prey will elicit the reverse. Alternatively, reducing the need for venom expenditure for food acquisition, for example because of an increase in scavenging, may reduce the production of offensive venom components...
September 27, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28927001/a-review-and-database-of-snake-venom-proteomes
#11
REVIEW
Theo Tasoulis, Geoffrey K Isbister
Advances in the last decade combining transcriptomics with established proteomics methods have made possible rapid identification and quantification of protein families in snake venoms. Although over 100 studies have been published, the value of this information is increased when it is collated, allowing rapid assimilation and evaluation of evolutionary trends, geographical variation, and possible medical implications. This review brings together all compositional studies of snake venom proteomes published in the last decade...
September 18, 2017: Toxins
https://www.readbyqxmd.com/read/28924503/biochemical-and-structural-characterization-of-a-novel-arginine-kinase-from-the-spider-polybetes-pythagoricus
#12
Aldana Laino, Alonso A Lopez-Zavala, Karina D Garcia-Orozco, Jesus S Carrasco-Miranda, Marianela Santana, Vivian Stojanoff, Rogerio R Sotelo-Mundo, Carlos Fernando Garcia
Energy buffering systems are key for homeostasis during variations in energy supply. Spiders are the most important predators for insects and therefore key in terrestrial ecosystems. From biomedical interest, spiders are important for their venoms and as a source of potent allergens, such as arginine kinase (AK, EC 2.7.3.3). AK is an enzyme crucial for energy metabolism, keeping the pool of phosphagens in invertebrates, and also an allergen for humans. In this work, we studied AK from the Argentininan spider Polybetes pythagoricus (PpAK), from its complementary DNA to the crystal structure...
2017: PeerJ
https://www.readbyqxmd.com/read/28922871/divergence-of-the-venom-exogene-repertoire-in-two-sister-species-of-turriconus
#13
Qing Li, Neda Barghi, Aiping Lu, Alexander E Fedosov, Pradip K Bandyopadhyay, Arturo O Lluisma, Gisela P Concepcion, Mark Yandell, Baldomero M Olivera, Helena Safavi-Hemami
The genus Conus comprises approximately 700 species of venomous marine cone snails that are highly efficient predators of worms, snails, and fish. In evolutionary terms, cone snails are relatively young with the earliest fossil records occurring in the Lower Eocene, 55 Ma. The rapid radiation of cone snail species has been accompanied by remarkably high rates of toxin diversification. To shed light on the molecular mechanisms that accompany speciation, we investigated the toxin repertoire of two sister species, Conus andremenezi and Conus praecellens, that were until recently considered a single variable species...
September 1, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/28920799/presumptive-pit-viper-envenomation-in-psittacines-in-a-brazilian-zoo
#14
Mathias Dislich, Peter Wohlsein, Anna Sophie Croukamp, Ulrich Neumann
Snake bites represent a serious public health risk in many regions of the globe, especially in tropical areas. Clinical signs and postmortem changes are well described in human and other mammalian species. However, detailed case reports about venomous snake attacks in avian species are limited. This report describes presumptive fatal envenomations in three psittacines caused by pit vipers in a Brazilian zoo. In one case, a Brazilian lancehead (Bothrops moojeni) was captured in the aviary. In all three cases the dermis around the suspected snake bite area exhibited hemorrhages and edema...
September 2017: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/28918605/food-or-threat-wild-capuchin-monkeys-sapajus-libidinosus-as-both-predators-and-prey-of-snakes
#15
Tiago Falótico, Michele P Verderane, Olívia Mendonça-Furtado, Noemi Spagnoletti, Eduardo B Ottoni, Elisabetta Visalberghi, Patrícia Izar
Snakes present a hazard to primates, both as active predators and by defensive envenomation. This risk might have been a selective pressure on the evolution of primate visual and cognitive systems, leading to several behavioral traits present in human and non-human primates, such as the ability to quickly learn to fear snakes. Primates seldom prey on snakes, and humans are one of the few primate species that do. We report here another case, the wild capuchin monkey (Sapajus libidinosus), which preys on snakes...
September 16, 2017: Primates; Journal of Primatology
https://www.readbyqxmd.com/read/28918200/profiling-the-short-linear-non-disulfide-bond-containing-peptidome-from-the-venom-of-the-scorpion-tityus-obscurus
#16
Nathalia Baptista Dias, Bibiana Monson de Souza, Fernando Kamimura Cocchi, Hipócrates M Chalkidis, Valquíria Abrão Coronado Dorce, Mario Sergio Palma
Many scorpion accidents occur in the Brazilian Amazonian region and are frequently caused by Tityus obscurus. Approximately 5% of the crude venom of this species is composed of short linear, non-disulfide-bridged peptides, which have not been intensively investigated. As a consequence, only a few of these peptides have been structurally and functionally characterized to date. In the present paper, the peptide fraction of the venom was subjected to peptide profiling using an LCMS-IT-TOF/MS and MS(n) system. The analysis detected 320 non-disulfide bond-containing peptides (NDBPs), of which twenty-seven had their sequences assigned; among them, thirteen peptides were characterized, constituting novel toxins in T...
September 13, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28917942/in-vivo-and-in-vitro-testing-of-native-%C3%AE-conotoxins-from-the-injected-venom-of-conus-purpurascens
#17
REVIEW
Mickelene F Hoggard, Alena M Rodriguez, Herminsul Cano, Evan Clark, Han-Shen Tae, David J Adams, Tanja A Godenschwege, Frank Marí
α-Conotoxins inhibit nicotinic acetylcholine receptors (nAChRs) and are used as probes to study cholinergic pathways in vertebrates. Model organisms, such as Drosophila melanogaster, express nAChRs in their CNS that are suitable to investigate the neuropharmacology of α-conotoxins in vivo. Here we report the paired nanoinjection of native α-conotoxin PIA and two novel α-conotoxins, PIC and PIC[O7], from the injected venom of Conus purpurascens and electrophysiological recordings of their effects on the giant fiber system (GFS) of D...
September 13, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28917645/anti-fibrinolytic-and-anti-microbial-activities-of-a-serine-protease-inhibitor-from-honeybee-apis-cerana-venom
#18
Jie Yang, Kwang Sik Lee, Bo Yeon Kim, Yong Soo Choi, Hyung Joo Yoon, Jingming Jia, Byung Rae Jin
Bee venom contains a variety of peptide constituents, including low-molecular-weight protease inhibitors. While the putative low-molecular-weight serine protease inhibitor Api m 6 containing a trypsin inhibitor-like cysteine-rich domain was identified from honeybee (Apis mellifera) venom, no anti-fibrinolytic or anti-microbial roles for this inhibitor have been elucidated. In this study, we identified an Asiatic honeybee (A. cerana) venom serine protease inhibitor (AcVSPI) that was shown to act as a microbial serine protease inhibitor and plasmin inhibitor...
September 14, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/28916424/predictors-of-epinephrine-dispensing-and-allergy-follow-up-after-emergency-department-visit-for-anaphylaxis
#19
Megan Motosue, M Fernanda Bellolio, Holly K Van Houten, Nilay D Shah, Ronna L Campbell
BACKGROUND: National guidelines recommend that patients with anaphylaxis be prescribed an epinephrine auto-injector (EAI) and referred to an allergy/immunology (A/I) specialist. OBJECTIVE: To evaluate guideline concordance and identify predictors of EAI dispensing and A/I follow-up in patients with anaphylaxis treated in the emergency department (ED). METHODS: We identified patients seen in the ED for anaphylaxis from 2010 through 2014 from an administrative claims database using an expanded International Classification of Diseases, Ninth Revision, Clinical Modification diagnosis code algorithm...
September 12, 2017: Annals of Allergy, Asthma & Immunology
https://www.readbyqxmd.com/read/28914784/antiallodynic-effects-of-bee-venom-in-an-animal-model-of-complex-regional-pain-syndrome-type-1-crps-i
#20
Sung Hyun Lee, Jae Min Lee, Yun Hong Kim, Jung Hyun Choi, Seung Hwan Jeon, Dong Kyu Kim, Hyeon Do Jeong, You Jung Lee, Hue Jung Park
Neuropathic pain in a chronic post-ischaemic pain (CPIP) model mimics the symptoms of complex regional pain syndrome type I (CRPS I). The administration of bee venom (BV) has been utilized in Eastern medicine to treat chronic inflammatory diseases accompanying pain. However, the analgesic effect of BV in a CPIP model remains unknown. The application of a tight-fitting O-ring around the left ankle for a period of 3 h generated CPIP in C57/Bl6 male adult mice. BV (1 mg/kg ; 1, 2, and 3 times) was administered into the SC layer of the hind paw, and the antiallodynic effects were investigated using the von Frey test and by measuring the expression of neurokinin type 1 (NK-1) receptors in dorsal root ganglia (DRG)...
September 15, 2017: Toxins
keyword
keyword
16523
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"