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Toxins

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https://www.readbyqxmd.com/read/29793158/botulinum-toxin-type-a-affects-mechanics-of-non-injected-antagonistic-rat-muscles
#1
Filiz Ateş, Can A Yucesoy
Botulinum toxin type A (BTX-A) effects on the mechanics of non-injected antagonistic muscles are unknown. The aim was to test the following hypotheses in a rat model: BTX-A injected into gastrocnemius medialis (GM) and lateralis (GL) (1) decreases forces of the antagonistic tibialis anterior (TA) and extensor digitorum longus (EDL), (2) reduces length range of force exertion and (3) increases passive forces of the TA, and (4) changes inter-antagonistic and inter-synergistic epimuscular myofascial force transmission (EMFT)...
May 17, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29792566/clues-to-an-evolutionary-mystery-the-genes-for-t-toxin-enabler-of-the-devastating-1970-southern-corn-leaf-blight-epidemic-are-present-in-ancestral-species-suggesting-an-ancient-origin
#2
Bradford J Condon, Candace E Elliott, Jonathan Gonzalez, Sung-Hwan Yun, Yasunori Akagi, Tyr Wiesner-Hanks, Motoichiro Kodama, Gillian Turgeon
The Southern Corn Leaf Blight epidemic of 1970 devastated fields of T-cytoplasm corn planted in monoculture throughout the eastern US. The epidemic was driven by race T, a previously unseen race of Cochliobolus heterostrophus. A second fungus, Phyllosticta zeae-maydis, with the same biological specificity, appeared coincidentally. Race T produces T-toxin, while P. zeae-maydis produces PM-toxin, both host selective polyketide toxins necessary for supervirulence. Present abundance of genome sequences offers an opportunity to tackle the evolutionary origins of T- and PM- toxin biosynthetic genes, previously thought unique to these species...
May 24, 2018: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/29792531/the-expression-of-lysophosphatidic-acid-receptor-5-is-necessary-for-the-regulation-of-intestinal-na-h-exchanger-3-by-lysophosphatidic-acid-in-vivo
#3
Kayte A Jenkin, Peijian He, C Chris Yun
Lysophosphatidic acid (LPA) is a bioactive lipid molecule, which regulates a broad range of pathophysiological processes. Recent studies have demonstrated that LPA modulates electrolyte flux in the intestine and its potential as an anti-diarrheal agent has been suggested. Of six LPA receptors, LPA5 is highly expressed in the intestine. Recent studies by our group have demonstrated activation of Na+ /H+ exchanger 3 (NHE3) by LPA5 . However, much of what has been elucidated was achieved using colonic cell lines that were transfected to express LPA5 ...
May 24, 2018: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29791446/nitrogen-limitation-toxin-synthesis-potential-and-toxicity-of-cyanobacterial-populations-in-lake-okeechobee-and-the-st-lucie-river-estuary-florida-during-the-2016-state-of-emergency-event
#4
Benjamin J Kramer, Timothy W Davis, Kevin A Meyer, Barry H Rosen, Jennifer A Goleski, Gregory J Dick, Genesok Oh, Christopher J Gobler
Lake Okeechobee, FL, USA, has been subjected to intensifying cyanobacterial blooms that can spread to the adjacent St. Lucie River and Estuary via natural and anthropogenically-induced flooding events. In July 2016, a large, toxic cyanobacterial bloom occurred in Lake Okeechobee and throughout the St. Lucie River and Estuary, leading Florida to declare a state of emergency. This study reports on measurements and nutrient amendment experiments performed in this freshwater-estuarine ecosystem (salinity 0-25 PSU) during and after the bloom...
2018: PloS One
https://www.readbyqxmd.com/read/29790756/studies-on-aculeines-synthetic-strategy-to-the-fully-protected-protoaculeine-b-the-n-terminal-amino-acid-of-aculeine-b
#5
Hiroki Shiozaki, Masayoshi Miyahara, Kazunori Otsuka, Kei Miyako, Akito Honda, Yuichi Takasaki, Satoshi Takamizawa, Hideyuki Tukada, Yuichi Ishikawa, Ryuichi Sakai, Masato Oikawa
A synthetic strategy for accessing protoaculeine B (1), the N-terminal amino acid of the highly modified peptide toxin aculeine, was developed via the synthesis of the fully protected natural homologue of 1 with a 12-mer poly(propanediamine). The synthesis of mono(propanediamine) analog 2, as well as core amino acid 3, was demonstrated by this strategy. New amino acid 3 induced convulsions in mice; however, compound 2 showed no such activity.
May 23, 2018: Organic Letters
https://www.readbyqxmd.com/read/29790569/-laryngeal-dystonia-novel-forms-of-therapeutic-administration-of-botulinum-toxin-by-direct-routes
#6
L J Lopez Del Val, J M Sebastian-Cortes, E Bellosta-Diago, S Santos-Lasaosa, P R Vinueza-Buitron, Y Lois-Ortega, H Valles-Varea, E Lopez-Garcia
AIM: To describe our experience in the treatment of laryngeal dystonia (in abduction and adduction), with special emphasis given to the technical aspects (approach procedure, dosage and type of botulinum toxin type A used), as well as treatment response and possible side effects. PATIENTS AND METHODS: We conducted a cross-sectional descriptive study of a sample of patients with laryngeal dystonia treated by means of transoral administration of onabotulinumtoxinA or incobotulinumtoxinA over a period of 10 years (2007-2017)...
June 1, 2018: Revista de Neurologia
https://www.readbyqxmd.com/read/29790392/interleukin-1-receptor-il-1r1-activation-exacerbates-toxin-induced-acute-kidney-injury
#7
Jamie R Privratsky, Jiandong Zhang, Xiaohan Lu, Nathan Rudemiller, Qingqing Wei, Yen-Rei Yu, Michael Dee Gunn, Steven D Crowley
Acute kidney injury (AKI) is a leading cause of morbidity and mortality. Cisplatin is an effective chemotherapeutic agent whose administration is limited by nephrotoxicity. Therapies to prevent cisplatin-induced AKI are lacking. While tumor necrosis factor-α (TNF) plays a key role in the pathogenesis of cisplatin nephrotoxicity, the immune signaling pathways that trigger TNF generation in this context require elucidation. Sterile injury triggers the release and activation of both isoforms of interleukin(IL)-1, IL-1α and IL-1β, and stimulation of the interleukin-1 receptor (IL-1R1) by these ligands engages a pro-inflammatory signaling cascade that induces TNF induction...
May 23, 2018: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29789138/introduction-to-primary-hemifacial-spasm-a-neurosurgical-disease
#8
P Mercier, M Sindou
Primary hemifacial spasm is a hyperactive cranial nerve syndrome. The cause is always a neurovascular compression, generally at the root exit zone from the brainstem. Its curative treatment is microvascular compression, that may be performed as a first option, or secondarily when botulinum toxin injections fail.
May 19, 2018: Neuro-Chirurgie
https://www.readbyqxmd.com/read/29789035/the-effect-of-transportation-and-lairage-on-faecal-shedding-and-carcass-contamination-with-escherichia-coli-o157-and-o26-in-very-young-calves-in-new-zealand
#9
P Jaros, A L Cookson, A Reynolds, H Withers, R Clemens, G Brightwell, J Mills, J Marshall, D J Prattley, D M Campbell, S Hathaway, N P French
The effect of transportation and lairage on the faecal shedding and post-slaughter contamination of carcasses with Escherichia coli O157 and O26 in young calves (4-7-day-old) was assessed in a cohort study at a regional calf-processing plant in the North Island of New Zealand, following 60 calves as cohorts from six dairy farms to slaughter. Multiple samples from each animal at pre-slaughter (recto-anal mucosal swab) and carcass at post-slaughter (sponge swab) were collected and screened using real-time PCR and culture isolation methods for the presence of E...
May 23, 2018: Epidemiology and Infection
https://www.readbyqxmd.com/read/29788418/efficacy-of-bezlotoxumab-based-on-timing-of-administration-relative-to-start-of-antibacterial-therapy-for-clostridium-difficile-infection
#10
Thomas Birch, Yoav Golan, Giuliano Rizzardini, Erin Jensen, Lori Gabryelski, Dalya Guris, Mary Beth Dorr
Background: The fully human monoclonal antibody bezlotoxumab binds Clostridioides (Clostridium) difficile toxin B and reduces recurrence rates in patients with C. difficile infection (CDI) receiving antibacterial treatment for a primary or recurrent episode. Objectives: To investigate whether the timing of bezlotoxumab administration relative to the onset of antibacterial treatment affected clinical outcome in the Phase 3 trials MODIFY I (NCT01241552) and MODIFY II (NCT01513239)...
May 16, 2018: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29788296/comparison-of-c-difficile-stool-toxin-concentrations-in-adults-with-symptomatic-infection-and-asymptomatic-carriage-using-an-ultrasensitive-quantitative-immunoassay
#11
Nira R Pollock, Alice Banz, Xinhua Chen, David Williams, Hua Xu, Christine A Cuddemi, Alice X Cui, Matthew Perrotta, Eaman Alhassan, Brigitte Riou, Aude Lantz, Mark A Miller, Ciaran P Kelly
Background: We used an ultrasensitive, quantitative Single Molecule Array (Simoa) immunoassay to test whether concentrations of C. difficile toxins A and/or B in the stool of adult inpatients with CDI were higher than in asymptomatic carriers of toxinogenic C. difficile. Methods: Patients enrolled as CDI-NAAT had clinically significant diarrhea and positive nucleic acid amplification testing (NAAT), per US guidelines, and received CDI treatment. Potential carriers had recently received antibiotics and did not have diarrhea; positive NAAT confirmed carriage...
May 17, 2018: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29788125/toxin-antitoxin-systems-and-regulatory-mechanisms-in-mycobacterium-tuberculosis
#12
Richard A Slayden, Clinton C Dawson, Jason E Cummings
There has been a significant reduction in annual tuberculosis incidence since the World Health Organization declared tuberculosis a global health threat. However, treatment of M. tuberculosis infections requires lengthy multidrug therapeutic regimens to achieve a durable cure. The development of new drugs that are active against resistant strains and phenotypically diverse organisms continues to present the greatest challenge in the future. Numerous phylogenomic analyses have revealed that the Mtb genome encodes a significantly expanded repertoire of toxin-antitoxin (TA) loci that makes up the Mtb TA system...
June 1, 2018: Pathogens and Disease
https://www.readbyqxmd.com/read/29787842/mesotherapy-with-botulinum-toxin-for-the-treatment-of-refractory-vascular-and-papulopustular-rosacea
#13
Jyotirmay Bharti, Sidharth Sonthalia, Deepak Jakhar
No abstract text is available yet for this article.
May 19, 2018: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/29787779/stichodactyla-helianthus-de-novo-transcriptome-assembly-discovery-of-a-new-actinoporin-isoform
#14
Esperanza Rivera-de-Torre, Álvaro Martínez-Del-Pozo, Jessica E Garb
Transcriptomic profiling of venom producing tissues from different animals is an effective approach for discovering new toxins useful in biotechnological and pharmaceutical applications, as well in evolutionary comparative studies of venomous animals. Stichodactyla helianthus is a Caribbean sea anemone which produces actinoporins as part of its toxic venom. This family of pore forming toxins is multigenic and at least two different isoforms, encoded by separate genes, are produced by S. helianthus. These isoforms, sticholysins I and II, share 93% amino acid identity but differ in their pore forming activity and act synergistically...
May 19, 2018: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/29787730/plant-pathogen-warfare-under-changing-climate-conditions
#15
REVIEW
André C Velásquez, Christian Danve M Castroverde, Sheng Yang He
Global environmental changes caused by natural and human activities have accelerated in the past 200 years. The increase in greenhouse gases is predicted to continue to raise global temperature and change water availability in the 21st century. In this Review, we explore the profound effect the environment has on plant diseases - a susceptible host will not be infected by a virulent pathogen if the environmental conditions are not conducive for disease. The change in CO2 concentrations, temperature, and water availability can have positive, neutral, or negative effects on disease development, as each disease may respond differently to these variations...
May 21, 2018: Current Biology: CB
https://www.readbyqxmd.com/read/29786953/iatrogenic-botulism-outbreak-in-egypt-due-to-a-counterfeit-botulinum-toxin-a-preparation-a-descriptive-series-of-patient-features-and-outcome
#16
Eman Abdel Monaem Abdel Rashid, Nashwa Mohamed El-Mahdy, Huda Shehata Kharoub, Ahmed Salah Gouda, Naglaa Ahmed ElNabarawy, Bruno Mégarbane
Iatrogenic botulism resulting from the substantial increase in use of botulinum neurotoxin type-A (BoNT-A) treatment is rarely reported. We aimed to describe a large iatrogenic botulism outbreak in Egypt in June-July 2017. Nine patients developed botulism after receiving intramuscular injections of BoNT-A (dose: 200-300 IU) to treat cerebral palsy (N=7), spastic dystonia (N=1), and hyperhidrosis (N=1). Detailed findings were available in 5/9 cases. Patients were admitted to the hospital 5-10 days after the BoNT-A injection...
May 22, 2018: Basic & Clinical Pharmacology & Toxicology
https://www.readbyqxmd.com/read/29786671/mechanisms-of-action-and-cell-death-associated-with-clostridium-perfringens-toxins
#17
REVIEW
Mauricio A Navarro, Bruce A McClane, Francisco A Uzal
Clostridium perfringens uses its large arsenal of protein toxins to produce histotoxic, neurologic and intestinal infections in humans and animals. The major toxins involved in diseases are alpha (CPA), beta (CPB), epsilon (ETX), iota (ITX), enterotoxin (CPE), and necrotic B-like (NetB) toxins. CPA is the main virulence factor involved in gas gangrene in humans, whereas its role in animal diseases is limited and controversial. CPB is responsible for necrotizing enteritis and enterotoxemia, mostly in neonatal individuals of many animal species, including humans...
May 22, 2018: Toxins
https://www.readbyqxmd.com/read/29785923/cholera-outbreak-due-to-raw-seafood-consumption-in-south-korea-2016
#18
Jeong Hyun Kim, Jin Lee, Sahyun Hong, Sangwon Lee, Hae-Young Na, Young-Il Jeong, Eun Jin Choi, Junyoung Kim, Hyo Sun Kawk, Enhi Cho
Three cases of cholera occurred in South Korea during a period of three weeks in August 2016. All the cases were associated with the consumption of raw seafood in southern coastal area of South Korea. Epidemiologic investigations were performed to track the spread of cholera, including persons in contact with the cholera patients, seafood, and seawater from the fish tank and marine environments. A microbiological investigation demonstrated that cholera isolated from the three patients and a seawater sample at the Korea Strait showed identical serotype (O1 Ogawa), biotype (El tor), and toxin ( ctx -positive)...
May 21, 2018: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29785814/botulinum-toxin-type-a-for-wrinkles-the-least-interesting-use-of-this-versatile-protein
#19
D M Ozog
No abstract text is available yet for this article.
May 2018: British Journal of Dermatology
https://www.readbyqxmd.com/read/29785701/botulin-toxin-injection-to-improve-the-results-of-sphincter-overlap-in-high-grade-obstetric-anal-sphincter-injury-syndrome
#20
N Falco, L Pisegna Cerone, R Bellomo, A Infantino
No abstract text is available yet for this article.
May 21, 2018: Techniques in Coloproctology
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