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Organophosphates poisoning

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https://www.readbyqxmd.com/read/29143438/protective-effects-of-coenzyme-q10-nanoparticles-on-dichlorvos-induced-hepatotoxicity-and-mitochondrial-lysosomal-injury
#1
Aziz Eftekhari, Elham Ahmadian, Aida Azami, Mohammad Johari-Ahar, Mohammad Ali Eghbal
Development of biocompatible antioxidant nanoparticles for xenobiotic-induced liver disease treatment by oral or parenteral administration is of great interest in medicine. In the current study, we demonstrate the protective effects of coenzyme Q10 nanoparticles (CoQ10-NPs) on hepatotoxicity induced by dichlorvos (DDVP) as an organophosphate. Although CoQ10 is an efficient antioxidant, its poor bioavailability has limited the applications of this useful agent. First, CoQ10-NPs were prepared then characterized using dynamic light scattering (DLS) and transmission electron microscopy (TEM)...
November 16, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/29143350/dna-variants-and-organophosphate-neurotoxicity-among-emerging-farmers-in-the-western-cape-of-south-africa
#2
Tracy Glass, Mohamed A Dalvie, Zelda Holtman, Anna A Vorster, Rajkumar S Ramesar, Leslie London
BACKGROUND: Previous epidemiological studies investigating modification of organophosphate (OP) neurotoxicity by xenobiotic metabolizing enzymes (XMEs) polymorphisms have produced inconsistent results. METHODS: A cross-sectional study of 301 emerging farmers was conducted. Neurotoxicity testing included forward and backward recall, digit span, and vibration sensitivity testing. Questionnaire data included demography, potential confounders, and work history of pesticide exposures...
November 16, 2017: American Journal of Industrial Medicine
https://www.readbyqxmd.com/read/29142799/respiratory-failure-following-organophosphate-poisoning-a-literature-review
#3
REVIEW
Pirthvi Raj Giyanwani, Ujala Zubair, Osama Salam, Zarafshan Zubair
Organophosphates (OPs) account for a large portion of suicides globally. OP manifests as cholinergic crises, which underlie respiratory failure. There are many pathways by which respiration is inhibited secondary to organophosphate poisoning. These include central as well as peripheral mechanisms, with central mechanisms predominating. We conducted a literature review in June 2017. PubMed, Embase, and Google Scholar were searched for studies that reported acute organophosphate poisoning in humans. In our review, data were collected from studies published during the years 2001 to 2016...
September 3, 2017: Curēus
https://www.readbyqxmd.com/read/29141517/protective-effects-of-dietary-omega-3-fatty-acid-supplementation-on-organophosphate-poisoning
#4
Bahattin Avci, S Sirri Bilge, Gokhan Arslan, Omer Alici, Ozge Darakci, Turkhan Baratzada, Engin Ciftcioglu, Turker Yardan, Ayhan Bozkurt
In this study, we aimed to study the possible preventive effect of docosahexaenoic acid (DHA), a dietary omega-3 fatty acid, on toxicity caused by chlorpyrifos (CPF). Six groups of Sprague Dawley rats (200-250 g) consisting of equal numbers of males and females (n = 8) were assigned to study. The rats were orally given for 5 days. The control group was administered pure olive oil, which was the vehicle for CPF. The CPF challenge groups were administered oral physiological saline, pure olive oil, or DHA (50, 100 and 400 mg/kg dosages) for 5 days...
January 1, 2017: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/29129799/post-exposure-treatment-with-the-oxime-rs194b-rapidly-reactivates-and-reverses-advanced-symptoms-of-lethal-inhaled-paraoxon-in-macaques
#5
Yvonne J Rosenberg, Jerry Wang, Tara Ooms, Narayanan Rajendran, Lingjun Mao, Xiaoming Jiang, Jonathan Lees, Lori Urban, Jeremiah Romper, Yadire Sepulveda, Yan-Jye Shyong, Palmer Taylor
Fatalities from organophosphate (OP) insecticide result from both occupational and deliberate exposure; significantly impacting human health. Like nerve agents, insecticides are neurotoxins which target and inhibit acetylcholinesterases (AChE) in central and peripheral synapses in the cholinergic nervous system. Post-exposure therapeutic countermeasures generally include administration of atropine with a pyridinium aldoximes e.g. pralidoxime, to reactivate the OP-inhibited AChE. However, commonly used oximes inefficiently cross the blood brain barrier and are rapidly cleared and their benefit is debated...
November 9, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/29115090/urine-methyl-hippuric-acid-levels-in-acute-pesticide-poisoning-estimation-of-ingested-xylene-volume-and-association-with-clinical-outcome-parameters
#6
Chi Young Choi, NamJun Cho, Su Yeon Park, Samel Park, Hyo Wook Gil, Sae Yong Hong
To determine the relationship between the oral ingestion volume of xylene and methyl hippuric acid (MHA) in urine, we measured MHA in 11 patients whose ingested xylene volume was identified. The best-fit equation between urine MHA and ingested amount of xylene was as follows: y (ingested amount of xylene, mL/kg) = -0.052x² + 0.756x (x = MHA in urine in g/g creatinine). From this equation, we estimated the ingested xylene volume in 194 patients who had ingested pesticide of which the formulation was not available...
December 2017: Journal of Korean Medical Science
https://www.readbyqxmd.com/read/29097283/biomolecular-engineering-of-biocatalysts-hydrolyzing-neurotoxic-organophosphates
#7
Ilya V Lyagin, Elena N Efremenko
Novel methods of molecular modeling help solving urgent problems in drug design, directed evolution of biocatalysts and biosensors, and a lot of other research fields. Implementation of such methods to organophosphorus hydrolase being perfect research object that hydrolyzes dangerous neurotoxic organophosphates could intensify development of antidote and protective preparations to treat poisoning. Structures of enzyme-polyelectrolyte complexes (EPCs) based on hexahistidine-tagged organophosphorus hydrolase (His6-OPH) with different biopolymers (various modifications of polyglutamic and polyaspartic acid, as well as hydroxyethyl starch and succinylated gelatin) were simulated at different pH using molecular docking...
October 30, 2017: Biochimie
https://www.readbyqxmd.com/read/29097222/searching-for-putative-binding-sites-of-the-bispyridinium-compound-mb327-in-the-nicotinic-acetylcholine-receptor
#8
Thomas Wein, Georg Höfner, Sebastian Rappenglück, Sonja Sichler, Karin V Niessen, Thomas Seeger, Franz Worek, Horst Thiermann, Klaus T Wanner
Irreversible inhibition of the acetylcholine esterase upon intoxication with organophosphorus compounds leads to an accumulation of acetylcholine in the synaptic cleft and a subsequent desensitization of nicotinic acetylcholine receptors which may ultimately result in respiratory failure. The bispyridinium compound MB327 has been found to restore functional activity of nAChR thus representing a promising starting point for the development of new drugs for the treatment of organophosphate poisoning. In order to optimize the resensitizing effect of MB327 on nAChR, it would be very helpful to know the MB327 specific binding site to apply structure based molecular modeling...
October 30, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/29062551/in-vitro-cysteine-reactivates-organophosphate-insecticide-dichlorvos-inhibited-human-cholinesterases
#9
Hamidreza Mohammadi, Jafar Jalilian, Mohammad Y Karimi, Seyed V Shetab-Boushehri
OBJECTIVES: Organophosphate (OP) pesticides inhibit both red blood cell (RBC) and plasma cholinesterases (ChEs). Oximes, especially pralidoxime (2-PAM), are widely used as antidotes to treat OP poisoning. In addition, N-acetylcysteine (NAC) is sometimes used as an adjuvant antidote. The current study aimed to assess the feasibility of using NAC as a single therapeutic agent for OP poisoning in comparison to in vitro 2-PAM. METHODS: This study was carried out at the Razi Drug Research Center of Iran University of Medical Sciences, Tehran, Iran, between April and September 2014...
August 2017: Sultan Qaboos University Medical Journal
https://www.readbyqxmd.com/read/29027213/protective-effect-of-metoclopramide-against-organophosphate-induced-apoptosis-in-the-murine-skin-fibroblast-l929
#10
Basem M Jaber, Georg A Petroianu, Syed A Rizvi, Anwar Borai, Nada A Saleh, Sharif M Hala, Ayman M Saleh
This study was performed to evaluate the protective efficacy of metoclopramide (MCP) against the organophosphates paraoxon (POX)- and malathion (MLT)-induced apoptosis in the murine L929 skin fibroblasts. L929 cells were exposed to either POX (10 nm) or 1.0 μm MLT in the absence and presence of increased concentrations of MCP. The protective effect of MCP on these organophosphate-stimulated apoptotic events was evaluated by flow cytometry analysis after staining with annexin-V/propidium iodide, processing and activation of the executioner caspase-3, cleavage of the poly-ADP ribose polymerase, fragmentation of the nucleosomal DNA and disruption of the mitochondrial membrane potential (Δψ)...
October 13, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/29016517/pediatric-poisonings-in-a-rural-ugandan-emergency-department
#11
Katherine L Boyle, Usha Periyanayagam, Kavita M Babu, Brian T Rice, Mark Bisanzo
OBJECTIVE: This study aims to describe pediatric poisonings presenting to a rural Ugandan emergency department (ED), identifying demographic factors and causative agents. METHODS: This retrospective study was conducted in the ED of a rural hospital in the Rukungiri District of Uganda. A prospectively collected quality assurance database of ED visits was queried for poisonings in patients under the age of 5 who were admitted to the hospital. Cases were included if the chief complaint or final diagnosis included anything referable to poisoning, ingestion, or intoxication, or if a toxicologic antidote was administered...
October 9, 2017: Pediatric Emergency Care
https://www.readbyqxmd.com/read/28977266/potential-clinical-application-of-surface-electromyography-as-indicator-of-neuromuscular-recovery-during-weaning-tests-after-organophosphate-poisoning
#12
Maria Bernarda Salazar Sánchez, Alher Mauricio Hernández Valdivieso, Miguel Ángel Mañanas Villanueva, Andrés Felipe Zuluaga Salazar
This study aimed to explore the usefulness of measuring respiratory muscle activity in mechanically ventilated patients suffering from acute organophosphate poisoning, with a view towards providing complementary information to determine the best time to suspend ventilatory support. Surface electromyography in respiratory muscles (diaphragm, external intercostal and sternocleidomastoid muscles) was recorded in a young man affected by self-poisoning with an unknown amount of parathion to determine the muscle activity level during several weaning attempts from mechanical ventilation...
April 2017: Revista Brasileira de Terapia Intensiva
https://www.readbyqxmd.com/read/28959515/acute-renal-failure-due-to-organophosphate-poisoning-a-case-report
#13
Rizwan Zafar, Kamran Munawar, Adeel Nasrullah, Shujaul Haq, Haider Ghazanfar, Abu Baker Sheikh, Ali Y Khan
Organophosphate (OP) poisoning is a commonly seen condition in many countries. OP poisoning classically presents with symptoms of cholinergic excess. It can rarely affect other organ systems but when it does, it can worsen a patient's overall prognosis. We present a case of a 23-year-old man with an extremely rare case of acute kidney injury due to OP, who was successfully treated with a combination of hemodialysis, atropine and pralidoxime days after OP poisoning with reservations on the aging process.
July 27, 2017: Curēus
https://www.readbyqxmd.com/read/28951697/organophosphate-poisoning-and-terrorism
#14
Tetsuya Tanimoto, Yasuo Oshima, Koichiro Yuji, Akihiko Ozaki, Masahiro Kami
No abstract text is available yet for this article.
August 2017: Malaysian Journal of Medical Sciences: MJMS
https://www.readbyqxmd.com/read/28939237/brief-isoflurane-administration-as-a-post-exposure-treatment-for-organophosphate-poisoning
#15
Jishnu K S Krishnan, Taíza H Figueiredo, John R Moffett, Peethambaran Arun, Abhilash P Appu, Narayanan Puthillathu, Maria F Braga, Thomas Flagg, Aryan M Namboodiri
Organophosphate chemical threat agents (OP-CTA) exert toxic effects through cholinergic over-activation. However, after the initial cholinergic phase, the pathophysiology shifts to a non-cholinergic phase which leads to prolonged status epilepticus (SE), irreversible neuronal degeneration and long-term damage to the central nervous system. The efficacy of delayed treatments against OP-CTA is generally low due to the fact that most drugs fail to inhibit the later phase of non-cholinergic activation. Recently, we reported that intranasal brain delivery of obidoxime (OBD) provides complete neuroprotection against a lethal dose of paraoxon when administered 5min after intoxication...
September 20, 2017: Neurotoxicology
https://www.readbyqxmd.com/read/28904524/prevalence-circumstances-and-management-of-acute-pesticide-poisoning-in-hospitals-in-kampala-city-uganda
#16
Charles Ssemugabo, Abdullah Ali Halage, Ruth Mubeezi Neebye, Victoria Nabankema, Massy Moses Kasule, Deogratius Ssekimpi, Erik Jørs
This study was aimed at assessing prevalence, circumstance, and management of acute pesticide poisoning in hospitals in Kampala. It was a retrospective cross-sectional study that involved reviewing of 739 poisoning patient records from 5 hospitals in Kampala. Of the 739 patients, 212 were due to pesticide poisoning resulting in a prevalence of 28.8%. About 91.4% (191/210) of the cases were due to organophosphate poisoning, 63.3% (133/210) were intentional, and 98.1% (206/210) were exposed through ingestion...
2017: Environmental Health Insights
https://www.readbyqxmd.com/read/28901626/acute-poisonings-during-pregnancy-and-in-other-non-pregnant-women-in-emergency-departments-of-four-government-hospitals-addis-ababa-ethiopia-2010-2015
#17
Mebrahtu Eyasu, Tolesa Dida, Yoseph Worku, Solomon Worku, Mensur Shafie
OBJECTIVE: To characterise acute poisonings in pregnant and non-pregnant women treated at emergency departments of government hospitals in Addis Ababa, Ethiopia, between 2010 and 2015. METHODS: All data for acutely poisoned women were retrospectively collected from patient medical charts at the emergency departments of Saint Paul's Hospital Millennium Medical College, Ras Desta Memorial Hospital, Yekatit 12 Hospital Medical College and Zewditu Memorial Hospital...
October 2017: Tropical Medicine & International Health: TM & IH
https://www.readbyqxmd.com/read/28894590/trpa1-channel-mediates-organophosphate-induced-delayed-neuropathy
#18
Qiang Ding, Sui Fang, Xueqin Chen, Youxin Wang, Jian Li, Fuyun Tian, Xiang Xu, Bernard Attali, Xin Xie, Zhaobing Gao
The organophosphate-induced delayed neuropathy (OPIDN), often leads to paresthesias, ataxia and paralysis, occurs in the late-stage of acute poisoning or after repeated exposures to organophosphate (OP) insecticides or nerve agents, and may contribute to the Gulf War Syndrome. The acute phase of OP poisoning is often attributed to acetylcholinesterase inhibition. However, the underlying mechanism for the delayed neuropathy remains unknown and no treatment is available. Here we demonstrate that TRPA1 channel (Transient receptor potential cation channel, member A1) mediates OPIDN...
2017: Cell Discovery
https://www.readbyqxmd.com/read/28853097/application-of-tetrameric-recombinant-human-butyrylcholinesterase-as-a-biopharmaceutical-for-amelioration-of-symptoms-of-acute-organophosphate-poisoning
#19
S S Terekhov, V A Palikov, Y A Palikova, I A Dyachenko, O G Shamborant, I V Smirnov, P Masson, A G Gabibov
We present a procedure for optimizing the expression of recombinant tetrameric butyrylcholinesterase that enables large-scale production with the yield >30 mg/liter (>90 mg/roller bottle). Intravenous injection of the preparation significantly increased survival and decreased the severity of symptoms of poisoning with paraoxon, an organophosphorus toxin.
August 29, 2017: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28811766/prognostic-factors-determining-morbidity-and-mortality-in-organophosphate-poisoning
#20
Ayca Acikalin, Nezihat Rana Dişel, Selcuk Matyar, Ahmet Sebe, Zeynep Kekec, Yuksel Gokel, Emre Karakoc
OBJECTIVE: Our aim in this retrospective study was to determine the factors affecting poor prognosis and mortality of organophosphate (OP) poisoning by reviewing patient data. We also reviewed present knowledge to make conclusions on certain longstanding debates in light of the literature. METHODS: In this retrospective descriptive study, patients who were admitted to and hospitalized in the emergency department (ED) or intensive care unit (ICU) of a university hospital with the diagnosis of OP poisoning between December 2010 and December 2015 were evaluated...
May 2017: Pakistan Journal of Medical Sciences Quarterly
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