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Toxicology

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https://www.readbyqxmd.com/read/28448027/dry-powder-and-nebulized-aerosol-inhalation-of-pharmaceuticals-delivered-to-mice-using-a-nose-only-exposure-system
#1
Jonathan E Phillips, Xuxia Zhang, James A Johnston
Obstructive respiratory diseases like asthma and chronic obstructive pulmonary disease (COPD) are currently treated by inhaled anti-inflammatory and bronchodilator drugs. Despite the availability of multiple treatments, both diseases are growing public health concerns. The majority of asthma patients are well controlled on current inhaled therapies but a substantial number of patients with severe asthma are not. Asthma affects an estimated 300 million people worldwide and approximately 20 percent have a severe form of the disease...
April 6, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28447886/drug-induced-hyperlactatemia
#2
Eike Blohm, Jeffrey Lai, Mark Neavyn
BACKGROUND: Hyperlactatemia is common in critically ill patients and has a variety of etiologies. Medication toxicity remains an uncommon cause that providers often fail to recognize. In this article, we review several medications that cause hyperlactatemia in either therapeutic or supratherapeutic dosing. When known, the incidence, mortality, pathophysiology, and treatment options are discussed. METHODS: We performed a literature search using PUBMED and Google Scholar for English language articles published after 1980 regarding medication induced hyperlactatemia and its management...
April 27, 2017: Clinical Toxicology
https://www.readbyqxmd.com/read/28447134/-poisonings-in-germany-poisons-centres-medical-management-and-national-monitoring
#3
REVIEW
Herbert Desel, Helmut Hentschel, Andreas Stürer
BACKGROUND: Illnesses caused by exposure to extracorporeal artificial substances play a major role in emergency medicine, family medicine, and environmental medicine. OBJECTIVE: The current situation of medical poisoning management and national reporting of poisonings in Germany are described. MATERIALS UND METHODS: The information and data presented here are derived from a literature review and from stakeholder interviews. RESULTS AND CONCLUSION: Eight poison centres (PCs) offer consultation supporting the diagnosis and treatment of poisoning cases in Germany today...
April 26, 2017: Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz
https://www.readbyqxmd.com/read/28447031/microfluidic-concentric-gradient-generator-design-for-high-throughput-cell-based-studies
#4
Elishai Ezra Tsur, Michal Zimerman, Idan Maor, Avner Elrich, Yaakov Nahmias
Gradients of diffusible signaling molecules play important role in various processes, ranging from cell differentiation to toxicological evaluation. Microfluidic technology provides an accurate control of tempospatial conditions. However, current microfluidic platforms are not designed to handle multiple gradients and cell populations simultaneously. Here, we demonstrate a rapidly adaptable microfluidic design able to expose multiple cell populations to an array of chemical gradients. Our design is based on pressure-equilibrated concentric channels and a pressure-dissipating control layer, facilitating the seeding of multiple cell populations in a single device...
2017: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/28446067/the-chemical-disruption-of-human-metabolism
#5
Stephen J Genuis, Edmond Kyrillos
BACKGROUND: Recent evidence highlights the reality of unprecedented human exposure to toxic chemical agents found throughout our environment - in our food and water supply, in the air we breathe, in the products we apply to our skin, in the medical and dental materials placed into our bodies, and even within the confines of the womb. With biomonitoring confirming the widespread bioaccumulation of myriad toxicants among population groups, expanding research continues to explore the pathobiological impact of these agents on human metabolism...
April 26, 2017: Toxicology Mechanisms and Methods
https://www.readbyqxmd.com/read/28444659/new-psychoactive-substances-nps-a-challenge-for-the-addiction-treatment-services
#6
Norbert Scherbaum, F Schifano, Udo Bonnet
Over the last few years, hundreds of new psychoactive substances (NPS) have been identified in Europe. Apart from some herbal compounds, NPS mainly include synthetic cannabinoids and a range of new synthetic stimulants (e. g., cathinones). Synthetic NPS are often developed whilst modifying the basic chemical (e. g., phenethylamine or tryptamine) structure. Although the pharmacology and toxicology of most NPS are hardly known, they are being offered, especially online, as "bath salts," as "incense mixtures," or under other misleading labels...
April 25, 2017: Pharmacopsychiatry
https://www.readbyqxmd.com/read/28444439/back-to-the-future-part-2-post-mortem-assessment-and-evolutionary-role-of-the-bio-medicolegal-sciences
#7
REVIEW
Santo Davide Ferrara, Giovanni Cecchetto, Rossana Cecchi, Donata Favretto, Silke Grabherr, Takaki Ishikawa, Toshikazu Kondo, Massimo Montisci, Heidi Pfeiffer, Maurizio Rippa Bonati, Dina Shokry, Marielle Vennemann, Thomas Bajanowski
Part 2 of the review "Back to the Future" is dedicated to the evolutionary role of the bio-medicolegal sciences, reporting the historical profiles, the state of the art, and prospects for future development of the main related techniques and methods of the ancillary disciplines that have risen to the role of "autonomous" sciences, namely, Genetics and Genomics, Toxicology, Radiology, and Imaging, involved in historic synergy in the "post-mortem assessment," together with the mother discipline Legal Medicine, by way of its primary fundament, universally denominated as Forensic Pathology...
April 25, 2017: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/28443181/development-of-a-test-method-for-the-evaluation-of-dna-damage-in-mouse-spermatogonial-stem-cells
#8
Hye Lyun Jeon, Jung-Sun Yi, Tae Sung Kim, Youkyung Oh, Hye Jeong Lee, Minseong Lee, Jin Seok Bang, Kinarm Ko, Il Young Ahn, Kyungyuk Ko, Joohwan Kim, Hye-Kyung Park, Jong Kwon Lee, Soo Jung Sohn
Although alternative test methods based on the 3Rs (Replacement, Reduction, Refinement) are being developed to replace animal testing in reproductive and developmental toxicology, they are still in an early stage. Consequently, we aimed to develop alternative test methods in male animals using mouse spermatogonial stem cells (mSSCs). Here, we modified the OECD TG 489 and optimized the in vitro comet assay in our previous study. This study aimed to verify the validity of in vitro tests involving mSSCs by comparing their results with those of in vivo tests using C57BL/6 mice by gavage...
April 2017: Toxicological Research
https://www.readbyqxmd.com/read/28442873/anagen-effluvium-following-acute-colchicine-poisoning
#9
Andrea Combalia, Carola Baliu-Piqué, Adriana Fortea, Juan Ferrando
We present a case of a 17-year-old girl admitted to the Psychiatric Department recovering from a suicide attempt with colchicine. One week after poisoning, a sudden onset of hair loss was observed. Positive hair pull test and trichoscopy demonstrated the presence of anagen hairs with pigmented long roots covered by the root sheaths. Colchicine poisoning is an uncommon, but potentially life-threatening toxicologic emergency. An overdose of colchicine inhibits cell division, and thus the most affected organs are those which have a high rate of cell turnover...
October 2016: International Journal of Trichology
https://www.readbyqxmd.com/read/28442739/mixing-of-quantum-states-a-new-route-to-creating-optical-activity
#10
Anvar S Baimuratov, Nikita V Tepliakov, Yurii K Gun'ko, Alexander V Baranov, Anatoly V Fedorov, Ivan D Rukhlenko
The ability to induce optical activity in nanoparticles and dynamically control its strength is of great practical importance due to potential applications in various areas, including biochemistry, toxicology, and pharmaceutical science. Here we propose a new method of creating optical activity in originally achiral quantum nanostructures based on the mixing of their energy states of different parities. The mixing can be achieved by selective excitation of specific states or via perturbing all the states in a controllable fashion...
December 5, 2016: Scientific Reports
https://www.readbyqxmd.com/read/28442410/subchronic-feeding-study-of-high-free-lysine-transgenic-rice-in-sprague-dawley-rats
#11
Qing-Qing Yang, Xiao-Yun He, Hong-Yu Wu, Chang-Quan Zhang, Shi-Ying Zou, Tian-Qi Lang, Samuel Sai-Ming Sun, Qiao-Quan Liu
Lysine is considered to be the first essential amino acid in rice. An elite High-Free-Lysine transgenic line HFL1 was previously produced by metabolic engineering to regulate lysine metabolism. In this study, a 90-day toxicology experiment was undertaken to investigate the potential health effect of feeding different doses of HFL1 rice to Sprague-Dawley rats. During the trial, body weight gain, food consumption and food efficiency were recorded, and no adverse effect was observed in rats fed transgenic (T) rice diets compared with non-transgenic (N) or control diets...
April 22, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28442326/inhaled-efficacious-dose-translation-from-rodent-to-human-a-retrospective-analysis-of-clinical-standards-for-respiratory-diseases
#12
REVIEW
J E Phillips
Clinical pharmacologists and toxicologists are often faced with predicting equivalent dosages for humans from biological observations in laboratory animals. Allometric scaling has been used extensively as the basis for extrapolation of drug dosage that might be expected to produce the equivalent biological effects. Allometry is the study of size and its consequences and it is based on the anatomical, physiological, and biochemical similarities between animals. In this review, retrospective analyses have been performed based on data reported in the literature in an attempt to determine the utility of allometric scaling for human dose projections from pre-clinical data for compounds that are delivered by inhalation...
April 22, 2017: Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28441746/high-performance-prediction-of-human-estrogen-receptor-agonists-based-on-chemical-structures
#13
Yuki Asako, Yoshihiro Uesawa
Many agonists for the estrogen receptor are known to disrupt endocrine functioning. We have developed a computational model that predicts agonists for the estrogen receptor ligand-binding domain in an assay system. Our model was entered into the Tox21 Data Challenge 2014, a computational toxicology competition organized by the National Center for Advancing Translational Sciences. This competition aims to find high-performance predictive models for various adverse-outcome pathways, including the estrogen receptor...
April 23, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28441593/a-comprehensive-evaluation-of-the-environmental-quality-of-a-coastal-lagoon-ravenna-italy-integrating-chemical-and-physiological-analyses-in-mussels-as-a-biomonitoring-strategy
#14
Marco Capolupo, Silvia Franzellitti, Alisar Kiwan, Paola Valbonesi, Enrico Dinelli, Emanuela Pignotti, Manfred Birke, Elena Fabbri
This study aimed at evaluating the environmental quality of a coastal lagoon (Pialassa Piomboni, NW-Adriatic, Italy) by combining analyses of biomarkers of environmental stress and bioaccumulation of contaminants in marine mussels (Mytilus galloprovincialis) transplanted for 28days to six selected sites. Assessed biomarkers encompassed lysosomal endpoints, oxidative stress and detoxification parameters, specific responses to metals, neuro- and genotoxic substances; chemical analyses focused on PAHs, metals, pesticide and pharmaceuticals...
April 22, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28440957/the-role-of-high-throughput-screening-in-ecotoxicology-and-engineered-nanomaterials
#15
REVIEW
Andrew Barrick, Amélie Châtel, Mélanie Bruneau, Catherine Mouneyrac
The field of environmental toxicology developed as a result of growing concerns about anthropogenic influences on the environment and how to ameliorate ecological impact. Many governmental bodies are beginning to emphasize prevention rather than mitigation when addressing novel products, leading to more of a focus on identifying potential toxicity prior to release. With the exponential advances in their development and sale, novel metamaterials and biotechnology are set to dramatically outpace the capabilities of current testing strategies...
April 25, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28440681/discovery-and-preclinical-development-of-dasabuvir-for-the-treatment-of-hepatitis-c-infection
#16
Mohamed El Kassas, Tamer Elbaz, Enas Hafez, Mohamed Naguib Wifi, Gamal Esmat
Hepatitis C virus (HCV) is a leading cause of liver-related morbidity and mortality. Positively, the introduction of new directly-acting antivirals (DAAs) have led to dramatic improvements in response rates to antiviral therapy. Furthermore, newer generations of DAAs have demonstrated better safety profiles as well as efficacy than older generations. Current treatment recommendations are based on different combinations of DAAs. Current combination therapies rely on agents that target the different steps of viral replication by using different molecules from various DAAs families...
April 25, 2017: Expert Opinion on Drug Discovery
https://www.readbyqxmd.com/read/28440070/chiral-analysis-of-amphetamines-in-hair-by-liquid-chromatography-tandem-mass-spectrometry-compliance-monitoring-of-attention-deficit-hyperactivity-disorder-adhd-patients-under-elvanse%C3%A2-therapy-and-identification-after-controlled-low-dose-application
#17
Tina M Binz, Elena Williner, Petra Strajhar, Patrick C Dolder, Matthias E Liechti, Markus R Baumgartner, Thomas Kraemer, Andrea E Steuer
Amphetamine (AMP) is used as illicit drug but also for the treatment of attention deficit hyperactivity disorder (ADHD). Respective drugs most often contain the enantiomer (S)-AMP as active compound or (S)-AMP is formed from the prodrug lisdexamfetamine (Elvanse®) whereas the illicit drug is usually traded as racemate ((R/S)-AMP). A differentiation between the use of the medically prescribed drug and the abuse of illicit street amphetamine is of great importance e.g. in retrospective consumption monitoring by hair analysis...
April 24, 2017: Drug Testing and Analysis
https://www.readbyqxmd.com/read/28439620/development-of-an-optimal-filter-substrate-for-the-identification-of-small-microplastic-particles-in-food-by-micro-raman-spectroscopy
#18
Barbara E Oßmann, George Sarau, Sebastian W Schmitt, Heinrich Holtmannspötter, Silke H Christiansen, Wilhelm Dicke
When analysing microplastics in food, due to toxicological reasons it is important to achieve clear identification of particles down to a size of at least 1 μm. One reliable, optical analytical technique allowing this is micro-Raman spectroscopy. After isolation of particles via filtration, analysis is typically performed directly on the filter surface. In order to obtain high qualitative Raman spectra, the material of the membrane filters should not show any interference in terms of background and Raman signals during spectrum acquisition...
April 24, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28438661/systematic-review-of-the-potential-adverse-effects-of-caffeine-consumption-in-healthy-adults-pregnant-women-adolescents-and-children
#19
Daniele Wikoff, Brian T Welsh, Rayetta Henderson, Gregory P Brorby, Janice Britt, Esther Myers, Jeffrey Goldberger, Harris R Lieberman, Charles O'Brien, Jennifer Peck, Milton Tenebein, Connie Weaver, Seneca Harvey, Jonathan Urban, Candace Doepker
To date, one of the most heavily cited assessments of caffeine safety in the peer-reviewed literature is that issued by Health Canada (Nawrot et al., 2003). Since then, >10,000 papers have been published related to caffeine, including hundreds of reviews on specific human health effects; however, to date, none have compared the wide range of topics evaluated by Nawrot et al. (2003). Thus, as an update to this foundational publication, we conducted a systematic review of data on potential adverse effects of caffeine published from 2001 to June 2015...
April 7, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28438101/intravenous-administration-of-cannabis-and-lethal-anaphylaxis
#20
John D Gilbert, Marc Grabowski, Roger W Byard
Cannabis allergy appears to be increasing. A 33-year-old woman is reported who collapsed and died shortly after injecting herself with a cannabis solution prepared by pouring boiling water onto plant material. There were no significant findings at autopsy, except for a single recent venepuncture wound in the left cubital fossa. Toxicological examination of the blood revealed low levels of methylamphetamine and amphetamine with tetrahydrocannabinol (Δ(9)-THC) and 11-nor-9-carboxy-Δ(9)-THC, and no opiates. The syringe used by the decedent contained Δ(9)-THC...
April 2017: Medicine, Science, and the Law
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