keyword
MENU ▼
Read by QxMD icon Read
search

Toxicants

keyword
https://www.readbyqxmd.com/read/28346882/determination-of-prodrug-treosulfan-and-its-biologically-active-monoepoxide-in-rat-plasma-liver-lungs-kidneys-muscle-and-brain-by-hplc-esi-ms-ms-method
#1
Michał Romański, Anna Kasprzyk, Artur Teżyk, Agnieszka Widerowska, Czesław Żaba, Franciszek Główka
A prodrug treosulfan (TREO) is currently investigated in clinical trials for conditioning prior to hematopoietic stem cell transplantation. Bioanalysis of TREO and its active derivatives, monoepoxide (S,S-EBDM) and diepoxide, in plasma and urine underlay the pharmacokinetic studies of these compounds but cannot explain an organ pharmacological action or toxicity. Recently, distribution of TREO and S,S-EBDM into brain, cerebrospinal fluid, and aqueous humor of the eye has been investigated in animal models and the obtained results presented clinical relevance...
March 18, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28346874/protective-effects-of-hepatocyte-specific-glycyrrhetic-derivatives-against-carbon-tetrachloride-induced-liver-damage-in-mice
#2
Yifei Yang, Lingyun Yang, Yaodan Han, Zhenwei Wu, Pan Chen, Huibin Zhang, Jinpei Zhou
Glycyrrhetic acid (GA), the main hydrolysate of glycyrrhizic acid extracted from the roots of the Chinese herb Glycyrrhiza glabra, was reported to be accumulated in hepatocytes due to the extensive distribution of GA receptors in liver. A series of hepatocyte-specific derivatives on the basis of anetholtrithione and glycyrrhizic were designed and synthesized. The potential beneficial effect was evaluated in carbon tetrachloride (CCl4)-induced liver injury model. In addition, the hepatoprotective activity of these derivatives was assessed by measuring levels of serum marker enzymes, including serum glutamate oxaloacetate transaminase (GOT), serum glutamate pyruvate transaminase (GPT), alkaline phosphatase (AKP), lactate dehydrogenase (LDH) and the ratio of GSH to GSSG...
March 20, 2017: Bioorganic Chemistry
https://www.readbyqxmd.com/read/28346872/5-bromo-2-aryl-benzimidazole-derivatives-as-non-cytotoxic-potential-dual-inhibitors-of-%C3%AE-glucosidase-and-urease-enzymes
#3
Tanzila Arshad, Khalid Mohammed Khan, Najma Rasool, Uzma Salar, Shafqat Hussain, Humna Asghar, Mohammed Ashraf, Abdul Wadood, Muhammad Riaz, Shahnaz Perveen, Muhammad Taha, Nor Hadiani Ismail
On the basis of previous report on promising α-glucosidase inhibitory activity of 5-bromo-2-aryl benzimidazole derivatives, these derivatives were further screened for urease inhibitory and cytotoxicity activity in order to get more potent and non-cytotoxic potential dual inhibitor for the patients suffering from diabetes as well as peptic ulcer. In this study, all compounds showed varying degree of potency in the range of (IC50=8.15±0.03-354.67±0.19μM) as compared to standard thiourea (IC50=21.25±0.15μM)...
March 20, 2017: Bioorganic Chemistry
https://www.readbyqxmd.com/read/28346771/cohort-study-of-oncologic-emergencies-in-patients-with-head-and-neck-cancer
#4
Cielito C Reyes-Gibby, Stephanie C Melkonian, Ehab Y Hanna, Sai-Ching J Yeung, Charles Lu, Mark S Chambers, Srinivas R Banala, Gary B Gunn, Sanjay S Shete
BACKGROUND: Treatments for head and neck squamous cell carcinoma (HNSCC) are associated with toxicities that lead to emergency department presentation. METHODS: We utilized data from an ongoing prospective cohort of newly diagnosed, previously untreated patients (N = 298) with HNSCC to evaluate the association between clinical and epidemiologic factors and risk for and frequency of emergency department presentation. Time to event was calculated from the date of treatment initiation to emergency department presentation, date of death, or current date...
March 27, 2017: Head & Neck
https://www.readbyqxmd.com/read/28346744/radiopaque-uhmwpe-sublaminar-cables-for-spinal-deformity-correction-preclinical-mechanical-and-radiopacifier-leaching-assessment
#5
Alex K Roth, Karlien Boon-Ceelen, Harold Smelt, Bert van Rietbergen, Paul C Willems, Lodewijk W van Rhijn, Jacobus J Arts
Polymeric sublaminar cables have a number of advantages over metal cables in the field of spinal deformity surgery, with decreased risk of neurological injury and potential for higher correction forces as the two most predominant. However, currently available polymer cables are radiolucent, precluding postoperative radiological assessment of instrumentation stability and integrity. This study provides a preclinical assessment of a woven UHMWPE cable made with radiopaque UHMWPE fibers. Our primary goal was to determine if the addition of a radiopacifier negatively affects the mechanical properties of UHMWPE woven cables...
March 27, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28346731/exploring-the-influence-of-mpa-capped-cdte-quantum-dots-on-the-structure-and-function-of-lysozyme-probing-by-spectroscopic-and-calorimetric-methods
#6
Lining Zhao, Tao Sun, Xun Zhang, Wei Song, Rutao Liu
The effect of 3-mercaptopropionic acid (MPA)-capped CdTe quantum dots (QDs) on lysozyme was systematically investigated by spectroscopic methods, enzyme activity assay, and calorimetry techniques. Results show that the MPA-capped CdTe QDs binded to lysozyme through van der Walls forces and hydrogen bondings, causing the decrement of α-helical content (∼7%) and increment of β-sheet content (∼11%) of lysozyme. The binding caused static quenching of the fluorescence, while the microenvironment of aromatic amino acid residues did not show any significant alteration...
March 27, 2017: Journal of Biochemical and Molecular Toxicology
https://www.readbyqxmd.com/read/28346659/is-universal-hla-b-15-02-screening-a-cost-effective-option-in-an-ethnically-diverse-population-a-case-study-of-malaysia
#7
H Y Chong, Z Mohamed, L L Tan, D B C Wu, F H Shabaruddin, M Dahlui, Y D Apalasamy, S R Snyder, M S Williams, J Hao, L H Cavallari, N Chaiyakunapruk
BACKGROUND: Strong association was documented between human leukocyte antigen (HLA)-B*15:02 and carbamazepine-induced severe cutaneous adverse reactions (SCARs) in Asians. Beyond Asia, the HLA testing is potentially valuable in many countries with increasingly diverse communities of Asian ancestry, to facilitate an early recognition of patient susceptibility to SCARs. OBJECTIVE: To determine the cost-effectiveness of universal HLA-B*15:02 screening in preventing carbamazepine-induced Stevens-Johnson syndrome/ toxic epidermal necrolysis in an ethnically-diverse Malaysian population...
March 27, 2017: British Journal of Dermatology
https://www.readbyqxmd.com/read/28346656/7-year-follow-up-after-stereotactic-ablative-radiotherapy-for-patients-with-stage-i-non-small-cell-lung-cancer-results-of-a-phase-2-clinical-trial
#8
Bing Sun, Eric D Brooks, Ritsuko U Komaki, Zhongxing Liao, Melenda D Jeter, Mary F McAleer, Pamela K Allen, Peter A Balter, James D Welsh, Michael S O'Reilly, Daniel Gomez, Stephen M Hahn, Jack A Roth, Reza J Mehran, John V Heymach, Joe Y Chang
BACKGROUND: The authors evaluated the efficacy, patterns of failure, and toxicity of stereotactic ablative radiotherapy (SABR) for patients with medically inoperable, clinical stage I non-small cell lung cancer (NSCLC) in a prospective clinical trial with 7 years of follow-up. Clinical staging was performed according to the seventh edition of the American Joint Committee on Cancer TNM staging system. METHODS: Eligible patients with histologically confirmed NSCLC of clinical stage I as determined using positron emission tomography staging were treated with SABR (50 grays in 4 fractions)...
March 27, 2017: Cancer
https://www.readbyqxmd.com/read/28346357/comparison-of-the-in-vivo-biotransformation-of-two-emerging-estrogenic-contaminants-bp2-and-bps-in-zebrafish-embryos-and-adults
#9
Vincent Le Fol, François Brion, Anne Hillenweck, Elisabeth Perdu, Sandrine Bruel, Selim Aït-Aïssa, Jean-Pierre Cravedi, Daniel Zalko
Zebrafish embryo assays are increasingly used in the toxicological assessment of endocrine disruptors. Among other advantages, these models are 3R-compliant and are fit for screening purposes. Biotransformation processes are well-recognized as a critical factor influencing toxic response, but major gaps of knowledge exist regarding the characterization of functional metabolic capacities expressed in zebrafish. Comparative metabolic studies between embryos and adults are even scarcer. Using ³H-labeled chemicals, we examined the fate of two estrogenic emerging contaminants, benzophenone-2 (BP2) and bisphenol S (BPS), in 4-day embryos and adult zebrafish...
March 25, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28346313/population-pharmacokinetics-of-gemcitabine-and-dfdu-in-pancreatic-cancer-patients-using-an-optimal-design-sparse-sampling-approach
#10
Cindy Serdjebi, Florence Gattacceca, Jean-François Seitz, Francine Fein, Johan Gagnière, Eric François, Abakar Abakar-Mahamat, Gael Deplanque, Madani Rachid, Bruno Lacarelle, Joseph Ciccolini, Laetitia Dahan
BACKGROUND: Gemcitabine remains a pillar in pancreatic cancer treatment. However, toxicities are frequently observed. Dose adjustment based on therapeutic drug monitoring might help decrease the occurrence of toxicities. In this context, this work aims at describing the pharmacokinetics (PK) of gemcitabine and its metabolite dFdU in pancreatic cancer patients and at identifying the main sources of their PK variability using a population pharmacokinetics approach, despite a sparse sampled-population and heterogeneous administration and sampling protocols...
March 24, 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28346105/high-throughput-clonogenic-analysis-of-3d-cultured-patient-derived-cells-with-a-micropillar-and-microwell-chip
#11
Dong Woo Lee, Sang-Yun Lee, Lily Park, Mi-Sun Kang, Myoung-Hee Kim, Il Doh, Gyu Ha Ryu, Do-Hyun Nam
A high-throughput clonogenic assay with a micropillar-microwell chip platform is proposed by using the colony area of glioblastoma multiforme (GBM) patient-derived cells (PDCs) from colony images. Unlike conventional cell lines, PDCs from the tumor are composed of heterogeneous cell populations, and some clonogenic populations form colonies during culture while the rest die off or remain unchanged, thus causing the diverse distribution of colony size. Therefore, area-based analysis of the total colonies is not sufficient to estimate total cell viability or toxicity responses...
February 1, 2017: SLAS Discov
https://www.readbyqxmd.com/read/28346092/screening-for-protein-protein-interaction-inhibitors-using-a-bioluminescence-resonance-energy-transfer-bret-based-assay-in-yeast
#12
Caroline Corbel, Sara Sartini, Elisabetta Levati, Pierre Colas, Laurent Maillet, Cyril Couturier, Barbara Montanini, Stéphane Bach
The bioluminescence resonance energy transfer (BRET) technology is a widely used live cell-based method for monitoring protein-protein interactions as well as conformational changes within proteins or molecular complexes. Considering the emergence of protein-protein interactions as a new promising class of therapeutic targets, we have adapted the BRET method in budding yeast. In this technical note, we describe the advantages of using this simple eukaryotic model rather than mammalian cells to perform high-throughput screening of chemical compound collections: genetic tractability, tolerance to solvent, rapidity, and no need of expensive robotic systems...
January 1, 2017: SLAS Discov
https://www.readbyqxmd.com/read/28346074/germline-genetic-predictors-of-aromatase-inhibitor-concentrations-estrogen-suppression-and-drug-efficacy-and-toxicity-in-breast-cancer-patients
#13
Daniel L Hertz, N Lynn Henry, James M Rae
The third-generation aromatase inhibitors (AIs), anastrozole, letrozole and exemestane, are highly effective for the treatment of estrogen receptor-positive breast cancer in postmenopausal women. AIs inhibit the aromatase (CYP19A1)-mediated production of estrogens. Most patients taking AIs achieve undetectable blood estrogen concentrations resulting in drug efficacy with tolerable side effects. However, some patients have suboptimal outcomes, which may be due, in part, to inherited germline genetic variants...
March 27, 2017: Pharmacogenomics
https://www.readbyqxmd.com/read/28346071/mineral-composition-and-toxic-element-levels-of-muscle-liver-and-kidney-of-intensive-swedish-landrace-and-extensive-mangulica-pigs-from-serbia
#14
Dragica Nikolic, Jasna Djinovic-Stojanovic, Sasa Jankovic, Nikola Stanisic, Cedomir Radovic, Lato Pezo, Mila Lausevic
Mineral composition (Fe, Zn, Cu, Mn, Se, Cr, Co, Ni, Na, K, Mg, Ca) and toxic element levels (Cd, Pb, Hg, As) of soil, feed and tissue (muscle, liver and kidney) from intensive (Swedish Landrace, housed indoors, fed a known diet, 4 years) and extensive (Mangulica, free-roaming, non-specified diet, 7-8 months) pigs was determined by inductively coupled plasma mass spectrometry (ICP-MS). Controlled nutrition produced pigs with higher concentrations of most minerals (muscle: Mn, Se, K, Mg; liver: Zn, Cu, Mn, Se, Cr, Ca; kidney: Zn, Cu, Mn, Se, K, Mg), but for Fe, the opposite trend was found...
March 27, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28346059/deferasirox-pharmacogenetic-influence-on-pharmacokinetic-efficacy-and-toxicity-in-a-cohort-of-pediatric-patients
#15
Sarah Allegra, Silvia De Francia, Jessica Cusato, Arianna Arduino, Davide Massano, Filomena Longo, Antonio Piga, Antonio D'Avolio
AIM: We aimed to evaluate the influence of genetic polymorphisms involved in deferasirox metabolism and transport on its pharmacokinetics and treatment toxicity, in a cohort of β-thalassaemic children. PATIENTS & METHODS: Drug plasma concentrations were measured by a HPLC-UV method. Allelic discrimination for UGT1A1, UGT1A3, CYP1A1, CYP1A2, CYP2D6, MRP2 and BCRP1 polymorphisms was performed by real-time PCR. RESULTS: CYP1A1 rs2606345AA influenced Ctrough (p = 0...
March 27, 2017: Pharmacogenomics
https://www.readbyqxmd.com/read/28346057/the-role-of-germline-variants-in-chemotherapy-outcome-in-brain-tumors-a-systematic-review-of-pharmacogenetic-studies
#16
Marije J Klumpers, Marieke Jh Coenen, Corrie Em Gidding, D Maroeska Wm Te Loo
AIM: This systematic review provides an overview of publications concerning pharmacogenetic research in pediatric patients with medulloblastoma and low-grade glioma. MATERIALS & METHODS: Three electronic databases searches including a manual search were performed to identify studies investigating potential interactions between germline variants and chemotherapy efficacy and toxicity. RESULTS: Out of 3570 citations, 21 studies were included...
March 27, 2017: Pharmacogenomics
https://www.readbyqxmd.com/read/28346009/reactions-with-antisera-and-pathological-effects-of-staphylococcus-aureus-gamma-toxin-in-the-cornea
#17
Michael A Bierdeman, Angela M Torres, Armando R Caballero, Aihua Tang, Richard J O'Callaghan
PURPOSE: This study analyzed the toxicity of purified gamma-toxin from Staphylococcus aureus and the protectiveness of antisera to gamma-toxin in the rabbit cornea. MATERIALS AND METHODS: Gamma-toxin was purified from cultures of alpha-toxin deficient S. aureus strain Newman Δhla. Antisera to native gamma-toxin (Hlg) were produced in rabbits. These antisera and a commercial polyclonal antibody to recombinant HlgB (rHlgB) were analyzed for specificity and toxin neutralization...
March 27, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28346007/lipid-emulsion-improves-survival-in-animal-models-of-local-anesthetic-toxicity-a-meta-analysis
#18
Michael R Fettiplace, Daniel J McCabe
INTRODUCTION: The Lipid Emulsion Therapy workgroup, organized by the American Academy of Clinical Toxicology, recently conducted a systematic review, which subjectively evaluated lipid emulsion as a treatment for local anesthetic toxicity. We re-extracted data and conducted a meta-analysis of survival in animal models. METHODS: We extracted survival data from 26 publications and conducted a random-effect meta-analysis based on odds ratio weighted by inverse variance...
February 17, 2017: Clinical Toxicology
https://www.readbyqxmd.com/read/28345963/accumulation-and-speciation-of-cd-in-avicennia-marina-tissues
#19
Li Jian, Yan Chongling, Du Daolin, Lu Haoliang, Liu Jingchun
Avicennia marina is a high Cd tolerant species in the mangrove wetlands. A hydroponic experiment was carried out to research the accumulation and chemical form distribution of Cd in the tissues of A. marina under different concentration and time of Cd stress. It was found that the concentrations of Cd in plant tissues followed the order of root> stem>leaf. The data suggested that root activity decreased, Cd accumulation ability weakened in roots and the Translocation Factor increased in stems and leaves with the increase of stress time...
March 27, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28345936/co-registered-molecular-logic-gate-with-a-co-releasing-molecule-triggered-by-light-and-peroxide
#20
Upendar Reddy Gandra, Jörg Axthelm, Patrick Hoffmann, Nandaraj Taye, Steve Glaeser, Helmar Görls, Samantha L Hopkins, Winfried Plass, Ute Neugebauer, Sylvestre Bonnet, Alexander Schiller
Co-registered molecular logic gates combine two different in- and outputs, such as light and matter. We introduce a biocompatible CO-releasing molecule (CORM A) as Mn(I) tricarbonyl complex with the ligand 5-(dimethylamino)-N, N-bis(pyridin-2-ylmethyl) naphthalene-1-sulfonamide (L). CO release is chaperoned by turn-on fluorescence and can be triggered by light (405 nm) as well as with hydrogen peroxide in aqueous phosphate buffer. Complex A behaves as a logic OR gate via co-registering the inputs of irradia-tion (light) and peroxide (matter) into the concomitant outputs fluorescence (light) and CO (matter)...
March 27, 2017: Journal of the American Chemical Society
keyword
keyword
37554
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"