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Food and Chemical Toxicology

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https://www.readbyqxmd.com/read/28927898/developmental-toxicity-assessment-of-common-excipients-using-a-stem-cell-based-in-vitro-morphogenesis-model
#1
Chloe J Yuan, Yusuke Marikawa
Various chemical compounds can inflict developmental toxicity when sufficiently high concentrations are exposed to embryos at the critical stages of development. Excipients, such as coloring agents and preservatives, are pharmacologically inactive ingredients that are included in various medications, foods, and cosmetics. However, concentrations that may adversely affect embryo development are largely unknown for most excipients. Here, the lowest observed adverse effect level (LOAEL) to inflict developmental toxicity was assessed for three coloring agents (allura red, brilliant blue, and tartrazine) and three preservatives (butylated hydroxyanisole, metabisulfite, and methylparaben)...
September 16, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28923438/d-limonene-ameliorates-diabetes-and-its-complications-in-streptozotocin-induced-diabetic-rats
#2
Merve Bacanli, Hatice Gül Anlar, Sevtap Aydin, Tuğbagül Çal, Nuray Ari, Ülkü Ündeğer Bucurgat, A Ahmet Başaran, Nurşen Başaran
It is known that diabetes causes some complications including alterations in lipid profile, hepatic enzyme levels but also it causes oxidative stress. Limonene, a major component of Citrus oils, has important health beneficial effects in lowering the level of oxidative stress due to its antioxidant activity. The aim of this study was to investigate the effects of D-limonene on streptozotocin (STZ)-induced diabetes in Wistar albino rats. For this purpose, DNA damage was evaluated by alkaline comet assay. Changes in the activities of catalase (CAT), superoxide dismutase (SOD), glutathione reductase (GR) and glutathione peroxidase (GSHPx) and the levels of 8-hydroxy-2'-deoxyguanosine (8-OHdG), total glutathione (GSH), malondialdehyde (MDA), insulin, total bilirubin and BCA protein, alanine aminotransferase (ALT), aspartate aminotransferase (AST) and gamma-glutamyl transferase (GGT), high density lipoprotein (HDL), low density lipoprotein (LDL), total cholesterol and triglyceride were also evaluated...
September 15, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28923437/in-vitro-studies-with-human-intestinal-epithelial-cell-line-monolayers-for-protein-hazard-characterization
#3
REVIEW
Bryan Delaney
Evaluating the safety of newly expressed proteins in genetically modified (GM) crops is conducted prior to commercialization to determine whether they could present a hazard upon consumption. A multicomponent, weight of evidence approach has been applied to individual proteins that has often included acute oral toxicology studies. Based on resources required to produce and purify the proteins, the number of animals necessary for these studies and the fact that no evidence of hazard has been observed for any of the proteins tested to date, it is questionable whether acute toxicology studies should be conducted for all proteins...
September 15, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28923436/changes-in-hepatic-gene-expression-and-serum-metabolites-after-oral-administration-of-overdosed-vitamin-e-loaded-nanoemulsion-in-rats
#4
Chae Young Park, Chul Ho Jang, Do Yup Lee, Hyung Taek Cho, Young Jun Kim, Yoo Heon Park, Jee-Young Imm
Vitamin-E-loaded nanoemulsion (Vit E-NE) was produced, and the effects of repeated oral administration of Vit E-NE (2 g/kg/day) for five days on hepatic gene expression and serum metabolites were investigated in rats. The mean particle diameter and zeta potential of Vit E-NE was 112 nm and 56 mV, respectively. Vit E-NE administered rats showed significantly higher triglyceride content than of standard diet (control) or Vit E control emulsion (Vit E-CE) group but no toxicity symptoms were found in blood biochemical analysis...
September 15, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28919409/solasodine-3-o-%C3%AE-d-glucopyranoside-is-hydrolyzed-by-a-membrane-glucosidase-into-active-molecule-solasodine-against-candida-albicans
#5
Wenqiang Chang, Ying Li, Sha Zheng, Ming Zhang, Yanhui Gao, Hongxiang Lou
Antifungal activity of some natural molecules can be abated or blocked by efflux pumps in Candida albicans, which restricts the discovery of potential antifungal agents. Here we found that the steroidal alkaloid solasodine is active against C. albicans efflux pump-deficient strains but inert towards the wild type. However, the glucosylated solasodine-3-O-β-D-glucopyranoside exhibits antifungal activity towards the wild type strain. Further investigation revealed that the entry of solasodine into C. albicans cells is blocked by efflux pumps...
September 15, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28919410/tetrabromobisphenol-a-disturbs-zinc-homeostasis-in-cultured-cerebellar-granule-cells-a-dual-role-in-neurotoxicity
#6
Elzbieta Zieminska, Anna Ruszczynska, Jerzy W Lazarewicz
The brominated flame retardant tetrabromobisphenol A (TBBPA) has recognized neurotoxic properties mediated by intracellular Ca(2+) imbalance and oxidative stress. Although these factors are known to trigger the release of Zn(2+) from intracellular stores, the effects of TBBPA on Zn(2+) homeostasis in neurons and the role of Zn(2+)in TBBPA neurotoxicity have not yet been studied. Therefore, we investigated zinc transients in primary cultures of rat cerebellar granule cells and assessed their involvement in TBBPA neurotoxicity...
September 14, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28917435/measurement-of-micronuclei-and-internal-dose-in-mice-demonstrates-that-3-monochloropropane-1-2-diol-3-mcpd-has-no-genotoxic-potency-in-vivo
#7
Jenny Aasa, Margareta Törnqvist, Lilianne Abramsson-Zetterberg
In this study 3-monochloropropane-1,2-diol (3-MCPD), a compound that appears as contaminant in refined cooking oils, has been studied with regard to genotoxicity in vivo (mice) with simultaneous measurement of internal dose using state-of-the-art methodologies. Genotoxicity (chromosomal aberrations) was measured by flow cytometry with dual lasers as the frequency of micronuclei in erythrocytes in peripheral blood from BalbC mice intraperitoneally exposed to 3-MCPD (0, 50, 75, 100, 125 mg/kg). The internal doses of 3-MCPD in the mice were calculated from N-(2,3-dihydroxypropyl)-valine adducts to hemoglobin (Hb), quantified at very low levels by high-resolution mass spectrometry...
September 13, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28899774/further-insights-on-tomato-plant-cytotoxic-and-antioxidant-activity-of-leaf-extracts-in-human-gastric-cells
#8
María Figueiredo-González, Patrícia Valentão, David M Pereira, Paula B Andrade
This study focused the toxicity against human gastric adenocarcinoma cells (AGS) and the antioxidant activity of hydromethanol (HME), acetone (AcE) and alkaloid (AE) extracts prepared from the leaves of tomato plant cultivars (Caramba, Valentine, Negro, Abuela, and Anairis). AE, HME and AcE extracts of all cultivars reduced cell viability (IC50 = 9 ± 2-55 ± 11, 103 ± 25-171 ± 29 and 291 ± 26-459 ± 14 μg mL(-1), respectively). Moreover, both HME and AcE extracts scavenged NO (IC50 = 0...
September 9, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28899773/hepatoprotective-effects-of-raspberry-rubus-coreanus-miq-seed-oil-and-its-major-constituents
#9
Hui Teng, Qiyang Lin, Kang Li, Benyao Yuan, Hongbo Song, Lunzhao Yi, Ming-Chi Wei, Yu-Chiao Yang, Maurizio Battino, Carlos L Cespedes Acuña, Lei Chen, Jianbo Xiao
Raspberry seed is a massive byproduct of raspberry juice and wine but usually discarded. The present study employed a microwave-assisted method for extraction of raspberry seed oil (RSO). The results revealed that omega-6 fatty acids (linoleic acid and γ-linolenic acid) were the major constituents in RSO. Cellular antioxidant enzyme activity such as superoxide dismutase (SOD), glutathione peroxidase (GPx), and catalase (CAT) were investigated in HepG2 cells treated with RSO. Induction of the synthesis of several antioxidants in H2O2-exposed HepG2 cells was found...
September 9, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28899772/change-in-plasma-membrane-potential-of-rat-thymocytes-by-tert-butylhydroquinone-a-food-additive-possible-risk-on-lymphocytes
#10
Maki Takeda, Keisuke Oyama, Norio Kamemura, Kaori Kanemaru, Keizo Yuasa, Kumio Yokoigawa, Yasuo Oyama
Tertiary butylhydroquinone (TBHQ) is a food additive and has various beneficial actions under in vitro and in vivo experimental conditions. Therefore, it is necessary to collect additional data on the toxicity of TBHQ in order to avoid adverse effects during clinical applications. Changes in plasma membrane potential are associated with changes in physiological functions even in non-excitable cells such as lymphocytes. Thus, compounds that affect membrane potential may modify some lymphocytic functions. The effect of TBHQ on plasma membrane potential was examined in rat thymocytes using flow cytometric techniques...
September 9, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28893620/protective-effects-of-tea-red-wine-and-cocoa-in-diabetes-evidences-from-human-studies
#11
REVIEW
Maria Angeles Martin, Luis Goya, Sonia Ramos
Prevention of diabetes through the diet has recently received an increasing interest, and polyphenolic compounds, such as flavanols, have become important potential chemopreventive natural agents due to their proved benefits on health, with low toxicity and cost. Tea, red wine and cocoa are good sources of flavanols and these highly consumed foods might contribute to prevent diabetes. In this regard, there is increasing evidence for a protective effect of tea, red wine and cocoa consumption against this disorder...
September 8, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28893619/evaluation-of-the-effect-of-brominated-flame-retardants-on-hemoglobin-oxidation-and-hemolysis-in-human-erythrocytes
#12
Monika Jarosiewicz, Piotr Duchnowicz, Anna Włuka, Bożena Bukowska
Brominated flame retardants (BFRs) are widely used in many everyday products. Numerous studies have shown that BFRs can be released into the environment. Environmental pollution with these compounds raises concerns about their potentially adverse health effects. The aim of this study was to evaluate the effect of tetrabromobisphenol A (TBBPA), tetrabromobisphenol S (TBBPS), 2,4-dibromophenol (2,4-DBP), 2,4,6- tribromophenol (2,4,6-TBP) and pentabromophenol (PBP) on hemolysis induction and hemoglobin oxidation in human erythrocytes...
September 8, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28890115/rifm-fragrance-ingredient-safety-assessment-benzenepropanol-a-%C3%A3-dimethyl-cas-registry-number-56836-93-2
#13
A M Api, D Belsito, D Botelho, D Browne, M Bruze, G A Burton, J Buschmann, M L Dagli, M Date, W Dekant, C Deodhar, M Francis, A D Fryer, K Joshi, S La Cava, A Lapczynski, D C Liebler, D O'Brien, R Parakhia, A Patel, T M Penning, G Ritacco, J Romine, D Salvito, T W Schultz, I G Sipes, Y Thakkar, E H Theophilus, A K Tiethof, Y Tokura, S Tsang, J Wahler
No abstract text is available yet for this article.
September 7, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28888737/epigenetic-toxicity-of-environmental-chemicals-upon-exposure-during-development-bisphenol-a-and-valproic-acid-may-have-epigenetic-effects
#14
Maky Ideta-Otsuka, Katsuhide Igarashi, Minoru Narita, Yoko Hirabayashi
As of 2017, chemical substances registered in Chemical Abstracts Service (CAS) exceed 100 million, which is increasing yearly. The safety of chemical substances is adequately managed by regulations based on scientific information from toxicity tests. However, there are substances reported to have "biological effects" even though they are judged to be nontoxic in conventional toxicity tests. Therefore, it is necessary to consider a new concept on toxicity, "epigenetic toxicity". In this review, we explain about epigenetic toxicity using bisphenol A (BPA) and valproic acid (VPA) as examples...
September 6, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28888736/distinct-urinary-metabolite-profiles-of-two-pharmacologically-active-n-methylanthranilates-three-approaches-to-xenobiotic-metabolite-identification
#15
Niko S Radulović, Ana B Miltojević, Nikola M Stojanović, Pavle J Randjelović
Two volatile alkaloids, isopropyl N-methylanthranilate (IMA) and methyl N-methylanthranilate (MMA), present in the human diet and cosmetic products, were recently demonstrated to possess important pharmacological activities. While MMA is considered to be phototoxic, there is scarce data on the toxicity of IMA. Herein, we analyzed urinary metabolites of IMA and MMA in rats (200 mg kg(-1), i.p, 7 days) by combining three different approaches: 1) preparative chromatography, 2) synthesis, and 3) SPR. The preparative approach, Sephadex LH-20 chromatography of the extract of urine samples of IMA treated animals, in conjunction with NMR, enabled the identification of 16 different anthranilate derivatives, among which products of the aromatic core hydroxylation (isopropyl 5-hydroxy-N-methylanthranilate, isopropyl 5-hydroxyantranilate, isopropyl 3-hydroxyantranilate) were the major ones...
September 6, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28888735/uplc-ms-ms-analysis-of-ochratoxin-a-metabolites-produced-by-caco-2-and-hepg2-cells-in-a-co-culture-system
#16
Cyndia A González-Arias, Sonia Marín, Aurora E García-Rojas, Vicente Sanchis, Antonio J Ramos
Ochatoxin A (OTA) is one of the most important mycotoxins based on its toxicity. The oral route is the main gateway of entry of OTA into the human body, and specialized epithelial cells constitute the first barrier. The present study investigated the in vitro cytotoxic effect of OTA (5, 15 and 45 μM) and production of OTA metabolities in Caco-2 and HepG2 cells using a co-culture Transwell System to mimic the passage through the intestinal epithelium and hepatic metabolism. The results derived from MTS cell viability assays and transepithelial electrical resistance measurements showed that OTA was slightly cytotoxic at the lowest concentration at 3 h, but significant toxicity was observed at all concentrations at 24 h...
September 6, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28888734/influence-of-the-container-on-the-consumption-of-cosmetic-products
#17
M P Gomez-Berrada, A S Ficheux, M Galonnier, J E Rolfo, A Rielland, S Guillou, D De Javel, A C Roudot, P J Ferret
The container, also known as primary package or inner package, could be defined as the packaging designed to come into direct contact with the cosmetic product. To author's knowledge, no study was available regarding the effect of the primary package on the consumption of cosmetic products. The aim of the study was to assess the impact of the container on the consumption of three cosmetic products widely used, i.e. shampoo, shower gel and emollient cream. The three products were contained in a tube with a flip top cap and in a bottle with a pump...
September 6, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28888733/exposure-risk-assessment-to-ochratoxin-a-through-consumption-of-juice-and-wine-considering-the-effect-of-steam-extraction-time-and-vinification-stages
#18
Bruna Dachery, Flávio Fonseca Veras, Lucas Dal Magro, Vitor Manfroi, Juliane Elisa Welke
The goals of this study were (i) to verify the effect of steam extraction used in juice production and the stages of vinification on the ochratoxin A (OTA) levels found in grapes naturally contaminated, and (ii) evaluate the risk of exposure to this toxin when the daily consumption of juice and wine is followed to prevent cardiovascular disease. OTA-producing fungi were isolated from Cabernet Sauvignon, Moscato Itálico and Concord grapes harvested from the same vineyard and intended to produce red wine, white wine and juice, respectively...
September 6, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28888732/are-all-phytochemicals-useful-in-the-preventing-of-dna-damage
#19
REVIEW
Merve Bacanlı, Sevtap Aydın, A Ahmet Başaran, Nurşen Başaran
Phytochemicals derived from natural plants have been used commonly for the prevention and/or treatment of different diseases due to the belief of their safety. Many plant species synthesize toxic chemicals. New natural chemicals are being discovered but their toxic effects are unknown. Phytochemicals have been regarded as possible antioxidants. But on the other hand it is suggested that various phenolic antioxidants can display pro-oxidant properties at high doses. In this review, the role of some phytochemicals (epigallocathecin gallate, carvacrol, galangin, limonene, lycopene, naringin, puerarin, terpinene, thymol and ursolic acid) on the prevention of DNA damage will be discussed...
September 6, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28887090/vitamin-c-partially-prevents-reproductive-damage-in-adult-male-rats-exposed-to-rosuvastatin-during-prepuberty
#20
Gabriel Adan Araújo Leite, Thamiris Moreira Figueiredo, Tainá Louise Pacheco, Marciana Sanabria, Patrícia Villela E Silva, Fábio Henrique Fernandes, Wilma De Grava Kempinas
Pediatric obesity is closely associated with dyslipidemias and environmental factors, such as diet and lack of physical exercises, which may alter lipid profile in children. Rosuvastatin decreases serum total cholesterol and triglycerides concentrations. Vitamin C (ascorbic acid) plays an important role on sperm integrity and fertility. Juvenile male rats were distributed into six experimental groups that received saline solution 0.9%, 3 or 10 mg/kg/day of rosuvastatin, 150 mg/day of ascorbic acid, or 3 or 10 mg/kg/day of rosuvastatin co-administered with 150 mg/day of ascorbic acid from PND23 until PND53 and then the rats were maintained until sexual maturity...
September 6, 2017: Food and Chemical Toxicology
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