journal
MENU ▼
Read by QxMD icon Read
search

Toxicology

journal
https://www.readbyqxmd.com/read/27916585/perinatal-exposure-to-glyphosate-based-herbicide-alters-the-thyrotrophic-axis-and-causes-thyroid-hormone-homeostasis-imbalance-in-male-rats
#1
Janaina Sena de Souza, Marina Malta Letro Kizys, Rodrigo Rodrigues da Conceição, Gabriel Glebocki, Renata Marino Romano, Tania Maria Ortiga-Carvalho, Gisele Giannocco, Ismael Dale Cotrim Guerreiro da Silva, Magnus Regios Dias da Silva, Marco Aurélio Romano, Maria Izabel Chiamolera
Glyphosate-based herbicides (GBHs) are widely used in agriculture. Recently, several animal and epidemiological studies have been conducted to understand the effects of these chemicals as an endocrine disruptor for the gonadal system. The aim of the present study was to determine whether GBHs could also disrupt the hypothalamic-pituitary-thyroid (HPT) axis. Female pregnant Wistar rats were exposed to a solution containing GBH Roundup(®)Transorb (Monsanto). The animals were divided into three groups (control, 5mg/kg/day or 50mg/kg/day) and exposed from gestation day 18 (GD18) to post-natal day 5 (PND5)...
December 1, 2016: Toxicology
https://www.readbyqxmd.com/read/27915097/effects-of-chronic-lead-exposure-on-bone-mineral-properties-in-femurs-of-growing-rats
#2
Pedro Álvarez-Lloret, Ching Ming Lee, María Inés Conti, Antonela Romina Terrizzi, Santiago González-López, María Pilar Martínez
Lead exposure has been associated with several defective skeletal growth processes and bone mineral alterations. The aim of the present study is to make a more detailed description of the toxic effects of lead intoxication on bone intrinsic material properties as mineral composition, morphology and microstructural characteristics. For this purpose, Wistar rats were exposed (n=12) to 1000ppm lead acetate in drinking water for 90days while control group (n=8) were treated with sodium acetate. Femurs were examined using inductively coupled plasma optical emission spectrometry (ICP-OES), Attenuated Total Reflection Fourier transform infrared spectroscopy (ATR-FTIR), X-ray diffraction (XRD), and micro-Computed Tomography (μCT)...
November 30, 2016: Toxicology
https://www.readbyqxmd.com/read/27908630/non-linear-dose-response-of-aluminium-hydroxide-adjuvant-particles-selective-low-dose-neurotoxicity
#3
Guillemette Crépeaux, Housam Eidi, Marie-Odile David, Yasmine Baba-Amer, Eleni Tzavara, Bruno Giros, François-Jérôme Authier, Christopher Exley, Christopher A Shaw, Josette Cadusseau, Romain K Gherardi
Aluminium (Al) oxyhydroxide (Alhydrogel(®)), the main adjuvant licensed for human and animal vaccines, consists of primary nanoparticles that spontaneously agglomerate. Concerns about its safety emerged following recognition of its unexpectedly long-lasting biopersistence within immune cells in some individuals, and reports of chronic fatigue syndrome, cognitive dysfunction, myalgia, dysautonomia and autoimmune/inflammatory features temporally linked to multiple Al-containing vaccine administrations. Mouse experiments have documented its capture and slow transportation by monocyte-lineage cells from the injected muscle to lymphoid organs and eventually the brain...
November 28, 2016: Toxicology
https://www.readbyqxmd.com/read/27894940/changes-in-the-mrna-expression-of-structural-proteins-hormone-synthesis-and-secretion-from-bovine-placentome-sections-after-ddt-and-dde-treatment
#4
A Wojciechowska, J Mlynarczuk, J Kotwica
Disorders in the barrier function and secretory activity of the placenta can be caused by xenobiotics (XB) present in the environment and their accumulation in tissues of living organisms. Thus, the aim of this study was to investigate the effect of 1,1,1-trichloro-2,2,-bis-4-chlorophenyl-ethane (DDT) and its metabolite 1,1-dichloro-2,2-bis-4-chlorophenyl-ethene (DDE) (for 24 or 48h) at doses of 1, 10 or 100ng/ml on the function of cow placentome sections in the second trimester of pregnancy. DDT and DDE affected neither (P>0...
November 25, 2016: Toxicology
https://www.readbyqxmd.com/read/27889505/candesartan-ameliorates-arsenic-induced-hypertensive-vascular-remodeling-by-regularizing-angiotensin-ii-and-tgf-beta-signaling-in-rats
#5
Maibam Wanta Khuman, Sankaran Kutty Harikumar, Abdul Sadam, Manickam Kesavan, Vattaparambil Sukumaran Susanth, Subhashree Parida, Karam Pal Singh, Souvendra Nath Sarkar
Arsenic exposure can cause several cardiovascular diseases, including hypertension, atherosclerosis and microvascular disease. Earlier, we reported that arsenic-mediated enhancement of angiotensin II (AngII) signaling can impair vascular physiology. Here, we investigated whether the AT1 receptor (AT1R) blocker candesartan can ameliorate the arsenic-induced hypertensive vascular remodeling in rats and whether the amelioration could relate to attenuation in vascular AngII and TGF-β signaling. Rats were exposed to sodium arsenite (50ppm) through drinking water for 90 consecutive days...
November 23, 2016: Toxicology
https://www.readbyqxmd.com/read/27884721/comparison-of-xenobiotic-metabolising-human-porcine-rodent-and-piscine-cytochrome-p450
#6
REVIEW
Viktoriia Burkina, Martin Krøyer Rasmussen, Nadezhda Pilipenko, Galia Zamaratskaia
Cytochrome P450 proteins (CYP450s) are present in most domains of life and play a critical role in the metabolism of endogenous compounds and xenobiotics. The effects of exposure to xenobiotics depend heavily on the expression and activity of drug-metabolizing CYP450s, which is determined by species, genetic background, age, gender, diet, and exposure to environmental pollutants. Numerous reports have investigated the role of different vertebrate CYP450s in xenobiotic metabolism. Model organisms provide powerful experimental tools to investigate Phase I metabolism...
November 22, 2016: Toxicology
https://www.readbyqxmd.com/read/27876672/is-there-a-human-health-risk-associated-with-indirect-exposure-to-perfluorinated-carboxylates-pfcas
#7
Amy A Rand, Scott A Mabury
The production and widespread use of poly- and perfluorinated alkyl substances (PFAS) has led to their presence in environment, wildlife, and humans. Particularly, the perfluorinated carboxylates (PFCAs) are pervasive throughout the world and have been found at ng/mL concentrations in human blood. PFCAs, especially those having longer carbon chain lengths (≥C6), are associated with developmental and hormonal effects, immunotoxicity, and promote tumor growth in rodents through their role as PPARα agonists...
November 19, 2016: Toxicology
https://www.readbyqxmd.com/read/27876671/relevance-of-the-rat-lung-tumor-response-to-particle-overload-for-human-risk-assessment-update-and-interpretation-of-new-data-since-ilsi-2000
#8
REVIEW
D B Warheit, R Kreiling, L S Levy
The relevance of particle-overload related lung tumors in rats for human risk assessment following chronic inhalation exposures to poorly soluble particulates (PSP) has been a controversial issue for more than three decades. In 1998, an ILSI (International Life Sciences) Working Group of health scientists was convened to address this issue of applicability of experimental study findings of lung neoplasms in rats for lifetime-exposed production workers to PSPs. A full consensus view was not reached by the Workshop participants, although it was generally acknowledged that the findings of lung tumors in rats following chronic inhalation, particle-overload PSP exposures occurred only in rats and no other tested species; and that there was an absence of lung cancers in PSP-exposed production workers...
November 19, 2016: Toxicology
https://www.readbyqxmd.com/read/27866839/markers-for-toxicity-to-hepg2-exposed-to-cadmium-sulphide-quantum-dots-damage-to-mitochondria
#9
Laura Paesano, Alessio Perotti, Annamaria Buschini, Cecilia Carubbi, Marta Marmiroli, Elena Maestri, Salvatore Iannotta, Nelson Marmiroli
Interaction of living organisms with quantum dots (QDs) is certainly more focused on environment and occupational exposure associated with production and release or disposal. Here, the transcription of genes involved in mitochondrial organization and function in HepG2 cells exposed to cadmium sulphide (CdS) QDs has been profiled to highlight biomarkers of exposure and effect to be tested for other cadmium based QDs. At low concentrations, exposure to CdS QDs induced only minor damage to nuclear DNA, and none to mitochondrial DNA...
November 17, 2016: Toxicology
https://www.readbyqxmd.com/read/27865893/sex-and-genetic-differences-in-the-effects-of-acute-diesel-exhaust-exposure-on-inflammation-and-oxidative-stress-in-mouse-brain
#10
Toby B Cole, Jacki Coburn, Khoi Dao, Pam Roqué, Yu-Chi Chang, Vrinda Kalia, Tomas R Guilarte, Jennifer Dziedzic, Lucio G Costa
In addition to increased morbidity and mortality caused by respiratory and cardiovascular diseases, air pollution may also contribute to central nervous system (CNS) diseases. Traffic-related air pollution is a major contributor to global air pollution, and diesel exhaust (DE) is its most important component. DE contains more than 40 toxic air pollutants and is a major constituent of ambient particulate matter (PM), particularly of ultrafine-PM. Limited information suggests that exposure to DE may cause oxidative stress and neuroinflammation in the CNS...
November 16, 2016: Toxicology
https://www.readbyqxmd.com/read/27851905/inhalation-dosimetry-modeling-provides-insights-into-regional-respiratory-tract-toxicity-of-inhaled-diacetyl
#11
Joseph A Cichocki, John B Morris
Vapor dosimetry models provide a means of assessing the role of delivered dose in determining the regional airway response to inspired vapors. A validated hybrid computational fluid dynamics physiologically based pharmacokinetic model for inhaled diacetyl has been developed to describe inhaled diacetyl dosimetry in both the rat and human respiratory tracts. Comparison of the distribution of respiratory tract injury with dosimetry estimates provides strong evidence that regional delivered dose rather than regional airway tissue sensitivity to diacetyl-induced injury is the critical determinant of the regional respiratory tract response to this water soluble reactive vapor...
November 13, 2016: Toxicology
https://www.readbyqxmd.com/read/27845169/graphene-oxide-quantum-dots-disrupt-autophagic-flux-by-inhibiting-lysosome-activity-in-gc-2-and-tm4-cell-lines
#12
Xiaoli Ji, Bo Xu, Mengmeng Yao, Zhilei Mao, Yuqing Zhang, Guofeng Xu, Qiusha Tang, Xinru Wang, Yankai Xia
Graphene oxide quantum dots (GOQDs) have broad application prospects in many areas including bioimaging, drug delivery, DNA cleavage system, sensors and photocatalyst. Recently, increasing concerns have been raised about their biocompatibility, but studies about the effects of GOQDs on male reproductive system are still lacking. In this work, we explored the effects and molecular mechanisms of GOQDs on GC-2 and TM4 cells. We found autophagosome accumulation in GC-2 and TM4 cells after GOQDs treatment. Both LC3-II/LC3-I ratio and p62 levels increased, and the chloroquine-induced accumulation of LC3-II didn't enhance in the presence of GOQDs, which indicated that GOQDs blocked autophagic flux...
November 12, 2016: Toxicology
https://www.readbyqxmd.com/read/27818223/hesperitin-derivative-11-suppress-hepatic-stellate-cell-activation-and-proliferation-by-targeting-pten-akt-pathway
#13
Wan-Xia Li, Xin Chen, Yang Yang, Hui-Min Huang, Hai-di Li, Cheng Huang, Xiao-Ming Meng, Jun Li
Hesperitin derivative (HD-11) is a monomeric compound derived from Hesperidin, which is a naturally occurring flavanone glycoside that exerts extensive clinical effects such as anti-inflammatory, anti-oxidant and anti-angiogenic. However, the role and fundamental mechanism of HD-11 in hepatic fibrosis is still unrevealed. In this study, HD-11 not only alleviates ECM deposition in rats with liver fibrosis, but also reduces the expression of α-SMA and col1a1 in TGF-β1-induced HSC-T6 cells. Moreover, it was demonstrated that HD-11 significantly promoted the expression of PTEN in vivo and in vitro...
November 3, 2016: Toxicology
https://www.readbyqxmd.com/read/27765685/2-3-7-8-tetrachlorodibenzo-p-dioxin-tcdd-role-in-hematopoiesis-and-in-hematologic-diseases-a-critical-review
#14
REVIEW
Nicola Stefano Fracchiolla, Claudio Annaloro, Francesca Guidotti, Bruno Fattizzo, Agostino Cortelezzi
Dioxin exposure and its effect on hematopoiesis and cancer have been largely investigated in both human and non-human settings. Here we systematically reviewed literature to address the question of what we know about TCDD biology and exposure. Most effects are due to TCDD interaction with a receptor of xenobiotics called AHR, which is ubiquitously represented and also works on hematopoietic myeloid and lymphoid stem cells, inducing proliferation and stem cell release from bone marrow to peripheral circulation...
October 17, 2016: Toxicology
https://www.readbyqxmd.com/read/27765683/persistent-transcriptional-responses-show-the-involvement-of-feed-forward-control-in-a-repeated-dose-toxicity-study
#15
Terezinha M Souza, Linda Rieswijk, Twan van den Beucken, Jos Kleinjans, Danyel Jennen
Chemical carcinogenesis, albeit complex, often relies on modulation of transcription through activation or repression of key transcription factors. While analyzing extensive networks may hinder the biological interpretation, one may focus on dynamic network motifs, among which persistent feed-forward loops (FFLs) are known to chronically influence transcriptional programming. Here, to investigate the relevance a FFL-oriented approach in depth, we have focused on aflatoxin B1-induced transcriptomic alterations during distinct states of exposure (daily administration during 5 days followed by a non-exposed period) of human hepatocytes, by exploring known interactions in human transcription...
October 17, 2016: Toxicology
https://www.readbyqxmd.com/read/27751755/all-trans-retinal-dimer-formation-alleviates-the-cytotoxicity-of-all-trans-retinal-in-human-retinal-pigment-epithelial-cells
#16
Jie Li, Yanli Zhang, Xianhui Cai, Qingqing Xia, Jingmeng Chen, Yi Liao, Zuguo Liu, Yalin Wu
Effective clearance of all-trans-retinal (atRAL) from retinal pigment epithelial (RPE) cells is important for avoiding its cytotoxicity. However, the metabolism of atRAL in RPE cells is poorly clarified. The present study was designed to analyze metabolic products of atRAL and to compare the cytotoxicity of atRAL versus its derivative all-trans-retinal dimer (atRAL-dimer) in human RPE cells. We found that all-trans-retinol (atROL) and a mixture of atRAL condensation metabolites including atRAL-dimer and A2E were generated after incubating RPE cells with atRAL for 6h, and the amount of atRAL-dimer was significantly higher than that of A2E...
October 14, 2016: Toxicology
https://www.readbyqxmd.com/read/27725195/cardiovascular-health-effects-of-oral-and-pulmonary-exposure-to-multi-walled-carbon-nanotubes-in-apoe-deficient-mice
#17
Daniel V Christophersen, Nicklas R Jacobsen, Maria H G Andersen, Shea P Connell, Kenneth K Barfod, Morten B Thomsen, Mark R Miller, Rodger Duffin, Jens Lykkesfeldt, Ulla Vogel, Håkan Wallin, Steffen Loft, Martin Roursgaard, Peter Møller
Exposure to high aspect ratio nanomaterials, such as multi-walled carbon nanotubes (MWCNTs) may be associated with increased risk of atherosclerosis, pulmonary disease, and cancer. In the present study, we investigated the cardiovascular and pulmonary health effects of 10 weeks of repeated oral or pulmonary exposures to MWCNTs (4 or 40μg each week) in Apolipoprotein E-deficient (ApoE(-/-)) mice fed a Western-type diet. Intratracheal instillation of MWCNTs was associated with oxidative damage to DNA in lung tissue and elevated levels of lipid peroxidation products in plasma, whereas the exposure only caused a modest pulmonary inflammation in terms of increased numbers of lymphocytes in bronchoalveolar lavage fluid...
October 8, 2016: Toxicology
https://www.readbyqxmd.com/read/27720690/aluminum-trichloride-induces-bone-impairment-through-tgf-%C3%AE-1-smad-signaling-pathway
#18
Xudong Sun, Jianyu Liu, Cuicui Zhuang, Xu Yang, Yanfei Han, Bing Shao, Miao Song, Yanfei Li, Yanzhu Zhu
Aluminum (Al) is recognized worldwide as serious inorganic contaminants. Exposure to Al is associated with low BMD and an increased risk of osteoporosis. However, the precise molecular mechanisms remains unclear. Thus, in this study, rats were orally exposed to 0 (control group, CG) and 0.4g/L AlCl3 (AlCl3 treated group, AG) in drinking water for 120days; osteoblasts were treated with AlCl3 (0.12mg/mL) and/or TGF-β1 (4.5ng/mL) for 24h. We found that AlCl3 decreased the BMD, damaged femoral ultrastructure, decreased the activities of GSH-Px and SOD, and increased the levels of ROS and MDA in bone, decreased the activity of B-ALP and content of PINP, and increased the activity of TRACP-5b and content of NTX-I in serum, decreased mRNA expressions of TGF-β1, TβRI, TβRII and Smad4, protein expressions of TGF-β1, p-Smad2/3 and Smad2/3/4 complex, and increased Smad7 mRNA expression in bone and in osteoblasts...
October 5, 2016: Toxicology
https://www.readbyqxmd.com/read/27717837/an-integrative-view-of-cisplatin-induced-renal-and-cardiac-toxicities-molecular-mechanisms-current-treatment-challenges-and-potential-protective-measures
#19
REVIEW
George J Dugbartey, Luke J Peppone, Inge A M de Graaf
Cisplatin is currently one of the most widely-used chemotherapeutic agents against various malignancies. Its clinical application is limited, however, by inherent renal and cardiac toxicities and other side effects, of which the underlying mechanisms are only partly understood. Experimental studies show cisplatin generates reactive oxygen species, which impair the cell's antioxidant defense system, causing oxidative stress and potentiating injury, thereby culminating in kidney and heart failure. Understanding the molecular mechanisms of cisplatin-induced renal and cardiac toxicities may allow clinicians to prevent or treat this problem better and may also provide a model for investigating drug-induced organ toxicity in general...
October 4, 2016: Toxicology
https://www.readbyqxmd.com/read/27640744/mechanisms-underlying-effect-of-the-mycotoxin-cytochalasin-b-on-induction-of-cytotoxicity-modulation-of-cell-cycle-ca-2-homeostasis-and-ros-production-in-human-breast-cells
#20
Hong-Tai Chang, Chiang-Ting Chou, I-Shu Chen, Chia-Cheng Yu, Ti Lu, Shu-Shong Hsu, Pochuen Shieh, Chung-Ren Jan, Wei-Zhe Liang
Cytochalasin B, a cell-permeable mycotoxin isolated from the fungus Phoma spp., shows a wide range of biological effects, among which its potent antitumor activity has raised great interests in different models. However, the cytotoxic activity of cytochalasin B and its underlying mechanisms have not been elucidated in breast cells. This study examined the effect of cytochalasin B on MCF 10A human breast epithelial cells and ZR-75-1 human breast cancer cells. Cytochalasin B (10-20μM) concentration-dependently induced cytotoxicity, cell cycle arrest, and [Ca(2+)]i rises in ZR-75-1 cells but not in MCF 10A cells...
October 1, 2016: Toxicology
journal
journal
23083
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"