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Environmental Toxicology and Pharmacology

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https://www.readbyqxmd.com/read/28292652/synthesis-and-toxicity-assessment-of-3-oxobutanamides-against-human-lymphocytes-and-isolated-mitochondria
#1
Nima Razzaghi-Asl, Enaytollah Seydi, Radin Alikhani, Saba Rezvani, Ramin Miri, Ahmad Salimi
To reduce costly late-phase compound scrubbing, there has been an increased focus on assessing compounds within in vitro assays that predict properties of human safety liabilities, before preclinical in vivo studies. The aim of our study was to answer the questions that whether the toxicity risk of a series of 3-oxobutanamide derivatives could be predicted by using of human lymphocytes and their isolated mitochondria. Using biochemical and flow cytometry assessments, we demonstrated that exposure of lymphocytes and isolated mitochondria to five 3-oxobutanamide derivatives (1-5) did not exhibit remarkable toxicity at low concentrations (50-500μM) but toxicity could be observed at high concentrations (1000 and 2000μM), particularly for N-(5-(4-bromophenyl)-3-isoxazolyl)-3-oxobutanamide (4) and N-(2-benzothiazolyl)-3-oxo butanamide (5)...
March 7, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28327436/investigating-the-affinity-of-bde154-and-3oh-bde154-with-hsa-experimental-and-simulation-validation
#2
Wu Yang, Lulu Yang, Zhongsheng Yi, Zhiwei Wu, Jinfang Nie, Aiqian Zhang
The physicochemical properties of polybrominated diphenyl ethers are important for modeling their transport, but these data are often missing. Here, satisfactory bioactivity results were obtained using human serum albumin as the carrier, 2,2',4,4',5,6'-hexabromodiphenyl ether (BDE154) and 3-hydroxy-2,2',4,4', 5,6'-hexabromodiphenyl ether (3OH-BDE154) as the ligands, using UV-visible absorbance, fluorescence, circular dichroism, molecular docking, and molecular dynamics methods. The interactions between human serum albumin and BDE154 or 3OH-BDE154 were verified, consistent with the static quenching procedure...
March 6, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28292651/human-exposure-to-endocrine-disrupting-chemicals-effects-on-the-male-and-female-reproductive-systems
#3
REVIEW
Stavros Sifakis, Vasilis P Androutsopoulos, Aristeidis M Tsatsakis, Demetrios A Spandidos
Endocrine disrupting chemicals (EDCs) comprise a group of chemical compounds that have been examined extensively due to the potential harmful effects in the health of human populations. During the past decades, particular focus has been given to the harmful effects of EDCs to the reproductive system. The estimation of human exposure to EDCs can be broadly categorized into occupational and environmental exposure, and has been a major challenge due to the structural diversity of the chemicals that are derived by many different sources at doses below the limit of detection used by conventional methodologies...
March 6, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28286322/secreted-phosphoprotein-24kd-spp24-inhibits-growth-of-hepatocellular-carcinoma-in-vivo
#4
Lifeng Lao, Jia Shen, Haijun Tian, Guibin Zhong, Samuel S Murray, Jeffrey C Wang
Several studies have shown that secreted phosphoprotein 24kD (Spp24) inhibits tumor growth. However, the effects of spp24 on hepatocellular carcinoma are not quite clear. In this study, we observed the inhibitory effect of spp24 on hepatocellular carcinoma in vivo. A subcutaneous hepatocellular carcinoma mice model was established by using Hep G2 cells. After sacrifice at day 40, tumor growth was assessed and tumor cell apoptosis and tumor cells proliferation were assessed by TUNEL assay and immunochemical analysis, respectively...
March 4, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28282589/lower-concentrations-of-receptor-for-advanced-glycation-end-products-and-epiregulin-in-amniotic-fluid-correlate-to-chemically-induced-cleft-palate-in-mice
#5
Xinhuan Wang, Jingjing Zhu, Yanjun Fang, Zhuan Bian, Liuyan Meng
This study investigated the correlation between differentially expressed proteins in amniotic fluid (AF) and cleft palate induced by all-trans retinoic acid (atRA), and 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) in mice. Seven proteins were differentially expressed at embryonic day (E) 16.5 in atRA and control groups as revealed by label-based mouse antibody array. Enzyme-linked immunosorbent assay was further used to detect the expression levels of these proteins in AF from E13.5 to E16.5 in atRA, TCDD, and control groups...
February 28, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28262508/the-role-of-ntcp-oatp2-bsep-and-mrp2-in-liver-injury-induced-by-dioscorea-bulbifera-l-and-diosbulbin-b-in-mice
#6
Xiao-Yu Qu, Li-Na Tao, Si-Xi Zhang, Jing-Meng Sun, Jun-Qi Niu, Yan-Hua Ding, Yan-Qing Song
Dioscorea bulbifera L. (DB) is a traditional Chinese herb used in thyroid disease and cancer. However, the clinical use of DB remains a challenge due to its hepatotoxicity, which is caused, in part, by the presence of Diosbulbin B (DIOB), a toxin commonly found in DB extracts. As abnormal expression of hepatobiliary transporters plays an important role in drug-induced liver injury, we assessed the hepatotoxicity induced by DB and DIOB, and explored their impacts on hepatobiliary transporter expression levels...
February 28, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28262510/regeneration-of-glutathione-by-%C3%AE-lipoic-acid-via-nrf2-are-signaling-pathway-alleviates-cadmium-induced-hepg2-cell-toxicity
#7
Jiayu Zhang, Xue Zhou, Wenbo Wu, Jiachun Wang, Hong Xie, Zhigang Wu
Alpha-lipoic acid (α-LA) is an important antioxidant that is capable of regenerating other antioxidants, such as glutathione (GSH). However, the underlying molecular mechanism by which α-LA regenerates GSH remains poorly understood. The current study aimed to investigate whether α-LA regenerates GSH by activation of Nrf2 to alleviate cadmium-induced cytotoxicity in HepG2 cells. In the present study, we found that cadmium induced cell death by depletion of GSH through inactivation of Nrf2. Addition of α-LA to cadmium-treated cells reactivated Nrf2 and regenerated GSH through elevating the Nrf2-downstream genes γ-glutamate-cysteine ligase (γ-GCL) and GR, both of which are key enzymes for GSH synthesis...
February 27, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28273564/hepatotoxicity-and-proteomic-mechanism-of-di-n-butyl-di-4-chlorobenzohydroxamato-tin-iv-dbdct-in-vivo
#8
Li Tang, Jie-Ran Luo, Yun-Lan Li, Rui Ge, Qing-Shan Li
Di-n-butyl-di-(4-chlorobenzohydroxamato)tin(IV) (DBDCT) is an anti-tumour organotin(IV) compound with hepatotoxicity. To investigate the hepatotoxicity and mechanisms of DBDCT in vivo, proteomic technology 2D gel combined with MALDI-TOF-MS was used in our research. Results indicated that DBDCT increased AST, AKP and ACP activities and decreased ALT activity. Further, sporadic eosinophilic changes and nuclear pyknosis were visible in hepatic pathological observation. Proteomic analysis showed that twenty-two proteins involved in amino acid, nucleic acid, carbohydrate and lipid metabolism, stress response, multicellular organism development and cell apoptosis were differentially expressed and identified...
February 24, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28262509/tyrosine-assisted-size-controlled-synthesis-of-silver-nanoparticles-and-their-catalytic-in-vitro-cytotoxicity-evaluation
#9
Sireesh Babu Maddinedi, Badal Kumar Mandal, Kiran Kumar Anna
A simple, green approach for the size controllable preparation of silver nanoparticles (SNPs) using tyrosine as reducing and capping agent is shown here. The size of SNPs is controlled by varying the pH of tyrosine solution. The as synthesized SNPs are characterized by using XRD, UV-Visible, DLS, TEM and SAED. Zeta potential measurements revealed the stability of tyrosine capped silver nanocolloids. Furthermore, catalytic activity studies concluded that the smaller SNPs acts as good catalyst and the catalytic activity depends on size of the nanoparticles...
February 23, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28262431/chrysin-and-baicalin-in-diabetic-nephropathy
#10
LETTER
Salvatore Chirumbolo, Geir Bjørklund
No abstract text is available yet for this article.
February 22, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28259069/effects-of-octylphenol-on-the-expression-of-star-cyp17-and-cyp19-in-testis-of-rana-chensinensis
#11
Yao Bai, Xin-Yi Li, Zhi-Jun Liu, Yu-Hui Zhang
It has been proposed that a decline in sperm quality is associated with exposure to environmental chemicals with estrogenic activity. Seeking possible explanations for this effect, this study investigated the effects of octylphenol (OP) on the synthesis of steroid hormones in amphibian. Rana chensinensis were exposed to 10(-8), 10(-7) and 10(-6)mol/L OP after 10, 20, 30 and 40 days. The cDNA fragments of StAR (274bp), CYP17 (303bp) and CYP19 (322bp) were cloned. In situ hybridization and immunohistochemistry revealed that positive signals of StAR, CYP17, CYP19 mRNA and proteins mainly in the Leydig cells of testes...
February 21, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28238700/acute-toxicity-biochemical-toxicity-and-genotoxicity-caused-by-1-butyl-3-methylimidazolium-chloride-and-1-butyl-3-methylimidazolium-tetrafluoroborate-in-zebrafish-danio-rerio-livers
#12
Cheng Zhang, Yuting Shao, Lusheng Zhu, Jinhua Wang, Jun Wang, Yingying Guo
The present study examined the potential toxicity of 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) and 1-butyl-3- methylimidazolium tetrafluoroborate ([Bmim]BF4) in the liver cells of zebrafish (Danio rerio) with different doses (20-160mg/L) on 7 and 14days. The effects of [Bmim]Cl and [Bmim]BF4 on acute toxicity, reactive oxygen species (ROS), antioxidant enzymes, glutathione S-transferase (GST), malondialdehyde (MDA), and DNA damage degree in livers of zebrafish were determined. The 50% lethal concentration (LC50) values after a 96-h exposure to [Bmim]Cl and [Bmim]BF4 were 632...
February 21, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28238699/effect-of-ammonia-on-the-gene-expression-levels-of-the-freshwater-cyclopoid-eucyclops-serrulatus
#13
Tiziana Di Lorenzo, Marco Melita, Marco Cifoni, Diana M P Galassi, Alessio Iannucci, Stefano Biricolti, Massimo Gori, Mariella Baratti
Ammonia pollution is a critical issue in Europe, since more than half of the European freshwater bodies actually fail to meet EU quality standards for this chemical. In this study, the response of stress-related genes to a sublethal ammonia concentration has been investigated in the adults of the freshwater cyclopoid Eucyclops serrulatus. Two short-term exposures (12h and 24h) at 12mg/L NH4(+) have been tested. Results indicate that 12mg/L NH4(+) causes a significant increase in the expression of some proteins, namely CAT, HSP90 and HSP40, suggesting an activation of the protecting antioxidant system after both 12h and 24h...
February 21, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28236584/zinc-oxide-nanoparticles-hepatotoxicity-histological-and-histochemical-study
#14
Mansour I Almansour, Mosaid A Alferah, Ziad A Shraideh, Bashir M Jarrar
Zinc oxide nanoparticles (ZnO NPs) are widely used in industry and cosmetic products with promising investment in medical diagnosis and treatment. However, these particles may reveal a high potential risk for human health with no information about hepatotoxicity that might be associated with their exposure. The present work was carried out to investigate the histological and histochemical alterations induced in the hepatic tissues by naked 35nm ZnO NPs. Male Wistar albino rats were exposed to ZnO NPs at a daily dose of 2mg/kg for 21days...
February 16, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28233699/sinapic-acid-ameliorate-cadmium-induced-nephrotoxicity-in-vivo-possible-involvement-of-oxidative-stress-apoptosis-and-inflammation-via-nf-%C3%AE%C2%BAb-downregulation
#15
Mushtaq Ahmad Ansari, Mohammad Raish, Ajaz Ahmad, Khalid M Alkharfy, Sheikh Fayaz Ahmad, Sabry M Attia, Abdulaziz M S Alsaad, Saleh A Bakheet
Cadmium (CD), an environmental and industrial pollutant, generates reactive oxygen species (ROS) and NOS responsible for oxidative and nitrosative stress that can lead to nephrotoxic injury, including proximal tubule and glomerulus dysfunction. Sinapic acid (SA) has been found to possess potent antioxidant and anti-inflammatory effects in vitro and in vivo. We aimed to examine the nephroprotective, anti-oxidant, anti-inflammatory, and anti-apoptotic effects of SA against CD-induced nephrotoxicity and its underlying mechanism...
February 15, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28233701/acetyl-l-carnitine-partially-prevents-benzene-induced-hematotoxicity-and-oxidative-stress-in-c3h-he-mice
#16
Rongli Sun, Juan Zhang, Haiyan Wei, Xing Meng, Qin Ding, Fengxia Sun, Meng Cao, Lihong Yin, Yuepu Pu
Benzene is an environmental pollutant and occupational toxicant which induces hematotoxicity. Our previous metabonomics study suggested that acetyl-l-carnitine (ALCAR) decreased in the mouse plasma and bone marrow (BM) cells due to benzene exposure. In the present study, the topic on whether ALCAR influences hematotoxicity caused by benzene exposure was explored. Thirty-two male C3H/He mice were divided into four groups: control group (C: vehicle, oil), benzene group (150mg/kg body weight (b.w.) benzene), benzene+A1 group (150mg/kg b...
February 13, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28257824/27-hydroxycholesterol-induces-invasion-and-migration-of-breast-cancer-cells-by-increasing-mmp9-and-generating-emt-through-activation-of-stat-3
#17
Zhaoxia Shen, Dongmei Zhu, Jiao Liu, Juan Chen, Yun Liu, Chunyan Hu, Zhong Li, Yuan Li
Breast carcinoma plays a vital role in the reasons of global women's death. ER-related invasion and migration play an important part in the development and prognosis of breast cancer. Here, we found that 27-Hydroxycholesterol (27HC) could induce epithelial-mesenchymal transition (EMT) and increase the expression of the matrix metalloproteinase 9 (MMP9) at mRNA level and the active form. Meanwhile, interestingly, we found 27HC activated signal transducer and activator of transcription 3 (STAT-3) in ER positive cells except activation of ER signaling...
February 10, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28215500/environmental-epigenomics-current-approaches-to-assess-epigenetic-effects-of-endocrine-disrupting-compounds-edc-s-on-human-health
#18
REVIEW
Natalia Tapia-Orozco, Gerardo Santiago-Toledo, Valeria Barrón, Ana María Espinosa-García, José Antonio García-García, Roeb García-Arrazola
Environmental Epigenomics is a developing field to study the epigenetic effect on human health from exposure to environmental factors. Endocrine disrupting chemicals have been detected primarily in pharmaceutical drugs, personal care products, food additives, and food containers. Exposure to endocrine-disrupting chemicals (EDCs) has been associated with a high incidence and prevalence of many endocrine-related disorders in humans. Nevertheless, further evidence is needed to establish a correlation between exposure to EDC and human disorders...
February 10, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28233700/ecotoxicity-of-veterinary-enrofloxacin-and-ciprofloxacin-antibiotics-on-anuran-amphibian-larvae
#19
Paola M Peltzer, Rafael C Lajmanovich, Andres M Attademo, Celina M Junges, Carla M Teglia, Candela Martinuzzi, Lucila Curi, María J Culzoni, Hector C Goicoechea
The ecological risks posed by two β-diketone antibiotics (DKAs, enrofloxacin, ENR and ciprofloxacin, CPX), characterized by their long persistence in aqueous environments and known deleterious effect on model organisms such as zebrafish were analysed using Rhinella arenarum larvae. Sublethal tests were conducted using environmentally relevant concentrations of both ENR and CPX (1-1000μgL(-1)) under standard laboratory conditions for 96h. Biological endpoints and biomarkers evaluated were body size, shape, development and growth rates, and antioxidant enzymes (glutathione-S-transferase, GST; Catalase, CAT)...
February 4, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28214749/impairment-in-the-mesohippocampal-dopamine-circuit-following-exposure-to-the-brominated-flame-retardant-hbcdd
#20
Camille Pham-Lake, Elizabeth B Aronoff, Chad R Camp, Aimee Vester, Sam J Peters, W Michael Caudle
Many chemicals have been used to increase the safety of consumer products by reducing their flammability and risk for ignition. Recent focus on brominated flame retardants, such as polybrominated diphenyl ethers (PBDEs) has shown them to contribute to neurobehavioral deficits in children, including learning and memory. As the manufacture and use of PBDEs have been reduced, replacement chemicals, such as hexabromocyclododecane (HBCDD) have been substituted. Our current study evaluated the neurotoxicity of HBCDD, concentrating on dopaminergic innervation to the hippocampus...
March 2017: Environmental Toxicology and Pharmacology
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