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Environmental Toxicology

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https://www.readbyqxmd.com/read/28856835/the-role-s-nitrosylation-in-manganese-induced-autophagy-dysregulation-in-sh-sy5y-cells
#1
Zhuo Ma, Can Wang, Chang Liu, Dong-Ying Yan, Yu Deng, Wei Liu, Tian-Yao Yang, Zhao-Fa Xu, Bin Xu
Overexposure to manganese (Mn) has been known to induce nitrosative stress. The dysregulation of autophagy has implicated in nitric oxide (NO) bioactivity alterations. However, the mechanism of Mn-induced autophagic dysregulation is unclear. The protein of Bcl-2 was considered as a key role that could participate to the autophagy signaling regulation. To further explore whether S-nitrosylation of Bcl-2 involved in Mn-induced autophagy dysregulation, we treated human neuroblastoma (SH-SY5Y) cells with Mn and pretreated cells with 1400 W, a selective iNOS inhibitor...
August 30, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/28856781/cellular-apoptosis-and-cardiac-dysfunction-in-stz-induced-diabetic-rats-attenuated-by-anthocyanins-via-activation-of-igfi-r-pi3k-akt-survival-signaling
#2
Yin-Tso Liu, Pei-Chen Huang, Guei-Jane Wang, Ming-Jen Fan, Marthandam Asokan Shibu, Vijaya Padma Viswanadha, Yi-Lin Lin, Chao-Hung Lai, Yu-Feng Chen, Hung-En Liao, Chih-Yang Huang
Anthocyanins are known cyto-protective agents against various stress conditions. In this study cardio-protective effect of anthocyanins from black rice against diabetic mellitus (DM) was evaluated using a streptozotocin (STZ)-induced DM rat model. Five-week-old male Wistar rats were administered with STZ (55 mg kg(-1) , IP) to induce DM; rats in the treatment group received 250 mg oral anthocyanin/kg/day during the 4-week treatment period. DM and the control rats received normal saline through oral gavage...
August 30, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/28846189/the-mechanisms-for-lung-cancer-risk-of-pm2-5-induction-of-epithelial-mesenchymal-transition-and-cancer-stem-cell-properties-in-human-non-small-cell-lung-cancer-cells
#3
Hongying Wei, Fan Liang, Wei Cheng, Ren Zhou, Xiaomeng Wu, Yan Feng, Yan Wang
Fine particulate matter (PM2.5 ) is a major component of air pollutions that are closely associated with increased risk of lung cancer. However, the role of PM2.5 in the etiology of lung cancer is largely unknown. In this study, we performed acute (24 hours) and chronic (five passages) exposure models to investigate the carcinogenetic mechanisms of PM2.5 by targeting the induction of epithelial-mesenchymal transition (EMT) and cancer stem cells (CSC) properties in human non-small cell lung cancer cell line A549...
August 28, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/28836394/reduced-nrf2-activation-in-pi3k-phosphorylation-impaired-vitiliginous-keratinocytes-increases-susceptibility-to-ros-generating-chemical-induced-apoptosis
#4
Hyangmi Kim, Chang Seo Park, Ai-Young Lee
Keratinocytes in affected epidermis of vitiligo patients are known to have impaired activation of the PI3K/AKT pathway. Based on critical roles of keratinocytes and oxidative stress in vitiligo development, this study examined whether keratinocytes with impaired PI3K activation were more vulnerable to apoptosis caused by oxidative stress from phenolic compounds, p-tert-butylphenol (4-TBP) and hydroquinone (HQ). Cell viability assay, FACS analysis, ELISA for TNF-α or IL-1a, ROS assay, Western blot analysis for Nrf2 expression, and confocal microscopy with anti-Nrf2 and phospho-PI3K antibodies were done on primary cultured normal human keratinocytes with or without PI3K knockdown in the presence or absence of chemical treatment or antioxidant...
August 24, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/28836330/actein-alleviates-2-3-7-8-tetrachlorodibenzo-p-dioxin-mediated-cellular-dysfunction-in-osteoblastic-mc3t3-e1-cells
#5
Eun Mi Choi, Kwang Sik Suh, Woon-Won Jung, So Young Park, Sang Ouk Chin, Sang Youl Rhee, Youngmi Kim Pak, Suk Chon
The environmental pollutant 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) is known to affect bone metabolism. We evaluated the protective effects of the triterpene glycoside actein from the herb black cohosh against TCDD-induced toxicity in MC3T3-E1 osteoblastic cells. We found that TCDD significantly reduced cell viability and increased apoptosis and autophagy in MC3T3-E1 osteoblastic cells (P < .05). In addition, TCDD treatment resulted in a significant increase in intracellular calcium concentration, mitochondrial membrane potential collapse, reactive oxygen species (ROS) production, and cardiolipin peroxidation, whereas pretreatment with actein significantly mitigated these effects (P < ...
August 24, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/28834114/galangin-suppresses-h2-o2-induced-aging-in-human-dermal-fibroblasts
#6
Su-Ying Wen, Jia-Yi Chen, Yueh-Shan Weng, Ritu Aneja, Chih-Jung Chen, Chih-Yang Huang, Wei-Wen Kuo
Human skin aging is a progressive process that includes intrinsic aging and extrinsic photodamage, both of which can cause an accumulation of reactive oxygen species (ROS), resulting in dermal fibrosis dysfunction and wrinkle formation. Galangin is a flavonoid that exhibits anti-inflammatory and antioxidative potential. Previous studies have reported that galangin has antioxidative activity against ROS-mediated stress. The aim of the present study is to determine the antiaging effects of galangin on dermal fibroblasts exposed to H2 O2 ...
August 18, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/28804952/evaluation-of-cytotoxicity-of-propofol-and-its-related-mechanism-in-glioblastoma-cells-and-astrocytes
#7
Shu-Shong Hsu, Chung-Ren Jan, Wei-Zhe Liang
Propofol (2,6-diisopropylphenol), one of the extensively and commonly used anesthetic agents, has been shown to affect the biological behavior of various models. Previous researches have shown that propofol-induced cytotoxicity might cause anticancer effect in different cells. However, the mechanisms underlying the effect of propofol on cytotoxicity is still elusive in human glioblastoma cells. The aims of this study were to evaluate effects of propofol on cytotoxicity, cell cycle distribution and ROS production, and establish the relationship between oxidative stress and cytotoxicity in GBM 8401 human glioblastoma cells and DI TNC1 rat astrocytes...
August 14, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/28804948/nelumbo-nucifera-leaf-extract-treatment-attenuated-preneoplastic-lesions-and-oxidative-stress-in-the-livers-of-diethylnitrosamine-treated-rats
#8
Chi-Ting Horng, Chien-Wei Huang, Mon-Yuan Yang, Tzu-Hsin Chen, Yun-Ching Chang, Chau-Jong Wang
Lotus (Nelumbo nucifera Gaertn) possesses antioxidant, hepatoprotective, and anticancer potential. This study determined the protective role of aqueous extract from Nelumbo nucifera leaves (NLE) against N-diethylnitrosamine (DEN)-induced oxidative stress and hepatocellular carcinogenesis in a sample of Sprague-Dawley rats. NLE was fed orally to rats in which hepatic carcinoma was induced with DEN for 12 weeks. Five groups of 12 rats each were used for the study: Group I (control group) rats received distilled water; Group II rats were induced with DEN; Group III rats were induced with DEN and cotreated with 0...
August 14, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/28795476/ouabain-impairs-cell-migration-and-invasion-and-alters-gene-expression-of-human-osteosarcoma-u-2-os-cells
#9
Yung-Luen Shih, Man-Kuan Au, Ko-Lin Liu, Ming- Yang Yeh, Ching-Hsiao Lee, Mei-Hui Lee, Hsu-Feng Lu, Jiun-Long Yang, Rick Sai-Chuen Wu, Jing-Gung Chung
Ouabain, the specific Na(+) /K(+) -ATPase blocker, has biological activity including anti-proliferative and anti-metastasis effects in cancer cell. There is no study to show ouabain inhibiting cell migration and invasion in human osteosarcoma U-2 OS cells. Thus, we investigated the effect of ouabain on the cell migration and invasion of human osteosarcoma U-2 OS cells. Results indicated that ouabain significantly decreased the percentage of viable cells at 2.5-5.0 μM, thus, we selected 0.25-1.0 μM for inhibiting studies...
August 10, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/28741790/diallyl-trisulfide-inhibits-cell-migration-and-invasion-of-human-melanoma-a375-cells-via-inhibiting-integrin-facal-adhesion-kinase-pathway
#10
Hsiao-Chi Wang, Yung-Lin Chu, Shu-Chen Hsieh, Lee-Yan Sheen
Melanoma is the leading cause of death from skin disease due to its propensity for metastasis. Studies have shown that integrin-mediated focal adhesion kinase (FAK) signal pathway is implicated in cell proliferation, survival and metastasis of tumor cells. Our previous results indicated that diallyl trisulfide (DATS) provided its antimelanoma activity via inducing cell cycle arrest and apoptosis. The aim of this study was to explore DATS mediated antimetastatic effect and the corresponding mechanism in human melanoma A375 cells...
July 25, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/28731287/tricetin-suppresses-human-oral-cancer-cell-migration-by-reducing-matrix-metalloproteinase-9-expression-through-the-mitogen-activated-protein-kinase-signaling-pathway
#11
Tsung-Te Chung, Chun-Yi Chuang, Ying-Hock Teng, Ming-Ju Hsieh, Ji-Ching Lai, Yi-Ting Chuang, Mu-Kuan Chen, Shun-Fa Yang
Tricetin is a flavonoid derivative and a potent anti-inflammatory and anticancer agent. However, the molecular mechanism underlying the effects of tricetin on human oral cancer cell migration remains unclear. The cell migration and invasion abilities of three oral cancer cell lines (SCC-9, HSC-3, and OECM-1) were analyzed using Boyden chamber migration assays. Our results demonstrated that tricetin attenuates 12-O-tetradecanoylphorbol-13-acetate-induced SCC-9, HSC-3, and OECM-1 cell invasiveness and migration by reducing matrix metalloproteinase (MMP)-9 enzyme activity...
July 21, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/28722353/auramine-o-an-incense-smoke-ingredient-promotes-lung-cancer-malignancy
#12
Jia-Chen Tung, Wei-Chien Huang, Juan-Cheng Yang, Guan-Yu Chen, Chi-Chen Fan, Yu-Chuan Chien, Pei-Shan Lin, Shih-Chun Candice Lung, Wei-Chao Chang
Burning incense to worship deities is a popular religious ritual in large parts of Asia, and is a popular custom affecting more than 1.5 billion adherents. Due to incomplete combustion, burning incense has been well recognized to generate airborne hazards to human health. However, the correlation between burning incense and lung cancer in epidemiological studies remains controversy. Therefore, we speculated that some unknown materials in incense smoke are involved in the initiation or progression of lung cancer...
July 19, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/28722351/%C3%AE-mangostin-suppresses-human-hepatocellular-carcinoma-cell-invasion-through-inhibition-of-mmp-2-and-mmp-9-expression-and-activating-the-erk-and-jnk-pathways
#13
Chien-Feng Huang, Ying-Hock Teng, Fung-Jou Lu, Wen-Hung Hsu, Chia-Liang Lin, Chia-Chen Hung, Jai-Nien Tung, Yi-Hsien Hsieh, Chung-Jung Liu
β-mangostin is a dietary xanthone that has been reported to have the anticancer properties in some human cancer cell types. However, the antimetastatic effect and molecular mechanism of β-mangostin action in human hepatocellular carcinoma (HCC) cells remain unknown. In this study, we found that β-mangostin did not induce cytotoxicity in human HCC cells (SK-Hep-1, Huh-7 and HA22T/VGH cells). β-mangostin could inhibit migration and invasion of human HCC cells. Meanwhile, β-mangostin significantly decreased the protein activities and expression of matrix metalloproteinase (MMP)-2 and MMP-9 via increasing the activation of MEK1/2, ERK1/2, MEK4 and JNK1/2 signaling pathways...
July 19, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/28722335/protective-effects-of-folic-acid-on-pm2-5-induced-cardiac-developmental-toxicity-in-zebrafish-embryos-by-targeting-ahr-and-wnt-%C3%AE-catenin-signal-pathways
#14
Cong Yue, Cheng Ji, Hang Zhang, Leshuai W Zhang, Jian Tong, Yan Jiang, Tao Chen
Our previous observations indicated that extractable organic matter (EOM) from PM2.5 induced malformations in the heart of zebrafish embryos by activating AhR and inhibiting canonical Wnt/β-catenin signal pathway. As a nutritional factor, folic acid (FA) is reported to prevent cardiac defects during embryo development. Hence, we hypothesize that FA may prevent PM2.5-induced heart defects by interfering with AhR and Wnt/β-catenin signaling pathways. Our results showed that FA supplementation alleviated the EOM-induced heart defects in zebrafish embryos, and both AhR inhibitor CH223191 and Wnt activator CHIR99021 enhanced the protective efficiency of FA...
July 19, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/28722333/xiap-inhibitor-embelin-induces-autophagic-and-apoptotic-cell-death-in-human-oral-squamous-cell-carcinoma-cells
#15
You-Jin Lee, Bong-Soo Park, Hae-Ryoun Park, Su-Bin Yu, Hae-Mi Kang, In-Ryoung Kim
Embelin is an active ingredient of traditional herbal remedies for cancer and other diseases. Recently, it has been suggested that autophagy may play an important role in cancer therapy. However, little data are available regarding the role of autophagy in oral cancers. Therefore, we conducted this study to examine whether Embelin modulates autophagy in Ca9-22. Our results showed that Embelin had anticancer activity against the Ca9-22 human tongue squamous cell, and we observed that autophagic vacuoles were formed by MDC and AO...
July 19, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/28707438/long-term-impact-of-the-endocrine-disruptor-tributyltin-on-male-fertility-following-a-single-acute-exposure
#16
Sumonto Mitra, Ankit Srivastava, Shashi Khandelwal
Declining rate of human fertility is a growing concern, where lifestyle and environmental factors play an important role. We recently demonstrated that tributyltin (TBT), an omnipresent endocrine disruptor, affects testicular cells in vitro. In this study, male Wistar rats were gavaged a single dose of 10, 20, and 30 mg/kg TBT-chloride (TBTC) (to mimic accidental exposure in vivo) and sacrificed on day 3 and day 7, respectively. TBT bioavailability was evaluated by estimating total tin content, and essential metal levels were analyzed along with redox molecules (ROS and GSH/GSSG) to understand the effect on physiological conditions...
July 14, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/28707373/biomarker-responses-and-pah-ratios-in-fish-inhabiting-an-estuarine-urban-waterway
#17
Rafael Mendonça Duarte, Helen Sadauskas-Henrique, Vera Maria Fonseca de Almeida-Val, Adalberto Luis Val, Helen Elizabeth Nice, Marthe Monique Gagnon
Many cities worldwide are established adjacent to estuaries and their catchments resulting in estuarine contamination due to intense anthropogenic activities. The aim of this study was to evaluate if fish living in an estuarine urban waterway were affected by contamination, via the measurement of a suite of biomarkers of fish health. Black bream (Acanthopagrus butcheri) were sampled in a small urban embayment and a suite of biomarkers of fish health measured. These were condition factor (CF), liver somatic index (LSI), gonadosomatic index (GSI), hepatic EROD activity, polycyclic aromatic hydrocarbon (PAH) biliary metabolites, serum sorbitol dehydrogenase (s-SDH) and branchial enzymes cytochrome C oxidase (CCO), and lactate dehydrogenase (LDH) activities...
July 14, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/28699257/effects-of-ochratoxin-a-on-er-stress-mapk-signaling-pathway-and-autophagy-of-kidney-and-spleen-in-pigs
#18
Fang Gan, Lili Hou, Yajiao Zhou, Yunhuan Liu, Da Huang, Xingxiang Chen, Kehe Huang
Ochratoxin A (OTA), a worldwide mycotoxin found in food and feeds, is a potent nephrotoxin and immunotoxin in animals and humans. This research was conducted to evaluate whether endoplasmic reticulum (ER) stress, MAPK signaling pathway and autophagy were induced by OTA in kidney and spleen of pigs. Twenty-seven crossbred pigs randomly allocated to 3 groups were fed for 42 days ad libitum a basal diet without (Con group, 0.00 μg OTA/kg) and with supplementation of OTA at 400 (OTA-L group) and 800 μg/kg (OTA-H group)...
July 12, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/28678435/molecular-mechanisms-of-action-of-styrene-toxicity-in-blood-plasma-and-liver
#19
Kamal Niaz, Faheem Mabqool, Fazlullah Khan, Fatima Ismail Hassan, Maryam Baeeri, Mona Navaei-Nigjeh, Shokoufeh Hassani, Mahdi Gholami, Mohammad Abdollahi
Styrene is an aromatic colorless hydrocarbon available in liquid form and highly volatile. In its pure form, it gives a sweet smell. The primary source of exposure in the environment is from plastic materials, rubber industries, packaging materials, insulations, and fiber glass and carpet industry. Natural sources of styrene include: few metabolites in plants which are transferred through food chain. The current study was designed to evaluate styrene toxicity, including: superoxide dismutase (SOD) and protein carbonyl, oxidative stress, glucose-6-phosphatase (G6Pase), glycogen phosphorylase (GP), and phosphoenolpyruvate carboxykinase (PEPCK) activities, adenosine triphosphate (ATP) to adenosine diphosphate (ADP) ratio, and changes in gene expressions such as glutamate dehydrogenase 1 (GLUD1), glucose transporter 2 (GLUT2), and glucokinase (GCK) in the rat liver tissue...
July 5, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/28678414/freshwater-toxicity-testing-using-rehydrated-philodina-sp-rotifera-as-test-animals
#20
Terry W Snell, Rachel K Johnston, Amelia B Matthews
Rotifers have become widely used in aquatic toxicology as a rapid screening test for toxicity. The commercial availability of diapausing embryos (cysts) have facilitated their popularity because test animals can be obtained without having to master the details of culturing. Other rotifer species have life stages capable of surviving desiccation and also could be used in non-culture systems for toxicity assessment. In this article, we describe a system for toxicity testing in freshwater based on rehydrating desiccated bdelloid rotifers in the genus Philodina...
July 5, 2017: Environmental Toxicology
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