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Environmental Toxicology

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https://www.readbyqxmd.com/read/29761655/fennel-induces-cytotoxic-effects-against-testicular-germ-cells-in-mice-evidences-for-suppressed-pre-implantation-embryo-development
#1
Aram Minas, Gholamreza Najafi, Ali Shalizar Jalali, Mazdak Razi
Foeniculum vulgare (FVE; fennel) is an aromatic plant belonging to Umbelliferae family, which is widely used in traditional societies because of its different pharmaceutical properties. To uncover the fennel-derived essential oil (FVEO)-induced effects on male reproductive potential, 24 mature male albino mice were divided into, control, 0.37, 0.75, and 1.5 mg kg-1 FVEO-received groups. Following 35 days, the animals were euthanized and the testicular tissue and sperm samples were collected. The histological alterations, tubular differentiation (TDI), spermiogenesis (SPI) indices, apoptosis ratio, and RNA damage of germinal cells were analyzed...
May 15, 2018: Environmental Toxicology
https://www.readbyqxmd.com/read/29732668/3-4-dihydroxybenzaldehyde-lowers-ros-generation-and-protects-human-red-blood-cells-from-arsenic-iii-induced-oxidative-damage
#2
Nikhil Maheshwari, Fahim Halim Khan, Riaz Mahmood
Arsenic (As) is a potent environmental toxicant and chronic exposure to it results in various malignancies in humans. Oxidative stress has been implicated in the etiopathogenesis of As-induced toxicity. This investigated the protective effect of plant antioxidant 3,4-dihydroxybenzaldehyde (DHB) on sodium meta-arsenite (SA), an As-(III) compound, induced oxidative damage in human red blood cells (RBC). The RBC were first incubated with different concentrations of DHB and then treated with SA at 37°C. Hemolysates were prepared and assayed for various biochemical parameters...
May 6, 2018: Environmental Toxicology
https://www.readbyqxmd.com/read/29726624/regulation-of-eclipta-prostrata-l-components-on-cigarette-smoking-induced-autophagy-of-bronchial-epithelial-cells-via-keap1-nrf2-pathway
#3
Shumin Ding, Xuefeng Hou, Fujing Wang, Gang Wang, Xiaobin Tan, Ying Liu, Yuanli Zhou, Huihui Qiu, E Sun, Nan Jiang, Zihao Li, Jie Song, Liang Feng, Xiaobin Jia
Cigarette smoking extract (CSE)-induced autophagic injury has been regarded as an important contributor to the pathogenesis of lung cancer. We previously found that Eclipta prostrata L. component (CCE) reduced CSE-induced bronchial epithelial cells damage. However, the mechanism remains unknown. Human normal bronchial epithelial cells (NHBE) were exposed to CSE to establish stress model. Nrf2-siRNA and Keap1-siRNA transfection were performed. mRFP-GFP-LC3 dual fluorescence and transmission electron microscopy were used to observe the autophagic characteristics...
May 4, 2018: Environmental Toxicology
https://www.readbyqxmd.com/read/29717538/curcuminoids-combined-with-gefitinib-mediated-apoptosis-and-autophagy-of-human-oral-cancer-sas-cells-in-vitro-and-reduced-tumor-of-sas-cell-xenograft-mice-in-vivo
#4
Yung-Ting Hsiao, Chao-Lin Kuo, Jen-Jyh Lin, Wen-Wen Huang, Shu-Fen Peng, Fu-Shin Chueh, Da-Tian Bau, Jing-Gung Chung
Gefitinib has been used for cancer patients and curcumin (CUR), demethoxycurcumin (DMC), or bisdemethoxycurcumin (BDMC) also shown to induce cancer cell apoptosis. However, no report shows the combination of gefitinib with, CUR, DMC, or BDMC induce cell apoptosis and autophagy in human oral cancer cells. In this study, we investigated the effects of gefitinib with or without CUR, DMC, or BDMC co-treatment on the cell viability, apoptotic cell death, autophagy, mitochondria membrane potential (MMP), and caspase-3 activities by flow cytometry assay and autophagy by acridine orange (AO) staining in human oral cancer SAS cells...
May 2, 2018: Environmental Toxicology
https://www.readbyqxmd.com/read/29708300/gaba-tea-attenuates-cardiac-apoptosis-in-spontaneously-hypertensive-rats-shr-by-enhancing-pi3k-akt-mediated-survival-pathway-and-suppressing-bax-bak-dependent-apoptotic-pathway
#5
Bih-Cheng Chen, Meng-Yu Hung, Hsueh-Fang Wang, Li-Jen Yeh, Sudhir Pandey, Ray-Jade Chen, Ruey-Lin Chang, Vijaya Padma Viswanadha, Kuan-Ho Lin, Chih-Yang Huang
Cardiomyocyte apoptosis is the major risk factor for the development of heart failure (HF). The purpose of this study was to evaluate the effects of Gamma-aminobutyric acid (GABA) tea on hypertension-induced cardiac apoptotic pathways in spontaneously hypertensive rats (SHR). In order to reveal the mechanisms, 36 male SHR at eight weeks of age, 200 g were divided into six groups. One group was fed water as a control group. Other rats were administered one of the following treatments: GABA tea at dose 150 and 300 mg/kg/day as low GABA tea (LGT) and high GABA tea (HGT) groups, respectively, pure GABA at dose 150 and 300 mg/kg/day as LG and HG groups, respectively, green tea (GT) as control of LGT and HGT groups...
April 30, 2018: Environmental Toxicology
https://www.readbyqxmd.com/read/29708299/arsenic-trioxide-induces-growth-inhibition-and-death-in-human-pulmonary-artery-smooth-muscle-cells-accompanied-by-mitochondrial-o2%C3%A2-increase-and-gsh-depletion
#6
Woo Hyun Park, Bo Ran Han, Hyun Kyung Park, Sung Zoo Kim
Arsenic trioxide (ATO; As2 O3 ) induces cell death in various cells via oxidative stress. Expose to chronic arsenic is involved in the development of vascular diseases. However, little is known about the cytotoxic effects of ATO on human normal vascular smooth muscle cells (VSMCs). Thus, in this study, we investigated the effects of ATO on cell growth and death in human pulmonary artery smooth muscle (HPASM) cells in relation to reactive oxygen species (ROS) and glutathione (GSH) levels. ATO treatment decreased the growth of HPASM cells with an IC50 of ∼30-50 μM at 24 h, and ATO induced HPASM cell death via apoptosis or necrosis dependent on the doses of it at this time...
April 30, 2018: Environmental Toxicology
https://www.readbyqxmd.com/read/29683247/synergistic-potential-of-fenvalerate-and-triadimefon-on-endocrine-disruption-and-oxidative-stress-during-rare-minnow-embryo-development
#7
Shenggan Wu, Gaojie Hu, Xueping Zhao, Qiang Wang, Jinhua Jiang
Pyrethroids have been reported to interact synergistically when co-exposed with azoles fungicides in different organisms. In the present study, we investigated the mixture toxicity of fenvalerate (FEN) and triadimefon (TDF) toward embryos of Gobiocypris rarus after 96 h exposure. Results demonstrated that TDF enhanced the acute toxicity of FEN. Exposure to binary mixtures of FEN and TDF resulted in synergistic responses of endocrine disruption by inducing the transcripts of several genes including vtg, erα, erβ1, erβ2, cyp19a, cyp1a, cyp4, cyp11a, gnrh3, gnrhr1a, star, and dmrt1...
April 23, 2018: Environmental Toxicology
https://www.readbyqxmd.com/read/29675927/tributyltin-reduces-the-levels-of-serum-adiponectin-and-activity-of-akt-and-induces-metabolic-syndrome-in-male-mice
#8
Haotian Yan, Hao Guo, Dong Cheng, Ruirui Kou, Cuili Zhang, Jiliang Si
Tributyltin (TBT), a proven environmental obesogen, functions as a nanomolar agonist of the peroxisome proliferator activated receptor-γ (PPARγ). However, the adverse effects of TBT on metabolism are incompletely understood. In this study, male ICR mice were administered TBT (5 and 50 μg·kg- 1 ) by an intraperitoneal injection once every 3 days for 30 days from 28 days of age and bred for another 30 days after the last administration of TBT. We analyzed the effects of these exposures on the fat depot weights, serum lipid profile, serum leptin and adiponectin, hepatic lipid accumulation, and activity of AKT in the liver and skeletal muscle isolated from mice 8 mins after receiving an insulin injection...
April 20, 2018: Environmental Toxicology
https://www.readbyqxmd.com/read/29673083/fine-particle-matter-disrupts-the-blood-testis-barrier-by-activating-tgf-%C3%AE-3-p38-mapk-pathway-and-decreasing-testosterone-secretion-in-rat
#9
Jianhui Liu, Lihua Ren, Jialiu Wei, Jin Zhang, Yupeng Zhu, Xiangyang Li, Li Jing, Junchao Duan, Xianqing Zhou, Zhiwei Sun
Fine particle matter (PM) is correlated with male reproductive dysfunction in animals and humans, but the underlying mechanisms remain unknown. To investigate the toxic mechanism of PM, 32 male Sprague-Dawley (SD) rats were exposed to saline or PM2.5 with the doses of 1.8, 5.4, and 16.2 mg/kg.b.w. via intratracheal instillation, respectively, one time every 3 days, in total times for 30 days. Sperm concentration, hormone level, the expressions of BTB-associated protein and the mitogen-activated protein kinase (MAPK) pathway, tumor necrosis factor α and transforming growth factor β3 levels were detected...
April 19, 2018: Environmental Toxicology
https://www.readbyqxmd.com/read/29673049/impact-of-ozone-on-claudins-and-tight-junctions-in-the-lungs
#10
Byeong-Gon Kim, Pureun-Haneul Lee, Sun-Hye Lee, Choon-Sik Park, An-Soo Jang
Claudins (CLDNs) are a major transmembrane protein component of tight junctions (TJs) in endothelia and epithelia. CLDNs are not only essential for sustaining the role of TJs in cell permeability but are also vital for cell signaling through protein-protein interactions. Ozone induces oxidative stress and lung inflammation in humans and experimental models, but the impact of ozone on claudins remains poorly understood. This study was to determine the expression of TJ proteins, such as claudin 3, 4, 5, and 14 following ozone exposure...
April 19, 2018: Environmental Toxicology
https://www.readbyqxmd.com/read/29667321/the-ethanol-extraction-of-prepared-psoralea-corylifolia-induces-apoptosis-and-autophagy-and-alteres-genes-expression-assayed-by-cdna-microarray-in-human-prostate-cancer-pc-3-cells
#11
Chia-Hsin Lin, Shinji Funayama, Shu-Fen Peng, Chao-Lin Kuo, Jing-Gung Chung
Prostate cancer is the most common male reproductive system cancer. The prevalence of prostate cancer in Europe and the United States is higher than that in the Asian region. However, the treatment of prostate cancer remains unsatisfactory. Psoralea corylifolia has been used to cure this disease as Chinese medicine in the Asian region. In this study, we analyzed the components of ethanol extraction of unprepared and prepared P. corylifolia by HPLC. Psoralen and isopsoralen content from the prepared P. corylifolia is twofold higher than that from unprepared, so we use the prepared extraction in this study...
April 18, 2018: Environmental Toxicology
https://www.readbyqxmd.com/read/29667303/mir-146a-regulates-pm-1-induced-inflammation-via-nf-%C3%AE%C2%BAb-signaling-pathway-in-beas-2b-cells
#12
Limin Liu, Chong Wan, Wei Zhang, Longfei Guan, Guoxiong Tian, Fang Zhang, Wenjun Ding
Exposure to particulate matter (PM) leads to kinds of cardiopulmonary diseases, such as asthma, COPD, arrhythmias, lung cancer, etc., which are related to PM-induced inflammation. We have found that PM2.5 (aerodynamics diameter <2.5 µm) exposure induces inflammatory response both in vivo and in vitro. Since the toxicity of PM is tightly associated with its size and components, PM1 (aerodynamics diameter <1.0 µm) is supposed to be more toxic than PM2.5 . However, the mechanism of PM1 -induced inflammation is not clear...
April 18, 2018: Environmental Toxicology
https://www.readbyqxmd.com/read/29665273/butylidenephthalide-abrogates-the-myofibroblasts-activation-and-mesenchymal-transdifferentiation-in-oral-submucous-fibrosis
#13
Tzu-Rong Su, Yi-Wen Liao, Pei-Ling Hsieh, Lo-Lin Tsai, Chih-Yuan Fang, Taichen Lin, Yu-Hsien Lee, Horng-Jyh Harn, Cheng-Chia Yu
Oral submucous fibrosis (OSF) is a premalignant disorder in the oral cavity, and areca nut chewing habit has been implicated in the persistent activation of myofibroblasts and the subsequent fibrosis. Therefore, it is critical to ameliorate the excessive activities of myofibroblasts prior to the malignant transformation of OSF. In the current study, we evaluated the cytotoxicity of butylidenephthalide (BP), a major phthalide ingredient of Angelica sinensis, in fibrotic buccal mucosal fibroblasts (fBMFs) as well as various myofibroblast hallmarks, including the phenotypical characteristics and fibrosis-related markers...
April 17, 2018: Environmental Toxicology
https://www.readbyqxmd.com/read/29663662/glabridin-induces-apoptosis-and-cell-cycle-arrest-in-oral-cancer-cells-through-the-jnk1-2-signaling-pathway
#14
Chang-Tai Chen, Yi-Tzu Chen, Yi-Hsien Hsieh, Chia-Jui Weng, Jung-Chun Yeh, Shun-Fa Yang, Chiao-Wen Lin, Jia-Sin Yang
Glabridin, a flavonoid extracted from licorice (Glycyrrhiza glabra), possesses various biological properties, including anticancer activities. However, the effect of glabridin on oral cancer cell apoptosis and the underlying molecular mechanisms has not been elucidated. In this study, we demonstrated that glabridin treatment significantly inhibits cell proliferation in human oral cancer SCC-9 and SAS cell lines. Flow cytometric assays demonstrated that glabridin induced several features of apoptosis, such as sub-G1 phase cell increase and phosphatidylserine externalization...
April 16, 2018: Environmental Toxicology
https://www.readbyqxmd.com/read/29663660/7-12-dimethylbenz-%C3%AE-anthracene-increases-cell-proliferation-and-invasion-through-induction-of-wnt-%C3%AE-catenin-signaling-and-emt-process
#15
Yeo-Jung Kwon, Dong-Jin Ye, Hyoung-Seok Baek, Young-Jin Chun
7,12-Dimethylbenz[α]anthracene (DMBA) is a hazardous component present in polluted environments. DMBA has been used as an experimental tool for in vivo tumor formation owing to its carcinogenic effects, but the detailed molecular mechanism of DMBA has not been fully established. To comprehend the carcinogenic mechanism of DMBA, we explored its effects in the breast cancer cell lines, MCF-7 and MDA-MB-231, and the cervical cancer cell line, HeLa. Cell viability assay and measurement of a proliferation marker showed that DMBA markedly increased cancer cell proliferation...
April 16, 2018: Environmental Toxicology
https://www.readbyqxmd.com/read/29663635/di-2-ethylhexyl-phthalate-dehp-induced-testicular-toxicity-through-nrf2-mediated-notch1-signaling-pathway-in-sprague-dawley-rats
#16
Xiangliang Tang, Shengde Wu, Lianju Shen, Yi Wei, Xining Cao, Yangcai Wang, Chunlan Long, Yue Zhou, Dian Li, Fangyuan Huang, Bo Liu, Guanghui Wei
Di-(2-ethylhexyl) phthalate (DEHP) is an environmental endocrine disruptor widely used in China that is harmful to the male reproductive system. Many studies have shown that DEHP causes testicular toxicity through oxidative stress, but the specific mechanism is unknown. Because the Notch pathway is a key mechanism for regulating cell growth and proliferation, we investigated whether Notch is involved in DEHP-induced testicular toxicity and whether vitamins E and C could rescue testicular impairment in Sprague-Dawley (SD) rats...
April 16, 2018: Environmental Toxicology
https://www.readbyqxmd.com/read/29663608/the-effects-of-hexachloronaphthalene-on-selected-parameters-of-heme-biosynthesis-and-systemic-toxicity-in-female-wistar-rats-after-90-day-oral-exposure
#17
Michal Klimczak, Adam Darago, Elzbieta Bruchajzer, Katarzyna Domeradzka-Gajda, Maciej Stepnik, Katarzyna Kuzajska, Anna Kilanowicz
Hexachloronaphthalenes (HxCNs) are the most toxic congeners of polychlorinated naphthalenes, a group of compounds lately included into the list of persistent organic pollutants (POPs). This study presents the effects of 90-day intragastric administration of HxCN to female Wistar rats at doses of 0.03, 0.1, and 0.3 mg/kg body weight. The study examined selected parameters of the heme synthesis pathway, oxidative stress, hepatic cytochromes level, and basic hematology indicators. A micronucleus test was also performed...
April 16, 2018: Environmental Toxicology
https://www.readbyqxmd.com/read/29575470/mechanism-of-bisphenol-af-induced-progesterone-inhibition-in-human-chorionic-gonadotrophin-stimulated-mouse-leydig-tumor-cell-line-mltc-1-cells
#18
Yixing Feng, Jiachen Shi, Zhihao Jiao, Hejun Duan, Bing Shao
Bisphenol AF (BPAF) has been shown to inhibit testicular steroidogenesis in male rats. However, the precise mechanisms related to the toxic effects of BPAF on reproduction remain poorly understood. In the present study, a mouse Leydig tumor cell line (mLTC-1) was used as a model to investigate the mechanism of steroidogenic inhibition and to identify the molecular target of BPAF. Levels of progesterone and the concentration of cyclic adenosine monophosphate (cAMP) in cells exposed to BPAF were detected, and expression of key genes and proteins in steroid biosynthesis was assessed...
March 25, 2018: Environmental Toxicology
https://www.readbyqxmd.com/read/29484840/nf-%C3%AE%C2%BAb-p53-activated-inflammatory-response-involves-in-diquat-induced-mitochondrial-dysfunction-and-apoptosis
#19
Su Eun Choi, Yun Sun Park, Hyun Chul Koh
Inflammation generated by environmental toxicants including pesticides could be one of the factors underlying neuronal cell damage in neurodegenerative diseases. In this study, we investigated the mechanisms by which inflammatory responses contribute to apoptosis in PC12 cells treated with diquat. We found that diquat induced apoptosis, as demonstrated by the activation of caspases and nuclear condensation, inhibition of mitochondrial complex I activity, and decreased ATP level in PC12 cells. Diquat also reduced the dopamine level, indicating that cell death induced by diquat is due to cytotoxicity of dopaminergic neuronal components in these cells...
February 27, 2018: Environmental Toxicology
https://www.readbyqxmd.com/read/29480568/niclosamide-an-oral-antihelmintic-drug-exhibits-antimetastatic-activity-in-hepatocellular-carcinoma-cells-through-downregulating-twist-mediated-cd10-expression
#20
Ming-Hsien Chien, Yung-Chuan Ho, Shun-Fa Yang, Yi-Chieh Yang, Szu-Yu Lai, Wan-Shen Chen, Ming-Jenn Chen, Chao-Bin Yeh
Hepatocellular carcinoma (HCC) is one of the most common malignancies in the world, especially, in eastern Asia, and its prognosis is poor once metastasis occurs. Niclosamide, a US Food and Drug Administration-approved antihelmintic drug, was shown to inhibit the growth of various cancers including HCC, but the effect of niclosamide on cell motility and the underlying mechanism have not yet been completely defined. The present study demonstrated that niclosamide, at 0-40 nM, concentration-dependently inhibited wound closure and the migratory/invasive capacities of human Huh7 and SK-Hep-1 HCC cells without exhibiting cytotoxicity...
June 2018: Environmental Toxicology
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