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Toxic stress

Karla A Mark, Kathleen J Dumas, Dipa Bhaumik, Birgit Schilling, Sonnet Davis, Tal Ronnen Oron, Dylan J Sorensen, Mark Lucanic, Rachel B Brem, Simon Melov, Arvind Ramanathan, Bradford W Gibson, Gordon J Lithgow
Vitamin D has multiple roles, including the regulation of bone and calcium homeostasis. Deficiency of 25-hydroxyvitamin D, the major circulating form of vitamin D, is associated with an increased risk of age-related chronic diseases, including Alzheimer's disease, Parkinson's disease, cognitive impairment, and cancer. In this study, we utilized Caenorhabditis elegans to examine the mechanism by which vitamin D influences aging. We found that vitamin-D3-induced lifespan extension requires the stress response pathway genes skn-1, ire-1, and xbp-1...
October 25, 2016: Cell Reports
Zeineb Kamoun, Alya Sellami Kamoun, Ali Bougatef, Rim Marrakchi Kharrat, Houssem Youssfi, Tahia Boudawara, Mouna Chakroun, Moncef Nasri, Najiba Zeghal
Ethanol consumption-induced oxidative stress that is a major etiological factor has been proven to play important roles in organs' injury. In the present study, we investigated the protective effect of fish protein hydrolysate prepared from the heads and viscera of sardinelle (Sardinella aurita) (SPH) against the toxicity of ethanol on the liver and kidney of adult male rats. Animals were divided into four groups of six animals each: group C served as control, group Eth received 30 % ethanol solution at the dose of 3 g/kg body weight, group SPH received only 7...
October 25, 2016: Environmental Science and Pollution Research International
Ya Li, Hui Han, Lin Yan He, Qi Wang, Xia Fang Sheng
A hydroponic culture experiment was performed to investigate the effects of endophytic Bacillus megaterium H3 on the plant biomass, Cd accumulation and tolerance of hybrid pennisetum, and the mechanisms involved in the different levels of Cd-contaminated aquatic environments. Strain H3 significantly increased the plant growth (ranging from 13 to 71 %) and total Cd uptake (ranging from 41 to 160 %) but decreased Cd translocation factors of hybrid pennisetum treated with 0-20 μM Cd compared with the controls...
October 25, 2016: Environmental Science and Pollution Research International
Milena Masullo, Cosimo Pizza, Sonia Piacente
Oleanolic acid has been considered a good start molecule for synthetic exploitation. Thus hundreds of oleanane triterpenoids have been synthesized and patented. Also many oleanane saponins have been patented for their biological activities and possible pharmaceutical use. Areas covered: Patents reporting the biological activities of oleanane derivatives and saponins with oleanane-type aglycones were examined. Among the synthesized oleanane derivatives, the most promising seem to be 2-cyano-3,12-dioxoolean-1,9(11)-dien-28-oic acid derivatives which interfere with many pathways involved in inflammation, oxidative stress and cell proliferation...
October 26, 2016: Expert Opinion on Therapeutic Patents
M Chevallet, B Gallet, A Fuchs, P H Jouneau, K Um, E Mintz, I Michaud-Soret
Increased production and use of zinc oxide nanoparticles (ZnO-NPs) in consumer products has prompted the scientific community to investigate their potential toxicity, and understand their impact on the environment and organisms. Molecular mechanisms involved in ZnO-NP toxicity are still under debate and focus essentially on high dose expositions. In our study, we chose to evaluate the effect of sub-toxic doses of ZnO-NPs on human hepatocytes (HepG2) with a focus on metal homeostasis and redox balance disruptions...
October 26, 2016: Nanoscale
Masayuki Takamatsu, Koichi Fukase, Ritsuko Oka, Shinobu Kitazume, Naoyuki Taniguchi, Katsunori Tanaka
Acrolein, a highly toxic α, β-unsaturated aldehyde, has been a longstanding key biomarker associated with a range of disorders related to oxidative stresses. One of the most promising methods for detecting acrolein involves the use of antibodies that can recognize the acrolein-lysine conjugate, 3-formyl-3, 4-dehydropiperidines (FDP), within oxidatively stressed cells and tissues from various disease states. We have uncovered here that FDP could reduce nitroarenes in high yields at 100 °C in the presence of excess CaCl2 as a Lewis acid promoter...
October 26, 2016: Scientific Reports
Anouar Ben Saad, Ilhem Rjeibi, Dalel Brahmi, Amani Smida, Sana Ncib, Nacim Zouari, Lazher Zourgui
Malva sylvestris has recently attracted special attention due to its potential activities in many chronic disorders. We aimed to assess the beneficial effects of Malva sylvestris extract against lithium carbonate induced renal damage in male Wistar rats. For this purpose, Malva sylvestris extract at a dose of 0.2g/kg was orally administrated, followed by 25mg/kg of lithium carbonate (intraperitoneal injection) for 30 days. Malva sylvestris extract was proved to contain large amounts of K(+), Na(+), Ca(++) and the existence of phenolic acids and flavonoids shown by the obtained HPLC-based analysis...
October 22, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
Ahmad Salimi, Mehryar Habibi Roudkenar, Leila Sadeghi, Alireza Mohseni, Enayatollah Seydi, Nahal Pirahmadi, Jalal Pourahmad
The present study investigates the in vitro and in vivo effect of acacetin (4'-methoxy-5,7-dihydroxyflavone) on chronic lymphocytic leukemia (CLL) B-lymphocytes and mitochondria. CLL B-lymphocytes and healthy B-lymphocytes were obtained from CLL patients and healthy donors, respectively. Mitochondria were isolated from B-lymphocytes of both groups. Xenografts in severe combined immune deficient mice were used to examine the toxicity and anti CLL activity of acacetin. We evaluated and compared the mechanism of action of acacetin on CLL and healthy B-lymphocytes and their mitochondria...
October 25, 2016: Nutrition and Cancer
Yun Wu, Zhiqiang Guo, Wei Zhang, Qiaoguo Tan, Li Zhang, Xinlei Ge, Mindong Chen
Heavy metals activate the synthesis of phytochelatins (PCs), while the induced PCs might affect metal uptake via chelating intracellular free metals. However, the relationship of PCs to metal uptake is poorly understood. In this study, we examined the kinetics of cadmium (Cd) accumulation and the synthesis of PCs in a marine diatom, Thalassiosira weissflogii, under different irradiance levels. Irradiance alone could not change the concentrations of PCs in the Cd-free treatments, while higher irradiance accelerated the induction of intracellular PCs at the same [Cd(2+)] level...
October 25, 2016: Scientific Reports
Doc Mariano, D de Souza, D F Meinerz, J Allebrandt, A F de Bem, W Hassan, Oed Rodrigues, Jbt da Rocha
Acquired immunodeficiency syndrome (AIDS) is a worldwide disease characterized by impairments of immune function. AIDS can be associated with oxidative stress (OS) that can be linked to selenium (Se) deficiency. Se is fundamental for the synthesis of selenoproteins, such as glutathione peroxidase and thioredoxin reductase. These enzymes catalyze the decomposition of reactive oxygen species and contribute to maintain equilibrium in cell redox status. Literature data indicate that organoselenium compounds, such as ebselen and diphenyl diselenide, have antioxidant properties in vitro and in vivo models associated with OS...
October 24, 2016: Human & Experimental Toxicology
Dana S Poole, Nathalie Doorenweerd, Jaap J Plomp, Ahmed Mahfouz, Marcel J T Reinders, Louise van der Weerd
The ability to administer systemically high doses of manganese as contrast agent while circumventing its toxicity is of particular interest for exploratory MRI studies of the brain. Administering low doses either repeatedly or continuously over time has been shown to enable the acquisition of satisfactory MRI images of the mouse brain without apparent side effects. Here we have systematically compared the obtained MRI contrast and recorded potential systemic side effects such as stress response and muscle strength impairment in relation to the achieved contrast...
October 21, 2016: NeuroImage
Hanen Ferjani, Hossam Draz, Salwa Abid, Abedellatif Achour, Hassen Bacha, Imen Boussema-Ayed
Tacrolimus (TAC) and mycophenolate mofetil (MMF) are common immunosuppressive drugs used to avoid immunological rejection of transplanted organs. The risk of developing cancer is the most critical complication in organ transplant recipients undergoing immunosuppressive therapy. This study aims to explore the cytotoxic and genotoxic effects of TAC and MMF alone or combined orally administrated on spleen and bone marrow of Wistar rats. Our results showed that TAC (2.4; 24 and 60mg/kg) and MMF (5; 50 and 125mg/kg) induced a genotoxic effect on rat bone marrow...
November 1, 2016: Mutation Research
Eugene Peter Magennis, Andrew L Hook, Paul Williams, Morgan Russell Alexander
Biomedical devices are indispensable in modern medicine yet offer surfaces that promote bacterial attachment and biofilm formation resulting in chronic healthcare-associated infections. We have developed a simple method to graft acrylates to silicone rubber, polydimethylsiloxane (PDMS), a commonly used device material that is often colonized by bacteria. We demonstrate a novel method whereby non-toxic bacteria attachment resistant polymers can be readily grafted-from and grafted-to the surface using thiol-ene chemistry, substantially reducing bacterial colonization...
October 24, 2016: ACS Applied Materials & Interfaces
C Ambrogio, M Barbacid, D Santamaría
Activating mutations in KRAS and EGFR, the two most frequent oncogenes in human lung adenocarcinoma, are mutually exclusive, a phenotype attributed to functional redundancy implying lack of positive selection. Employing a mouse model expressing EGFR(L858R) in advanced Kras(G12V)-driven tumors we show that their mutual exclusivity can be explained by detrimental effects of their co-expression in lung adenocarcinoma. In vivo, expression of EGFR(L858R) in Kras(G12V)-driven tumors triggers replicative stress and apoptosis, while the surviving cells enter a transient cytostatic state incompatible with tumor development that is fully reversible upon discontinued EGFR(L858R) expression...
October 24, 2016: Oncogene
Gavino Faa, Mirko Manchia, Roberta Pintus, Clara Gerosa, Maria Antonietta Marcialis, Vassilios Fanos
Starting from the Developmental Origins of Health and Disease (DOHaD) hypotheses proposed by David Barker, namely fetal programming, in the past years, there is a growing evidence of the major role played by epigenetic factors during the intrauterine life and the perinatal period. Furthermore, it has been assessed that these factors can affect the health status in infancy and even in adulthood. In this review, we focus our attention on the fetal programming of the brain, analyzing the most recent literature concerning the epigenetic factors that can influence the development of neuropsychiatric disorders such as bipolar disorders, major depressive disorders, and schizophrenia...
October 24, 2016: Birth Defects Research. Part C, Embryo Today: Reviews
Harun-Or Rashid, Hyun-Kyoung Kim, Raghupatil Junjappa, Hyung-Ryong Kim, Han-Jung Chae
Compromised protein folding capacity in the endoplasmic reticulum (ER) leads to a protein traffic jam that produces a toxic environment called ER stress. However, the ER smartly handles such a critical situation by activating a cascade of proteins responsible for sensing and responding to the noxious stimuli of accumulated proteins. The ER protein load is higher in secretory cells, such as liver hepatocytes, which are thus prone to stress-mediated toxicity and various diseases, including alcohol-induced liver injury, fatty liver disease, and viral hepatitis...
October 23, 2016: Journal of Gastroenterology and Hepatology
Keren Bachi, Salvador Sierra, Nora D Volkow, Rita Z Goldstein, Nelly Alia-Klein
Drug-addiction may trigger early onset of age-related disease, due to drug-induced multi-system toxicity and perilous lifestyle, which remains mostly undetected and untreated. We present the literature on pathophysiological processes that may hasten aging and its relevance to addiction, including: oxidative stress and cellular aging, inflammation in periphery and brain, decline in brain volume and function, and early onset of cardiac, cerebrovascular, kidney, and liver disease. Timely detection of accelerated aging in addiction is crucial for the prevention of premature morbidity and mortality...
February 2017: Current Opinion in Behavioral Sciences
Benxu Cheng, Pinki Anand, Anxiu Kuang, Feroz Akhtar, Virginia L Scofield
Ubiquitin proteasome system (UPS) dysfunction has been implicated in the development of many neuronal disorders, including Parkinson's disease (PD). Previous studies focused on individual neuroprotective agents and their respective abilities to prevent neurotoxicity following a variety of toxic insults. However, the effects of the antioxidant N-acetylcysteine (NAC) on proteasome impairment-induced apoptosis have not been well characterized in human neuronal cells. The aim of this study was to determine whether cotreatment of NAC and insulin-like growth factor-1 (IGF-1) efficiently protected against proteasome inhibitor-induced cytotoxicity in SH-SY5Y cells...
2016: Parkinson's Disease
Shreesh Ojha, Balaji Venkataraman, Amani Kurdi, Eglal Mahgoub, Bassem Sadek, Mohanraj Rajesh
Cisplatin (CSP) is a chemotherapeutic agent commonly used to treat a variety of malignancies. The major setback with CSP treatment is that its clinical efficacy is compromised by its induction of organ toxicity, particular to the kidneys and ears. Despite the significant strides that have been made in understanding the mechanisms underlying CSP-induced renal toxicity, advances in developing renoprotective strategies are still lacking. In addition, the renoprotective approaches described in the literature reveal partial amelioration of CSP-induced renal toxicity, stressing the need to develop potent combinatorial/synergistic agents for the mitigation of renal toxicity...
2016: Oxidative Medicine and Cellular Longevity
Sricharani Rao Balmuri, Uthra Selvaraj, Vadivel Vinod Kumar, Savarimuthu Philip Anthony, Aristides Michael Tsatsakis, Kirill Sergeevich Golokhvast, Thiagarajan Raman
Cadmium (Cd), classified as human carcinogen, is an extremely toxic heavy metal pollutant, and there is an increasing environmental concern for cadmium exposure through anthropogenic sources including cigarette smoke. Though Cd based nanoparticles such as cadmium oxide (CdO) are being widely used in a variety of clinical and industrial applications, the toxicity of CdO nanoparticles has not been well characterized. Herein we report the toxicity of CdO nanoparticles employing zebrafish as a model. Two different CdO nanoparticles were prepared, calcination of Cd(OH)2 without any organic molecule (CdO-1) and calcination of Cd-citrate coordination polymer (CdO-2), to evaluate and compare the toxicity of these two different CdO nanoparticles...
October 20, 2016: Environmental Research
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