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https://www.readbyqxmd.com/read/28944924/cyclic-helix-b-peptide-protects-hk%C3%A2-2-cells-from-oxidative-stress-by-inhibiting-er-stress-and-activating-nrf2-signalling-and-autophagy
#1
Long Li, Miao Lin, Lexi Zhang, Shang Huang, Chao Hu, Long Zheng, Liping Li, Chao Zhang, Cheng Yang, Yaqiu Long, Ruiming Rong, Tongyu Zhu
Renal ischemia‑reperfusion injury (IRI) is present in numerous diseases and is observed following certain treatments, including renal transplantation. Preventing tubular epithelial cells (TECs) from undergoing apoptosis is vital for treatment of renal IRI. Cyclic helix B peptide (CHBP) is a novel agent that has a protective effect on renal IRI in vivo. In the present study, the effect and underlying mechanism of CHBP on TECs was investigated. The HK‑2 human renal proximal tubular epithelial cell line was treated with 500 µmol/l H2O2 for 4 h prior to determining the effect of CHBP pretreatment for 1 h on cell viability, caspase 3 activity and expression levels, expression levels of oxidative stress markers, endoplasmic reticulum (ER) stress markers, NF‑E2‑related factor 2 (Nrf2), heme oxygenase‑1 (HO‑1) and autophagy markers...
September 22, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28942440/epigallocatechin-3-gallate-ameliorates-angiotensin-ii-induced-oxidative-stress-and-apoptosis-in-human-umbilical-vein-endothelial-cells-through-the-activation-of-nrf2-caspase-3-signaling
#2
Xiuli Zhou, Liwen Liang, Yan Zhao, Hong Zhang
INTRODUCTION: This study aimed to investigate whether epigallocatechin-3-gallate (EGCG) shows antioxidant activity against angiotensin II (Ang II)-induced human umbilical vein endothelial cell (HUVEC) apoptosis. MATERIALS AND METHODS: The viability of HUVECs was revealed by MTT and LDH assay. The cell apoptosis was detected by FITC-PI assay. A fluorescent probe assay was used to measure the reactive oxygen species (ROS) generation in HUVECs. Mitochondrial permeability transition pore (MPTP) opening, mitochondrial membrane potential, and caspase-3, -4, -8, -9 activities were also measured...
September 23, 2017: Journal of Vascular Research
https://www.readbyqxmd.com/read/28942193/identification-of-novel-nrf2-activators-from-cinnamomum-chartophyllum-h-w-li-and-their-potential-application-of-preventing-oxidative-insults-in-human-lung-epithelial-cells
#3
Ming-Xing Zhou, Guo-Hui Li, Bin Sun, You-Wei Xu, Ai-Ling Li, Yan-Ru Li, Dong-Mei Ren, Xiao-Ning Wang, Xue-Sen Wen, Hong-Xiang Lou, Tao Shen
Human lung tissue, directly exposed to the environmental oxidants and toxicants, is apt to be harmed to bring about acute or chronic oxidative insults. The nuclear factor erythroid 2-related factor 2 (Nrf2) represents a central cellular defense mechanism, and is a target for developing agents against oxidative insult-induced human lung diseases. Our previous study found that the EtOH extract of Cinnamomum chartophyllum protected human bronchial epithelial cells against oxidative insults via Nrf2 activation...
September 14, 2017: Redox Biology
https://www.readbyqxmd.com/read/28942082/elucidation-of-protective-efficacy-of-pentahydroxy-flavone-isolated-from-madhuca-indica-against-arsenite-induced-cardiomyopathy-role-of-nrf-2-ppar-%C3%AE-c-fos-and-c-jun
#4
Anwesha A Mukherjee, Amit D Kandhare, Subhash L Bodhankar
BACKGROUND: Madhuca indica J. F. Gmel. (Sapotaceae) is widely used ethnobotanically as anti-diabetic, antipyretic, hepatoprotective, anti-inflammatory and analgesic. It was shown to possess potent anti-apoptotic property. THE AIM OF THE STUDY: To evaluate the possible mechanism of action of isolated phytoconstituent from Madhuca indica Leaves methanolic extract (MI-ALC) on arsenic-induced cardiotoxicity in rats. MATERIALS AND METHODS: The 3,5,7,3',4'-Pentahydroxy flavone (QTN) was isolated and characterized by using HPTLC, (1)H NMR, and LC-MS from MI-ALC...
September 1, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28941462/skq1-regulates-expression-of-nrf2-are-controlled-genes-encoding-antioxidant-enzymes-and-their-activity-in-cerebral-cortex-under-oxidative-stress
#5
V V Vnukov, O I Gutsenko, N P Milyutina, I V Kornienko, A A Ananyan, A A Plotnikov, S B Panina
The administration of SkQ1 to rats at the dose of 50 nmol/kg for five days significantly increased the mRNA levels of transcription factor Nrf2 and of Nrf2-controlled genes encoding antioxidant enzymes SOD1, SOD2, CAT, and GPx4, whereas changes in the level of mRNA of SOD3 in the cerebral cortex of the rat brain were not significant. This was accompanied by activation of antioxidant enzymes (SOD, CAT, GPx, and GST) and increase in reduced glutathione concentration. Under oxidative stress induced by hyperoxia (0...
August 2017: Biochemistry. Biokhimii︠a︡
https://www.readbyqxmd.com/read/28941211/expression-of-p62-in-hepatocellular-carcinoma-involving-hepatitis-b-virus-infection-and-aflatoxin-b1-exposure
#6
Xiao Xiang, Hong-Gui Qin, Xue-Mei You, Yan-Yan Wang, Lu-Nan Qi, Liang Ma, Bang-De Xiang, Jian-Hong Zhong, Le-Qun Li
This study aims to clarify the relationship and mechanism between expression of autophagy-related protein P62 and prognosis of patients with hepatocellular carcinoma (HCC) involving chronic hepatitis B virus (HBV) infection and aflatoxin B1 (AFB1) exposure. HCC patients who underwent resection were divided into three groups: HBV(+)/AFB1(+) (n = 26), HBV(+)/AFB1(-) (n = 68), and HBV(-)/AFB1(-) (n = 14). The groups were compared in terms of mRNA and protein levels of P62, disease-free survival (DFS), and overall survival (OS) and the expression of NRF2, Nqo1, and AKR7A3 in P62 high-expression and low-expression group...
September 21, 2017: Cancer Medicine
https://www.readbyqxmd.com/read/28940752/supplementation-with-docosahexaenoic-acid-and-extra-virgin-olive-oil-prevents-liver-steatosis-induced-by-a-high-fat-diet-in-mice-through-ppar-%C3%AE-and-nrf2-upregulation-with-concomitant-srebp-1c-and-nf-kb-downregulation
#7
María C Hernández-Rodas, Rodrigo Valenzuela, Francisca Echeverría, Miguel Ángel Rincón-Cervera, Alejandra Espinosa, Paola Illesca, Patricio Muñoz, Alicia Corbari, Nalda Romero, Daniel Gonzalez-Mañan, Luis A Videla
SCOPE: Non alcoholic fatty liver disease (NAFLD) is the most common cause of liver disease, for which there is no validated drug therapy at present time. In this respect, the polyunsaturated fatty acid docosahexaenoic acid (C22:6 n-3, DHA) modulate lipid metabolism in the liver, and extra virgin olive oil (EVOO) has hepatoprotective effects. METHODS AND RESULTS: Effect of combined docosahexaenoic acid (DHA; C22:6 n-3) and extra virgin olive oil (EVOO) administration to mice on oxidative stress and metabolic disturbances induced by high-fat diet (HFD) was evaluated...
September 21, 2017: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/28940008/p21-waf1-cip1-depletion-promotes-dexamethasone-induced-apoptosis-in-osteoblastic-mc3t3-e1-cells-by-inhibiting-the-nrf2-ho-1-pathway
#8
Dandan Han, Jian Gao, Xiaolong Gu, Jan Georg Hengstler, Limei Zhang, Muhammad Shahid, Tariq Ali, Bo Han
Dexamethasone (Dex), a glucocorticoid with strong anti-inflammatory and immunosuppressive activities, has been shown to exhibit marked cytotoxicity and apoptosis in osteoblasts, but the underlying mechanisms have not yet been comprehensively investigated. P21(Waf1/Cip1) (p21) plays a critical role in the regulation of cell cycle progression and apoptosis. The present study aims to investigate the role of p21 in Dex-induced apoptosis in osteoblastic MC3T3-E1 cells, and to explore its mechanisms. Results demonstrated that Dex-induced apoptosis decreased the phosphorylation of Akt in a concentration-dependent manner...
September 22, 2017: Archives of Toxicology
https://www.readbyqxmd.com/read/28939896/mir-155-mediates-arsenic-trioxide-resistance-by-activating-nrf2-and-suppressing-apoptosis-in-lung-cancer-cells
#9
Shiyan Gu, Yanhao Lai, Hongyu Chen, Yuan Liu, Zunzhen Zhang
Arsenic trioxide (ATO) resistance is a challenging problem in chemotherapy. However, the underlying mechanisms remain to be elucidated. In this study, we identified a high level of expression of miR-155 in a human lung adenocarcinoma A549R cell line that is highly resistant to ATO. We showed that the high level of miR-155 was associated with increased levels of cell survival, colony formation, cell migration and decreased cellular apoptosis, and this was mediated by high levels of Nrf2, NAD(P)H quinone oxidoreductase 1 (NQO1), heme oxygenase-1 (HO-1) and a high ratio of Bcl-2/Bax...
September 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28939530/towards-the-modulation-of-oxidative-damage-apoptosis-and-tight-junction-protein-in-response-to-dietary-leucine-deficiency-a-likely-cause-of-ros-induced-gill-structural-integrity-impairment
#10
Wei-Dan Jiang, Yu-Ping Deng, Xiao-Qiu Zhou, Yang Liu, Jun Jiang, Sheng-Yao Kuang, Ling Tang, Wu-Neng Tang, Pei Wu, Yong-An Zhang, Lin Feng
The current study explored the protective effect of leucine on antioxidant status, apoptosis and tight junction damage in the gill of grass carp (Ctenopharyngodon idella Val.). The trial was conducted by feeding grass carp with six graded level of leucine (7.1, 8.9, 11.0, 13.3, 15.2 and 17.1 g kg(-1) diet) for 8 weeks. The fish were fed to apparent satiation 4 times per day. The results indicated that compared with the leucine deficiency group, 8.9-11.3 g leucine kg(-1) diet supplementations decreased protein carbonyl (PC), malondialdehyde (MDA) and ROS contents, which may be partially attributed to the improvement of antioxidant status in the gill by increasing hydroxyl radical capacity and anti-superoxide radicals, glutathione contents and the activities and mRNA levels of Cu/Zn superoxide dismutase (SOD1), glutathione peroxidase (GPx), catalase (CAT), glutathione-S-transferase (GST) and glutathione reductase (GR), that referring to the up-regulation of nuclear factor erythroid 2-related factor 2 (Nrf2) mRNA expression...
September 19, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28939422/suppressed-ubiquitination-of-nrf2-by-p47-phox-contributes-to-nrf2-activation
#11
Kyun Ha Kim, Ruxana T Sadikot, Ji Yeon Lee, Han-Sol Jeong, Yu-Kyoung Oh, Timothy S Blackwell, Myungsoo Joo
Although critical in phagocytosis in innate immunity, reactive oxygen species (ROS) collaterally inflict damage to host phagocytes because they indiscriminate targets. Since Nrf2 increases the expression of anti-oxidant enzymes that nullifies ROS, ROS activating Nrf2 is a critical negative regulatory step for countering the deleterious effects of ROS. Here, we postulate whether, along with ROS activating Nrf2, NADPH oxidase components also participate in direct activation of Nrf2, contributing to protection from ROS...
September 19, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28939421/theaflavin-ameliorates-ionizing-radiation-induced-hematopoietic-injury-via-the-nrf2-pathway
#12
Xiaodan Han, Junling Zhang, Xiaolei Xue, Yu Zhao, Lu Lu, Ming Cui, Weimin Miao, Saijun Fan
It has been well established that reactive oxygen species (ROS) play a critical role in ionizing radiation (IR)-induced hematopoietic injury. Theaflavin (TF), a polyphenolic compound from black tea, has been implicated in the regulation of endogenous cellular antioxidant systems. However, it remains unclear whether TF could ameliorate IR-induced hematopoietic injury, particularly the hematopoietic stem cell (HSC) injury. In this study, we explored the potential role of TF in IR-induced HSC injury and the underlying mechanism in a total body irradiation (TBI) mouse model...
September 19, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28938631/microrna-455-targets-cullin-3-to-activate-nrf2-signaling-and-protect-human-osteoblasts-from-hydrogen-peroxide
#13
Dawei Xu, Hao Zhu, Chengniu Wang, Xinhui Zhu, Genxiang Liu, Chu Chen, Zhiming Cui
Over-production of hydrogen peroxide (H2O2) will lead to human osteoblast dysfunction and apoptosis, causing progression of osteoporosis and osteonecrosis. NF-E2-related factor 2 (Nrf2) is a well-characterized anti-oxidant signaling. Cullin 3 (Cul3) ubiquitin E3 ligase dictates Nrf2 degradation. We demonstrate that microRNA-455 ("miR-455") is a putative Cul3-targeting microRNA. Forced-expression of miR-455 in both hFOB1. 19 osteoblast cell line and primary human osteoblasts induced Cul3 degradation and Nrf2 protein stabilization, which led to subsequent transcription of ARE (anti-oxidant response element)-dependent genes (NQO1, HO1 and GCLC)...
August 29, 2017: Oncotarget
https://www.readbyqxmd.com/read/28937603/proteome-stability-as-a-key-factor-of-genome-integrity
#14
REVIEW
Sentiljana Gumeni, Zoi Evangelakou, Vassilis G Gorgoulis, Ioannis P Trougakos
DNA damage is constantly produced by both endogenous and exogenous factors; DNA lesions then trigger the so-called DNA damaged response (DDR). This is a highly synchronized pathway that involves recognition, signaling and repair of the damage. Failure to eliminate DNA lesions is associated with genome instability, a driving force in tumorigenesis. Proteins carry out the vast majority of cellular functions and thus proteome quality control (PQC) is critical for the maintenance of cellular functionality. PQC is assured by the proteostasis network (PN), which under conditions of proteome instability address the triage decision of protein fold, hold, or degrade...
September 22, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28935570/molecular-alterations-in-a-mouse-cardiac-model-of-friedreich-s-ataxia-an-impaired-nrf2-response-mediated-via-up-regulation-of-keap1-and-activation-of-the-gsk3%C3%AE-axis
#15
Amy Anzovino, Shannon Chiang, Bronwyn E Brown, Clare L Hawkins, Des R Richardson, Michael L-H Huang
Nuclear factor-erythroid 2-related factor-2 (Nrf2) is a master regulator of the anti-oxidant response. However, studies in models of Friedreich's ataxia (FA), a neuro- and cardio-degenerative disease associated with oxidative stress, reported decreased Nrf2 expression due to unknown mechanisms. Using a mouse conditional frataxin knockout (KO) model in the heart and skeletal muscle, we examined the Nrf2 pathway in these tissues. Frataxin KO results in fatal cardiomyopathy, while skeletal muscle was asymptomatic...
September 18, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/28935427/hesperidin-protects-against-chemically-induced-hepatocarcinogenesis-via-modulation-of-nrf2-are-ho-1-ppar%C3%AE-and-tgf-%C3%AE-1-smad3-signaling-and-amelioration-of-oxidative-stress-and-inflammation
#16
Ayman M Mahmoud, Hanaa M Mohammed, Sally M Khadrawy, Sanaa R Galaly
Hesperidin is a plant-derived bioflavonoid with promising antitumor efficacy, though the underlying mechanisms of action remain poorly elucidated. Thus, we evaluated the in vivo chemopreventive effect of hesperidin against diethylnitrosamine (DEN)-induced hepatocarcinogenesis. We demonstrated the modulatory effect of hesperidin on Nrf2/ARE/HO-1, PPARγ and TGF-β1/Smad3 signaling. Hepatocarcinogenesis was initiated with DEN and promoted with carbon tetrachloride (CCl4). DEN/CCl4-induced rats were treated with 50 and 100 mg/kg hesperidin throughout the experiment...
September 18, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/28935193/celastrol-inhibits-hepatitis-c-virus-replication-by-upregulating-heme-oxygenase-1-via-the-jnk-mapk-nrf2-pathway-in-human-hepatoma-cells
#17
Chin-Kai Tseng, Sung-Po Hsu, Chun-Kuang Lin, Yu-Hsuan Wu, Jin-Ching Lee, Kung-Chia Young
BACKGROUND AND PURPOSE: Celastrol, a quinone methide triterpene isolated from the root extracts of Tripterygium wilfordii, can greatly induce the gene expression activity of heme oxygenase-1 (HO-1) to achieve disease prevention and control. HO-1 induction was recently shown to result in anti-HCV activity by inducing type I interferon and inhibiting hepatitis C virus (HCV) NS3/4A protease activity. The aim of the present study is to evaluate the anti-HCV activity of celastrol and characterize its mechanism of inhibition...
September 18, 2017: Antiviral Research
https://www.readbyqxmd.com/read/28934922/inhibition-of-phosphatidylinositide-3-kinase-impairs-the-benzyl-isothiocyanate-induced-accumulation-of-autophagic-molecules-and-nrf2-in-human-colon-cancer-cells
#18
Xiaoyang Liu, Naomi Abe-Kanoh, Yujia Liu, Beiwei Zhu, Shintaro Munemasa, Toshiyuki Nakamura, Yoshiyuki Murata, Yoshimasa Nakamura
The regulating role of phosphatidylinositide 3-kinase (PI3K) in benzyl isothiocyanate (BITC)-induced Nrf2 activation, contributing to the inducible expression of cytoprotective genes, was investigated. BITC significantly enhanced the accumulation of Nrf2 as well as autophagic molecules in human colorectal cancer HCT-116 cells. Experiments using a PI3K-specific inhibitor suggested that PI3K plays the key role in the non-canonical Nrf2 activation by BITC.
September 22, 2017: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/28934742/elevated-apoptosis-in-the-liver-of-dairy-cows-with-ketosis
#19
Xiliang Du, Liang Chen, Dan Huang, Zhicheng Peng, Chenxu Zhao, Yuming Zhang, Yiwei Zhu, Zhe Wang, Xinwei Li, Guowen Liu
BACKGROUND/AIMS: Dairy cows with ketosis are characterized by oxidative stress and hepatic damage. The aim of this study was to investigate hepatic oxidative stress and the apoptotic status of ketotic cows, as well as the underlying apoptosis pathway. METHODS: The blood aspartate aminotransferase (AST), alanine aminotransferase (ALT), glutamate dehydrogenase (GLDH) and gamma-glutamyl transferase (GGT) activities and the haptoglobin (HP), serum amyloid A (SAA) and serum apoptotic cytokeratin 18 neo-epitope M30 (CK18 M30) concentrations were determined by commercially available kits and ELISA kits, respectively...
September 21, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28933492/the-hepatoprotective-effect-of-the-probiotic-clostridium-butyricum-against-carbon-tetrachloride-induced-acute-liver-damage-in-mice
#20
Jiaming Liu, Yaoyang Fu, Hao Zhang, Jindan Wang, Jing Zhu, Yaqi Wang, Yuegui Guo, Guocan Wang, Tianqi Xu, Maoping Chu, Fangyan Wang
Previous studies have revealed that the probiotic Clostridium butyricum (C. butyricum) can attenuate cirrhosis in chronic non-alcoholic liver disease. However, the effects of C. butyricum on acute liver injury (ALI) remain unclear. Therefore, the present study aims to examine the hepatoprotective effects and the underlying mechanisms employed by C. butyricum in a carbon tetrachloride (CCl4)-induced ALI murine model. Here, we evaluated the survival rate and the levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), anti-oxidants, cytokines and the gut microbiota to elucidate the potential mechanisms by which C...
September 21, 2017: Food & Function
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