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https://www.readbyqxmd.com/read/28630072/pseudomonas-quinolone-signal-pqs-induces-oxidative-stress-and-inhibits-heme-oxygenase-1-expression-in-lung-epithelial-cells
#1
Maher Y Abdalla, Traci Hoke, Javier Seravalli, Barbara L Switzer, Melissa Bavitz, Jill D Fliege, Peter J Murphy, Bradley E Britigan
Pseudomonas aeruginosa (PA) causes lung infection in patients with cystic fibrosis (CF). Pseudomonas Quinolone Signal (PQS) is a secreted PA virulence factor that contributes to the pathogenicity of PA. We were able to detect PQS in sputum samples from CF patients infected with PA, but not in samples from uninfected patients. We then tested the hypothesis that PQS induces oxidative stress in host cells by determining the ability of PQS to induce production of reactive oxygen species (ROS) in lung epithelial cells (A549 and primary normal human bronchial epithelial (NHBE)) and macrophages (J774A...
June 19, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28590009/effect-of-rmnsod-on-sodium-reabsorption-in-renal-proximal-tubule-in-ochratoxin-a-treated-rats
#2
Sara Damiano, Maria Valeria Puzio, Caterina Squillacioti, Nicola Mirabella, Enrica Zona, Aldo Mancini, Antonella Borrelli, Carlo Astarita, Silvia Boffo, Antonio Giordano, Luigi Avallone, Salvatore Florio, Roberto Ciarcia
Ochratoxin A (OTA) is a mycotoxin produced by Aspergillus and Penicillium that represent toxic real threat for human beings and animal health. In this study we evaluated the effect of a new recombinant mitochondrial manganese containing superoxide dismutase (rMnSOD) on oxidative stress and on the alterations of fluid reabsorption in renal proximal tubule (PT) as possible causes of OTA nephrotoxicity. Finally, we have measured the concentration of O2(-) in the kidney through dihydroethidium assay (DHE) and nitric oxide (NO) concentration through nitrites and nitrates assay...
June 7, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28588678/mechanism-of-n-acetyl-cysteine-inhibition-on-the-cytotoxicity-induced-by-titanium-dioxide-nanoparticles-in-jb6-cells-transfected-with-activator-protein-1
#3
Hongbo Shi, Yuanliang Gu, Zhenhua Xie, Qi Zhou, Guochuan Mao, Xialu Lin, Kui Liu, Yu Liu, Baobo Zou, Jinshun Zhao
The present study investigated the mechanism of N-acetyl-cysteine (NAC) inhibition on the cytotoxicity induced by titanium dioxide (TiO2) nanoparticles (NPs) using murine epidermal JB6 cells transfected with activator protein-1 (AP-1), JB6-AP-1 cells. Confocal microscopy was performed to localize TiO2 NPs in cultured cells. The level of reactive oxygen species (ROS) present in cells was evaluated by staining with 2',7'-dichlorodihydrofluorescein diacetate and dihydroethidium. AP-1 gene expression levels in the cells were detected using the luciferase assay...
June 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28573935/the-nadph-oxidase-inhibitor-apocynin-suppresses-preneoplastic-liver-foci-of-rats
#4
Satoshi Fuji, Shugo Suzuki, Aya Naiki-Ito, Hiroyuki Kato, Masashi Hayakawa, Yoriko Yamashita, Toshiya Kuno, Satoru Takahashi
Reactive oxygen species (ROS) have been revealed to be important factors for carcinogenesis and tumor progression. Therefore, we focused on an ROS-generating protein, nicotinamide adenine dinucleotide phosphate oxidase, and evaluated whether its inhibitor, apocynin, could suppress hepatocarcinogenesis in a medium-term rat liver bioassay. The number and size of glutathione S-transferase placental form (GST-P)-positive foci were significantly reduced by apocynin in a dose-dependent manner. The reduction of ROS generation by apocynin was confirmed by dihydroethidium staining...
January 1, 2017: Toxicologic Pathology
https://www.readbyqxmd.com/read/28562691/chronic-treatment-with-paeonol-improves-endothelial-function-in-mice-through-inhibition-of-endoplasmic-reticulum-stress-mediated-oxidative-stress
#5
Ker Woon Choy, Yeh Siang Lau, Dharmani Murugan, Mohd Rais Mustafa
Endoplasmic reticulum (ER) stress leads to endothelial dysfunction which is commonly associated in the pathogenesis of several cardiovascular diseases. We explored the vascular protective effects of chronic treatment with paeonol (2'-hydroxy-4'-methoxyacetophenone), the major compound from the root bark of Paeonia suffruticosa on ER stress-induced endothelial dysfunction in mice. Male C57BL/6J mice were injected intraperitoneally with ER stress inducer, tunicamycin (1 mg/kg/week) for 2 weeks to induce ER stress...
2017: PloS One
https://www.readbyqxmd.com/read/28556994/hyperglycemia-in-pregnant-rats-causes-gender-related-vascular-dysfunction-in-adult-offspring-role-of-cyclooxygenase-2
#6
Francine Gomes de Sá, Diego Barbosa de Queiroz, Fernanda Elizabethe Ramos-Alves, Juliana Santos-Rocha, Odair Alves da Silva, Hicla Steffany Moreira, Geórgia Andrade Leal, Marcelo Aurélio da Rocha, Gloria Pinto Duarte, Fabiano Elias Xavier
Exposure to maternal hyperglycemia induces hypertension and vascular dysfunction in adult male offspring. Because female offspring from several fetal programming models are protected from the effects of fetal insult, in this study we analyzed possible differences relative to gender in blood pressure and vascular function in hyperglycemia-programmed offspring. Hyperglycemia was induced on gestation day 7 (streptozotocin, 50 mg.kg(-1) ). Blood pressure, acetylcholine and phenylephrine/noradrenaline responses were analyzed in aorta and mesenteric resistance arteries (MRA) of 3-, 6- and 12-month-old male and female offspring...
May 30, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28552746/chronic-administration-of-sodium-nitrite-prevents-hypertension-and-protects-arterial-endothelial-function-by-reducing-oxidative-stress-in-angiotensin-ii-infused-mice
#7
Wei Chih Ling, Mohd Rais Mustafa, Paul M Vanhoutte, Dharmani Devi Murugan
AIM: Endothelial dysfunction accompanied by an increase in oxidative stress is a key event leading to hypertension. As dietary nitrite has been reported to exert antihypertensive effect, the present study investigated whether chronic oral administration of sodium nitrite improves vascular function in conduit and resistance arteries of hypertensive animals with elevated oxidative stress. METHODS: Sodium nitrite (50mg/L) was given to angiotensin II-infused hypertensive C57BL/6J (eight to ten weeks old) mice for two weeks in the drinking water...
May 26, 2017: Vascular Pharmacology
https://www.readbyqxmd.com/read/28546827/chemical-constituents-from-a-gynostemma-laxum-and-their-antioxidant-and-neuroprotective-activities
#8
Ji Yeon Seo, Sang Kyum Kim, Phi Hung Nguyen, Ju Yong Lee, Pham Ha Thanh Tung, Sang Hyun Sung, Won Keun Oh
BACKGROUND: A few bioactivities of constituents from Gynostemma laxum, which has been collected in Vietnam, have been reported until now. There is no report about the effects of constituents from G. laxum although the nuclear factor (erythroid-derived 2)-like 2 (Nrf2)-mediated heme oxygenase-1 (HO-1) antioxidant defense system is involved in neuroprotection in the brain. Therefore, we investigated whether quercetin (2), benzoic acid (10) and their analogues (1, 3-9 and 11) from G. laxum have the antioxidant and neuroprotective activities and also their underlying mechanism...
2017: Chinese Medicine
https://www.readbyqxmd.com/read/28524456/endothelial-microparticles-released-by-activated-protein-c-protect-beta-cells-through-epcr-par1-and-annexin-a1-fpr2-pathways-in-islets
#9
Guillaume Kreutter, Mohamad Kassem, Ali El Habhab, Philippe Baltzinger, Malak Abbas, Julie Boisrame-Helms, Lamia Amoura, Jean Peluso, Blandine Yver, Zobairi Fatiha, Geneviève Ubeaud-Sequier, Laurence Kessler, Florence Toti
Islet transplantation is associated with early ischaemia/reperfusion, localized coagulation and redox-sensitive endothelial dysfunction. In animal models, islet cytoprotection by activated protein C (aPC) restores islet vascularization and protects graft function, suggesting that aPC triggers various lineages. aPC also prompts the release of endothelial MP that bear EPCR, its specific receptor. Microparticles (MP) are plasma membrane procoagulant vesicles, surrogate markers of stress and cellular effectors...
May 19, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28484701/dual-specificity-phosphatase-4-overexpression-in-cells-prevents-hypoxia-reoxygenation-induced-apoptosis-via-the-upregulation-of-enos
#10
Julie A Dougherty, Joanna Kilbane Myers, Mahmood Khan, Mark G Angelos, Chun-An Chen
Mitogen-activated protein kinases (MAPKs) signaling cascades regulate several cellular functions, including differentiation, proliferation, survival, and apoptosis. The duration and magnitude of phosphorylation of these MAPKs are decisive determinants of their physiological functions. Dual-specificity phosphatases exert kinetic control over these signaling cascades. Previously, we demonstrated that DUSP4(-/-) hearts sustain a larger infarct and have poor functional recovery, when isolated hearts were subjected to ischemia/reperfusion...
2017: Frontiers in Cardiovascular Medicine
https://www.readbyqxmd.com/read/28482326/constitutive-activation-of-nrf2-induces-a-stable-reductive-state-in-the-mouse-myocardium
#11
Gobinath Shanmugam, Madhusudhanan Narasimhan, Susan Tamowski, Victor Darley-Usmar, Namakkal S Rajasekaran
Redox homeostasis regulates key cellular signaling pathways in both physiology and pathology. The cell's antioxidant response provides a defense against oxidative stress and establishes a redox tone permissive for cell signaling. The molecular regulation of the well-known Keap1/Nrf2 system acts as sensor responding to changes in redox homeostasis and is poorly studied in the heart. Importantly, it is not yet known whether Nrf2 alone can serve as a master regulator of cellular redox homeostasis without compensation of the transcriptional regulation of antioxidant response element (ARE) genes through alternate mechanisms...
August 2017: Redox Biology
https://www.readbyqxmd.com/read/28474156/jnk-inhibitor-sp600125-attenuates-paraquat-induced-acute-lung-injury-an-in-vivo-and-in-vitro-study
#12
Haitao Shen, Na Wu, Yu Wang, Xinfei Han, Qiang Zheng, Xue Cai, Honglei Zhang, Min Zhao
Acute lung injury (ALI) is a major complication soon after paraquat poisoning and rapidly progresses with high mortality. However, the specific mechanism underlying paraquat-induced ALI is still unclear. In this study, the mechanism underlying the protective effects of SP600125 on paraquat-induced ALI was investigated according to oxidative stress, inflammation, and apoptosis. The rats were randomly assigned into the control group (CON), the paraquat poisoning group (PQ), and the PQ + SP600125 group (SP). A549 cells were divided into the Con group, Pq group, and Sp group...
May 4, 2017: Inflammation
https://www.readbyqxmd.com/read/28459937/cxcl16-deficiency-attenuates-acetaminophen-induced-hepatotoxicity-through-decreasing-hepatic-oxidative-stress-and-inflammation-in-mice
#13
Hong Wang, Yihui Shao, Saisai Zhang, Anqi Xie, Yanna Ye, Lihua Shi, Leigang Jin, Xuebo Pan, Zhuofeng Lin, Xiaokun Li, Shulin Yang
Chemokine C-X-C ligand 16 (CXCL16), a single-pass Type I membrane protein belonging to the CXC chemokine family, is related to the inflammatory response in liver injury. In present study, we investigated the pathophysiological role of CXCL16, a unique membrane-bound chemokine, in acetaminophen (APAP)-induced hepatotoxicity in mice. Mice were injected with APAP, and blood and tissue samples were harvested at different time points. The serum high-mobility group box 1 and CXCL16 levels were quantified by sandwich immunoassays...
June 1, 2017: Acta Biochimica et Biophysica Sinica
https://www.readbyqxmd.com/read/28456572/treatment-with-sodium-nitroprusside-improves-the-endothelial-function-in-aortic-rings-with-endothelial-dysfunction
#14
Tereza Cristina Buzinari, Jorge Camargo Oishi, Thiago Francisco De Moraes, Izabela Pereira Vatanabe, Heloisa Sobreiro Selistre-de-Araújo, Cezar Rangel Pestana, Gerson Jhonatan Rodrigues
PURPOSE: Verify if sodium nitroprusside (SNP) is able to improve endothelial function and if this effect is independent of nitric oxide (NO) release of the compound. METHODS: Normotensive (2K) and hypertensive (2K-1C) wistar rats were used. Intact endothelium aortas were placed in a myograph and incubated with SNP: 0.1nM; 1nM or 10nM during 30min. Cumulative concentration-effect curves for acetylcholine (Ach) were realized to measure the relaxing capacity. Intracellular NO were measured (by DAF-2DA probe) in HUVEC treated with SNP 0...
April 27, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28455949/detection-of-intracellular-reactive-oxygen-species-superoxide-anion-and-hydrogen-peroxide-and-lipid-peroxidation-during-cryopreservation-of-alpaca-spermatozoa
#15
S Evangelista-Vargas, A Santiani
The objective of this study was to detect changes in intracellular reactive oxygen species (superoxide anion and hydrogen peroxide) production and lipid peroxidation during cryopreservation of alpaca spermatozoa. Twelve alpaca semen samples were conventionally cryopreserved. Intracellular superoxide anion and hydrogen peroxide were evaluated by fluorescence microscopy using dihydroethidium (DHE)/YO-PRO-1 and dichlorofluorescein diacetate (H2DCFDA)/propidium iodide (PI), respectively. Evaluations were performed during cooling curve at (1) 25°C, (2) 15°C, (3) 5°C/0 min, (4) 5°C/15 min, (5) 5°C/30 min and (6) after freezing/thawing...
April 29, 2017: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/28409500/tissue-protective-activity-of-selenomethionine-and-d-panthetine-in-b16-melanoma-bearing-mice-under-doxorubicin-treatment-is-not-connected-with-their-ros-scavenging-potential
#16
Rostyslav R Panchuk, Nadia R Skorokhyd, Yuliya S Kozak, Liliya V Lehka, Andrey G Moiseenok, Rostyslav S Stoika
AIM: To evaluate molecular mechanisms of tissue-protective effects of antioxidants selenomethionine (SeMet) and D-pantethine (D-Pt) applied in combination with doxorubicin (Dx) in B16 melanoma-bearing-mice. METHODS: Impact of the chemotherapy scheme on a survival of tumor-bearing animals, general nephro- and hepatotoxicity, blood cell profile in vivo, and ROS content in B16 melanoma cells in vitro was compared with the action of Dx applied alone. Nephrotoxicity of the drugs was evaluated by measuring creatinine indicator assay, hepatotoxicity was studied by measuring the activity of ALT/AST enzymes, and myelotoxicity was assessed by light microscopic analysis of blood smears...
April 14, 2017: Croatian Medical Journal
https://www.readbyqxmd.com/read/28401647/mg53-anchored-by-dysferlin-to-cell-membrane-reduces-hepatocyte-apoptosis-which-induced-by-ischaemia-reperfusion-injury-in%C3%A2-vivo-and-in%C3%A2-vitro
#17
Weifeng Yao, Haobo Li, Xue Han, Chaojin Chen, Yihan Zhang, Wai Lydia Tai, Zhengyuan Xia, Ziqing Hei
Hepatic ischaemia/reperfusion (HIR) induces severe damage on hepatocyte cell membrane, which leads to hepatocyte death and the subsequent HIR injury. In this study, we investigated the role and the mechanism of mitsugumin-53 (MG53), a novel cell membrane repair protein, in protecting the liver against HIR injury. Rats were subjected to sham operation or 70% warm HIR with or without recombined MG53 (rhMG53), caudal vein-injected 2 hrs before inducing HIR. In vitro, cultured hepatocyte AML12 cells were subjected to hypoxia/reoxygenation (H/R) in the presence of rhMG53 and/or dysferlin gene shRNAs or adenovirus transfection...
April 12, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28396195/treatment-with-salvianolic-acid-b-restores-endothelial-function-in-angiotensin-ii-induced-hypertensive-mice
#18
Wei Chih Ling, Jian Liu, Chi Wai Lau, Dharmani Devi Murugan, Mohd Rais Mustafa, Yu Huang
Salvianolic acid B (Sal B) is one of the most abundant phenolic acids derived from the root of Danshen with potent anti-oxidative properties. The present study examined the vasoprotective effect of Sal B in hypertensive mice induced by angiotensin II (Ang II). Sal B (25mg/kg/day) was administered via oral gavage for 11days to Ang II (1.2mg/kg/day)-infused C57BL/6J mice (8-10weeks old). The vascular reactivity (both endothelium-dependent relaxations and contractions) in mouse arteries was examined by wire myography...
July 15, 2017: Biochemical Pharmacology
https://www.readbyqxmd.com/read/28393248/epigallocatechin-3-gallate-ameliorates-insulin-resistance-in-hepatocytes
#19
Shan-Bo Ma, Rui Zhang, Shan Miao, Bin Gao, Yang Lu, Sen Hui, Long Li, Xiao-Peng Shi, Ai-Dong Wen
Hyperglycemia is a typical pathogenic factor in a series of complications among patients with type II diabetes. Epigallocatechin-3-gallate (EGCG) is the major polyphenol extracted from green tea and is reported to be an antioxidant. The aim of the present study was to examine the effect of EGCG on insulin resistance in human HepG2 cells pretreated with high concentrations of glucose. The protein kinase B (AKT)/glycogen synthase kinase (GSK) pathways were analyzed using western blot analysis in HepG2 cells and primary mouse hepatocytes treated with high glucose and/or EGCG...
June 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28365916/pigment-epithelium-derived-factor-pedf-prevents-hepatic-fat-storage-inflammation-and-fibrosis-in-dietary-steatohepatitis-of-mice
#20
Takafumi Yoshida, Jun Akiba, Takanori Matsui, Kazuo Nakamura, Takao Hisamoto, Mitsuhiko Abe, Yu Ikezono, Fumitaka Wada, Hideki Iwamoto, Toru Nakamura, Hironori Koga, Sho-Ichi Yamagishi, Takuji Torimura
BACKGROUND AND AIMS: Pigment epithelium-derived factor (PEDF) has been shown to be a potent inhibitor of inflammation through its anti-oxidative property. Since oxidative response is considered to play the pivotal role of the development and progression of nonalcoholic steatohepatitis (NASH), it is conceivable that PEDF may play a protective role against NASH. In this study, we examined whether administration of PEDF slowed the progression of NASH in mice models. METHODS: Mice were fed methionine- and choline-deficient (MCD) diet with or without intramuscular administration of adenovirus-expressing PEDF (Ad-PEDF)...
April 1, 2017: Digestive Diseases and Sciences
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