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https://www.readbyqxmd.com/read/29217357/tempol-prevents-post-traumatic-stress-disorder-induced-memory-impairment
#1
Karem H Alzoubi, Abeer M Rababa'h, Omar N Yaqoub
Post-traumatic stress disorder (PTSD) is a mental health disorder that can develop after a terrifying or life threatening event. Multiple symptoms are noticed in patients with PTSD including cognitive impairment, which was shown to be is associated with oxidative stress. Tempol is a highly efficient membrane-permeable antioxidant. In this study, we investigated the possible protective effect of tempol on PTSD-induced memory impairment. To test this hypothesis, we used single prolonged stress (SPS) model (2h restrain, 20min forced swimming, 15min rest, and 1-2min diethyl ether exposure) as a model of PTSD...
December 4, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/29210997/tempol-supplementation-restores-diaphragm-force-and-metabolic-enzyme-activities-in-mdx-mice
#2
David P Burns, Izza Ali, Clement Rieux, James Healy, Greg Jasionek, Ken D O'Halloran
Duchenne muscular dystrophy (DMD) is characterized by striated muscle weakness, cardiomyopathy, and respiratory failure. Since oxidative stress is recognized as a secondary pathology in DMD, the efficacy of antioxidant intervention, using the superoxide scavenger tempol, was examined on functional and biochemical status of dystrophin-deficient diaphragm muscle. Diaphragm muscle function was assessed, ex vivo, in adult male wild-type and dystrophin-deficient mdx mice, with and without a 14-day antioxidant intervention...
December 6, 2017: Antioxidants (Basel, Switzerland)
https://www.readbyqxmd.com/read/29207011/astragaloside-iv-prevents-kidney-injury-caused-by-iatrogenic-hyperinsulinemia-in-a-streptozotocin%C3%A2-induced-diabetic-rat-model
#3
Ke-Qiang He, Wei-Zu Li, Xiao-Qing Chai, Yan-Yan Yin, Yan Jiang, Wei-Ping Li
Diabetic patients are able to manage their blood glucose with exogenous insulin but, ultimately, remain at risk of diabetic nephropathy (DN). Long‑term use of insulin may lead to iatrogenic hyperinsulinemia, which has been suggested to cause kidney injury. However, there are no effective interventions for iatrogenic hyperinsulinemia leading to kidney damage. In the present paper, the hypothesis that astragaloside IV (AS‑IV), a novel saponin purified from Astragalus membranaceus (Fisch) Bunge, may prevent DN in iatrogenic hyperinsulinemic diabetic rats through antioxidative and anti‑inflammatory mechanisms was investigated...
November 17, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29196315/phosphorylated-ccaat-enhancer-binding-protein-%C3%AE-contributes-to-rat-hiv-related-neuropathic-pain-in-vitro-and-in-vivo-studies
#4
Hyun Yi, Shue Liu, Yuta Kashiwagi, Daigo Ikegami, Wan Huang, Hirotsugu Kanda, Takafumi Iida, Ching-Hang Liu, Keiya Takahashi, David A Lubarsky, Shuanglin Hao
Chronic pain is increasingly recognized as an important comorbidity of HIV-infected patients, however, the exact molecular mechanisms of HIV-related pain are still elusive. CCAAT/enhancer binding proteins (C/EBPs) are expressed in various tissues, including the central nervous system. C/EBPβ, one of C/EBPs is involved in the progression of HIV/AIDS, but the exact role of C/EBPβ and its upstream factors are not clear in HIV pain state. Here, we used a neuropathic pain model of perineural HIV envelope glycoprotein gp120 application onto the rat sciatic nerve to test the role of phosphorylated C/EBPβ (pC/EBPβ) and its upstream pathway in the spinal cord dorsal horn (SCDH)...
December 1, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29192783/mesodomain-and-protein-associated-solvent-phases-with-temperature-tunable-200-265-k-dynamics-surround-ethanolamine-ammonia-lyase-in-globally-polycrystalline-aqueous-solution-containing-dimethyl-sulfoxide
#5
Benjamen Nforneh, Kurt Warncke
Electron paramagnetic resonance spectroscopy of the spin probe, TEMPOL, is used to resolve solvent phases that surround the ethanolamine ammonia-lyase (EAL) protein from Salmonella typhimurium at low temperature (T) in frozen, globally polycrystalline aqueous solution and to report on the T dependence of their detectably rigid and fluid states. EAL plays a role in human gut microbiome-based disease conditions, and physicochemical studies provide insight into protein structure and mechanism, toward potential therapeutics...
December 1, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29183754/nitroxide-tempol-down-regulates-kinase-activities-associated-with-nadph-oxidase-function-in-phagocytic-cells-and-potentially-decreases-their-fungicidal-response
#6
Gérsika B Santos, Ana C G Ribeiro, Samuel N P Lima, Andrés Trostchansky, Cláudio Daniel Cerdeira, Maísa R P L Brigagão
AIMS: The identification of novel targets to control inflammation in humans is probably the primary challenge that impairs the development of new anti-inflammatory drugs. Therefore, the modulation of intracellular signaling pathways in phagocytes may be an interesting means of achieving this goal. However, this change to signaling can compromise the host's susceptibility to invading pathogens. We investigated whether the antioxidant nitroxide Tempol regulates the activity of kinases associated with the production of oxidants in neutrophils, which affects the fungicidal capability of these cells...
November 25, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/29183043/benzo-e-pyrene-inhibits-endothelium-dependent-no-mediated-dilation-of-retinal-arterioles-via-superoxide-production-and-endoplasmic-reticulum-stress
#7
Takayuki Kamiya, Taiji Nagaoka, Tsuneaki Omae, Shinji Ono, Shinichi Otani, Akitoshi Yoshida
Purpose: To investigate whether benzo(e)pyrene (B(e)P), a toxicant in cigarette smoke, affects the endothelium-dependent nitric oxide (NO)-induced vasodilation of the retinal arterioles, and whether oxidative stress, distinct protein kinase signaling pathways, and endoplasmic reticulum (ER) stress are associated with the B(e)P-induced effect on the retinal arterioles. Methods: In this in vitro study, porcine retinal arterioles were isolated, cannulated, and pressurized without flow...
November 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29180450/knockout-of-mitochondrial-voltage-dependent-anion-channel-type-3-increases-reactive-oxygen-species-ros-levels-and-alters-renal-sodium-transport
#8
Li Zou, Valerie Linck, Yu-Jia Zhai, Laura Galarza-Paez, Linda Li, Qiang Yue, Otor Al-Khalili, Hui-Fang Bao, He-Ping Ma, Tiffany L Thai, Jundong Jiao, Douglas C Eaton
It has been suggested that voltage-dependent anion channels (VDACs) control the release of superoxide from mitochondria. We have previously shown that reactive oxygen species (ROS) such as superoxide (O2-) and hydrogen peroxide (H2O2) stimulate epithelial sodium channels (ENaCs) in sodium-transporting epithelial tissue including cortical collecting duct (CCD) principal cells. Therefore, we hypothesized that VDACs could regulate ENaC by modulating cytosolic ROS levels. Herein, we find that VDAC3-knockout(KO) mice can maintain normal salt and water balance on low-salt and high-salt diets...
November 27, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29165102/radio-protective-effect-and-mechanism-of-4-acetamido-2-2-6-6-tetramethylpiperidin-1-oxyl-in-huvec-cells
#9
Feng Wang, Peng Gao, Ling Guo, Ping Meng, Yuexing Fan, Yongbin Chen, Yanyun Lin, Guozhen Guo, Guirong Ding, Haibo Wang
OBJECTIVES: To search for more effective radiation protectors with minimal toxicity, a water-soluble nitroxides Acetamido-Tempol (AA-Tempol) was evaluated for potential radioprotective properties in HUVEC cells (Human Umbilical Vein Endothelial cell line). METHODS: To study the anti-radiation effect of AA-Tempol in cell culture, the viability of irradiated HUVEC cells using a clonogenic survival assay was examined. The anti-apoptosis effects of AA-Tempol using Annexin V/propidium iodide staining in a flow cytometry assay was also evaluated...
March 24, 2017: Environmental Health and Preventive Medicine
https://www.readbyqxmd.com/read/29158353/blood-pressure-control-by-a-secreted-fgfbp1-fibroblast-growth-factor-binding-protein
#10
Elena Tassi, En Yin Lai, Lingli Li, Glenn Solis, Yifan Chen, William E Kietzman, Patricio E Ray, Anna T Riegel, William J Welch, Christopher S Wilcox, Anton Wellstein
Fibroblast growth factors (FGFs) participate in organ development and tissue maintenance, as well as the control of vascular function. The paracrine-acting FGFs are stored in the extracellular matrix, and their release is controlled by a secreted FGF-binding protein (FGF-BP, FGFBP1, and BP1) that modulates FGF receptor signaling. A genetic polymorphism in the human FGFBP1 gene was associated with higher gene expression and an increased risk of familial hypertension. Here, we report on the effects of inducible BP1 expression in a transgenic mouse model...
November 20, 2017: Hypertension
https://www.readbyqxmd.com/read/29146611/smooth-muscle-selective-nuclear-factor-%C3%AE%C2%BAb-inhibition-reduces-phosphate-induced-arterial-medial-calcification-in-mice-with-chronic-kidney-disease
#11
Tadashi Yoshida, Maho Yamashita, Chihiro Horimai, Matsuhiko Hayashi
BACKGROUND: Hyperphosphatemia is a major factor promoting the formation of arterial medial calcification in chronic kidney disease (CKD). However, arterial medial calcification begins to occur during the early stages of CKD, when hyperphosphatemia is not yet apparent. It is predicted that other factors also play a role. The aim of the present study was to determine the role of pro-inflammatory nuclear factor-κB (NF-κB) signaling in smooth muscle cells (SMCs) for phosphate-induced arterial medial calcification in CKD mice...
November 16, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29137484/the-role-of-endogenous-reactive-oxygen-species-in-cardiac-myocyte-autophagy
#12
J-P Wang, R-F Chi, J Liu, Y-Z Deng, X-B Han, F-Z Qin, B Li
Autophagy is implicated in the maintenance of cardiac homeostasis. Autophagy is activated in heart failure, in which reactive oxygen species (ROS) are increased. Exogenous ROS have been shown to induce cardiomyocyte autophagy alterations. However, little is known about the influences of physiological levels of endogenous ROS on cardiomyocyte autophagy. In the present study, we tested the hypothesis that endogenous ROS in cardiomyocytes play an important role in inducing autophagy. Cultured H9C2 cardiomyocytes or Sprague-Dawley rats were treated with the antioxidant N-acetyl-cysteine (NAC) or the superoxide dismutase mimic tempol under the basal or nutrient deprivation conditions...
November 10, 2017: Physiological Research
https://www.readbyqxmd.com/read/29133896/the-food-borne-pathogen-campylobacter-jejuni-responds-to-the-bile-salt-deoxycholate-with-countermeasures-to-reactive-oxygen-species
#13
Nicholas M Negretti, Christopher R Gourley, Geremy Clair, Joshua N Adkins, Michael E Konkel
Bile plays an important role in digestion, absorption of fats, and the excretion of waste products, while concurrently providing a critical barrier against colonization by harmful bacteria. Previous studies have demonstrated that gut pathogens react to bile by adapting their protein synthesis. The ability of pathogens to respond to bile is remarkably complex and still incompletely understood. Here we show that Campylobacter jejuni, a leading bacterial cause of human diarrheal illness worldwide, responds to deoxycholate, a component of bile, by altering global gene transcription in a manner consistent with a strategy to mitigate exposure to reactive oxygen stress...
November 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29114945/hyperglycemia-induced-by-chronic-i-p-and-oral-glucose-loading-leads-to-hypertension-through-increased-na-retention-in-proximal-tubule
#14
Selim Fakhruddin, Wael A Alanazi, Hussain N Alhamami, Karen P Briski, Keith E Jackson
Feeding animals glucose, fructose, sucrose, and fat-enriched diets can lead to diet-induced hyperglycemia, severity of which largely depends on type and concentration of nutrients used and length of dietary intervention. As a strategy of dietary intervention, we adopted glucose-enriched diet, drinking water, and intraperitoneal (i.p.) glucose injection at the dose previously determined to be effective to establish a sustained hyperglycemia over a period of 2 weeks. In our current study, we used 4 groups of Sprague Dawley rats: control, glucose-treated, glucose+tempol, and glucose+captopril-treated groups...
November 7, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/29101507/novel-synthesized-radical-containing-nanoparticles-limit-infarct-size-following-ischemia-and-reperfusion-in-canine-hearts
#15
Hiroshi Asanuma, Shoji Sanada, Toru Yoshitomi, Hideyuki Sasaki, Hiroyuki Takahama, Madoka Ihara, Hiroko Takahama, Yoshiro Shinozaki, Hidezo Mori, Masanori Asakura, Atsushi Nakano, Masaru Sugimachi, Yoshihiro Asano, Tetsuo Minamino, Seiji Takashima, Yukio Nagasaki, Masafumi Kitakaze
PURPOSE: Although nitroxyl radicals such as 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) scavenge free radicals, their short half-life and considerable side effects such as systemic hypotension and bradycardia have limited their clinical application. Since a radical-containing nanoparticle (RNP) delivers nitroxyl radicals with a prolonged half-life specific to ischemic hearts, we investigated whether RNPs reduce infarct size without the occurrence of substantial side effects and whether nitric oxide (NO) contributes to the cardioprotective effects of RNPs...
November 3, 2017: Cardiovascular Drugs and Therapy
https://www.readbyqxmd.com/read/29070570/hypoxia-reoxygenation-enhances-murine-afferent-arteriolar-vasoconstriction-by-angiotensin-ii
#16
Tamara Margit Pahlitzsch, Zhi Zhao Liu, Amira Al-Masri, Diana Braun, Stefanie Dietze, Pontus B Persson, Wolf-Hagen Schunck, Maximilian Blum, Eckehardt Kupsch, Marion Ludwig, Andreas Patzak
We tested the hypothesis that hypoxia/reoxygenation (H/R) augments vasoreactivity to angiotensin II (Ang II). In particular, we compared an in situ live kidney slice model with isolated afferent arterioles (C57Bl6 mice) to assess the impact of tubules on microvessel response. H&E staining was used to estimate slice viability. Arterioles in the slices were located by DIC microscopy, and responses to vasoactive substances were assessed. Cytosolic calcium transients and NADPH oxidase mRNA expression were studied in isolated afferent arterioles...
October 25, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29062837/endothelinergic-contractile-hyperreactivity-in-rat-contralateral-carotid-to-balloon-injury-integrated-role-for-etb-receptors-and-superoxide-anion
#17
Larissa Pernomian, Lilian R Gimenes, Mayara S Gomes, Bruno N do Vale, Cristina R B Cardoso, Ana M de Oliveira, Josimar D Moreira
Temporal consequences of neurocompensation to balloon injury on endothelinergic functionality in rat contralateral carotid were evaluated. Rats underwent balloon injury in left carotid and were treated with CP-96345 (NK1 antagonist). Concentration-response curves for endothelin-1 were obtained in contralateral (right) carotid at 2, 8, 16, 30, or 45 days after surgery in the absence or presence of BQ-123 (ETA antagonist), BQ-788 (ETB antagonist), or Tempol (superoxide-dismutase mimic). Endothelin-1-induced calcium mobilization was evaluated in functional assays carried out with BQ-123, BQ-788, or Tempol...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29055283/reactive-oxygen-species-scavengers-ameliorate-mechanical-allodynia-in-a-rat-model-of-cancer-induced-bone-pain
#18
Ya-Qun Zhou, Dai-Qiang Liu, Shu-Ping Chen, Jia Sun, Xue-Rong Zhou, Heike Rittner, Wei Mei, Yu-Ke Tian, Hui-Xian Zhang, Fei Chen, Da-Wei Ye
Cancer-induced bone pain (CIBP) is a frequent complication in patients suffering from bone metastases. Previous studies have demonstrated a pivotal role of reactive oxygen species (ROS) in inflammatory and neuropathic pain, and ROS scavengers exhibited potent antinociceptive effect. However, the role of spinal ROS remains unclear. In this study, we investigated the analgesic effect of two ROS scavengers in a well-established CIBP model. Our results found that intraperitoneal injection of N-tert-Butyl-α-phenylnitrone (PBN, 50 and 100mg/kg) and 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl (Tempol, 100 and 200mg/kg) significantly suppressed the established mechanical allodynia in CIBP rats...
October 16, 2017: Redox Biology
https://www.readbyqxmd.com/read/29039618/sterilizing-photocurable-materials-by-irradiation-preserving-uv-curing-properties-of-photopolymers-following-e-beam-gamma-or-x-ray-exposure
#19
Jane F Emerson, Yasamin Abbaszadeh, Jonathan N Lo, Zois Tsinas, Jonas Pettersson, Pamela Ward, Mohamad I Al-Sheikhly
We have developed novel photopolymer gels to function as separators in blood collection tubes. By incorporating antioxidants such as α-tocopherol and nitroxides (TEMPO and TEMPOL), the new formulation can be sterilized with electron beam or gamma rays at a dose level of 17 kGy, without inducing premature curing of the photopolymers. For the blood separator gels that contain α-tocopherol, our results show that α-tocopherol plays a decisive role in impeding C-centered free radical propagation reactions through an H(-)transfer mechanism...
October 17, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29025747/uncoupling-protein-2-inhibits-myointimal-hyperplasia-in-preclinical-animal-models-of-vascular-injury
#20
Yan Zhang, Yaolei Zhang, Wei Li, Peijian Wang, Rui Gu, Yaxing Feng, Shujie Wei, Ke Peng, Yunrong Zhang, Linan Su, Qiang Wang, De Li, Dachun Yang, Wing Tak Wong, Yongjian Yang, Shuangtao Ma
BACKGROUND: Intracoronary stent restenosis, characterized by excessive smooth muscle cell (SMC) proliferation and myointimal hyperplasia, remains a clinical challenge. Mitochondrial membrane potential has been linked to the proliferative rate of SMCs. This study aimed to screen a critical gene regulating mitochondrial potential and to confirm its effects on myointimal formation in preclinical animal models. METHODS AND RESULTS: We performed transcriptome screening for genes differentially expressed in ligated versus unligated mouse carotid arteries...
October 12, 2017: Journal of the American Heart Association
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