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https://www.readbyqxmd.com/read/28277985/indoxyl-sulfate-potentiates-endothelial-dysfunction-via-reciprocal-role-for-reactive-oxygen-species-and-rhoa-rock-signaling-in-5-6-nephrectomized-rats
#1
Shuang Chu, Xiaodong Mao, Hengjiang Guo, Li Wang, Zezheng Li, Yang Zhang, Yunman Wang, Hao Wang, Xuemei Zhang, Wen Peng
Accumulative indoxyl sulfate (IS) retained in chronic kidney disease (CKD) can potentiate vascular endothelial dysfunction, and herein, we aim at elucidating the underlying mechanisms from the perspective of possible association between reactive oxygen species (ROS) and RhoA/ROCK pathway. IS-treated nephrectomized rats are administered with antioxidants including NADPH oxidase inhibitor apocynin, SOD analog tempol, and mitochondrion-targeted SOD mimetic mito-TEMPO to scavenge ROS, or ROCK inhibitor fasudil to obstruct RhoA/ROCK pathway...
March 13, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28260074/atorvastatin-prolongs-the-lifespan-of-radiation%C3%A2-induced-reactive-oxygen-species-in-pc-3-prostate-cancer-cells-to-enhance-the-cell-killing-effect
#2
Hao Yu, Shao-Qian Sun, Xiao-Bin Gu, Wen Wang, Xian-Shu Gao
Studies have reported that atorvastatin (ATO) may increase the radiosensitivity of malignant cells. However, the influence of ATO on reactive oxygen species (ROS) levels before and after irradiation has not been fully illustrated. In the present study, radiosensitivity was evaluated by a clonogenic assay and a cell survival curve and cell apoptosis was measured by flow cytometry. ROS were detected by a laser scanning confocal microscope and flow cytometry with a DCFH-DA probe. NADPH oxidases (NOXs) and superoxide dismutase (SOD) proteins were detected by immunoblotting, and total SOD activity was measured using an SOD kit...
February 14, 2017: Oncology Reports
https://www.readbyqxmd.com/read/28212823/cyp-epoxygenase-derived-h2o2-is-involved-in-the-endothelium-derived-hyperpolarization-edh-and-relaxation-of-intrarenal-arteries
#3
Mercedes Muñoz, Maria Elvira López-Oliva, Estéfano Pinilla, María Pilar Martínez, Ana Sánchez, Claudia Rodríguez, Albino García-Sacristán, Medardo Hernández, Luis Rivera, Dolores Prieto
Reactive oxygen species (ROS) like hydrogen peroxide (H2O2) are involved in the in endothelium-derived hyperpolarization (EDH)-type relaxant responses of coronary and mesenteric arterioles. The role of ROS in kidney vascular function has mainly been investigated in the context of harmful ROS generation associated to kidney disease. The present study was sought to investigate whether H2O2 is involved in the endothelium-dependent relaxations of intrarenal arteries as well the possible endothelial sources of ROS generation involved in these responses...
February 14, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28203527/superoxide-increases-angiotensin-ii-at1-receptor-function-in-human-kidney-2-cells
#4
Mohammad Saleem, Indira Pokkunuri, Mohammad Asghar
The redox-sensitive Sp family transcription factor has been linked to the regulation of angiotensin II type 1 receptor (AT1R). However, the exact mechanism of AT1R regulation in renal cells is poorly understood. We tested the specificity of reactive oxygen species (ROS), superoxide vs. hydrogen peroxide (H2O2), and the specific role of Sp3 transcription factor, if any, in the regulation of AT1R in human kidney cells (HK2 cells). Superoxide dismutase (SOD) inhibitor diethyldithiocarbamate (DETC), but not H2O2 treatment, increased fluorescence levels of superoxide probe dihydroethidium (DHE)...
December 2016: FEBS Open Bio
https://www.readbyqxmd.com/read/28152009/superoxide-dismutase-catalase-mimetic-euk-134-prevents-diaphragm-muscle-weakness-in-monocrotalin-induced-pulmonary-hypertension
#5
Koichi Himori, Masami Abe, Daisuke Tatebayashi, Jaesik Lee, Håkan Westerblad, Johanna T Lanner, Takashi Yamada
Patients with pulmonary hypertension (PH) suffer from inspiratory insufficiency, which has been associated with intrinsic contractile dysfunction in diaphragm muscle. Here, we examined the role of redox stress in PH-induced diaphragm weakness by using the novel antioxidant, EUK-134. Male Wistar rats were randomly divided into control (CNT), CNT + EUK-134 (CNT + EUK), monocrotaline-induced PH (PH), and PH + EUK groups. PH was induced by a single intraperitoneal injection of monocrotaline (60 mg/kg body weight)...
2017: PloS One
https://www.readbyqxmd.com/read/28150935/albumin-mediated-biomineralization-of-shape-controllable-and-biocompatible-ceria-nanomaterials
#6
Zhangyou Yang, Shenglin Luo, Yiping Zeng, Chunmeng Shi, Rong Li
Although ceria-based nanostructures have emerged as fascinating materials with diverse biological activities, developing a facile, rapid, and biocompatible method of their preparation remains a major challenge. Herein we describe bovine serum albumin (BSA) protein-directed synthesis of ceria-based nanostructures, including ceria nanoclusters (CNLs), nanoparticles (CNPs), and nanochains (CNHs). Their preparation is simple, one-pot, and performed in a mild reaction condition with a "green" synthetic approach...
March 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28112896/perylene-diimide-as-a-precise-graphene-like-superoxide-dismutase-mimetic
#7
Almaz S Jalilov, Lizanne G Nilewski, Vladimir Berka, Chenhao Zhang, Andrey A Yakovenko, Gang Wu, Thomas A Kent, Ah-Lim Tsai, James M Tour
Here we show that the active portion of a graphitic nanoparticle can be mimicked by a perylene diimide (PDI) to explain the otherwise elusive biological and electrocatalytic activity of the nanoparticle construct. Development of molecular analogues that mimic the antioxidant properties of oxidized graphenes, in this case the poly(ethylene glycolated) hydrophilic carbon clusters (PEG-HCCs), will afford important insights into the highly efficient activity of PEG-HCCs and their graphitic analogues. PEGylated perylene diimides (PEGn-PDI) serve as well-defined molecular analogues of PEG-HCCs and oxidized graphenes in general, and their antioxidant and superoxide dismutase-like (SOD-like) properties were studied...
February 28, 2017: ACS Nano
https://www.readbyqxmd.com/read/27933463/effect-of-tempol-and-tempol-plus-catalase-on-intra-renal-haemodynamics-in-spontaneously-hypertensive-stroke-prone-shsp-and-wistar-rats
#8
Ahmad F Ahmeda, Mark G Rae, Mohammed F Al Otaibi, Lamyia M Anweigi, Edward J Johns
Vasoconstriction within the renal medulla contributes to the development of hypertension. This study investigated the role of reactive oxygen species (ROS) in regulating renal medullary and cortical blood perfusion (MBP and CBP respectively) in both stroke-prone spontaneously hypertensive rats (SHRSP) and Wistar rats. CBP and MBP were measured using a laser-Doppler flow meter before and after intra-renal infusion of tempol, the superoxide dismutase (SOD) mimetic or tempol plus catalase, the hydrogen peroxide-degrading enzyme...
December 9, 2016: Journal of Physiology and Biochemistry
https://www.readbyqxmd.com/read/27904046/cocl2-decreases-ec-sod-expression-through-histone-deacetylation-in-cos7-cells
#9
Shuhei Hattori, Tetsuro Kamiya, Hirokazu Hara, Masayuki Ninomiya, Mamoru Koketsu, Tetsuo Adachi
Extracellular-superoxide dismutase (EC-SOD), one of the SOD isozymes, is negatively regulated under hypoxic conditions, and decreases in its expression may exacerbate vascular diseases. Moreover, epigenetics, such as DNA methylation and histone modifications, are known to play a critical role in the progression of cancer, type 2 diabetes, and atherosclerosis. We previously investigated the involvement of reactive oxygen species (ROS) and p38 mitogen-activated protein kinase (MAPK) in decreases in EC-SOD expression in hypoxic COS7 cells; however, the role of epigenetics in this process currently remains unknown...
2016: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/27861245/selective-impairment-of-blood-pressure-reduction-by-endothelial-nitric-oxide-synthase-dimer-destabilization-in-mice
#10
Tatsiana Suvorava, Stephanie Pick, Georg Kojda
OBJECTIVES: Endothelial dysfunction and oxidative stress are associated with hypertension but whether endothelial superoxide may play a role in the early development of essential hypertension remains uncertain. We investigated whether endothelial nitric oxide synthase (eNOS)-derived endothelial oxidative stress is involved in the regulation of SBP. METHODS: Wild-type eNOS [mice with endothelium-specific overexpression of bovine endothelial NO-synthase (eNOS-Tg)] or a novel dimer-destabilized eNOS-mutant harboring a partially disrupted zinc-finger [mice with endothelium-specific overexpression of destabilized bovine eNOS destabilized by replacement of Cys 101 to Ala (C101A-eNOS-Tg)] was introduced in C57BL/6 in an endothelial-specific manner...
January 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/27788262/resveratrol-reverses-functional-chagas-heart-disease-in-mice
#11
Glaucia Vilar-Pereira, Vitor C Carneiro, Hilton Mata-Santos, Amanda R R Vicentino, Isalira P Ramos, Naira L L Giarola, Daniel F Feijó, José R Meyer-Fernandes, Heitor A Paula-Neto, Emiliano Medei, Marcelo T Bozza, Joseli Lannes-Vieira, Claudia N Paiva
Chronic chagasic cardiomyopathy (CCC) develops years after acute infection by Trypanosoma cruzi and does not improve after trypanocidal therapy, despite reduction of parasite burden. During disease, the heart undergoes oxidative stress, a potential causative factor for arrhythmias and contractile dysfunction. Here we tested whether antioxidants/ cardioprotective drugs could improve cardiac function in established Chagas heart disease. We chose a model that resembles B1-B2 stage of human CCC, treated mice with resveratrol and performed electrocardiography and echocardiography studies...
October 2016: PLoS Pathogens
https://www.readbyqxmd.com/read/27676031/phase-1b-trial-of-superoxide-so-dismutase-sod-mimetic-gc4419-to-reduce-chemoradiation-therapy-crt-induced-oral-mucositis-om-in-patients-pts-with-oral-cavity-or-oropharyngeal-carcinoma-occ
#12
C M Anderson, B G Allen, W Sun, S S Agarwala, C M Lee, M L Venigalla, L Greenberg, D Adkins, Y Chen, W Zhen, D R Mould, J Holmlund, J Brill, S T Sonis, J Buatti
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/27649046/mntbap-inhibits-bleomycin-induced-pulmonary-fibrosis-by-regulating-vegf-and-wnt-signaling
#13
Rajkumar Venkatadri, Anand Krishnan V Iyer, Vani Ramesh, Clayton Wright, Carlos A Castro, Juan S Yakisich, Neelam Azad
Cellular oxidative stress is implicated not only in lung injury but also in contributing to the development of pulmonary fibrosis. We demonstrate that a cell-permeable superoxide dismutase (SOD) mimetic and peroxynitrite scavenger, manganese (III) tetrakis (4-benzoic acid) porphyrin chloride (MnTBAP) significantly inhibited bleomycin-induced fibrogenic effects both in vitro and in vivo. Further investigation into the underlying mechanisms revealed that MnTBAP targets canonical Wnt and non-canonical Wnt/Ca2+ signaling pathways, both of which were upregulated by bleomycin treatment...
March 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/27371912/synthesis-characterization-and-pharmacological-studies-of-copper-complexes-of-flavone-derivatives-as-potential-anti-tuberculosis-agents
#14
J Joseph, K Nagashri, A Suman
Novel series of different hydroxyflavone derivatives and their copper complexes were synthesized. They were characterized using analytical and spectral techniques. The superoxide dismutase (SOD) mimetic activity of the synthesized complexes demonstrated that copper complex of L(10) has promising SOD-mimetic activity than other ligands & complexes. The in vitro antimicrobial activities of the synthesized compounds were tested against the bacterial species and fungal species. The DNA binding properties of copper complexes were studied using cyclic voltametry and electronic absorption techniques...
September 2016: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/27343087/acquired-mitochondrial-abnormalities-including-epigenetic-inhibition-of-superoxide-dismutase-2-in-pulmonary-hypertension-and-cancer-therapeutic-implications
#15
Stephen L Archer
There is no cure for non-small-cell lung cancer (NSCLC) or pulmonary arterial hypertension (PAH). Therapies lack efficacy and/or are toxic, reflecting a failure to target disease abnormalities that are distinct from processes vital to normal cells. NSCLC and PAH share reversible mitochondrial-metabolic abnormalities which may offer selective therapeutic targets. The following mutually reinforcing, mitochondrial abnormalities favor proliferation, impair apoptosis, and are relatively restricted to PAH and cancer cells: (1) Epigenetic silencing of superoxide dismutase-2 (SOD2) by methylation of CpG islands creates a pseudohypoxic redox environment that causes normoxic activation of hypoxia inducible factor (HIF-1α)...
2016: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/27325180/a-genetic-variation-of-sod2-does-not-determine-duration-of-response-to-androgen-deprivation-therapy-for-prostate-cancer
#16
Wanling Xie, Sarah Drouin, Mari Nakabayashi, Mark Pomerantz, Gwo-Shu Mary Lee, Philip W Kantoff, Nima Sharifi
BACKGROUND: Silencing SOD2 expression upregulates androgen receptor (AR) signaling and expression of SOD2 is downregulated in CRPC, compared with untreated tumors. The decreased SOD2 activity could lead to AR gain-of-function and the development of castration-resistance. METHODS: We genotyped SOD2-rs4880 in a cohort of 753 prostate cancer patients receiving androgen deprivation therapy (ADT) between 1996 and 2010. The rs4880 encodes Ala16Val in SOD2 and the Val variant has been demonstrated to be functionally less efficient than the Ala variant...
October 2016: Prostate
https://www.readbyqxmd.com/read/27303267/status-epilepticus-in-immature-rats-is-associated-with-oxidative-stress-and-mitochondrial-dysfunction
#17
Jaroslava Folbergrová, Pavel Ješina, Hana Kubová, Rastislav Druga, Jakub Otáhal
Epilepsy is a neurologic disorder, particularly frequent in infants and children where it can lead to serious consequences later in life. Oxidative stress and mitochondrial dysfunction are implicated in the pathogenesis of many neurological disorders including epilepsy in adults. However, their role in immature epileptic brain is unclear since there have been two contrary opinions: oxidative stress is age-dependent and does not occur in immature brain during status epilepticus (SE) and, on the other hand, evidence of oxidative stress in immature brain during a specific model of SE...
2016: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/27294914/protective-effect-of-ginsenoside-rg1-on-hematopoietic-stem-progenitor-cells-through-attenuating-oxidative-stress-and-the-wnt-%C3%AE-catenin-signaling-pathway-in-a-mouse-model-of-d-galactose-induced-aging
#18
Jing Li, Dachuan Cai, Xin Yao, Yanyan Zhang, Linbo Chen, Pengwei Jing, Lu Wang, Yaping Wang
Stem cell senescence is an important and current hypothesis accounting for organismal aging, especially the hematopoietic stem cell (HSC). Ginsenoside Rg1 is the main active pharmaceutical ingredient of ginseng, which is a traditional Chinese medicine. This study explored the protective effect of ginsenoside Rg1 on Sca-1⁺ hematopoietic stem/progenitor cells (HSC/HPCs) in a mouse model of d-galactose-induced aging. The mimetic aging mouse model was induced by continuous injection of d-gal for 42 days, and the C57BL/6 mice were respectively treated with ginsenoside Rg1, Vitamin E or normal saline after 7 days of d-gal injection...
June 9, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27262843/osteopontin-stimulated-apoptosis-in-cardiac-myocytes-involves-oxidative-stress-and-mitochondrial-death-pathway-role-of-a-pro-apoptotic-protein-bik
#19
Suman Dalal, Qinqin Zha, Mahipal Singh, Krishna Singh
Increased osteopontin (OPN) expression in the heart, specifically in myocytes, associates with increased myocyte apoptosis and myocardial dysfunction. Recently, we provided evidence that OPN interacts with CD44 receptor, and induces myocyte apoptosis via the involvement of endoplasmic reticulum stress and mitochondrial death pathways. Here we tested the hypothesis that OPN induces oxidative stress in myocytes and the heart via the involvement of mitochondria and NADPH oxidase-4 (NOX-4). Treatment of adult rat ventricular myocytes (ARVMs) with OPN (20 nM) increased oxidative stress as analyzed by protein carbonylation, and intracellular reactive oxygen species (ROS) levels as analyzed by ROS detection kit and dichlorohydrofluorescein diacetate staining...
July 2016: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/27256594/helium-based-cold-atmospheric-plasma-induced-reactive-oxygen-species-mediated-apoptotic-pathway-attenuated-by-platinum-nanoparticles
#20
Paras Jawaid, Mati Ur Rehman, Qing Li Zhao, Keigo Takeda, Kenji Ishikawa, Masaru Hori, Tadamichi Shimizu, Takashi Kondo
Plasma is generated by ionizing gas molecules. Helium (He)-based cold atmospheric plasma (CAP) was generated using a high-voltage power supply with low-frequency excitation (60 Hz at 7 kV) and He flow at 2 l/min. Platinum nanoparticles (Pt-NPs) are potent antioxidants due to their unique ability to scavenge superoxides and peroxides. These features make them useful for the protection against oxidative stress-associated pathologies. Here, the effects of Pt-NPs on He-CAP-induced apoptosis and the underlying mechanism were examined in human lymphoma U937 cells...
September 2016: Journal of Cellular and Molecular Medicine
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