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https://www.readbyqxmd.com/read/29667811/in-vitro-and-in-vivo-studies-of-the-electrophilicity-of-physcion-and-its-oxidative-metabolites
#1
Xiaotong Qin, Ying Peng, Jiang Zheng
Physcion (1,8-dihydroxy-3-methoxy-6-methyl-9,10-anthracenedione) is a bioactive component found in Polygoni Multiflori Radix (PMR) which has been widely used as traditional Chinese medicine. Unfortunately, studies showed hepatotoxicity of PMR during its clinical use. The mechanisms of its toxic action remain unknown. The major objectives of this study were to characterize oxidative metabolites of physcion in vitro and in vivo and to determine the electrophilicity of the parent compound and its oxidative metabolites...
April 18, 2018: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/29666281/pathogenic-effects-of-ifit2-and-interferon-%C3%AE-during-fatal-systemic-candida-albicans-infection
#2
Marcin Stawowczyk, Shamoon Naseem, Valeria Montoya, Darren P Baker, James Konopka, Nancy C Reich
A balanced immune response to infection is essential to prevent the pathology and tissue damage that can occur from an unregulated or hyperactive host defense. Interferons (IFNs) are critical mediators of the innate defense to infection, and in this study we evaluated the contribution of a specific gene coding for IFIT2 induced by type I IFNs in a murine model of disseminated Candida albicans Invasive candidiasis is a frequent challenge during immunosuppression or surgical medical interventions, and C. albicans is a common culprit that leads to high rates of mortality...
April 17, 2018: MBio
https://www.readbyqxmd.com/read/29665408/neuroprotective-effect-of-angiotensin-1-7-against-rotenone-induced-oxidative-damage-in-cath-a-neurons
#3
Yong Zhou, Min Li, Dong-Lin Zhu, Teng Jiang, Qing Gao, Xiao-Hong Tang, Shu-Gang Zhang, Jie Lu, Ying-Dong Zhang
There is evidence to support that ROSs are increased in Parkinson's disease (PD). Our recent research showed that angiotensin II (Ang II) participated in the pathogenesis of PD by triggering oxidative stress. Angiotensin-(1-7)[Ang-(1-7)] has been shown to moderate the adverse effects of the Ang II in many diseases. The purpose of the present study was to determine whether the Ang-(1-7) could have similar effects in CATH.a neurons. We used rotenone-induced neuron injury models to evaluate changes in cultured CATH...
April 14, 2018: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/29664709/non-clinical-efficacy-and-safety-studies-on-g1xcgd-a-lentiviral-vector-for-ex-vivo-gene-therapy-of-x-linked-chronic-granulomatous-disease
#4
Christian Brendel, Michael Rothe, Giorgia Santilli, Sabine Charrier, Stefan Stein, Hana Kunkel, Daniela Abriss, Uta Müller-Kuller, Bobby Gaspar, Ute Modlich, Anne Galy, Axel Schambach, Adrian J Thrasher, Manuel Grez
Chronic granulomatous disease (CGD) is a debilitating primary immunodeficiency affecting phagocyte function due to the absence of nicotinamide dinucleotide phosphate (NADPH) oxidase activity. The vast majority of CGD patients in the Western world have mutations within the X-linked CYBB gene encoding for gp91phox (NOX2), the redox center of the NADPH oxidase complex (XCGD). Current treatments of XCGD are not entirely satisfactory, and prior attempts at autologous gene therapy using gammaretrovirus vectors did not provide long-term curative effects...
April 17, 2018: Human Gene Therapy. Clinical Development
https://www.readbyqxmd.com/read/29664131/anti-fibrotic-actions-of-ghrelin-by-inhibition-of-the-nadph-oxidase-ros-signaling-pathway
#5
Qian Wang, Xin Sui, Rui Chen, Peiyong Ma, Tao Ding, Dianjun Sui, Ping Yang
This study aims to investigate whether the molecular mechanisms by which Ghrelin inhibits cardiac fibrosis are linked to the NADPH oxidase-ROS signaling pathway. Adult male Sprague Dawley (SD) rats were randomly divided into 4 groups: sham, myocardial infarction (MI), MI + Ghrelin (100 μg/kg, twice daily, subcutaneous for 4 weeks beginning 24 h post-MI), or Ghrelin alone. Adult rat cardiac fibroblasts (CFs) were isolated and pretreated with or without Ghrelin for 24 h, followed by stimulation with or without angiotensin II (Ang II) for another 24 h...
April 17, 2018: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/29663332/enhanced-isobutanol-production-from-acetate-by-combinatorial-overexpression-of-acetyl-coa-synthetase-and-anaplerotic-enzymes-in-engineered-escherichia-coli
#6
Hun-Suk Song, Hyung-Min Seo, Jong-Min Jeon, Yu-Mi Moon, Ju Won Hong, Yoon Gi Hong, Shashi Kant Bhatia, Jungoh Ahn, Hongweon Lee, Wooseong Kim, Yong-Cheol Park, Kwon Young Choi, Yun-Gon Kim, Yung-Hun Yang
Acetic acid is an abundant material that can be used as a carbon source by microorganisms. Despite its abundance, its toxicity and low energy content make it hard to utilize as a sole carbon source for biochemical production. To increase acetate utilization and isobutanol production with engineered Escherichia coli, the feasibility of utilizing acetate and metabolic engineering was investigated. The expression of acs, pckA, and maeB increased isobutanol production by up to 26%, and the addition of TCA cycle intermediates indicated that the intermediates can enhance isobutanol production...
April 17, 2018: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/29661712/nadph-oxidase-2-nox2-a-key-target-of-oxidative-stress-mediated-platelet-activation-and-thrombosis
#7
REVIEW
Eduardo Fuentes, Jonathan M Gibbins, Lisa M Holbrook, Iván Palomo
Oxidative stress represents an imbalance between the production of reactive oxygen species (ROS) and the cellular antioxidant system. Increased levels of oxidative stress contribute to the development of atherosclerosis that eventually leads to thrombosis; a principle cause of heart attacks and strokes. Thrombosis is a consequence of platelet activation and aggregate formation within the circulation. Platelet ROS are mostly generated by reduced nicotinamide adenine dinucleotide phosphate (NADPH) oxidase. NOX2 is an isoform from NADPH oxidase expressed in platelets and an important regulator of platelet activation-associated thrombosis...
March 26, 2018: Trends in Cardiovascular Medicine
https://www.readbyqxmd.com/read/29660796/mechanistic-and-structural-insights-into-the-in-vitro-inhibitory-action-of-hypericin-on-glutathione-reductase-purified-from-baker-s-yeast
#8
Ozlem Dalmizrak, Kerem Teralı, Redwan Kawa Abdullah, Nazmi Ozer
This work aims at studying the interaction between glutathione reductase (GR) and hypericin. The type of inhibition was determined by measuring changes in GR activity at increasing concentrations of hypericin as well as at varying concentrations of glutathione disulfide (GSSG) and nicotinamide adenine dinucleotide phosphate (NADPH), and the binding pose of hypericin was predicted by molecular docking. Accordingly, hypericin emerges as an effective inhibitor of GR. When the variable substrate is GSSG, the type of inhibition is competitive...
April 16, 2018: Journal of Biochemical and Molecular Toxicology
https://www.readbyqxmd.com/read/29660504/idh2-deficiency-accelerates-skin-pigmentation-in-mice-via-enhancing-melanogenesis
#9
Jung Hyun Park, Hyeong Jun Ku, Jin Hyup Lee, Jeen-Woo Park
Melanogenesis is a complex biosynthetic pathway regulated by multiple agents, which are involved in the production, transport, and release of melanin. Melanin has diverse roles, including determination of visible skin color and photoprotection. Studies indicate that melanin synthesis is tightly linked to the interaction between melanocytes and keratinocytes. α-melanocyte-stimulating hormone (α-MSH) is known as a trigger that enhances melanin biosynthesis in melanocytes through paracrine effects. Accumulated reactive oxygen species (ROS) in skin affects both keratinocytes and melanocytes by causing DNA damage, which eventually leads to the stimulation of α-MSH production...
April 6, 2018: Redox Biology
https://www.readbyqxmd.com/read/29660403/ros-modifiers-and-nox4-affect-the-expression-of-the-survivin-associated-radio-adaptive-response
#10
Jeffrey S Murley, Jack L Arbiser, Ralph R Weichselbaum, David J Grdina
The survivin-associated radio-adaptive response can be induced following exposure to ionizing radiation in the dose range from 5 to 100 mGy, and its magnitude of expression is dependent upon the TP53 mutational status of cells and ROS signaling. The purpose of the study was to investigate the potential role of ROS in the development of the survivin-associated adaptive response. Utilizing human colon carcinoma HCT116 TP53 wild type (WT) and HCT116 isogenic TP53 null mutant (Mut) cell cultures, the roles of inter- and intracellular ROS signaling on expression of the adaptive response as evidenced by changes in intracellular translocation of survivin measured by ELISA, and cell survival determined by a standard colony forming assay were investigated using ROS modifying agents that include emodin, N-acetyl-l-cysteine (NAC), fulvene-5, honokiol, metformin and rotenone...
April 13, 2018: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/29660332/dusp14-knockout-accelerates-cardiac-ischemia-reperfusion-ir-injury-through-activating-nf-%C3%AE%C2%BAb-and-mapks-signaling-pathways-modulated-by-ros-generation
#11
Bin Lin, Jing Xu, De-Guang Feng, Feng Wang, Jia-Xiang Wang, Hui Zhao
Inflammation and oxidative stress are significantly involved in the progression of a variety of diseases, including myocardial ischemia/reperfusion (IR). In the present study, we hypothesized a protective role of dual-specificity phosphatase 14 (DUSP14) in myocardial IR, as well as the underlying molecular mechanism. The results indicated that DUSP14 was down-regulated following cardiac IR injury. Subsequently, the wild type (WT) and DUSP14-knockout (KO) mice were included to further reveal the potential role of DUSP14 in cardiac IR injury progression...
April 13, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29660240/ros-signaling-and-stomatal-movement-in-plant-responses-to-drought-stress-and-pathogen-attack
#12
REVIEW
Junsheng Qi, Chun-Peng Song, Baoshan Wang, Jianmin Zhou, Jaakko Kangasjärvi, Jian-Kang Zhu, Zhizhong Gong
Stomata, the pores formed by a pair of guard cells, are the main gateways for water transpiration and photosynthetic CO2 exchange, as well as pathogen invasion in land plants. Guard cell movement is regulated by a combination of environmental factors including water status, light, CO2 levels and pathogen attack, as well as endogenous signals such as abscisic acid and apoplastic reactive oxygen species (ROS). Under abiotic and biotic stress conditions, extracellular ROS are mainly produced by plasma membrane-localized NADPH oxidases, whereas intracellular ROS are produced in multiple organelles...
April 16, 2018: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/29659985/grapevine-fatty-acid-hydroperoxide-lyase-generates-actin-disrupting-volatiles-and-promotes-defence-related-cell-death
#13
Sahar Akaberi, Hao Wang, Patricia Claudel, Michael Riemann, Bettina Hause, Philippe Hugueney, Peter Nick
Fatty acid hydroperoxides can generate short-chained volatile aldehydes that may participate in plant defence. A grapevine Hydroperoxide lyase (VvHPL1) clustering to the CYP74B class was functionally characterised with respect to a role in defence. In grapevine leaves, transcripts of this gene accumulated rapidly to high abundance in response to wounding. Cellular functions of VvHPL1 were investigated upon heterologous expression in tobacco BY-2 cells. A C-terminal GFP fusion of VvHPL1 was located in plastids...
April 5, 2018: Journal of Experimental Botany
https://www.readbyqxmd.com/read/29659123/advanced-oxidation-protein-products-induce-pre-osteoblast-apoptosis-through-a-nicotinamide-adenine-dinucleotide-phosphate-oxidase-dependent-mitogen-activated-protein-kinases-mediated-intrinsic-apoptosis-pathway
#14
Si-Yuan Zhu, Jing-Shen Zhuang, Qian Wu, Zhong-Yuan Liu, Cong-Rui Liao, Shi-Gan Luo, Jian-Ting Chen, Zhao-Ming Zhong
Osteoblast apoptosis contributes to age-related bone loss. Advanced oxidation protein products (AOPPs) are recognized as the markers of oxidative stress and potent inducers of apoptosis. We have demonstrated that AOPP accumulation was correlated with age-related bone loss. However, the effect of AOPPs on the osteoblast apoptosis still remains unknown. Exposure of osteoblastic MC3T3-E1 cells to AOPPs caused the excessive generation of reactive oxygen species (ROS) by activating nicotinamide adenine dinucleotide phosphate (NADPH) oxidases...
April 16, 2018: Aging Cell
https://www.readbyqxmd.com/read/29658146/uva-metabolism-and-melanoma-uva-makes-melanoma-hungry-for-metastasis
#15
REVIEW
York Kamenisch, Irina Ivanova, Konstantin Drexler, Mark Berneburg
Ultraviolet (UV) radiation has a plethora of effects on human tissues. In the UV spectrum, wavelengths above 320nm fall into the UVA-range and for these it has been shown that they induce reactive oxygen species (ROS), DNA mutations and are capable to induce melanoma in mice. In addition to this it was recently shown that UVA irradiation and UVA-induced ROS also increase glucose metabolism of melanoma cells. UVA irradiation causes a persistent increase in glucose consumption, accompanied by increased glycolysis, increased lactic acid production and activation of the pentose phosphate pathway...
April 15, 2018: Experimental Dermatology
https://www.readbyqxmd.com/read/29656218/improved-hypocrellin-a-production-in-shiraia-bambusicola-by-light-dark-shift
#16
Chun Xiao Sun, Yan Jun Ma, Jian Wen Wang
Hypocrellin A (HA) is a major bioactive perylenequinone from the fruiting body of Shiraia bambusicola used for the treatment of skin diseases and developed as a photodynamic therapy (PDT) agent against cancers and viruses. The mycelial culture of S. bambusicola under dark is a biotechnological alternative for HA production but with low yield. In this study, light and dark conditions were investigated to develop effective elicitation on HA production in the cultures. Our results showed the constant light at 200 lx stimulated HA production without any growth retardation of mycelia...
April 9, 2018: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29655790/hdac11-deletion-reduces-fructose-induced-cardiac-dyslipidemia-apoptosis-and-inflammation-by-attenuating-oxidative-stress-injury
#17
Xiao-Di Fan, Lan-Lan Wan, Man Duan, Shan Lu
Diabetes mellitus (DM) is a risk factor for abnormal heart development, but the molecular mechanism remains obscure. Histone deacetylase 11 (HDAC11), the most recently identified histone deacetylase, is the sole member of class IV HDACs. However, its role in diabetic cardiac injury is still poorly understood. In the present study, we attempted to explore the effects of HDAC11 on fructose (Fru)-induced cardiac injury using the wild type (HDAC11+/+ ) and knockout (HDAC11-/- ) mice. The results indicated that HDAC11 was significantly expressed in human and mouse diabetic heart failure (DHF) hearts...
April 12, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29655699/scutellarin-protects-against-vascular-endothelial-dysfunction-and-prevents-atherosclerosis-via-antioxidation
#18
Jiao Mo, Renhua Yang, Fan Li, Xiaochao Zhang, Bo He, Yue Zhang, Peng Chen, Zhiqiang Shen
BACKGROUND: Scutellarin is the major constituent responsible for the clinical benefits of Erigeron breviscapus (Vant.) Hand.-Mazz which finds a long history of ethnopharmacological use in Traditional Chinese Medicine. Scutellarin as a pure compound is now under investigation for its protections against various tissue injuries. PURPOSE: This study aims to examine the effects of scutellarin on oxidative stress-induced vascular endothelial dysfunction and endothelial cell damage, and then to evaluate the therapeutic efficacy of scutellarin in preventing atherosclerosis in rats...
March 15, 2018: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/29653363/trapidil-improves-hemodynamic-echocardiographic-and-redox-state-parameters-of-right-ventricle-in-monocrotaline-induced-pulmonary-arterial-hypertension-model
#19
Patrick Türck, Denise Santos Lacerda, Cristina Campos Carraro, Bruna Gazzi de Lima-Seolin, Rayane Brinck Teixeira, Jéssica Hellen Poletto Bonetto, Rafael Colombo, Paulo Cavalheiro Schenkel, Adriane Belló-Klein, Alex Sander da Rosa Araujo
BACKGROUND: Pulmonary arterial hypertension is a disease characterized by increased pulmonary vascular resistance and redox imbalance, leading to failure of right ventricle. Trapidil has been described to improve the redox balance and cardiac conditions. HYPOTHESIS: Trapidil can improve the redox balance and contribute to functional improvements of the RV in PAH. METHODS AND RESULTS: Male, 5week-old Wistar rats were divided into four groups: Control, Control + Trapidil, Monocrotaline and Monocrotaline + Trapidil...
April 10, 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29653276/in-vivo-microscopy-in-neurosurgical-oncology
#20
REVIEW
Hany Osman, Joseph Georges, Deena Elsahy, Eyas Hattab, Steven Yocom, Aaron A Cohen-Gadol
Intraoperative neurosurgical histopathologic diagnoses rely on evaluation of rapid tissue preparations such as frozen sections and smears with conventional light microscopy. Though useful, these techniques are time consuming and therefore unable to provide real-time intraoperative feedback. In vivo molecular imaging techniques are emerging as novel methods for generating real-time diagnostic histopathologic images of tumors and their surrounding tissues. These imaging techniques rely on contrast generated by exogenous fluorescent dyes, autofluorescence of endogenous molecules, fluorescence decay of excited molecules, or light scattering...
April 10, 2018: World Neurosurgery
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