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Hypoxia reoxygenation

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https://www.readbyqxmd.com/read/27934892/genome-maintenance-and-bioenergetics-of-the-long-lived-hypoxia-tolerant-and-cancer-resistant-blind-mole-rat-spalax-a-cross-species-analysis-of-brain-transcriptome
#1
Assaf Malik, Vered Domankevich, Han Lijuan, Fang Xiaodong, Abraham Korol, Aaron Avivi, Imad Shams
The subterranean blind mole rat, Spalax, experiences acute hypoxia-reoxygenation cycles in its natural subterranean habitat. At the cellular level, these conditions are known to promote genomic instability, which underlies both cancer and aging. However, Spalax is a long-lived animal and is resistant to both spontaneous and induced cancers. To study this apparent paradox we utilized a computational procedure that allows detecting differences in transcript abundance between Spalax and the closely related above-ground Rattus norvegicus in individuals of different ages...
December 9, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27930699/estrogen-protects-the-female-heart-from-ischemia-reperfusion-injury-through-manganese-superoxide-dismutase-phosphorylation-by-mitochondrial-p38%C3%AE-at-threonine-79-and-serine-106
#2
Tao Luo, Han Liu, Jin Kyung Kim
A collective body of evidence indicates that estrogen protects the heart from myocardial ischemia/reperfusion (I/R) injury, but the underlying mechanism remains incompletely understood. We have previously delineated a novel mechanism of how 17β-estradiol (E2) protects cultured neonatal rat cardiomyocytes from hypoxia/reoxygenation (H/R) by identifying a functionally active mitochondrial pool of p38β and E2-driven upregulation of manganese superoxide dismutase (MnSOD) activity via p38β, leading to the suppression of reactive oxygen species (ROS) and apoptosis...
2016: PloS One
https://www.readbyqxmd.com/read/27925238/danshen-enhanced-cardioprotective-effect-of-cardioplegia-on-ischemia-reperfusion-injury-in-a-human-induced-pluripotent-stem-cell-derived-cardiomyocytes-model
#3
Wei Wei, Yiwei Liu, Qiang Zhang, Yangming Wang, Xiaoling Zhang, Hao Zhang
Myocardial ischemia-reperfusion (I/R) injury is unavoidable during cardioplegic arrest and open-heart surgery. Danshen is one of the most popular traditional herbal medicines in China, which has entered the Food and Drug Administration-approved phase III clinical trial. This study was aimed to develop a human-induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) model to mimic I/R injury and evaluate the cardioprotective effect of regular cardioplegic solution with Danshen. hiPSC-CMs were cultured with the crystalloid cardioplegic solution (Thomas group) and Thomas solution with 2 or 10 µg/mL Danshen (Thomas plus Danshen groups)...
December 7, 2016: Artificial Organs
https://www.readbyqxmd.com/read/27924873/cardiac-specific-overexpression-of-mitochondrial-omi-htra2-induces-myocardial-apoptosis-and-cardiac-dysfunction
#4
Ke Wang, Yuexing Yuan, Xin Liu, Wayne Bond Lau, Lin Zuo, Xiaoliang Wang, Lu Ma, Kun Jiao, Jianyu Shang, Wen Wang, Xinliang Ma, Huirong Liu
Myocardial apoptosis is a significant problem underlying ischemic heart disease. We previously reported significantly elevated expression of cytoplasmic Omi/HtrA2, triggers cardiomyocytes apoptosis. However, whether increased Omi/HtrA2 within mitochondria itself influences myocardial survival in vivo is unknown. We aim to observe the effects of mitochondria-specific, not cytoplasmic, Omi/HtrA2 on myocardial apoptosis and cardiac function. Transgenic mice overexpressing cardiac-specific mitochondrial Omi/HtrA2 were generated and they had increased myocardial apoptosis, decreased systolic and diastolic function, and decreased left ventricular remodeling...
December 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27919821/specific-micrornas-comparisons-in-hypoxia-and-morphine-preconditioning-against-hypoxia-reoxgenation-injury-with-and-without-heart-failure
#5
Hai-Juan Zhu, Zheng-Yi Han, Shu-Fang He, Shi-Yun Jin, Shi-Jin Xu, Xiang-Dong Fang, Ye Zhang
AIMS: Ischemia reperfusion (I/R) injury is an inevitable event arising during the cardiovascular diseases development and the process of potent surgical treatments. microRNAs (miRNAs) are critical regulators of multiple cell processes including I/R injury. The present study aims to quantify miRNA alterations and regulated genes upon hypoxia-reoxygenation (H/R) injury in a rat heart failure model comparing with normal cardiomyocytes. MAIN METHODS: Chronic heart failure was established by injecting doxorubicin (2mg/kg/week) for 6weeks, then H/R was performed on primary cultured cardiomyocytes isolated from normal and failed heart...
December 2, 2016: Life Sciences
https://www.readbyqxmd.com/read/27913935/regulation-of-contractile-responses-of-vascular-smooth-muscle-cells-under-conditions-of-hypoxia-reoxygenation
#6
S V Gusakova, Yu G Birulina, L V Smagliy, I V Kovalev, I V Petrova, A V Nosarev, S N Orlov
We analyzed the effects of hypoxia and reoxygenation on changes in contractile activity in rat aortic smooth muscles. Both hypoxia and reoxygenation induced relaxation of smooth muscle cells precontracted with high-potassium Krebs solution (30 mM KCl) or α1-adrenoceptor agonist phenylephrine. Vasodilation resulted from enhancement of potassium permeability of smooth muscle cell membranes caused by activation of voltage-gated potassium channels (triggered by both precontracting agents) or by opening of ATP-sensitive potassium channels (phenylephrine)...
December 2, 2016: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/27910952/protective-effects-of-ginsenoside-rg1-on-intestinal-ischemia-reperfusion-injury-induced-oxidative-stress-and-apoptosis-via-activation-of-the-wnt-%C3%AE-catenin-pathway
#7
Guo Zu, Jing Guo, Ningwei Che, Tingting Zhou, Xiangwen Zhang
Ginsenoside Rg1 (Rg1) is one of the major bioactive ingredients in Panax ginseng, and it attenuates inflammation and apoptosis. The aims of our study were to explore the potential of Rg1 for the treatment of intestinal I/R injury and to determine whether the protective effects of Rg1 were exerted through the Wnt/β-catenin signaling pathway. In this study, Rg1 treatment ameliorated inflammatory factors, ROS and apoptosis that were induced by intestinal I/R injury. Cell viability was increased and cell apoptosis was decreased with Rg1 pretreatment following hypoxia/reoxygenation (H/R) in the in vitro study...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27904701/sirt6-suppresses-mitochondrial-defects-and-cell-death-via-the-nf-%C3%AE%C2%BAb-pathway-in-myocardial-hypoxia-reoxygenation-induced-injury
#8
Ming-Yue Cheng, You-Wei Cheng, Jun Yan, Xiao-Qin Hu, Hui Zhang, Zhi-Rong Wang, Qin Yin, Wei Cheng
The present study explored changes of the SIRT6/NF-κB pathway in myocardial hypoxia/reoxygenation induced injury and the effects on mitochondrial damage and myocardial damage by regulating SIRT6. SIRT6 expression decreased and NF-κB expression increased in H9c2 cells during hypoxic injury. Cell death and mitochondrial defects paralleled mPTP opening, and a decrease in ΔΨm occurred in hypoxic myocytes compared with normoxic control cells in annexin V and propidium iodide staining and TUNEL results. These effects were suppressed in cells overexpressing SIRT6, but reemerged in cells expressing the SIRT6 mutant...
2016: American Journal of Translational Research
https://www.readbyqxmd.com/read/27899859/effect-of-n-perfluorooctane-on-hypoxia-reoxygenation-injury-in-human-umbilical-vein-endothelial-cells
#9
Jing Jiang, Deng-Yong Chen, Zhi-Tao Liu, Feng Chen, Jing-Jing Zhang, Jing Cui, Jien Pang
BACKGROUND: This study investigated the effect of n-perfluorooctane (PFC) on hypoxia/reoxygenation (H/R) injury in human umbilical vein endothelial cells (HUVECs). METHODS: In this study, the H/R models were prepared by chemical methods (using dithionite solution). The experimental groups included the control group, the PFC group with a culture volume ratio of 10%, the H/R model group, and treatment groups with various doses of PFC + H/R (i.e., 5%, 10%, or 20% PFC by volume)...
November 2016: Acta Cardiologica Sinica
https://www.readbyqxmd.com/read/27895979/optical-redox-ratio-identifies-metastatic-potential-dependent-changes-in-breast-cancer-cell-metabolism
#10
Kinan Alhallak, Lisa G Rebello, Timothy J Muldoon, Kyle P Quinn, Narasimhan Rajaram
The development of prognostic indicators of breast cancer metastatic risk could reduce the number of patients receiving chemotherapy for tumors with low metastatic potential. Recent evidence points to a critical role for cell metabolism in driving breast cancer metastasis. Endogenous fluorescence intensity of nicotinamide adenine dinucleotide (NADH) and flavin adenine dinucleotide (FAD) can provide a label-free method for assessing cell metabolism. We report the optical redox ratio of FAD/(FAD + NADH) of four isogenic triple-negative breast cancer cell lines with varying metastatic potential...
November 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/27894079/microrna-214-protects-against-hypoxia-reoxygenation-induced-cell-damage-and-myocardial-ischemia-reperfusion-injury-via-suppression-of-pten-and-bim1-expression
#11
Xiaohui Wang, Tuanzhu Ha, Yuanping Hu, Chen Lu, Li Liu, Xia Zhang, Race Kao, John Kalbfleisch, David Williams, Chuanfu Li
BACKGROUND: Myocardial apoptosis plays an important role in myocardial ischemia/reperfusion (I/R) injury. Activation of PI3K/Akt signaling protects the myocardium from I/R injury. This study investigated the role of miR-214 in hypoxia/reoxygenation (H/R)-induced cell damage in vitro and myocardial I/R injury in vivo. METHODS AND RESULTS: H9C2 cardiomyoblasts were transfected with lentivirus expressing miR-214 (LmiR-214) or lentivirus expressing scrambled miR-control (LmiR-control) respectively, to establish cell lines of LmiR-214 and LmiR-control...
November 22, 2016: Oncotarget
https://www.readbyqxmd.com/read/27893995/combined-effects-of-cadmium-temperature-and-hypoxia-reoxygenation-on-mitochondrial-function-in-rainbow-trout-oncorhynchus-mykiss
#12
John O Onukwufor, Don Stevens, Collins Kamunde
Although aquatic organisms face multiple environmental stressors that may interact to alter adverse outcomes, our knowledge of stressor-stressor interaction on cellular function is limited. We investigated the combined effects of cadmium (Cd), hypoxia-reoxygenation (H-R) and temperature on mitochondrial function. Liver mitochondria from juvenile rainbow trout were exposed to Cd (0-20μM) and H-R (0 and 5min) at 5, 13 and 25°C followed by measurements of mitochondrial Cd load, volume, complex І active (A)↔deactive (D) transition, membrane potential, ROS release and ultrastructural changes...
November 18, 2016: Aquatic Toxicology
https://www.readbyqxmd.com/read/27888631/autophagy-decreases-alveolar-macrophage-apoptosis-by-attenuating-endoplasmic-reticulum-stress-and-oxidative-stress
#13
Tao Fan, Lei Chen, Zhixin Huang, Zhangfan Mao, Wei Wang, Boyou Zhang, Yao Xu, Shize Pan, Hao Hu, Qing Geng
To study the impact of autophagy on alveolar macrophage apoptosis and its mechanism in the early stages of hypoxia, we established a cell hypoxia-reoxygenation model and orthotopic left lung ischemia-reperfusion model. Rat alveolar macrophages stably expressing RFP-LC3 were treated with autophagy inhibitor (3-methyladenine, 3-MA) or autophagy promoter (rapamycin), followed by hypoxia-reoxygenation treatment 2 h, 4 h or 6 h later. Twenty Sprague-Dawley male rats were randomly divided into four different groups: no blocking of left lung hilum (model group), left lung hilum blocked for 1h with DMSO lavage (control group), left lung hilum blocked for 1 h with 100 ml/kg 3-MA (5 μmol/L) lavage (3-MA group), and left lung hilum blocked for 1 h with 100 ml/kg rapamycin (250 nmol/L) lavage (rapamycin group)...
November 24, 2016: Oncotarget
https://www.readbyqxmd.com/read/27888018/1400w-ameliorates-acute-hypobaric-hypoxia-reoxygenation-induced-cognitive-deficits-by-suppressing-the-induction-of-inducible-nitric-oxide-synthase-in-rat-cerebral-cortex-microglia
#14
Qinghai Shi, Xin Liu, Ning Wang, Xinchuan Zheng, Jihua Ran, Zhengxiang Liu, Jianfeng Fu, Jiang Zheng
Nitric oxide (NO) is involved in neuronal modifications, and overproduction of NO contributes to memory deficits after acute hypobaric hypoxia-reoxygenation. This study investigated the ability of the iNOS inhibitor 1400W to counteract spatial memory deficits following acute hypobaric hypoxia-reoxygenation, and to affect expression of NOS, NO, 3-NT and MDA production, and apoptosis in rat cerebral cortex. We also used primary rat microglia to investigate the effect of 1400W on expression of NOS, NO, 3-NT and MDA production, and apoptosis...
November 22, 2016: Behavioural Brain Research
https://www.readbyqxmd.com/read/27887883/nanoprecipitated-catestatin-released-from-pharmacologically-active-microcarriers-pams-exerts-pro-survival-effects-on-msc
#15
C Angotti, M C Venier-Julienne, C Penna, S Femminò, L Sindji, C Paniagua, C N Montero-Menei, P Pagliaro
Catestatin (CST), a fragment of Chromogranin-A, exerts angiogenic, arteriogenic, vasculogenic and cardioprotective effects. CST is a very promising agent for revascularization purposes, in "NO-OPTION" patients. However, peptides have a very short half-life after administration and must be conveniently protected. Fibronectin-coated pharmacologically active microcarriers (FN-PAM), are biodegradable and biocompatible polymeric microspheres that can convey mesenchymal stem cell (MSCs) and therapeutic proteins delivered in a prolonged manner...
November 22, 2016: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/27886191/hemodynamic-and-metabolic-effects-of-a-new-pediatric-dobutamine-formulation-in-hypoxic-newborn-pigs
#16
Victoria E Mielgo, Adolf Valls-I-Soler, Juan M Lopez de Heredia, Heike Rabe, Carmen Rey-Santano
BACKGROUND: The aim of our study was to measure drug-related changes in hemodynamics and oxygen metabolism in response to different doses of an age-appropriate dobutamine formulation in hypoxic pigs. A secondary aim was to validate superior vena cava flow (SVCF) as a marker of cardiac index (CI) for subsequent clinical trials of this formulation in humans. METHODS: Newborn pigs (n=18) were exposed to 2h-hypoxia (10-15% oxygen) followed by reoxygenation (21-30% oxygen 4h)...
November 25, 2016: Pediatric Research
https://www.readbyqxmd.com/read/27882354/bcl-2-associated-athanogene-3-protects-the-heart-from-ischemia-reperfusion-injury
#17
Feifei Su, Valerie D Myers, Tijana Knezevic, JuFang Wang, Erhe Gao, Muniswamy Madesh, Farzaneh G Tahrir, Manish K Gupta, Jennifer Gordon, Joseph Rabinowitz, Frederick V Ramsey, Douglas G Tilley, Kamel Khalili, Joseph Y Cheung, Arthur M Feldman
Bcl-2-associated athanogene 3 (BAG3) is an evolutionarily conserved protein expressed at high levels in the heart and the vasculature and in many cancers. While altered BAG3 expression has been associated with cardiac dysfunction, its role in ischemia/reperfusion (I/R) is unknown. To test the hypothesis that BAG3 protects the heart from reperfusion injury, in vivo cardiac function was measured in hearts infected with either recombinant adeno-associated virus serotype 9-expressing (rAAV9-expressing) BAG3 or GFP and subjected to I/R...
November 17, 2016: JCI Insight
https://www.readbyqxmd.com/read/27875543/irisin-ameliorates-hypoxia-reoxygenation-induced-injury-through-modulation-of-histone-deacetylase-4
#18
Yu Tina Zhao, Hao Wang, Shouyan Zhang, Jianfeng Du, Shougang Zhuang, Ting C Zhao
Irisin is a recently identified myokine which brings increases in energy expenditure and contributes to the beneficial effects of exercise through the browning of white adipose tissues. However, its effects in the heart remains unknown. This study sought to determine the effects of irisin on hypoxia/reoxygenation injury and its relationship with HDAC4. Wild type and stable HDAC4-overexpression cells were generated from H9c2 cardiomyoblasts. HDAC4 overexpression cells and wild type H9c2 cells were exposed to 24 hours of hypoxia followed by one hour of reoxygenation in vitro in the presence or absence of irisin (5 ng/ml)...
2016: PloS One
https://www.readbyqxmd.com/read/27869201/cardioprotection-by-combination-of-three-compounds-from-shengmai-preparations-in-mice-with-myocardial-ischemia-reperfusion-injury-through-ampk-activation-mediated-mitochondrial-fission
#19
Fang Li, Xiaoxue Fan, Yu Zhang, Lizhi Pang, Xiaonan Ma, Meijia Song, Junping Kou, Boyang Yu
GRS is a drug combination of three active components including ginsenoside Rb1, ruscogenin and schisandrin. It derived from the well-known TCM formula ShengMai preparations, a widely used traditional Chinese medicine for the treatment of cardiovascular diseases in clinic. The present study explores the cardioprotective effects of GRS on myocardial ischemia/reperfusion (MI/R) injury compared with ShengMai preparations and investigates the underlying mechanisms. GRS treatment significantly attenuated MI/R injury and exhibited similar efficacy as Shengmai preparations, as evidenced by decreased myocardium infarct size, ameliorated histological features, the decrease of LDH production and improved cardiac function, and also produced a significant decrease of apoptotic index...
November 21, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27867451/thioredoxin-interacting-protein-mediates-nlrp3-inflammasome-activation-involved-in-the-susceptibility-to-ischemic-acute-kidney-injury-in-diabetes
#20
Ye Da Xiao, Ya Yi Huang, Hua Xin Wang, Yang Wu, Yan Leng, Min Liu, Qian Sun, Zhong-Yuan Xia
Kidney in diabetic state is more sensitive to ischemic acute kidney injury (AKI). However, the underlying mechanisms remain unclear. Herein, we examined the impact of diabetes mellitus on thioredoxin-interacting protein (TXNIP) expression and whether mediated NLRP3 activation was associated with renal ischemia/reperfusion- (I/R-) induced AKI. In an in vivo model, streptozotocin-induced diabetic rats showed higher susceptibility to I/R injury with increased TXNIP expression, which was significantly attenuated by resveratrol (RES) treatment (10 mg/kg intraperitoneal daily injection for 7 consecutive days prior to I/R induction)...
2016: Oxidative Medicine and Cellular Longevity
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