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Hypoxia reoxygenation

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https://www.readbyqxmd.com/read/28915535/isoquercetin-ameliorated-hypoxia-reoxygenation-induced-h9c2-cardiomyocyte-apoptosis-via-a-mitochondrial-dependent-pathway
#1
Heng Cao, Hao Xu, Guoqing Zhu, Shaowen Liu
Isoquercetin exerts multiple pharmacological effects against various diseases. The present research sought to further investigate the role of isoquercetin in hypoxia/reoxygenation (H/R)-treated cardiomyocytes and its potential mechanism involved. The H/R model in H9C2 cells was established to mimic myocardial I/R injury in vitro. Cell proliferation and apoptosis were tested using MTT assay and Annexin V FITC-PI staining assay, respectively. We found that isoquercetin protected H9C2 cells from H/R-induced injury as the evidences that isoquercetin administration attenuated the effects of H/R treatment on H9C2 cell viability, cell apoptosis and ROS generation after H/R treatment...
September 11, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28914970/microrna-410-is-involved-in-mitophagy-after-cardiac-ischemia-reperfusion-injury-by-targeting-high-mobility-group-box-1-protein
#2
Fan Yang, Tong Li, Zhihuan Dong, Rui Mi
Mitochondrial dysfunction has emerged as a critical pathophysiological factor of myocardial ischemia/reperfusion (I/R) injury. A thorough understanding of mitochondrial dysfunction during I/R at the molecular level is urgently needed. One prominent microRNA, miR-410, was previously reported to be dynamically regulated in diverse cardiomyopathies, but its mechanism is unclear. In the present study, in a cardiac I/R injury mice model, the expression of miR-410 was significantly upregulated, accompanied with decreased mitochondrial function and mitophagy deficit...
September 15, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28904863/chimeric-zhhh-neuroglobin-acts-as-a-cell-membrane-penetrating-inducer-of-neurite-outgrowth
#3
Nozomu Takahashi, Wataru Onozuka, Seiji Watanabe, Keisuke Wakasugi
Neuroglobin (Ngb) is a heme protein expressed in the vertebrate brain. We previously engineered a chimeric Ngb protein, in which module M1 of human Ngb is replaced by that of zebrafish Ngb, and showed that the chimeric ZHHH Ngb has a cell membrane-penetrating activity similar to that of zebrafish Ngb and also rescues cells from death caused by hypoxia/reoxygenation as does human Ngb. Recently, it was reported that overexpression of mammalian Ngb in neuronal cells induces neurite outgrowth. In this study, we performed neurite outgrowth assays of chimeric Ngb using rat pheochromocytoma PC12 cells...
September 2017: FEBS Open Bio
https://www.readbyqxmd.com/read/28887166/dusp14-protects-against-hepatic-ischemia-reperfusion-injury-via-tak1-suppression
#4
Xiaozhan Wang, Wenzhe Mao, Chun Fang, Song Tian, Xueyong Zhu, Ling Yang, Zan Huang, Hongliang Li
BACKGROUND AND AIMS: Hepatic ischemia-reperfusion (I/R) injury is characterized by severe inflammation and extensive cell death. Multiple signaling pathways, including NF-κB and MAPK/Jnk, play important roles in this process. Identifying the unknown critical regulators of these signaling pathways may provide potential targets for therapeutic application. Dual specific phosphatase 14 (DUSP14) acts as a negative regulator of NF-κB signaling. However, the function of Dusp14 in hepatic I/R injury remains unknown...
September 5, 2017: Journal of Hepatology
https://www.readbyqxmd.com/read/28886525/perillyl-alcohol-protects-human-renal-tubular-epithelial-cells-from-hypoxia-reoxygenation-injury-via-inhibition-of-ros-endoplasmic-reticulum-stress-and-activation-of-pi3k-akt-enos-pathway
#5
Yixiao Xu, Wantie Wang, Keke Jin, Qifan Zhu, Hongzhou Lin, Minye Xie, Dexuan Wang
Ischemia/reperfusion (I/R) injury plays an essential role in renal transplantation, and represents a crucial risk factor for allograft dysfunction and acute renal failure. Modulation of oxidative stress is an effective therapeutic strategy for I/R injury. Perillyl alcohol (POH), a dietary monoterpene with antioxidant activity is found in a variety of plants. The study was carried out to investigate whether treatment of POH could reduce hypoxia/reoxygenation (H/R)-induced injury. H/R induced significant injury in HK-2 cells...
September 5, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28870848/sevoflurane-induced-cardioprotection-in-coronary-artery-bypass-graft-surgery-randomised-trial-with-clinical-and-ex-vivo-endpoints
#6
Sandrine Lemoine, Lan Zhu, Jean-Louis Grard, Jean-Luc Hanouz
BACKGROUND: Myocardial ischemia reperfusion injury following cardiac surgery with cardiopulmonary bypass increases postoperative mortality. Setting techniques to protect the heart during this critical period therefore represents a considerable challenge. METHOD: A randomised controlled study in Caen University Hospital Centre, investigated whether the clinical cardio protective effects of administration sevoflurane before cardiopulmonary bypass during coronary artery bypass graft surgery (CABG) could translate into protected atrial trabeculae contractility against hypoxia-reoxygenation in vitro...
September 1, 2017: Anaesthesia, Critical Care & Pain Medicine
https://www.readbyqxmd.com/read/28867579/socs2-exacerbates-myocardial-injury-induced-by-ischemia-reperfusion-in-diabetic-mice-and-h9c2-cells-through-inhibiting-the-jak-stat-igf-1-pathway
#7
Mengting Sheng, Zirui Huang, Liming Pan, Min Yu, Cai Yi, Lin Teng, Ling He, Chen Gu, Chunli Xu, Junming Li
AIMS: This study aimed to investigate potential candidates and molecular mechanisms of myocardial ischemia/reperfusion (I/R) injury (MIRI) in type 2 diabetes mellitus. MAIN METHODS: Type 2 diabetic and myocardial I/R mouse models were established with a high fat-diet (HFD) for 24weeks and subjecting to global ischemia/reperfusion for 1h/3h, respectively. Microarray analysis was applied to screen differentially expressed genes (DEGs) in the hearts of these mice. Moreover, H9c2 cells were treated with high glucose (HG) and/or hypoxia and reoxygenation (H/R)...
August 31, 2017: Life Sciences
https://www.readbyqxmd.com/read/28865453/arginine-vasopressin-altered-the-expression-of-monocarboxylate-transporters-in-cultured-astrocytes-isolated-from-stroke-prone-spontaneously-hypertensive-rats-and-congenic-shrpch1_18-rats
#8
Kazuo Yamagata, Natsumi Takahashi, Nozomi Akita, Toru Nabika
BACKGROUND: Astrocytes support a range of brain functions as well as neuronal survival, but their detailed relationship with stroke-related edema is not well understood. We previously demonstrated that the release of lactate from astrocytes isolated from stroke-prone spontaneously hypertensive rats (SHRSP/Izm) was attenuated under stroke conditions. The supply of lactate to neurons is regulated by astrocytic monocarboxylate transporters (MCTs). The purpose of this study was to examine the contributions of arginine vasopressin (AVP) and/or hypoxia and reoxygenation (H/R) to the regulation of MCTs and neurotrophic factor in astrocytes obtained from SHRSP/Izm and congenic SHRpch1_18 rats...
September 2, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28864081/hypoxic-acclimation-leads-to-metabolic-compensation-after-reoxygenation-in-atlantic-salmon-yolk-sac-alevins
#9
Elias T Polymeropoulos, Nicholas G Elliott, Peter B Frappell
Hypoxia is common in aquatic environments and has substantial effects on development, metabolism and survival of aquatic organisms. To understand the physiological effects of hypoxia and its dependence on temperature, metabolic rate (Ṁo2) and cardiorespiratory function were studied in response to acute hypoxia (21 ➔ 5kPa) at different measurement temperatures (Ta; 4, 8 and 12°C) in Salmo salar alevins that were incubated under normoxic conditions (PO2=21kPa) or following hypoxic acclimation (PO2=10kPa) as well as two different temperatures (4°C or 8°C)...
August 29, 2017: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/28857257/mir-200a-mediates-protection-of-thymosin-beta-4-in-cardiac-microvascular-endothelial-cells-as-a-novel-mechanism-under-hypoxia-reoxygenation-injury
#10
Yang Li, Xiaolong Zhu, Xiping Liu, Aolin Du, Bo Yu
Thymosin beta-4 (Tβ4) is a ubiquitous protein, which has been suggested to regulate multiple cell signal pathways and a variety of cellular functions. However, the role Tβ4 plays in the cardiac microvascular endothelial cells (CMECs) under myocardial ischemia/reperfusion injury (MIRI) is currently unknown. Here we investigated the effects of Tβ4 on hypoxia/reoxygenation (H/R) induced CMECs injury and its potential molecular mechanism. Cultured CMECs were positively identified by flow cytometry using antibody against CD31 and VWF/Factor VIII, which are constitutively expressed on the surface of CMECs...
August 31, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28851567/association-of-down-regulation-of-calcitonin-gene-related-peptide-and-substance-p-with-increase-of-myocardial-vulnerability-in-diabetic-neuropathic-rats
#11
Tu-Ping Li, Zheng Guo, Chao-Jie Liu, Tao Sun, Lu Chen, Xin Zhao
Diabetic patients present high co-morbidities of neuropathy and severer consequences of coronary heart disease. But the pathological mechanism is still unclear. Here we investigated a potential association of diabetic impairment of sensory nerves with increase of vulnerability of myocardium in acute myocardial ischemia/reperfusion. A rat model of diabetes mellitus was induced by high fat and sugar diet plus a small dose of streptozotocin. Impairment of sensory nerves was evaluated by measurement of changes in tail flick latency to noxious thermal stimulation and calcitonin gene-related peptide (CGRP) and substance P (SP) in the dorsal root ganglia (DRG) and the myocardium of the heart were examined...
August 26, 2017: Peptides
https://www.readbyqxmd.com/read/28840975/cardioprotection-mediated-by-exosomes-is-impaired-in-the-setting-of-type-ii-diabetes-but-can-be-rescued-by-the-use-of-non-diabetic-exosomes-in-vitro
#12
Sean M Davidson, Jaime A Riquelme, Kaloyan Takov, Jose M Vicencio, Claire Boi-Doku, Vanessa Khoo, Christian Doreth, Dina Radenkovic, Sergio Lavandero, Derek M Yellon
Many patients with ischaemic heart disease also have diabetes. As myocardial infarction is a major cause of mortality and morbidity in these patients, treatments that increase cell survival in response to ischaemia and reperfusion are needed. Exosomes-nano-sized, lipid vesicles released from cells-can protect the hearts of non-diabetic rats. We previously showed that exosomal HSP70 activates a cardioprotective signalling pathway in cardiomyocytes culminating in ERK1/2 and HSP27 phosphorylation. Here, we investigated whether the exosomal cardioprotective pathway remains intact in the setting of type II diabetes...
August 25, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28826365/src-3-plays-a-critical-role-in-human-umbilical-vein-endothelial-cells-by-regulating-the-pi3k-akt-mtor-pathway-in-preeclampsia
#13
Yu Yuan, Nan Shan, Bin Tan, Qinyin Deng, Yangming Liu, Hanbin Wang, Xiaofang Luo, Chengjin He, Xin Luo, Hua Zhang, Philip N Baker, David M Olson, Hongbo Qi
Preeclampsia (PE) is currently thought to be characterized by oxidative stress which may lead to endothelial dysfunction. The normal function of vascular endothelium is essential to vascular homeostasis. Previous studies have shown that steroid receptor coactivator 3 (SRC-3) interacts with estrogen receptors (ERs) which are involved in the vasoprotective effects of estrogen and is also associated with cell migration, invasion, and inflammation; however, its role in PE remains unclear. The main purpose of this study is to identify the role of SRC-3 in the function of human umbilical vein endothelial cells (HUVECs) during the development of PE...
January 1, 2017: Reproductive Sciences
https://www.readbyqxmd.com/read/28814985/activation-of-endocannabinoid-receptor-2-as-a-mechanism-of-propofol-pretreatment-induced-cardioprotection-against-ischemia-reperfusion-injury-in-rats
#14
Hai-Jing Sun, Yan Lu, Hao-Wei Wang, Hao Zhang, Shuang-Ran Wang, Wen-Yun Xu, Hai-Long Fu, Xue-Ya Yao, Feng Yang, Hong-Bin Yuan
Propofol pretreatment before reperfusion, or propofol conditioning, has been shown to be cardioprotective, while its mechanism is unclear. The current study investigated the roles of endocannabinoid signaling in propofol cardioprotection in an in vivo model of myocardial ischemia/reperfusion (I/R) injury and in in vitro primary cardiomyocyte hypoxia/reoxygenation (H/R) injury. The results showed that propofol conditioning increased both serum and cell culture media concentrations of endocannabinoids including anandamide (AEA) and 2-arachidonoylglycerol (2-AG) detected by LC-MS/MS...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28814571/microrna-15b-deteriorates-hypoxia-reoxygenation-induced-cardiomyocyte-apoptosis-by-downregulating-bcl-2-and-mapk3
#15
Yaling Liu, Liqun Yang, Jiemin Yin, Diansan Su, Zhiying Pan, Peiying Li, Xiaodong Wang
To investigate the role of miRNA-15b in cardiomyocyte apoptosis after ischemia reperfusion injury in acute myocardial infarction (AMI), we conducted the AMI rat model by using left anterior descending ligation and performed hypoxia/reoxygenation experiments in H9c2 cells. MiRNA-15b was measured by quantitative reverse transcription PCR (qRT-PCR). Cardiomyocyte apoptosis was determined by terminal deoxynucleotide transferase dUTP nick end labeling staining. Synthesized miRNA-15b mimic and inhibitor were transfected into H9c2 cells by Lipofectamine regent...
August 16, 2017: Journal of Investigative Medicine: the Official Publication of the American Federation for Clinical Research
https://www.readbyqxmd.com/read/28811138/intermittent-hypoxia-training-powerful-non-invasive-cerebroprotection-against-ethanol-withdrawal-excitotoxicity
#16
REVIEW
Marianna E Jung, Robert T Mallet
Ethanol intoxication and withdrawal exact a devastating toll on the central nervous system. Abrupt ethanol withdrawal provokes massive release of the excitatory neurotransmitter glutamate, which over-activates its postsynaptic receptors, causing intense Ca(2+) loading, p38 mitogen activated protein kinase activation and oxidative stress, culminating in ATP depletion, mitochondrial injury, amyloid β deposition and neuronal death. Collectively, these mechanisms produce neurocognitive and sensorimotor dysfunction that discourages continued abstinence...
August 12, 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/28810591/dual-character-of-flavonoids-in-attenuating-and-aggravating-ischemia-reperfusion-induced-myocardial-injury
#17
Wenqiang Li, Yun Li, Ruifang Sun, Sumei Zhou, Meifeng Li, Mingchen Feng, Yingguang Xie
The concept that flavonoids exert cardioprotection against myocardial ischemia-reperfusion (I/R) injury has been acknowledged by a large body of evidence. However, recent studies reported cardiotoxic effects of certain flavonoids, while the underlying mechanisms have remained largely elusive. Flavonoids have been demonstrated to activate aryl hydrocarbon receptor (Ahr), which is implicated in an array of cell signaling processes. The present study examined the cardioprotective roles of quercetin (Qu) and β-naphthoflavone (β-NF) against I/R injury and explored whether the underlying mechanism proceeds via molecular signaling downstream of Ahr...
August 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28809781/ac2-26-an-annexin-a1-peptide-attenuates-ischemia-reperfusion-induced-acute-lung-injury
#18
Wen-I Liao, Shu-Yu Wu, Geng-Chin Wu, Hsin-Ping Pao, Shih-En Tang, Kun-Lun Huang, Shi-Jye Chu
Annexin A1 (AnxA1) is an endogenous protein that modulates anti-inflammatory processes, and its therapeutic potential has been reported in a range of inflammatory diseases. The effect of AnxA1 on ischemia-reperfusion (IR)-induced lung injury has not been examined. In this study, isolated, perfused rat lungs were subjected to IR lung injury induced by ischemia for 40 min, followed by reperfusion for 60 min. The rat lungs were randomly treated with vehicle (phosphate-buffered saline), and Ac2-26 (an active N-terminal peptide of AnxA1) with or without an N-formyl peptide receptor (FPR) antagonist N-Boc-Phe-Leu-Phe-Leu-Phe (Boc2)...
August 15, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28806770/increasing-creatine-kinase-activity-protects-against-hypoxia-reoxygenation-injury-but-not-against-anthracycline-toxicity-in-vitro
#19
Sevasti Zervou, Hannah J Whittington, Philip J Ostrowski, Fang Cao, Jack Tyler, Hannah A Lake, Stefan Neubauer, Craig A Lygate
The creatine kinase (CK) phosphagen system is fundamental to cellular energy homeostasis. Cardiomyocytes express three CK isoforms, namely the mitochondrial sarcomeric CKMT2 and the cytoplasmic CKM and CKB. We hypothesized that augmenting CK in vitro would preserve cell viability and function and sought to determine efficacy of the various isoforms. The open reading frame of each isoform was cloned into pcDNA3.1, followed by transfection and stable selection in human embryonic kidney cells (HEK293). CKMT2- CKM- and CKB-HEK293 cells had increased protein and total CK activity compared to non-transfected cells...
2017: PloS One
https://www.readbyqxmd.com/read/28777258/knockdown-of-long-noncoding-antisense-rna-brain-derived-neurotrophic-factor-attenuates-hypoxia-reoxygenation-induced-nerve-cell-apoptosis-through-the-bdnf-trkb-pi3k-akt-signaling-pathway
#20
Jian-Bin Zhong, Xie Li, Si-Ming Zhong, Jiu-Di Liu, Chi-Bang Chen, Xiao-Yan Wu
Brain-derived neurotrophic factor (BDNF) plays an important role in neuronal cell apoptosis. The antisense RNA of brain-derived neurotrophic factor (BDNF-AS) is a natural antisense transcript that is transcribed opposite the gene that encodes BDNF. The aim of this study was to determine whether knockdown of BDNF-AS can suppress hypoxia/reoxygenation (H/R)-induced neuronal cell apoptosis and whether this is mediated by the BDNF-TrkB-PI3K/Akt pathway. We detected the expression of BDNF and BDNF-AS in brain tissue from 20 patients with cerebral infarction and five patients with other diseases (but no cerebral ischemia)...
September 27, 2017: Neuroreport
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