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hypoxia ischemic stress

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https://www.readbyqxmd.com/read/29768254/neuroprotection-against-hypoxic-ischemic-injury-%C3%AE-opioid-receptors-and-bdnf-trkb-pathway
#1
Shiying Sheng, Jingzhong Huang, Yi Ren, Feng Zhi, Xuansong Tian, Guoqiang Wen, Guanghong Ding, Terry C Xia, Fei Hua, Ying Xia
The delta-opioid receptor (DOR) is one of three classic opioid receptors in the opioid system. It was traditionally thought to be primarily involved in modulating the transmission of messages along pain signaling pathway. Although there were scattered studies on its other neural functions, inconsistent results and contradicting conclusions were found in past literatures, especially in terms of DOR's role in a hypoxic/ischemic brain. Taking inspiration from the finding that the turtle brain exhibits a higher DOR density and greater tolerance to hypoxic/ischemic insult than the mammalian brain, we clarified DOR's specific role in the brain against hypoxic/ischemic injury and reconciled previous controversies in this aspect...
May 11, 2018: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29765498/edaravone-improves-septic-cardiac-function-by-inducing-an-hif-1-%C3%AE-ho-1-pathway
#2
Chao He, Wei Zhang, Suobei Li, Wei Ruan, Junmei Xu, Feng Xiao
Septic myocardial dysfunction remains prevalent and raises mortality rate in patients with sepsis. During sepsis, tissues undergo tremendous oxidative stress which contributes critically to organ dysfunction. Edaravone, a potent radical scavenger, has been proved beneficial in ischemic injuries involving hypoxia-inducible factor- (HIF-) 1, a key regulator of a prominent antioxidative protein heme oxygenase- (HO-) 1. However, its effect in septic myocardial dysfunction remains unclarified. We hypothesized that edaravone may prevent septic myocardial dysfunction by inducing the HIF-1/HO-1 pathway...
2018: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/29748581/leptin-increases-mitochondrial-opa1-via-gsk3-mediated-oma1-ubiquitination-to-enhance-therapeutic-effects-of-mesenchymal-stem-cell-transplantation
#3
Fan Yang, Rongrong Wu, Zhi Jiang, Jinghai Chen, Jinliang Nan, Sheng'an Su, Na Zhang, Chen Wang, Jing Zhao, Cheng Ni, Yingchao Wang, Wangxing Hu, Zhiru Zeng, Keyang Zhu, Xianbao Liu, Xinyang Hu, Wei Zhu, Hong Yu, Jinyu Huang, Jian'an Wang
Accumulating evidence revealed that mesenchymal stem cells (MSCs) confer cardioprotection against myocardial infarction (MI). However, the poor survival and engraftment rate of the transplanted cells limited their therapeutic efficacy in the heart. The enhanced leptin production associated with hypoxia preconditioning contributed to the improved MSCs survival. Mitochondrial integrity determines the cellular fate. Thus, we aimed to investigate whether leptin can enhance mitochondrial integrity of human MSCs (hMSCs) to protect against various stress...
May 10, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29733848/polyacetylene-glycoside-attenuates-ischemic-kidney-injury-by-co-inhibiting-inflammation-mitochondria-dysfunction-and-lipotoxicity
#4
Yijie Zhou, Dan Du, Shuyun Liu, Meng Zhao, Yujia Yuan, Lan Li, Younan Chen, Yanrong Lu, Jingqiu Cheng, Jingping Liu
AIMS: Ischemic acute kidney injury (AKI) is a serious clinical problem and no efficient therapeutics is available in clinic now. Natural polyacetylene glycosides (PGAs) had shown antioxidant and anti-inflammatory properties, but their effects on kidney injury have not been evaluated. This study aimed to investigate the protective effect of PGA on ischemic kidney injury in renal tubular epithelial cells (TECs) and mice. MAIN METHODS: Hypoxic HK-2 cells and renal ischemia/reperfusion injury (IRI) mice were treated with PGA from Coreopsis tinctoria, and the cell viability, renal function, apoptosis, inflammation, mitochondrial injury, lipids metabolism were analyzed...
May 4, 2018: Life Sciences
https://www.readbyqxmd.com/read/29725368/ccaat-enhancer-binding-protein-homologous-protein-knockdown-alleviates-hypoxia-induced-myocardial-injury-in-rat-cardiomyocytes-exposed-to-high-glucose
#5
Wenqi Yang, Fang Wu, Ting Luo, Yuelan Zhang
Diabetic patients are more sensitive to ischemic injury than non-diabetics. Endoplasmic reticulum (ER) stress has been reported to be closely associated with the pathophysiology of ischemic injury in diabetes. The aim of the present study was to investigate the mechanisms involved in the progression of diabetes complicated by myocardial infarction (MI) and further verify the role of CCAAT/enhancer binding protein (C/EBP)-homologous protein (CHOP) using an in vitro model of diabetes/MI. The rats were exposed to 65 mg/kg streptozotocin (STZ) and left anterior descending (LAD) coronary artery ligation...
May 2018: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29723859/upregulation-of-nox2-and-nox4-mediated-by-tgf-%C3%AE-signaling-pathway-exacerbates-cerebral-ischemia-reperfusion-oxidative-stress-injury
#6
Zheng Lou, Ai-Ping Wang, Xiao-Ming Duan, Guo-Huang Hu, Gui-Lin Song, Mei-Ling Zuo, Zhong-Bao Yang
BACKGROUND/AIMS: Ischemic stroke is still one of the leading debilitating diseases with high morbidity and mortality. NADPH oxidase (NOX)-derived reactive oxygen species (ROS) play an important role in cerebral ischemia/reperfusion (I/R) injury. However, the mechanism underlying the regulation of ROS generation is still not fully elucidated. This study aims to explore the role of transforming growth beta (TGF-β) signals in ROS generation. METHODS: Sprague-Dawley rats were subjected to I/R injury, and PC-12 cells were challenged by hypoxia/reoxygenation (H/R) and/or treated with activin receptor-like kinase (ALK5) inhibitor Sb505124 or siRNA against ALK5...
2018: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29704622/hypothermia-augments-stress-response-in-mammalian-cells
#7
Kattri-Liis Eskla, Rando Porosk, Riin Reimets, Tanel Visnapuu, Eero Vasar, Christian Ansgar Hundahl, Hendrik Luuk
Mild hypothermia (32°C) is routinely used in medical practice to alleviate hypoxic ischemic damage, however, the mechanisms that underlie its protective effects remain uncertain. Using a systems approach based on genome-wide expression screens, reporter assays and biochemical studies, we find that cellular hypothermia response is associated with the augmentation of major stress-inducible transcription factors Nrf2 and HIF1Α affecting the antioxidant system and hypoxia response pathways, respectively. At the same time, NF-κB, a transcription factor involved in the control of immune and inflammatory responses, was not induced by hypothermia...
April 25, 2018: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/29689567/ampk-contributes-to-cardioprotective-effects-of-pterostilbene-against-myocardial-ischemia-reperfusion-injury-in-diabetic-rats-by-suppressing-cardiac-oxidative-stress-and-apoptosis
#8
Ramoji Kosuru, Yin Cai, Vidya Kandula, Dan Yan, Chunyan Wang, Hong Zheng, Yalan Li, Michael G Irwin, Sanjay Singh, Zhengyuan Xia
BACKGROUND/AIMS: Pterostilbene (PT) exerts antidiabetic effects by decreasing blood glucose and modulating lipid metabolism and has been shown to attenuate myocardial ischemia-reperfusion (IR) injury in non-diabetic subjects. However, whether PT can protect against myocardial IR injury in diabetes is unknown. AMPK stimulation is indispensable in offering cardioprotection against myocardial IR injury in diabetes by limiting cardiac apoptosis. Thus, we hypothesized that PT may confer protection against myocardial IR injury in diabetes via AMPK activation...
April 18, 2018: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29687347/%C3%AE-opioid-receptor-activation-attenuates-hypoxia-mpp-induced-downregulation-of-pink1-a-novel-mechanism-of-neuroprotection-against-parkinsonian-injury
#9
Yuan Xu, Feng Zhi, Ya Peng, Naiyuan Shao, Dhiaedin Khiati, Gianfranco Balboni, Yilin Yang, Ying Xia
There is emerging evidence suggesting that neurotoxic insults and hypoxic/ischemic injury are underlying causes of Parkinson's disease (PD). Since PTEN-induced kinase 1 (PINK1) dysfunction is involved in the molecular genesis of PD and since our recent studies have demonstrated that the δ-opioid receptor (DOR) induced neuroprotection against hypoxic and 1-methyl-4-phenyl-pyridimium (MPP+ ) insults, we sought to explore whether DOR protects neuronal cells from hypoxic and/or MPP+ injury via the regulation of PINK1-related pathways...
April 24, 2018: Molecular Neurobiology
https://www.readbyqxmd.com/read/29684674/natural-products-targeting-er-stress-pathway-for-the-treatment-of-cardiovascular-diseases
#10
REVIEW
Ker Woon Choy, Dharmani Murugan, Mohd Rais Mustafa
Endoplasmic reticulum (ER) is the main organelle for the synthesis, folding, and processing of secretory and transmembrane proteins. Pathological stimuli including hypoxia, ischaemia, inflammation and oxidative stress interrupt the homeostatic function of ER, leading to accumulation of unfolded proteins, a condition referred to as ER stress. ER stress triggers a complex signalling network referred as the unfolded protein response (UPR). Extensive studies have demonstrated that ER stress plays an important role in the pathogenesis of various cardiovascular diseases such as heart failure, ischemic heart disease and atherosclerosis...
April 21, 2018: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/29652048/-should-a-doctor-take-into-consideration-the-influence-of-climatic-factors-deliberations-on-the-occasion-of-the-publication-of-a-new-monograph-the-book-of-essays-of-arid-medicine-by-z-r-zununov-i-h-nurov-and-s-z-zununova
#11
E L Povazhnaya
The authors analyze the monograph of the Uzbek scientists professor Z.R. Zununov, I.H. Nurov, and S.Z. Zununova «Essays of arid medicine» (Tashkent: «KAMALAK-PRESS» publishing house, 2016;540). The book presents the results of the comprehensive bioclimatic assessment of the arid zones of Uzbekistan, their extreme climatic conditions (such as high intensity and solar radiation and the considerable duration of its period, dry air and summer heat, sandstorms (the so-called «Afghans»), and the great variety of the natural health-improving factors including mineral waters, microclimate of the speleotherapeutic cave, the desert dune sand, etc...
April 9, 2018: Voprosy Kurortologii, Fizioterapii, i Lechebnoĭ Fizicheskoĭ Kultury
https://www.readbyqxmd.com/read/29643458/pro-inflammatory-cytokines-activate-hypoxia-inducible-factor-3%C3%AE-via-epigenetic-changes-in-mesenchymal-stromal-stem-cells
#12
Francesca Cuomo, Antonietta Coppola, Chiara Botti, Ciro Maione, Amalia Forte, Lucia Scisciola, Giuseppina Liguori, Ilaria Caiafa, Matilde Valeria Ursini, Umberto Galderisi, Marilena Cipollaro, Lucia Altucci, Gilda Cobellis
Human mesenchymal stromal/stem cells (hMSCs) emerged as a promising therapeutic tool for ischemic disorders, due to their ability to regenerate damaged tissues, promote angiogenesis and reduce inflammation, leading to encouraging, but still limited results. The outcomes in clinical trials exploring hMSC therapy are influenced by low cell retention and survival in affected tissues, partially influenced by lesion's microenvironment, where low oxygen conditions (i.e. hypoxia) and inflammation coexist. Hypoxia and inflammation are pathophysiological stresses, sharing common activators, such as hypoxia-inducible factors (HIFs) and NF-κB...
April 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29621765/nrf2-activation-induced-by-sirt1-ameliorates-acute-lung-injury-after-intestinal-ischemia-reperfusion-through-nox4-mediated-gene-regulation
#13
DongDong Chai, Lei Zhang, SiWei Xi, YanYong Cheng, Hong Jiang, Rong Hu
BACKGROUND/AIMS: Nuclear erythroid 2-related factor-2 (Nrf2) is a major stress-response transcription factor that has been implicated in regulating ischemic angiogenesis. We investigated the effects of Nrf2 in regulating revascularization and modulating acute lung injury. METHODS: The expression of Nrf2 and sirtuin1 (Sirt1) was assessed in lung tissue by western blotting and immunofluorescence staining after intestinal ischemia/reperfusion (IIR) in Nrf2-/- and wild-type (WT) mice...
March 29, 2018: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29574014/notch-signaling-and-neuronal-death-in-stroke
#14
REVIEW
Thiruma V Arumugam, Sang-Ha Baik, Priyanka Balaganapathy, Christopher G Sobey, Mark P Mattson, Dong-Gyu Jo
Ischemic stroke is a leading cause of morbidity and death, with the outcome largely determined by the amount of hypoxia-related neuronal death in the affected brain regions. Cerebral ischemia and hypoxia activate the Notch1 signaling pathway and four prominent interacting pathways (NF-κB, p53, HIF-1α and Pin1) that converge on a conserved DNA-associated nuclear multi-protein complex, which controls the expression of genes that can determine the fate of neurons. When neurons experience a moderate level of ischemic insult, the nuclear multi-protein complex up-regulates adaptive stress response genes encoding proteins that promote neuronal survival, but when ischemia is more severe the nuclear multi-protein complex induces genes encoding proteins that trigger and execute a neuronal death program...
March 21, 2018: Progress in Neurobiology
https://www.readbyqxmd.com/read/29562588/pretreatment-with-group-ii-metabotropic-glutamate-receptor-agonist-ly379268-protects-neonatal-rat-brains-from-oxidative-stress-in-an-experimental-model-of-birth-asphyxia
#15
Ewelina Bratek, Apolonia Ziembowicz, Elzbieta Salinska
Hypoxia-ischemia (H-I) at the time of birth may cause neonatal death or lead to persistent brain damage. The search for an effective treatment of asphyxiated infants has not resulted in an effective therapy, and hypothermia remains the only available therapeutic strategy. Among possible experimental therapies, the induction of ischemic tolerance is promising. Recent investigations have shown that activation of group II metabotropic glutamate receptors (mGluR2/3) can provide neuroprotection against H-I, but the mechanism of this effect is not clear...
March 17, 2018: Brain Sciences
https://www.readbyqxmd.com/read/29561203/n-acetylcysteine-rapidly-replenishes-central-nervous-system-glutathione-measured-via-magnetic-resonance-spectroscopy-in-human-neonates-with-hypoxic-ischemic-encephalopathy
#16
Hunter G Moss, Truman R Brown, Donald B Wiest, Dorothea D Jenkins
Persistent oxidative stress depletes reduced glutathione (GSH), an intracellular antioxidant and an important determinant of CNS injury after hypoxia ischemia. We used standard, short echo time Stimulated Echo Acquisition Mode (STEAM) to detect GSH by magnetic resonance spectroscopy (MRS) in 24 term neonates with hypoxic-ischemic encephalopathy (HIE), on day of life 5-6, after rewarming from therapeutic hypothermia. MRS demonstrated reliable, consistent GSH of 1·64 ± 0·20 mM in the basal ganglia immediately before intravenous infusion of N-acetylcysteine...
January 1, 2018: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/29550818/klotho-reduces-necroptosis-by-targeting-oxidative-stress-involved-in-renal-ischemic-reperfusion-injury
#17
Yingying Qian, Xiangjiang Guo, Lin Che, Xuejing Guan, Bei Wu, Renhua Lu, Mingli Zhu, Huihua Pang, Yucheng Yan, Zhaohui Ni, Leyi Gu
BACKGROUND/AIMS: Klotho is a multifunctional protein expressed predominantly in kidney tubular epithelium. Here, we investigated the protective effects of Klotho on necroptosis in renal ischemic-reperfusion injury (IRI) and the role of oxidative stress in this process. METHODS: Mice were subjected to bilateral renal pedicle clamping. Mouse renal tubular epithelial (TCMK-1) cells were exposed to hypoxia/reoxygenation (H/R) or H2O2. Kidney samples from acute kidney injury (AKI) patients and controls were examined by immunofluorescence...
March 10, 2018: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29526538/activation-of-ampk-inhibits-inflammatory-response-during-hypoxia-and-reoxygenation-through-modulating-jnk-mediated-nf-%C3%AE%C2%BAb-pathway
#18
Xu Chen, Xuan Li, Wenyan Zhang, Jie He, Bo Xu, Bin Lei, Zhenhua Wang, Courtney Cates, Thomas Rousselle, Ji Li
BACKGROUND: AMP-activated Protein Kinase (AMPK) is a stress-activated kinase that protects against cardiomyocyte injury during ischemia and reperfusion. c-Jun N-terminal kinase (JNK), a mitogen activated protein kinase, is activated by ischemia and reperfusion. NF-κB is an important transcription factor involved in ischemia and reperfusion injury. METHODS AND RESULTS: The intrinsic activation of AMPK attenuates the inflammation which occurred during ischemia/reperfusion through the modulation of the JNK mediated NF-κB signaling pathway...
June 2018: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/29497356/role-of-mtorc1-controlling-proteostasis-after-brain-ischemia
#19
REVIEW
Maria J Perez-Alvarez, Mario Villa Gonzalez, Irene Benito-Cuesta, Francisco G Wandosell
Intense efforts are being undertaken to understand the pathophysiological mechanisms triggered after brain ischemia and to develop effective pharmacological treatments. However, the underlying molecular mechanisms are complex and not completely understood. One of the main problems is the fact that the ischemic damage is time-dependent and ranges from negligible to massive, involving different cell types such as neurons, astrocytes, microglia, endothelial cells, and some blood-derived cells (neutrophils, lymphocytes, etc...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29477947/cardioprotective-effect-of-n-methylnicotinamide-salt-of-pyruvate-in-experimental-model-of-cardiac-hypoxia
#20
Magdalena A Zabielska, Jan Adamus, Robert Kowalski, Jerzy Gebicki, Ewa M Slominska, Zain Khalpey, Ryszard T Smolenski
BACKGROUND: Pyruvate improves contractility of normal, hypoxic, and post-ischemic myocardium. However, sodium overload is a major problem with its therapeutic application if sodium pyruvate is used. Development of alternative forms such as N-1-methylnicotinamide (MNA) pyruvate may help to overcome this problem. The aim of the study was to investigate the effect of MNA pyruvate in a murine model of cardiac ischemia. METHODS: Seven month old male ApoE-/- LDLr-/- mice that develop myocardial infarction when exposed to hypoxic stress, were used in this study...
April 2018: Pharmacological Reports: PR
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