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ischemia and endoplasmic reticulum

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https://www.readbyqxmd.com/read/28087437/hydrogen-rich-saline-attenuates-hippocampus-endoplasmic-reticulum-stress-after-cardiac-arrest-in-rats
#1
Yu Gao, Qinfang Gui, Li Jin, Pan Yu, Lin Wu, Liangbin Cao, Qiang Wang, Manlin Duan
BACKGROUND: Hydrogen-rich saline can selectively scavenge reactive oxygen species (ROS) and protect brain against ischemia reperfusion (I/R) injury. Endoplasmic reticulum stress (ERS) has been implicated in the pathological process of cerebral ischemia. However, very little is known about the role of hydrogen-rich saline in mediating pathophysiological reactions to ERS after I/R injury caused by cardiac arrest. METHODS: The rats were randomly divided into three groups, sham group (n=30), ischemia/reperfusion group (n=40) and hydrogen-rich saline group (n=40)...
January 10, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28087295/postconditioning-induced-neuroprotection-mechanisms-and-applications-in-cerebral-ischemia
#2
REVIEW
Yan-Ying Fan, Wei-Wei Hu, Fang Nan, Zhong Chen
Ischemic postconditioning (PostC) is defined as a series of rapid intermittent interruptions of blood flow at the phase of reperfusion, which produces neuroprotection against cerebral ischemia/reperfusion injury via mobilizing the brain's own endogenous adaptive mechanisms. Now the concept of conventional ischemic PostC has been extended to limb remote ischemic PostC and chemical PostC with hypoxia, volatile anesthetic, CO2, etc. According to the different temporal profile of PostC, it is divided into rapid and delayed PostC...
January 10, 2017: Neurochemistry International
https://www.readbyqxmd.com/read/28042553/remote-ischemic-preconditioning-enhances-the-expression-of-genes-encoding-antioxidant-enzymes-and-endoplasmic-reticulum-stress-related-proteins-in-rat-skeletal-muscle
#3
Ui Jun Park, Hyoung Tae Kim, Won Hyun Cho, Jae Hyoung Park, Hye Ra Jung, Min Young Kim
PURPOSE: Ischemic preconditioning (IPC), including remote IPC (rIPC) and direct IPC (dIPC), is a promising method to decrease ischemia-reperfusion (IR) injury. This study tested the effect of both rIPC and dIPC on the genes for antioxidant enzymes and endoplasmic reticulum (ER) stress-related proteins. MATERIALS AND METHODS: Twenty rats were randomly divided into the control and study groups. In the control group (n=10), the right hind limb was sham-operated. The left hind limb (IscR) of the control group underwent IR injury without IPC...
December 2016: Vascular Specialist International
https://www.readbyqxmd.com/read/28036323/chemical-chaperone-4-phenylbutyric-acid-reduces-cardiac-ischemia-reperfusion-injury-by-alleviating-endoplasmic-reticulum-stress-and-oxidative-stress
#4
Lian Jian, Yuan Lu, Shan Lu, Chengzhi Lu
BACKGROUND Cardiovascular diseases are the leading cause of death in many countries and myocardial ischemia-reperfusion (I/R) injury is the cause of many serious heart diseases. Recent reports suggested that endoplasmic reticulum (ER) stress is associated with the progress of ischemia/reperfusion (I/R) injury. In a previous study, we illustrated that 4-phenylbutyric acid (4-PBA) reduces I/R-induced cell death in vitro through inhibiting the ER stress-initiated cell apoptosis. In the present study we investigated whether 4-PBA improves heart function in isolated rat hearts subjected to I/R and elucidated the potential mechanisms involved in 4-PBA-induced cardioprotective effects...
December 30, 2016: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28004805/tauroursodeoxycholic-acid-reduces-er-stress-by-regulating-of-akt-dependent-cellular-prion-protein
#5
Yeo Min Yoon, Jun Hee Lee, Seung Pil Yun, Yong-Seok Han, Chul Won Yun, Hyun Jik Lee, Hyunjin Noh, Sei-Jung Lee, Ho Jae Han, Sang Hun Lee
Although mesenchymal stem cells (MSCs) are a promising cell source for regenerative medicine, ischemia-induced endoplasmic reticulum (ER) stress induces low MSC engraftment and limits their therapeutic efficacy. To overcome this, we investigated the protective effect of tauroursodeoxycholic acid (TUDCA), a bile acid, on ER stress in MSCs in vitro and in vivo. In ER stress conditions, TUDCA treatment of MSCs reduced the activation of ER stress-associated proteins, including GRP78, PERK, eIF2α, ATF4, IRE1α, JNK, p38, and CHOP...
December 22, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27993557/inhibition-of-endoplasmic-reticulum-stress-by-neuregulin-1-protects-against-myocardial-ischemia-reperfusion-injury
#6
Shan-Juan Fang, Peng-Yang Li, Chun-Mei Wang, Yi Xin, Wei-Wei Lu, Xiao-Xia Zhang, Song Zuo, Chang-Sheng Ma, Chao-Shu Tang, Shao-Ping Nie, Yong-Fen Qi
Neuregulin-1 (NRG-1), an endogenously produced polypeptide, is the ligand of cardiomyocyte ErbB receptors, with cardiovascular protective effects. In the present study, we explored whether the cardioprotective effect of NRG-1 against I/R injury is mediated by inhibiting myocardial endoplasmic reticulum (ER) stress. In vitro, NRG-1 directly inhibited the upregulation of ER stress markers such as glucose-regulated protein 78, CCAAT/enhancer binding protein homologous protein and cleaved caspase-12 induced by the ER stress inducers tunicamycin or dithiothreitol in both neonatal and adult ventricular myocytes...
December 16, 2016: Peptides
https://www.readbyqxmd.com/read/27987381/hypoxia-ischemia-activate-processing-of-amyloid-precursor-protein-impact-of-vascular-dysfunction-in-the-pathogenesis-of-alzheimer-s-disease
#7
REVIEW
Antero Salminen, Anu Kauppinen, Kai Kaarniranta
Alzheimer's disease (AD) is associated with deficiencies in cerebrovascular functions, e.g. reduced cerebral blood flow and capillary amyloid angiopathy, both of which are evident during the early phase of AD, thus local hypoxia/ischemia could augment the pathogenesis of AD. There is abundant literature revealing that exposures to hypoxia/ischemia increase the amyloidogenic processing of amyloid-β precursor protein (APP) leading to the accumulation of amyloid-β peptides in brain. This hypoxia-induced response has been attributed to a significant increase in the activities of β- and γ-secretases, whereas α-secretase activity decreases in hypoxia...
December 17, 2016: Journal of Neurochemistry
https://www.readbyqxmd.com/read/27939990/apomorphine-prevents-lps-induced-il-23-p19-mrna-expression-via-inhibition-of-jnk-and-atf4-in-hapi-cells
#8
Hirokazu Hara, Dai Kimoto, Miho Kajita, Chisato Takada, Tetsuro Kamiya, Tetsuo Adachi
Inflammation has been reported to be closely related to exaggeration of cerebral ischemia and neurodegenerative diseases. Microglia, resident immune cells in the central nervous system, can be activated in response to neuronal injury and produce proinflammatory cytokines, resulting in further aggravation of neuronal injury. Interleukin (IL)-23, which consists of p19 and IL-12 p40 subunits, has been shown to be involved in brain injury associated with neuroinflammation. Apomorphine (Apo), a nonselective dopamine receptor agonist, has been used for clinical therapy of Parkinson's disease...
December 9, 2016: European Journal of Pharmacology
https://www.readbyqxmd.com/read/27910195/mulberrofuran-g-protects-ischemic-injury-induced-cell-death-via-inhibition-of-nox4-mediated-ros-generation-and-er-stress
#9
Sungeun Hong, Jaeyoung Kwon, Dong-Woo Kim, Hak Ju Lee, Dongho Lee, Woongchon Mar
The aim of this study was to investigate the neuroprotective effect of mulberrofuran G (MG) in in vitro and in vivo models of cerebral ischemia. MG was isolated from the root bark of Morus bombycis. MG inhibited nicotinamide adenine dinucleotide phosphate oxidase (NOX) enzyme activity and oxygen-glucose deprivation/reoxygenation (OGD/R)-induced NOX4 protein expression in SH-SY5Y cells. MG inhibited the expression of activated caspase-3 and caspase-9 and cleaved poly adenine dinucleotide phosphate-ribose polymerase in OGD/R-induced SH-SY5Y cells...
December 2, 2016: Phytotherapy Research: PTR
https://www.readbyqxmd.com/read/27904664/tauroursodeoxycholic-acid-inhibits-endoplasmic-reticulum-stress-blocks-mitochondrial-permeability-transition-pore-opening-and-suppresses-reperfusion-injury-through-gsk-3%C3%A3-in-cardiac-h9c2-cells
#10
Yuxi Xie, Yonggui He, Zhiliang Cai, Jianhang Cai, Mengyao Xi, Yidong Zhang, Jinkun Xi
This study investigates whether inhibition of endoplasmic reticulum (ER) stress prevents opening of the mitochondrial permeability transition pore (mPTP) and evaluates the corresponding signaling pathways involved in this process. Exposure of cardiac H9c2 cells to 800 µM H2O2 for 20 min opened mPTP in response to oxidative stress, as demonstrated by quenching of tetramethylrhodamine ethyl ester (TMRE) fluorescence. Oxidative stress-induced mPTP opening was rescued by the ER stress inhibitor tauroursodeoxycholic acid (TUDCA) in a dose-dependent manner at low concentrations...
2016: American Journal of Translational Research
https://www.readbyqxmd.com/read/27888631/autophagy-decreases-alveolar-macrophage-apoptosis-by-attenuating-endoplasmic-reticulum-stress-and-oxidative-stress
#11
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/27862079/discarded-livers-find-a-new-life-engineered-liver-grafts-using-hepatocytes-recovered-from-marginal-livers
#12
Basak E Uygun, Maria-Louisa Izamis, Maria Jaramillo, Yibin Chen, Gavrielle Price, Sinan Ozer, Martin L Yarmush
Treatment for end-stage liver failure is restricted by the critical shortage of donor organs; about 4000 people die in the USA while waiting for a transplantable organ. This situation has been a major driving force behind the rise of tissue engineering to build artificial tissues/organs. Recent advancements in creating transplantable liver grafts using decellularized liver scaffolds bring the field closer to clinical translation. However, a source of readily available and highly functional adult hepatocytes in adequate numbers for regenerative liver therapies still remains unclear...
November 8, 2016: Artificial Organs
https://www.readbyqxmd.com/read/27854125/apelin-apj-system-a-novel-therapeutic-target-for-myocardial-ischemia-reperfusion-injury
#13
Zhe Chen, Di Wu, Lanfang Li, Linxi Chen
Apelin is the endogenous ligand of the G protein-coupled receptor, APJ. Recently, researches indicate that the apelin/APJ system involves in myocardial ischemia-reperfusion injury (MIRI), which is a common pathophysiological process in patients with heart diseases and therapies. The reperfusion induces the expression of apelin and APJ receptor, which play an important role in cardioprotection of MIRI. The apelin/APJ system alleviates MIRI mainly by decreasing mitochondrial reactive oxygen species and delaying the opening of mitochondrial permeability transition pores, which induce the initiation of mitophagy...
December 2016: DNA and Cell Biology
https://www.readbyqxmd.com/read/27824068/sulforaphane-improves-ischemia-induced-detrusor-overactivity-by-downregulating-the-enhancement-of-associated-endoplasmic-reticulum-stress-autophagy-and-apoptosis-in-rat-bladder
#14
Huai-Ching Tai, Shiu-Dong Chung, Chiang-Ting Chien, Hong-Jeng Yu
Atherosclerosis-associated pelvic ischemia has been reported to be a risk factor for bladder dysfunction and subsequent lower urinary tract symptoms (LUTS) in the elderly population. However, the molecular mechanisms of this association remain unclear. We hypothesized that stress-induced cellular responses might play a role in the pathogenesis of ischemia-induced bladder dysfunction. In the present study, the animal model of bladder ischemia was induced by bilateral partial arterial occlusion (BPAO) in rats...
November 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27795806/c1q-tnf-related-protein-9-protects-diabetic-rat-heart-against-ischemia-reperfusion-injury-role-of-endoplasmic-reticulum-stress
#15
Sanxing Bai, Liang Cheng, Yang Yang, Chongxi Fan, Dajun Zhao, Zhigang Qin, Xiao Feng, Lin Zhao, Jipeng Ma, Xiaowu Wang, Jian Yang, Xuezeng Xu, Dinghua Yi, Wei Yi
As a newly identified adiponectin paralog, C1q/TNF-related protein 9 (CTRP9) reduces myocardial ischemia reperfusion (IR) injury through partially understood mechanisms. In the present study, we sought to identify the role of endoplasmic reticulum stress (ERS) in CTRP9 induced cardioprotection in diabetic heart. Isolated hearts from high-fat-diet (HFD) induced type 2 diabetic Sprague-Dawley rats were subjected to ex vivo IR protocol via a Langendorff apparatus at the presence of globular CTRP9. CTRP9 significantly improved post-IR heart function and reduced cardiac infarction, cardiomyocytes apoptosis, Caspase-3, Caspase-9, Caspase-12, TNF-α expression, and lactate dehydrogenase activity...
2016: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/27794481/activated-protein-c-prevents-methylglyoxal-induced-endoplasmic-reticulum-stress-and-cardiomyocyte-apoptosis-via-regulation-of-the-amp-activated-protein-kinase-signaling-pathway
#16
Dae-Hwan Nam, Jung-Hwa Han, Suji Kim, YoungHyun Shin, Jae Hyang Lim, Hyoung Chul Choi, Chang-Hoon Woo
Previous epidemiological studies have shown that methylglyoxal (MGO) levels are highly regulated in diabetic cardiovascular diseases. We have also previously reported that MGO mediates ER stress and apoptosis in cardiomyocytes. Furthermore, activated protein C (APC) has recently been shown to play a protective role against ER stress, as well as a cardioprotective role against ischemia and reperfusion injury by augmenting the AMP-activated protein kinase (AMPK) signaling pathway. Therefore, we hypothesized that APC protects against MGO-induced cardiomyocyte apoptosis through the inhibition of ER stress...
October 26, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27785700/naringenin-ameliorates-hypoxia-reoxygenation-induced-endoplasmic-reticulum-stress-mediated-apoptosis-in-h9c2-myocardial-cells-involvement-in-atf6-ire1%C3%AE-and-perk-signaling-activation
#17
Jia-You Tang, Ping Jin, Qing He, Lin-He Lu, Ji-Peng Ma, Wei-Lun Gao, He-Ping Bai, Jian Yang
Naringenin, a flavanone mainly derived from grapes and citrus fruits, has been reported to exhibit cardioprotective effects. Accumulating evidence has confirmed that endoplasmic reticulum (ER) stress-mediated apoptosis participates in the process of myocardial ischemia/reperfusion injury and inhibiting ER stress is a potential therapeutic target/strategy in preventing cardiovascular diseases. Herein, the current study was designed to investigate whether naringenin protects H9c2 myocardial cells against hypoxia/reoxygenation (H/R) injury via attenuating ER stress or ER stress-mediated apoptosis...
January 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/27771898/trehalose-inhibits-protein-aggregation-caused-by-transient-ischemic-insults-through-preservation-of-proteasome-activity-not-via-induction-of-autophagy
#18
Ye Li, Yinan Luo, Tianfei Luo, Bin Lu, Chen Wang, Yanhong Zhang, Meihua Piao, Chunsheng Feng, Pengfei Ge
Protein aggregation has been proved to be a pathological basis accounting for neuronal death caused by either transient global ischemia or oxygen glucose deprivation (OGD), and inhibition of protein aggregation is emerging as a potential strategy of preventing brain damage. Trehalose was found to inhibit protein aggregation caused by neurodegenerative diseases via induction of autophagy, whereas its effect is still elusive on ischemia-induced protein aggregation. In this study, we investigated this issue by using rat model of transient global ischemia and SH-SY5Y model of OGD...
October 22, 2016: Molecular Neurobiology
https://www.readbyqxmd.com/read/27763637/nogo-c-regulates-cardiomyocyte-apoptosis-during-mouse-myocardial-infarction
#19
Shi Jia, Xue Qiao, Jingjing Ye, Xuan Fang, Chunling Xu, Yangpo Cao, Ming Zheng
Myocardial infarction is caused by insufficient coronary blood supply, which leads to myocardial damage and eventually the heart failure. Molecular mechanisms associated with the loss of cardiomyocytes during myocardial infarction (MI) and ischemia-related cardiac diseases are not yet fully understood. Nogo-C is an endoplasmic reticulum protein ubiquitously expressed in tissues including in the heart, however, the cardiac function of Nogo-C is still unknown. In the present study, we found that Nogo-C was upregulated in mouse hearts after MI, and hypoxic treatments also increased Nogo-C protein level in cardiomyocytes...
October 20, 2016: Cell Death & Disease
https://www.readbyqxmd.com/read/27733676/unfolded-protein-response-in-brain-ischemia-a-timely-update
#20
REVIEW
Wei Yang, Wulf Paschen
Folding and processing newly synthesized proteins are vital functions of the endoplasmic reticulum that are sensitive to a variety of stress conditions. The unfolded protein response is activated to restore endoplasmic reticulum function impaired by stress. While we know that brain ischemia impairs endoplasmic reticulum function, the role of unfolded protein response activation in post-ischemic recovery of neurologic function is only beginning to emerge. Here, we summarize what is known about endoplasmic reticulum stress and unfolded protein response in brain ischemia and discuss recent findings from myocardial ischemia studies that could help to advance research on endoplasmic reticulum stress and unfolded protein response in brain ischemia...
December 2016: Journal of Cerebral Blood Flow and Metabolism
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