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ischemic reperfusion

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https://www.readbyqxmd.com/read/28107026/impact-of-mobile-intensive-care-unit-use-on-total-ischemic-time-and-clinical-outcomes-in-st-elevation-myocardial-infarction-patients-real-world-data-from-the-acute-coronary-syndrome-israeli-survey
#1
Edward Koifman, Roy Beigel, Zaza Iakobishvili, Nir Shlomo, Yitschak Biton, Avi Sabbag, Elad Asher, Shaul Atar, Shmuel Gottlieb, Ronny Alcalai, Doron Zahger, Amit Segev, Ilan Goldenberg, Rafael Strugo, Shlomi Matetzky
BACKGROUND: Ischemic time has prognostic importance in ST-elevation myocardial infarction patients. Mobile intensive care unit use can reduce components of total ischemic time by appropriate triage of ST-elevation myocardial infarction patients. METHODS: Data from the Acute Coronary Survey in Israel registry 2000-2010 were analyzed to evaluate factors associated with mobile intensive care unit use and its impact on total ischemic time and patient outcomes. RESULTS: The study comprised 5474 ST-elevation myocardial infarction patients enrolled in the Acute Coronary Survey in Israel registry, of whom 46% ( n=2538) arrived via mobile intensive care units...
January 1, 2017: European Heart Journal. Acute Cardiovascular Care
https://www.readbyqxmd.com/read/28104457/genetic-deletion-of-soluble-epoxide-hydrolase-provides-cardioprotective-responses-following-myocardial-infarction-in-aged-mice
#2
REVIEW
K Lockhart Jamieson, Victor Samokhvalov, Maria Akhnokh, Kyra Lee, Woo Jung Cho, Abhijit Takawale, Xiuhua Wang, Zamaneh Kassiri, John M Seubert
BACKGROUND: Pathophysiological responses, including cardiovascular complications, often alter with age. Cardioprotective effects of epoxyeicosatrienoic acids (EETs) toward acute myocardial ischemia-reperfusion injury have been well documented. However, biological relevance of EET-evoked cardioprotection in the ageing myocardium remains unknown. EETs are metabolized to less active metabolites by the enzyme soluble epoxide hydrolase (sEH). This study uses permanent occlusion of the left anterior descending artery (LAD) in young and aged sEH null and WT mice to compare cardiac and mitochondrial function following ischemic injury...
January 16, 2017: Prostaglandins & Other Lipid Mediators
https://www.readbyqxmd.com/read/28104162/hypoxia-inducible-factor-1%C3%AE-expression-in-kidney-transplant-biopsy-specimens-after-reperfusion-is-associated-with-early-recovery-of-graft-function-after-cadaveric-kidney-transplantation
#3
T Oda, T Ishimura, N Yokoyama, S Ogawa, H Miyake, M Fujisaw
BACKGROUND: Ischemia/reperfusion injury during kidney transplantation (KTx) delays allograft recovery. Hypoxia-inducible factor-1α (HIF-1α) is the key regulator of the protective response to ischemia/reperfusion injury. We evaluated the impact of the HIF-1α signaling pathway on allograft recovery during cadaveric KTx. METHODS: Between 1996 and 2015, 46 patients underwent cadaveric KTx. The expression levels of HIF-1α-related proteins, including phosphoinositide 3-kinase, phosphorylated (p)-Akt, p-mammalian target of rapamycin, p-Eukaryotic translation initiation factor 4E, p-S6 ribosomal protein, and HIF-1α, were immunohistochemically evaluated and semi-quantitatively scored in graft biopsy specimens after 1 hour of revascularization...
January 2017: Transplantation Proceedings
https://www.readbyqxmd.com/read/28103118/park2-dependent-mitophagy-induced-by-acidic-postconditioning-protects-against-focal-cerebral-ischemia-and-extends-the-reperfusion-window
#4
Zhe Shen, Yanrong Zheng, Jiaying Wu, Ying Chen, Xiaoli Wu, Yiting Zhou, Yang Yuan, Shousheng Lu, Lei Jiang, Zhenghong Qin, Zhong Chen, Weiwei Hu, Xiangnan Zhang
Prompt reperfusion after cerebral ischemia is critical for neuronal survival. Any strategies that extend the limited reperfusion window will be of great importance. Acidic postconditioning (APC) is a mild acidosis treatment that involves inhaling CO2 during reperfusion following ischemia. APC attenuates ischemic brain injury although the underlying mechanisms have not been elucidated. Here we report that APC reinforces ischemia-reperfusion-induced mitophagy in middle cortical artery occlusion (MCAO)-treated mice, and in oxygen-glucose deprivation (OGD)-treated brain slices and neurons...
January 19, 2017: Autophagy
https://www.readbyqxmd.com/read/28100764/drip-n-ship-versus-mothership-for-endovascular-treatment-modeling-the-best-transportation-options-for-optimal-outcomes
#5
Matthew S W Milne, Jessalyn K Holodinsky, Michael D Hill, Anders Nygren, Chao Qiu, Mayank Goyal, Noreen Kamal
BACKGROUND AND PURPOSE: There is uncertainty regarding the best way for patients outside of endovascular-capable or Comprehensive Stroke Centers (CSC) to access endovascular treatment for acute ischemic stroke. The role of the nonendovascular-capable Primary Stroke Centers (PSC) that can offer thrombolysis with alteplase but not endovascular treatment is unclear. A key question is whether average benefit is greater with early thrombolysis at the closest PSC before transportation to the CSC (Drip 'n Ship) or with PSC bypass and direct transport to the CSC (Mothership)...
January 18, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28097803/regulation-of-mrna-following-brain-ischemia-and-reperfusion
#6
REVIEW
Donald J DeGracia
There is growing appreciation that mRNA regulation plays important roles in disease and injury. mRNA regulation and ribonomics occur in brain ischemia and reperfusion (I/R) following stroke and cardiac arrest and resuscitation. It was recognized over 40 years ago that translation arrest (TA) accompanies brain I/R and is now recognized as part of the intrinsic stress responses triggered in neurons. However, neuron death correlates to a prolonged TA in cells fated to undergo delayed neuronal death (DND). Dysfunction of mRNA regulatory processes in cells fated to DND prevents them from translating stress-induced mRNAs such as heat shock proteins...
January 17, 2017: Wiley Interdisciplinary Reviews. RNA
https://www.readbyqxmd.com/read/28097310/combined-intravenous-thrombolysis-and-thrombectomy-vs-thrombectomy-alone-for-acute-ischemic-stroke-a-pooled-analysis-of-the-swift-and-star-studies
#7
Jonathan M Coutinho, David S Liebeskind, Lee-Anne Slater, Raul G Nogueira, Wayne Clark, Antoni Dávalos, Alain Bonafé, Reza Jahan, Urs Fischer, Jan Gralla, Jeffrey L Saver, Vitor M Pereira
Importance: Mechanical thrombectomy (MT) improves clinical outcomes in patients with acute ischemic stroke (AIS) caused by a large vessel occlusion. However, it is not known whether intravenous thrombolysis (IVT) is of added benefit in patients undergoing MT. Objective: To examine whether treatment with IVT before MT with a stent retriever is beneficial in patients undergoing MT. Design, Setting, and Participants: This post hoc analysis used data from 291 patients treated with MT included in 2 large, multicenter, prospective clinical trials that evaluated MT for AIS (Solitaire With the Intention for Thrombectomy performed from January 1, 2010, through December 31, 2011, and Solitaire Flow Restoration Thrombectomy for Acute Revascularization from January 1, 2010, through December 31, 2012)...
January 9, 2017: JAMA Neurology
https://www.readbyqxmd.com/read/28097005/the-cardioprotective-efficacy-of-tvp1022-against-ischemia-reperfusion-injury-and-cardiac-remodeling-in-rats
#8
Assaf Malka, Offir Ertracht, Noa Bachner-Hinenzon, Irina Reiter, Ofer Binah
Following acute myocardial infarction (MI), early and successful reperfusion is the most effective strategy for reducing infarct size and improving the clinical outcome. However, immediate restoration of blood flow to the ischemic zone results in myocardial damage, defined as "reperfusion-injury". Whereas we previously reported that TVP1022 (the S-isomer of rasagiline, FDA-approved anti-Parkinson drug) decreased infarct size 24 h post ischemia reperfusion (I/R) in rats, in this study we investigated the chronic cardioprotective efficacy of TVP1022 14 days post-I/R...
December 2016: Pharmacology Research & Perspectives
https://www.readbyqxmd.com/read/28094329/fumarase-activity-an-in-vivo-and-in-vitro-biomarker-for-acute-kidney-injury
#9
Per Mose Nielsen, Abubakr Eldirdiri, Lotte Bonde Bertelsen, Hans Stødkilde Jørgensen, Jan Henrik Ardenkjaer-Larsen, Christoffer Laustsen
Renal ischemia/reperfusion injury (IRI) is a leading cause of acute kidney injury (AKI), and at present, there is a lack of reliable biomarkers that can diagnose AKI and measure early progression because the commonly used methods cannot evaluate single-kidney IRI. Hyperpolarized [1,4-(13)C2]fumarate conversion to [1,4-(13)C2]malate by fumarase has been proposed as a measure of necrosis in rat tumor models and in chemically induced AKI rats. Here we show that the degradation of cell membranes in connection with necrosis leads to elevated fumarase activity in plasma and urine and secondly that hyperpolarized [1,4-(13)C2]malate production 24 h after reperfusion correlates with renal necrosis in a 40-min unilateral ischemic rat model...
January 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28093764/pre-ischemic-mitochondrial-substrate-constraint-by-inhibition-of-malate-aspartate-shuttle-preserves-mitochondrial-function-after-ischemia-reperfusion
#10
Nichlas Riise Jespersen, Takashi Yokota, Nicolaj Brejnholt Støttrup, Andreas Bergdahl, Kim Bolther Paelestik, Jonas Agerlund Povlsen, Flemming Dela, Hans Erik Bøtker
Mitochondrial dysfunction plays a central role in ischemia-reperfusion (IR) injury. The pre-ischemic administration of aminooxyacetate (AOA), an inhibitor of the malate-aspartate shuttle (MAS), provides cardioprotection against IR injury, but the underlying mechanism remains unknown. We hypothesized that a transient inhibition of the MAS during ischemia and early reperfusion could preserve mitochondrial function at later phase of reperfusion in IR-injured heart to the same extent as ischemic preconditioning (IPC), which is a well-validated cardioprotective strategy against IR injury...
January 17, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28093478/long-non-coding-rna-malat1-regulates-cerebrovascular-pathologies-in-ischemic-stroke
#11
Xuejing Zhang, Xuelian Tang, Kai Liu, Milton H Hamblin, Ke-Jie Yin
: The study is designed to determine the role of long non-coding RNA (lncRNA), metastasis associated lung adenocarcinoma transcript 1 (Malat1), in ischemic stroke outcome. Primary mouse brain microvascular endothelial cells (BMECs) were cultured and treated with Malat1 GapmeR prior to 16h oxygen and glucose depravation (OGD). Cell death was assayed by LDH and MTT methods. Malat1 knockout and wildtype mice were subjected to 1h of middle cerebral artery occlusion (MCAO) and 24-72h of reperfusion...
January 16, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28092166/subchronic-metformin-pretreatment-enhances-novel-object-recognition-memory-task-in-forebrain-ischemia-behavioural-molecular-and-electrophysiological-studies
#12
Ghorbangol Ashabi, Alireza Sarkaki, Fariba Khodagholi, Shima Zareh Shahamati, Mahdi Goudarzvand, Yaghoob Farbood, Mohammad Badavi, Leila Khalaj
Metformin exerts its effect via AMP-activated protein kinase (AMPK), which is a key sensor for energy homeostasis that regulates different intracellular pathways. Metformin attenuates oxidative stress and cognitive impairment. In our experiment, rats were divided into 8 groups; some were pretreated with metformin (Met, 200 mg/kg) and (or) the AMPK inhibitor Compound C (CC) for 14 days. On day 14, rats underwent transient forebrain global ischemia. Data indicated that pretreatment of ischemic rats with metformin reduced working memory deficits in a novel object recognition test compared to group with ischemia-reperfusion (I-R) (P < 0...
November 4, 2016: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28090786/inorganic-nitrite-modulates-mirna-signatures-in-acute-myocardial-in-vivo-ischemia-reperfusion
#13
Ulrike B Hendgen-Cotta, Daniel Messiha, Sonja Esfeld, René Deenen, Tienush Rassaf, Matthias Totzeck
Acute myocardial infarction is the leading cause of mortality in the industrialized world. While it is essential to attempt an early reperfusion of ischemic myocardial territories, reperfusion itself adds damage to the heart, the ischemia-reperfusion (I/R) injury. Particularly the injury resulting from the very first minutes of reperfusion remains incompletely understood. MicroRNAs (miRNAs) are dynamic regulators in I/R injury. Nitric oxide (•NO) signaling, in turn, interacts with miRNA signaling. Our previous investigations showed that •NO signaling in I/R could be modulated by nitrite...
January 16, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28089662/electroacupuncture-pretreatment-attenuates-spinal-cord-ischemia-reperfusion-injury-via-inhibition-of-high-mobility-group-box-1-production-in-a-lxa4-receptor-dependent-manner
#14
Xiao-Ling Zhu, Xin Chen, Wei Wang, Xu Li, Jia Huo, Yu Wang, Yu-Yuan Min, Bin-Xiao Su, Jian-Ming Pei
Paraplegia caused by spinal cord ischemia is a severe complication following surgeries in the thoracic aneurysm. HMGB1 has been recognized as a key mediator in spinal inflammatory response after spinal cord injury. Electroacupuncture (EA) pretreatment could provide neuroprotection against cerebral ischemic injury through inhibition of HMGB1 release. Therefore, the present study aims to test the hypothesis that EA pretreatment protects against spinal cord ischemia-reperfusion (I/R) injury via inhibition of HMGB1 release...
January 12, 2017: Brain Research
https://www.readbyqxmd.com/read/28089577/neutralizing-anti-interleukin-1%C3%AE-antibodies-reduce-ischemia-related-interleukin-1%C3%AE-transport-across-the-blood-brain-barrier-in-fetal-sheep
#15
Aparna Patra, Xiaodi Chen, Grazyna B Sadowska, Jiyong Zhang, Yow-Pin Lim, James F Padbury, William A Banks, Barbara S Stonestreet
Hypoxic ischemic insults predispose to perinatal brain injury. Pro-inflammatory cytokines are important in the evolution of this injury. Interleukin-1β (IL-1β) is a key mediator of inflammatory responses and elevated IL-1β levels in brain correlate with adverse neurodevelopmental outcomes after brain injury. Impaired blood-brain barrier (BBB) function represents an important component of hypoxic-ischemic brain injury in the fetus. In addition, ischemia-reperfusion increases cytokine transport across the BBB of the ovine fetus...
January 9, 2017: Neuroscience
https://www.readbyqxmd.com/read/28089232/prevalence-of-ischemic-heart-disease-and-associated-factors-in-patients-with-rheumatoid-arthritis-in-southern-brazil
#16
Rafael Kmiliauskis Santos Gomes, Ana Carolina Albers, Ana Isadora Pianowski Salussoglia, Ana Maria Bazzan, Luana Cristina Schreiner, Mateus Oliveira Vieira, Patrícia Giovana da Silva, Patrícia Helena Machado, Cynthia Mara da Silva, Mauro Marcelo Mattos, Moacyr Roberto Cuce Nobre
OBJECTIVE: To estimate the prevalence of ischemic heart disease and associated factors in patients with rheumatoid arthritis. METHODS: A cross-sectional study using the American College of Rheumatology diagnostic criteria in order to select patients seen at primary or secondary health care units in Blumenau, Santa Catarina, Southern Brazil, in 2014. The presence of ischemic heart disease was defined as an acute myocardial infarction with percutaneous coronary intervention or coronary artery bypass graft surgery that has occurred after diagnosis...
December 21, 2016: Revista Brasileira de Reumatologia
https://www.readbyqxmd.com/read/28087726/benefit-of-mineralocorticoid-receptor-antagonism-in-aki-role-of-vascular-smooth-muscle-rac1
#17
Jonatan Barrera-Chimal, Gwennan André-Grégoire, Aurelie Nguyen Dinh Cat, Sebastian M Lechner, Jérôme Cau, Sonia Prince, Peter Kolkhof, Gervaise Loirand, Vincent Sauzeau, Thierry Hauet, Frédéric Jaisser
AKI is a frequent complication in hospitalized patients. Unfortunately, there is no effective pharmacologic approach for treating or preventing AKI. In rodents, mineralocorticoid receptor (MR) antagonism prevents AKI induced by ischemia-reperfusion (IR). We investigated the specific role of vascular MR in mediating AKI induced by IR. We also assessed the protective effect of MR antagonism in IR-induced AKI in the Large White pig, a model of human AKI. In mice, MR deficiency in smooth muscle cells (SMCs) protected against kidney IR injury...
January 13, 2017: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/28087473/salvianolic-acids-for-injection-safi-suppresses-inflammatory-responses-in-activated-microglia-to-attenuate-brain-damage-in-focal-cerebral-ischemia
#18
Pengwei Zhuang, Yanjun Wan, Shihan Geng, Ying He, Bo Feng, Zhengliang Ye, Dazheng Zhou, Dekun Li, Hongjun Wei, Hongyan Li, Yanjun Zhang, Aichun Ju
BACKGROUND: Inflammatory reactions induced by microglia in the brain play crucial roles in ischemia/reperfusion (I/R) cerebral injuries. Microglia activation has been shown to be closely related to TLR4/NF-κB signal pathways. Salvianolic acids for injection (SAFI) have been used in clinical practice to treat ischemic stroke with reported neuroprotective effects; however, the underlying mechanisms are still uncertain. OBJECTIVE AND METHODS: First, we studied the effect of SAFI on inflammatory responses in LPS-stimulated BV-2 microglia...
January 10, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28087295/postconditioning-induced-neuroprotection-mechanisms-and-applications-in-cerebral-ischemia
#19
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/28081514/role-of-mirna-1-in-regulating-connexin-43-in-ischemia-reperfusion-heart-injury-a-rat-model
#20
Bo Bian, Xue-Fang Yu, Guo-Qin Wang, Tian-Ming Teng
MiRNA-1 may participate in regulating ischemia-reperfusion injury (IRI) by affecting the expression and distribution of connexin 43 (Cx43). The aim of this study is to investigate miR-1 expression and its potential role in regulating Cx43 during ischemic postconditioning (IPOST) in a rat model. Fifty-five Wistar male rats were randomly divided into five groups: N, IR, IPOST, agomir-1, and antagomir-1 group. The hearts were perfused with the Langendorff system. The reperfusion arrhythmia (RA) and myocardial infarct size were observed and recorded...
January 3, 2017: Cardiovascular Pathology: the Official Journal of the Society for Cardiovascular Pathology
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