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Reperfusion injury

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https://www.readbyqxmd.com/read/28445993/berberine-nanoparticles-protects-tubular-epithelial-cells-from-renal-ischemia-reperfusion-injury
#1
Da Xie, Yong Xu, Wang Jing, Zeng Juxiang, Li Hailun, Hu Yu, Dong-Hui Zheng, Yong-Tao Lin
Renal ischemia-reperfusion (I/R) injury is one of the most common causes of acute renal failure, the prognosis of which remains poor and there still lacks of effective therapeutics available in the clinic. This study aimed at investigating the effects of Berberine nanoparticles (BBR-NP) on the ischemia-reperfusion injury of renal tubular epithelial cells and underlying the mechanisms. Our results showed that in a rat model of renal I/R injury, BBR and BBR-NP protected renal against injury both functionally (as assessed by serum urea nitrogen and creatinine level) and morphologically (as assessed by HE staining, transmission electron microscopy and TUNEL staining) in a dose-dependent manner, with the effects of BBR-NP superior to BBR alone...
April 11, 2017: Oncotarget
https://www.readbyqxmd.com/read/28445367/adipose-tissue-drives-response-to-ischemia-reperfusion-injury-in-a-murine-pressure-sore-model
#2
Madeleine J Gust, Seok Jong Hong, Robert C Fang, Steven T Lanier, Donald W Buck, Jennifer M Nuñez, Shengxian Jia, Eugene D Park, Robert D Galiano, Thomas A Mustoe
BACKGROUND: Ischemia-reperfusion injury contributes significantly to the pathogenesis of chronic wounds such as pressure sores and diabetic foot ulcers. The authors' laboratory has previously developed a cyclical murine ischemia-reperfusion injury model. The authors here use this model to determine factors underlying tissue response to ischemia-reperfusion injury. METHODS: C57BL/6 mice were subjected to cycles of ischemia-reperfusion that varied in number (one to four cycles) and duration of ischemia (1 to 2 hours)...
May 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28445296/a-case-of-cerebral-hyperperfusion-following-spontaneous-recanalization-of-occluded-middle-cerebral-artery-reperfusion-injury-or-true-cerebral-hyperperfusion-syndrome
#3
Ziqi Xu, Jiajia Zhou, Hui Liang, Benyan Luo, Ping Liu
BACKGROUND: Cerebral hyperperfusion syndrome (CHS) and reperfusion injury are distinct pathological phenomena. CASE SUMMARY: We present the case of a young ischemic stroke patient with middle cerebral artery (MCA) occlusion and spontaneous recanalization. Follow-up transcranial Doppler ultrasound showed high velocity flow in the left MCA, and neuroimaging revealed infarction, brain edema, artery dilatation, and hyperperfusion, consistent with both CHS and reperfusion injury...
April 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28445087/cardioprotection-by-mild-hypothermia-is-abolished-in-aged-mice
#4
Junjie Guo, Shuning Zhang, Leilei Ma, Hongtao Shi, Jianbing Zhu, Jian Wu, Yi An, Junbo Ge
Mild hypothermia (MH) renders the hearts resistant to ischemia/reperfusion (IR) injury in animal experiments. Unexpectedly, this effect was not observed in recent clinical trials. The aged hearts in mice have been demonstrated to be more susceptible to IR injury. This study aimed to examine whether the cardioprotection of MH was abolished in aged mice. Young (Y, 3 months old) and aged (A, 20 months old) male C57BL/6 mice were randomized into six groups. Sham (Y-SHAM and A-SHAM) and control (Y-CON+IR and A-CON+IR) animals maintained core body temperature at 37°C ± 0...
April 26, 2017: Therapeutic Hypothermia and Temperature Management
https://www.readbyqxmd.com/read/28444847/complement-dependence-of-murine-costimulatory-blockade-resistant-cellular-cardiac-allograft-rejection
#5
Nicholas Chun, Robert L Fairchild, Yansui Li, Jinhua Liu, Ming Zhang, William M Baldwin, Peter S Heeger
Building upon studies showing that ischemia/reperfusion-(IR)-injury is complement-dependent, we tested links among complement activation, transplant associated ischemia-reperfusion injury, and murine cardiac allograft rejection. We transplanted BALB/c hearts subjected to 8h cold ischemic storage (CIS) into CTLA4Ig-treated WT or c3(-/-) B6 recipients. Whereas allografts subjected to 8h CIS rejected in WT recipients with a median survival time (MST) of 37d, identically treated hearts survived >60d in c3(-/-) mice (p<0...
April 26, 2017: American Journal of Transplantation
https://www.readbyqxmd.com/read/28444132/tyrosine-phosphorylation-of-enos-regulates-myocardial-survival-after-an-ischaemic-insult-role-of-pyk2
#6
Sofia-Iris Bibli, Zongmin Zhou, Sven Zukunft, Beate Fisslthaler, Ioanna Andreadou, Csaba Szabo, Peter Brouckaert, Ingrid Fleming, Andreas Papapetropoulos
Aims: Endothelial nitric oxide (NO) synthase (eNOS) is known to play a cardioprotective protective. However, the molecular mechanisms regulating eNOS activity during ischaemia/reperfusion (I/R) injury are incompletely understood. eNOS is a substrate for several kinases that positively or negatively affect its enzymatic activity. Herein, we sought to correlate eNOS phosphorylation status with cardiomyocyte survival and we investigated the contribution of the proline-rich tyrosine kinase 2 (PYK2)/eNOS axis to the regulation of myocardial infarct size in vivo...
April 20, 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/28444063/effect-of-lactation-on-myocardial-vulnerability-to-ischemic-insult-in-rats
#7
Sahar Askari, Alireza Imani, Hamidreza Sadeghipour, Mahdieh Faghihi, Zohreh Edalatyzadeh, Samira Choopani, Nasser Karimi, Sulail Fatima
Background: Cardiovascular diseases are the leading cause of mortality and long-term disability worldwide. Various studies have suggested a protective effect of lactation in reducing the risk of cardiovascular diseases. Objective: This study was designed to assess the effects of pregnancy and lactation on the vulnerability of the myocardium to an ischemic insult. Methods: Eighteen female rats were randomly divided into three groups: ischemia-reperfusion (IR), in which the hearts of virgin rats underwent IR (n = 6); lactating, in which the rats nursed their pups for 3 weeks and the maternal hearts were then submitted to IR (n = 6); and non-lactating, in which the pups were separated after birth and the maternal hearts were submitted to IR (n = 6)...
April 20, 2017: Arquivos Brasileiros de Cardiologia
https://www.readbyqxmd.com/read/28443590/effects-of-apigenin-on-experimental-ischemia-reperfusion-injury-in-the-rat-ovary
#8
Zeynep Soyman, Sefa Kelekçi, Veysel Sal, Osman Şevket, Nihan Bayındır, Hafize Uzun
BACKGROUND: Apigenin, is a plant-derived compound belonging to flavone class, possess antioxidant, free radical scavenging and anti-inflammatory manners. AIMS: This paper aims to address effects of apigenin upon serum antimüllerian hormone (AMH) levels, tissue oxidative stress parameters and histopathological changes in ovarian ischemia/reperfusion (I/R) injury. STUDY DESIGN: Animal experiment. METHODS: Twenty eight female Wistar albino rats have been separated to four sections in a random way: Sham operation (Group 1), I/R plus saline (Group 2), I/R plus dimethyl sulfoxide (Group 3) and I/R plus apigenin (Group 4)...
April 13, 2017: Balkan Medical Journal
https://www.readbyqxmd.com/read/28443506/catestain-a-master-regulator-of-cardiovascular-functions
#9
Sushil K Mahata, Malapaka Kiranmayi, Nitish R Mahapatra
Cardiovascular disease (CVD), the most common cause of death globally, accounts for ~30% of all deaths worldwide. Hypertension is a common contributor to morbidity and mortality from CVD. The plasma concentration of chromogranin A (CgA) is elevated in patients with CVD as well as patients with established human essential hypertension and heart failure (HF). In contrast, the plasma level of the CgA-derived peptide catestatin (CST) is diminished in human essential hypertension. Low conversion of CgA-to-CST has been associated with increased mortality in patients hospitalized with acute HF...
April 24, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28442910/targeted-delivery-of-thymosin-beta-4-to-the-injured-myocardium-using-creka-conjugated-nanoparticles
#10
Zheyong Huang, Yanan Song, Zhiqing Pang, Bo Zhang, Hongbo Yang, Hongtao Shi, Jing Chen, Hui Gong, Juying Qian, Junbo Ge
PURPOSE: Thymosin beta 4 (Tβ4) has multiple beneficial facets for myocardial injury, but its efficiency is limited by the low local concentration within the infarct. Here, we established a Tβ4 delivery system for cardiac repair based on the interaction between the abundant fibrin in the infarct zone and the fibrin-targeting moiety clot-binding peptide cysteine-arginine-glutamic acid-lysine-alanine (CREKA). METHODS AND RESULTS: CREKA and Tβ4 were conjugated to nanoparticles (CNP-Tβ4)...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28442264/mitochondrial-lon-protease-dependent-degradation-of-cytochrome-c-oxidase-subunits-under-hypoxia-and-myocardial-ischemia
#11
Naresh B V Sepuri, Rajesh Angireddy, Satish Srinivasan, Manti Guha, Joseph Spear, Bin Lu, Hindupur K Anandatheerthavarada, Carolyn K Suzuki, Narayan G Avadhani
The mitochondrial ATP dependent matrix protease, Lon, is involved in the maintenance of mitochondrial DNA nucleoids and degradation of abnormal or misfolded proteins. The Lon protease regulates mitochondrial Tfam (mitochondrial transcription factor A) level and thus modulates mitochondrial DNA (mtDNA) content. We have previously shown that hypoxic stress induces the PKA-dependent phosphorylation of cytochrome c oxidase (CcO) subunits I, IVi1, and Vb and a time-dependent reduction of these subunits in RAW 264...
April 22, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28442025/protective-effects-of-polydatin-on-experimental-testicular-torsion-and-detorsion-injury-in-rats
#12
Huilian Qiao, He Ma, Wanjun Cao, Hao Chen, Jinhua Wei, Zhen Li
Oxidative stress plays a critical role in the process of testicular torsion and detorsion (T/D). The purpose of the present study was to investigate the protective effect of polydatin (PD) on testicular T/D injury. Rats were randomly divided into three groups, a sham group, a group subjected to 2h torsion followed by 24h detorsion and a group subjected to T/D and injected i.p. with 20mgkg-1 PD 30min before detorsion. Unilateral orchiectomy was performed after 24h of reperfusion. Half the testes were prepared for histological examination by haematoxylin-eosin staining and the terminal deoxyribonucleotidyl transferase-mediated dUTP-digoxigenin nick end-labelling (TUNEL) technique...
April 26, 2017: Reproduction, Fertility, and Development
https://www.readbyqxmd.com/read/28441917/identification-of-il-17a-derived-neural-cell-type-and-dynamic-changes-of-il-17a-in-serum-csf-of-mice-with-ischemic-stroke
#13
Shujuan Li, Qingqing Dai, Jinling Yu, Ting Liu, Shuiqiao Liu, Longhui Ma, Ying Zhang, Song Han, Junfa Li
BACKGROUND: Interleukin (IL)-17A was reported to be involved in the development of post-ischemic stroke inflammatory response and functional recovery. However, the IL-17A dynamic changes in serum/cerebrospinal fluid (CSF) and its role in neuronal injury following ischemic stroke are unclear. METHODS: In vivo ischemic stroke was induced by 1 h of middle cerebral artery occlusion (MCAO) and 6 h-7 d reperfusion (R) in mice, while in vitro stroke was induced by 1 h oxygen-glucose deprivation (OGD)/24 h reoxygenation (R) in cultured cortical neurons...
April 25, 2017: Neurological Research
https://www.readbyqxmd.com/read/28441386/graft-derived-cell-free-dna-a-noninvasive-early-rejection-and-graft-damage-marker-in-liver-transplantation-a-prospective-observational-multicenter-cohort-study
#14
Ekkehard Schütz, Anna Fischer, Julia Beck, Markus Harden, Martina Koch, Tilo Wuensch, Martin Stockmann, Björn Nashan, Otto Kollmar, Johannes Matthaei, Philipp Kanzow, Philip D Walson, Jürgen Brockmöller, Michael Oellerich
BACKGROUND: Graft-derived cell-free DNA (GcfDNA), which is released into the blood stream by necrotic and apoptotic cells, is a promising noninvasive organ integrity biomarker. In liver transplantation (LTx), neither conventional liver function tests (LTFs) nor immunosuppressive drug monitoring are very effective for rejection monitoring. We therefore hypothesized that the quantitative measurement of donor-derived cell-free DNA (cfDNA) would have independent value for the assessment of graft integrity, including damage from acute rejection...
April 2017: PLoS Medicine
https://www.readbyqxmd.com/read/28440874/role-of-glycogen-synthase-kinase-3-in-ischemia-induced-blood-brain-barrier-disruption-in-aged-female-rats
#15
Han Xiao, Mingyang Deng, Binbin Yang, Jianguang Tang, Zhiping Hu
Estrogen receptors have protective effects against ischemic brain injury. However, the molecular mechanisms underlying this phenomenon have yet to be well studied. Given that inhibition of glycogen synthase kinase (GSK3) can reduce cerebral ischemia/reperfusion injury, we hypothesized that estrogen receptors-mediated protective effects against ischemia-induced blood brain barrier (BBB) disruption involve inhibition of GSK3. Thus, we evaluated GSK3 expression in the brain of ovariectomized female rats, and examined the effects of intracerebroventricular pre-treatments of SB216763, GSK3 inhibitor, on BBB permeability following middle cerebral artery occlusion (MCAO)...
April 25, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28440739/featured-article-pharmacological-postconditioning-with-delta-opioid-attenuates-myocardial-reperfusion-injury-in-isolated-porcine-hearts
#16
Maria Seewald, James A Coles, Daniel C Sigg, Paul A Iaizzo
Ischemic preconditioning has been utilized to protect the heart from ischemia prior to ischemia onset, whereas postconditioning is employed to minimize the consequences of ischemia at the onset of reperfusion. The underlying mechanisms and pathways of ischemic pre- and postconditioning continue to be investigated as therapeutic targets. We evaluated the administration of a delta opioid agonist or cariporide on various parameters associated with myocardial reperfusion injury upon reperfusion of isolated porcine hearts...
May 2017: Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28440490/microrna-15a-inhibition-protects-against-hypoxia-reoxygenation-induced-apoptosis-of-cardiomyocytes-by-targeting-mothers-against-decapentaplegic-homolog-7
#17
Yang Yang, Shiao Ding, Gaojun Xu, Fei Chen, Fangbao Ding
Myocardial ischemia/reperfusion (I/R) injury is a major pathological process in coronary heart disease and cardiac surgery, and is associated with aberrant microRNA (miR) expression. Previous studies have demonstrated that inhibition of miR-15a expression may ameliorate I/R‑induced myocardial injury. In the present study, the potential role and underlying mechanism of miR‑15a in hypoxia/reoxygenation‑induced apoptosis of cardiomyocytes was investigated. Myocardial I/R was simulated in cultured H9c2 cells by 24 h hypoxia followed by 24 h reoxygenation...
April 12, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28439774/albumin-induced-neuroprotection-in-focal-cerebral-ischemia-in-the-alias-trial-does-severity-mechanism-and-time-of-infusion-matter
#18
Rakesh Khatri, Mohammad Rauf Afzal, Gustavo J Rodriguez, Alberto Maud, Muhammad Shah Miran, Mohtashim Arbaab Qureshi, Salvador Cruz-Flores, Adnan I Qureshi
OBJECTIVE: To determine whether there is any differential benefit of albumin administration within 2 h of onset of ischemia and in settings (severe ischemia with reperfusion in cardioembolic strokes with National Institutes of Health Stroke Scale [NIHSS] ≥15), most representative of experimental models of cerebral ischemia in which albumin was effective in reducing neurological injury. BACKGROUND: High-dose intravenous (IV) albumin treatment for acute ischemic stroke (ALIAS) trial did not show overall clinical benefit in ischemic stroke patients in contrast to preclinical studies; however, models of preclinical studies were not completely followed...
April 24, 2017: Neurocritical Care
https://www.readbyqxmd.com/read/28438640/neutralizing-il-6-reduces-heart-injury-by-decreasing-nerve-growth-factor-precursor-in-the-heart-and-hypothalamus-during-rat-cardiopulmonary-bypass
#19
Chi Cheng, Jun-Mei Xu, Tian Yu
AIMS: To investigate whether the expression of nerve growth factor precursor (proNGF) changes during cardiopulmonary bypass (CPB) and whether neutralizing interleukin-6 (IL-6) during CPB has cardiac benefits. MAIN METHODS: Thirty patients undergoing CPB were recruited and their serum proNGF and troponin-I (TNI) were detected. In addition, rats were divided into three groups: CPB group, CPB with cardiac ischemia-reperfusion (IR) group, and a control group. The pre-CPB standard deviation of N-N intervals (SDNN) and post-CPB SDNN were compared...
April 21, 2017: Life Sciences
https://www.readbyqxmd.com/read/28438516/global-transcriptomic-profiling-of-cortex-and-striatum-cerebral-injury-after-ischemia-reperfusion-in-a-mouse-model
#20
Zhenying Zhao, Zhiqiang Lu, Xiuying Sun, Tianhong Zhao, Jihong Zhang, Cunxia Zhou, Xiaohui Zheng, Huijuan Zhang, Guiling Shi
OBJECTIVE: This study aims to investigate the molecular mechanism of injury development in the cortex and the striatum after cerebral ischemia/reperfusion (I/R). METHODS: Gene expression data (GSE23160) in the cortex and the striatum of an intraluminal middle cerebral artery occlusion-I/R mouse model (N = 12) and sham controls (N = 4) were downloaded from the Gene Expression Omnibus. Limma package was used to identify the differentially expressed genes (DEGs) between the I/R (2, 8, and 24 hours) and control groups...
April 21, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
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