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Ischemia protection

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https://www.readbyqxmd.com/read/28323976/protective-effects-of-fetal-zone-steroids-are-comparable-to-estradiol-in-hyperoxia-induced-cell-death-of-immature-glia
#1
Stephanie Hübner, Donna E Sunny, Christine Pöhlke, Johanna Ruhnau, Antje Vogelgesang, Bettina Reich, Matthias Heckmann
Impaired neurodevelopment in preterm infants is caused by prematurity itself; however, hypoxia/ischemia, inflammation, and hyperoxia contribute to the extent of impairment. Because preterm birth is accompanied by a dramatic decrease in 17β-estradiol (E2) and progesterone, preliminary clinical studies have been carried out to substitute these steroids in preterm infants; however, they failed to confirm significantly improved neurological outcomes. We therefore hypothesized that the persistently high postnatal production of fetal zone steroids (mainly dehydroepiandrosterone (DHEA)) until term could interfere with E2-mediated protection...
March 3, 2017: Endocrinology
https://www.readbyqxmd.com/read/28323531/mitophagy-receptor-fundc1-regulates-mitochondrial-homeostasis-and-protects-the-heart-from-i-r-injury
#2
Weilin Zhang, Sami Siraj, Rong Zhang, Quan Chen
Mitophagy plays pivotal roles in the selective disposal of unwanted mitochondria, and accumulation of damaged mitochondria has been linked to ageing-related diseases. However, definitive proof that mitophagy regulates mitochondrial quality in vivo is lacking. It is also largely unclear whether damaged mitochondria are the cause or just the consequence of these diseases. We previously showed that FUNDC1 is a mitophagy receptor that interacts with LC3 to mediate mitophagy in response to hypoxia in cultured cells...
March 21, 2017: Autophagy
https://www.readbyqxmd.com/read/28320107/pre-conditioning-with-tanshinone-iia-attenuates-the-ischemia-reperfusion-injury-caused-by-liver-grafts-via-regulation-of-hmgb1-in-rat-kupffer-cells
#3
Xuanfei Li, Yakun Wu, Wenfeng Zhang, Jianping Gong, Yao Cheng
OBJECTIVE: We have evaluated the protective mechanism of tanshinone IIA in ischemia/reperfusion injury (IRI) induced by liver grafts, revealing novel supplementary immunotherapy for liver transplantation. METHODS: The tanshinone IIA preconditioning group (TP group) was pretreated with tanshinone IIA via intraperitoneal injection for 1 week before receiving orthotopic liver transplantation with hepatic arterial ischemia for 30min. The sham-operation group (SO group), control graft group (CG group) and IRI group were pretreated with an equivalent volume of normal saline...
March 18, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28320101/effect-of-melilotus-officinalis-extract-on-the-apoptosis-of-brain-tissues-by-altering-cerebral-thrombosis-and-inflammatory-mediators-in-acute-cerebral-ischemia
#4
Gui-Cun Zhao, Yan-Ling Yuan, Feng-Rong Chai, Fa-Jing Ji
Present investigation evaluates the protective effect of Melilotus officinalis (MO) extract on the brain tissues in acute cerebral ischemia. Acute cerebral ischemia was induced by occlusion of carotid artery and rats with cerebral ischemia were treated with MO (100, 250 & 500mg/kg) for the duration of three days. Cerebral ischemia was confirmed by estimating infract volume and neurological deficit score. Moreover biochemical parameters in plasma such as 6-keto-PGF1α and TXB2 and concentration of cytokine, oxidative stress, apoptosis ratio and protein expressions of Bcl2 & Bax were estimated in the brain tissues...
March 17, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28320085/down-regulation-of-microrna-142-5p-attenuates-oxygen-glucose-deprivation-and-reoxygenation-induced-neuron-injury-through-up-regulating-nrf2-are-signaling-pathway
#5
Ning Wang, Lingmin Zhang, Yang Lu, Mingxin Zhang, Zhenni Zhang, Kui Wang, Jianrui Lv
MicroRNAs (miRNAs) play vital roles in regulating neuron survival during cerebral ischemia/reperfusion injury. miR-142-5p is reported to be an important regulator of cellular survival. However, little is known about the role of miR-142-5p in regulating neuron survival during cerebral ischemia/reperfusion injury. In this study, we aimed to investigate the precise function and mechanism of miR-142-5p in the regulation of neuron ischemia/reperfusion injury using a cellular model of oxygen-glucose deprivation and reoxygenation (OGD/R)-induced injury in hippocampal neurons in vitro...
March 14, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28319329/extracellular-acidosis-and-very-low-na-inhibit-nbcn1-and-nhe1-mediated-net-acid-extrusion-from-mouse-vascular-smooth-muscle-cells
#6
Lisbeth Bonde, Ebbe Boedtkjer
AIM: The electroneutral Na(+) ,HCO3(-) -cotransporter NBCn1 and Na(+) /H(+) -exchanger NHE1 regulate acid-base balance in vascular smooth muscle cells (VSMCs) and modify artery function and structure. Pathological conditions-notably ischemia-can dramatically perturb intracellular (i) and extracellular (o) pH and [Na(+) ]. We examined effects of low [Na(+) ]o and pHo on NBCn1 and NHE1 activity in VSMCs of small arteries. METHODS: We measured pHi by 2',7'-bis-(2-carboxyethyl)-5-(and-6)-carboxyfluorescein-based fluorescence microscopy of mouse mesenteric arteries and induced intracellular acidification by NH4(+) -prepulse technique...
March 20, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28318627/vascular-adhesion-protein-1-enhances-neutrophil-infiltration-by-generation-of-hydrogen-peroxide-in-renal-ischemia-reperfusion-injury
#7
Shinji Tanaka, Tetsuhiro Tanaka, Takahisa Kawakami, Hideki Takano, Mai Sugahara, Hisako Saito, Yoshiki Higashijima, Junna Yamaguchi, Reiko Inagi, Masaomi Nangaku
Vascular adhesion protein-1 (VAP-1) is a unique molecule since it acts as an adhesion molecule as well as an ectoenzyme catalyzing oxidative deamination of primary amines and generates hydrogen peroxide in the extracellular space. While VAP-1 is implicated in various inflammatory diseases, its role in acute kidney injury is less characterized. Here we studied VAP-1 expression in the kidney and the effect of its inhibition in a rat model of renal ischemia/reperfusion injury. VAP-1 was predominantly expressed in pericytes, which released enzymatically active enzyme...
March 16, 2017: Kidney International
https://www.readbyqxmd.com/read/28316125/deferoxamine-activated-hypoxia-inducible-factor-1-restores-cardioprotective-effects-of-sevoflurane-postconditioning-in-diabetic-rats
#8
Peng Xie, Long Yang, Ailaiti Talaiti, Jianjiang Wu, Jin Yu, Tian Yu, Haiying Wang, Bo Huang, Qin Wu, Yiliyaer Maimaitili, Jiang Wang, Haiping Ma, Yining Yang, Hong Zheng
AIM: The cardioprotective effects of sevoflurane postconditioning (SpostC) are eliminated under diabetic conditions, and the underlying mechanism for this phenomenon remains unclear. Many studies have demonstrated that the hypoxia-inducible factor-1(HIF-1) signaling pathway in the myocardium is impaired under diabetic conditions. This study was to investigate whether deferoxamine (DFO)-induced activation of HIF-1 signaling pathway can restore the cardioprotective effects of SpostC in diabetic rats...
March 17, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28316070/the-involvement-of-thrombin-in-the-pathogenesis-of-glioblastoma
#9
REVIEW
Harald Krenzlin, Viola Lorenz, Beat Alessandri
Prothrombin and its active derivative thrombin are key members of the coagulation system. The only site of extra-hepatic thrombin expression is the central nervous system (CNS), where it is involved in brain development, protection, and regeneration. Thrombin affects various degenerative and ischemic CNS diseases like Alzheimer's, multiple sclerosis, cerebral ischemia, and hemorrhage in a dose dependent manner. Additionally, the association of thrombin with various malignancies has recently become evident. Thrombin facilitates the interaction between tumor cells with platelets, endothelial cells, and the adhesion to matrix proteins in various tumor types...
March 19, 2017: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/28315310/combined-l-citrulline-and-glutathione-administration-prevents-neuronal-cell-death-following-transient-brain-ischemia
#10
Kazuya Matsuo, Yasushi Yabuki, Kohji Fukunaga
We previously reported that oral L-citrulline (L-Cit) administration antagonizes neuronal cell death in hippocampus following transient brain ischemia and that oral glutathione (GSH) administration prevents neuronal death through antioxidant activity. Here, we tested potential synergy of combined L-Cit and GSH administration in protection against neuronal death following cerebral ischemia. One day after a 20-min bilateral common carotid artery occlusion (BCCAO), mice were orally administered L-Cit or GSH alone (at 40 or 100 mg/kg p...
March 14, 2017: Brain Research
https://www.readbyqxmd.com/read/28315110/impact-of-astrocytes-on-the-injury-induced-by-in-vitro-ischemia
#11
Cláudio Roque, Graça Baltazar
Cell cultures are characterized by their simplicity, controllability, and ability to provide detailed basic information on how a particular cell population responds to specific stimuli or insult. These characteristics led to their extensive application in the study of molecular interactions and represent a valuable tool in the study of different pathologies. However, due to the lack of interactions between the different components that form an in vivo system, the results obtained in pure cell cultures not always translate what occurs in vivo...
March 17, 2017: Cellular and Molecular Neurobiology
https://www.readbyqxmd.com/read/28314876/effect-of-remote-ischemic-postconditioning-during-thrombolysis-in-stemi
#12
S Ghaffari, L Pourafkari, S Manzouri, N D Nader
BACKGROUND: Remote ischemic postconditioning (RIPC) is suggested to protect the myocardium against ischemia in various settings. However, the effect of RIPC in patients with acute ST-elevation myocardial infarction (STEMI) who undergo thrombolysis has yet to be examined. PATIENTS AND METHODS: In this single-center, randomized controlled trial, we examined the effect of RIPC on the resolution of ST-segment elevation (STR) in response to thrombolysis. Patients in the RIPC group had three cycles of 5‑min cuff inflation followed by 5‑min deflation to the upper arm...
March 17, 2017: Herz
https://www.readbyqxmd.com/read/28302075/renal-effects-of-metallothionein-induction-by-zinc-in-vitro-and-in-vivo
#13
Moritz Schanz, Lea Schaaf, Juergen Dippon, Dagmar Biegger, Peter Fritz, Mark Dominik Alscher, Martin Kimmel
BACKGROUND: Metallothionein (MTT) is an endogenous antioxidant that can be induced by both zinc (Zn) and ischemia. In kidneys, increased MTT expression exerts a putative protective role in diabetes and hypoxia. Our goal was to further investigate the behavior of MTT under the influence of Zn and hypoxia in vitro and in vivo. METHODS: MTT expression was measured in vitro in cell cultures of proximal tubular cells (LCC-PK1) by immune-histochemistry and real-time PCR after incubation with increasing concentrations of Zn under hypoxic and non-hypoxic conditions...
March 16, 2017: BMC Nephrology
https://www.readbyqxmd.com/read/28300560/doxycycline-protects-human-intestinal-cells-from-hypoxia-reoxygenation-injury-implications-from-an-in-vitro-hypoxia-model
#14
Lars Hummitzsch, Karina Zitta, Rouven Berndt, Matthias Kott, Christin Schildhauer, Kerstin Parczany, Markus Steinfath, Martin Albrecht
Intestinal ischemia/reperfusion (I/R) injury is a grave clinical emergency and associated with high morbidity and mortality rates. Based on the complex underlying mechanisms, a multimodal pharmacological approach seems necessary to prevent intestinal I/R injury. The antibiotic drug doxycycline, which exhibits a wide range of pleiotropic therapeutic properties, might be a promising candidate for also reducing I/R injury in the intestine. To investigate possible protective effects of doxycycline on intestinal I/R injury, human intestinal CaCo-2 cells were exposed to doxycycline at clinically relevant concentrations...
March 12, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28300551/role-of-caveolin-1-vascular-endothelial-growth-factor-pathway-in-basic-fibroblast-growth-factor-induced-angiogenesis-and-neurogenesis-after-treadmill-training-following-focal-cerebral-ischemia-in-rats
#15
Qiongyi Pang, Huimei Zhang, Zhenzhen Chen, Yudan Wu, Min Yidian Bai Liu, Yun Zhao, Fengxia Tu, Chan Liu, Xiang Chen
Exercise is known to aid functional recovery following ischemia, though the mechanisms responsible for the beneficial effects of exercise on recovery from ischemic stroke are not fully understood. Basic fibroblast growth factor (bFGF) contributes to angiogenesis and promotes neurologic functional recovery after stroke. The present study aimed to investigate the possible mechanisms whereby treadmill exercise ameliorated impaired angiogenesis and neurogenesis following transient cerebral ischemia in middle cerebral artery occlusion (MCAO) rats...
March 11, 2017: Brain Research
https://www.readbyqxmd.com/read/28300357/pilot-randomized-controlled-trial-on-early-and-late-remote-ischemic-preconditioning-prior-to-complex-cardiac-surgery-in-young-infants
#16
Gonzalo Garcia Guerra, Ari R Joffe, Rob Seal, Ernest Phillipos, Maggie Wong, Elham Khodayari Moez, Irina A Dinu, Jonathan P Duff, David Ross, Ivan Rebeyka, Charlene M T Robertson
BACKGROUND: Remote ischemic preconditioning involves providing a brief ischemia-reperfusion event to a tissue to create subsequent protection from a more severe ischemia-reperfusion event to a different tissue/organ. The few pediatric remote ischemic preconditioning studies in the literature show conflicting results. AIM: We conducted a pilot randomized controlled trial to determine the feasibility of conducting a larger trial and to gather provisional data on the effect of early and late remote ischemic preconditioning on outcomes of infants after surgery for congenital heart disease...
April 2017: Paediatric Anaesthesia
https://www.readbyqxmd.com/read/28299325/protective-effects-of-the-segmental-renal-artery-clamping-technique-on-ischemia-reperfusion-injury-in-db-db-diabetic-mice
#17
Chao Liang, Jundong Zhu, Chenkui Miao, Shangqian Wang, Lei Zhang, Pu Li, Zengjun Wang, Pengfei Shao
Renal ischemia-reperfusion (I/R) injury is inevitable in partial nephrectomy and other kidney surgeries, with a higher incidence in patients with renal insufficiency. This study aimed to investigate the protective effects of precise segmental renal artery clamping (SRAC) against renal I/R injury in db/db diabetic mice, compared with conventional renal artery clamping (RAC). Grape seed extract, a powerful free radical scavenger, was administered to diabetic mice for 4 weeks before operation in subgroups (30 mg/kg/d)...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28298633/specific-expression-of-heme-oxygenase-1-by-myeloid-cells-modulates-renal-ischemia-reperfusion-injury
#18
Maxime Rossi, Antoine Thierry, Sandrine Delbauve, Nicolas Preyat, Miguel P Soares, Thierry Roumeguère, Oberdan Leo, Véronique Flamand, Alain Le Moine, Jean-Michel Hougardy
Renal ischemia-reperfusion injury (IRI) is a major risk factor for delayed graft function in renal transplantation. Compelling evidence exists that the stress-responsive enzyme, heme oxygenase-1 (HO-1) mediates protection against IRI. However, the role of myeloid HO-1 during IRI remains poorly characterized. Mice with myeloid-restricted deletion of HO-1 (HO-1(M-KO)), littermate (LT), and wild-type (WT) mice were subjected to renal IRI or sham procedures and sacrificed after 24 hours or 7 days. In comparison to LT, HO-1(M-KO) exhibited significant renal histological damage, pro-inflammatory responses and oxidative stress 24 hours after reperfusion...
March 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28298332/impact-of-lifelong-exercise-training-on-endothelial-ischemia-reperfusion-and-ischemic-preconditioning-in-humans
#19
Martijn F H Maessen, Anke Ccm van Mil, Yaïra Straathof, Niels P Riksen, Gerard A P J M Rongen, Maria T E Hopman, Thijs M H Eijsvogels, Dick H J Thijssen
Reperfusion is essential for ischemic tissue survival, but causes additional damage to the endothelium (i.e. ischemia-reperfusion [IR] injury). Ischemic preconditioning (IPC) refers to short repetitive episodes of ischemia that can protect against IR. However, IPC efficacy attenuates with older age. Whether physical inactivity contributes to the attenuated efficacy of IPC to protect against IR injury in older humans is unclear. We tested the hypotheses that lifelong exercise training relates to 1) attenuated endothelial IR and 2) maintained IPC efficacy that protects veteran athletes against endothelial IR...
March 15, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28296550/protective-effects-of-salusin-%C3%AE-and-salusin-%C3%AE-on-renal-ischemia-reperfusion-damage-and-their-levels-in-ischemic-acute-renal-failure
#20
M Cakir, H Duzova, A Taslidere, G Orhan, F Ozyalin
Salusin-α and salusin-β are expressed in many tissues including the central nervous system, vessels and kidneys; they have been shown to decrease endoplasmic reticulum stress during heart ischemia/reperfusion (I/R) and to decrease apoptosis. We investigated the relation of salusin-α and salusin-β levels to acute ischemic renal failure. We also investigated whether these peptides are protective against renal I/R damage. Fifty-three rats were divided into six groups: control, I/R, I/R + salusin-α1, I/R + salusin-α10, I/R + salusin-β1 and I/R + salusin-β10...
2017: Biotechnic & Histochemistry: Official Publication of the Biological Stain Commission
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