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https://www.readbyqxmd.com/read/28094122/cardiac-remote-ischaemic-preconditioning-mechanistic-and-clinical-considerations
#1
REVIEW
Jerrett K Lau, Gabrielle J Pennings, Andy Yong, Leonard Kritharides
Brief, non-harmful ischaemic insults to an organ remote from the heart, remote ischaemic preconditioning (RIPC), has been proposed to confer protection to the heart against ischaemia-reperfusion injury. While most clinical trials of RIPC during coronary interventions (PCI) suggest benefit, recent large, multicentre trials in coronary artery bypass surgery suggest a lack of efficacy. Mechanistically, RIPC most likely promotes the release of circulating factors which modulate multiple cellular pathways in the heart, promoting cell survival...
December 12, 2016: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/28091727/intrinsic-cardiac-ganglia-and-acetylcholine-are-important-in-the-mechanism-of-ischaemic-preconditioning
#2
J M J Pickard, N Burke, S M Davidson, D M Yellon
This study aimed to investigate the role of the intrinsic cardiac nervous system in the mechanism of classical myocardial ischaemic preconditioning (IPC). Isolated perfused rat hearts were subjected to 35-min regional ischaemia and 60-min reperfusion. IPC was induced as three cycles of 5-min global ischaemia-reperfusion, and provided significant reduction in infarct size (IS/AAR = 14 ± 2% vs control IS/AAR = 48 ± 3%, p < 0.05). Treatment with the ganglionic antagonist, hexamethonium (50 μM), blocked IPC protection (IS/AAR = 37 ± 7%, p < 0...
March 2017: Basic Research in Cardiology
https://www.readbyqxmd.com/read/28079888/antiphospholipid-antibodies-enhance-rat-neonatal-cardiomyocyte-apoptosis-in-an-in-vitro-hypoxia-reoxygenation-injury-model-via-p38-mapk
#3
Lauren T Bourke, Thomas McDonnell, James McCormick, Charis Pericleous, Vera M Ripoll, Ian Giles, Anisur Rahman, Anastasis Stephanou, Yiannis Ioannou
A significant amount of myocardial damage during a myocardial infarction (MI) occurs during the reperfusion stage, termed ischaemia/reperfusion (I/R) injury, and accounts for up to 50% of total infarcted tissue post-MI. During the reperfusion phase, a complex interplay of multiple pathways and mechanisms is activated, which ultimately leads to cell death, primarily through apoptosis. There is some evidence from a lupus mouse model that lupus IgG, specifically the antiphospholipid (aPL) antibody subset, is pathogenic in mesenteric I/R injury...
January 12, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28074482/remote-ischaemic-preconditioning-suppresses-endogenous-plasma-nitrite-during-ischaemia-reperfusion-a-randomised-controlled-crossover-pilot-study
#4
Ashok Nair, Sitara Khan, Sami Omar, Xiao-Qing Pei, Karen McNeill, Phil Chowienczyk, Andrew James Webb
AIM: To test the hypothesis that remote ischaemic preconditioning (RIPC) increases circulating endogenous local and systemic plasma [nitrite] during RIPC and ischaemia-reperfusion (IR) as a potential protective mechanism against ischaemia-reperfusion injury (IRI). METHODS: Six healthy male volunteers (mean age 29.5 ± 7.6 years) were randomised in a cross-over study to initially receive either RIPC (4 x 5 min cycles) to the left arm, or no RIPC (Control), both followed by an ischaemia-reperfusion (IR) sequence (20 min cuff inflation to 200 mmHg, 20 min reperfusion) to the right arm...
January 10, 2017: British Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/28071786/functional-and-cardioprotective-effects-of-simultaneous-and-individual-activation-of-protein-kinase-a-and-epac
#5
Igor Khaliulin, Mark Bond, Andrew F James, Zara Dyar, Raheleh Amini, Jason L Johnson, M-Saadeh Suleiman
BACKGROUND AND PURPOSE: Myocardial cAMP elevation confers cardioprotection against ischaemia/reperfusion (I/R) injury. cAMP activates two independent signalling pathways, PKA and Epac. This study investigated the cardiac effects of activating PKA and/or Epac and their involvement in cardioprotection against I/R. EXPERIMENTAL APPROACH: Hearts extracted from male rats were used either for determination of PKA and PKC activation or perfused in the Langendorff mode for either cardiomyocytes isolation or used to monitor functional activity at basal levels and after 30 min global ischaemia and 2 h reperfusion...
January 10, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28071653/prophylactic-orthosteric-inhibition-of-leukocyte-integrin-cd11b-cd18-prevents-long-term-fibrotic-kidney-failure-in-cynomolgus-monkeys
#6
Abbas Dehnadi, A Benedict Cosimi, Rex Neal Smith, Xiangen Li, José L Alonso, Terry K Means, M Amin Arnaout
Ischaemic acute kidney injury (AKI), an inflammatory disease process, often progresses to chronic kidney disease (CKD), with no available effective prophylaxis. This is in part due to lack of clinically relevant CKD models in non-human primates. Here we demonstrate that inhibition of the archetypal innate immune receptor CD11b/CD18 prevents progression of AKI to CKD in cynomolgus monkeys. Severe ischaemia-reperfusion injury of the right kidney, with subsequent periods of the left ureter ligation, causes irreversible right kidney failure 3, 6 or 9 months after AKI...
January 10, 2017: Nature Communications
https://www.readbyqxmd.com/read/28069702/remote-ischemic-conditioning-provides-humoural-cross-species-cardioprotection-through-glycine-receptor-activation
#7
Juan José Alburquerque-Béjar, Ignasi Barba, Laura Valls-Lacalle, Marisol Ruiz-Meana, Michela Pecoraro, Antonio Rodríguez-Sinovas, David García-Dorado
AIMS: Remote ischaemic conditioning (RIC) releases a humoural factor able to exert cross-species cardioprotection when plasma dialysate is applied to isolated hearts. However, the exact chemical nature of this factor is currently unknown. METHODS AND RESULTS: RIC (4 × 5min femoral occlusion/5min reperfusion) was applied to 10 male pigs, and blood was taken before and after the manoeuvre. Discriminant analysis of (1)H-NMR spectra (n = 10-12) obtained from plasma dialysates (12-14 kDa cut-off) allowed to demonstrate a different metabolic profile between control and postRIC samples, with lactate (2...
January 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/28065445/colin-trial-value-of-colchicine-in-the-treatment-of-patients-with-acute-myocardial-infarction-and-inflammatory-response
#8
Mariama Akodad, Benoît Lattuca, Nicolas Nagot, Vera Georgescu, Mathilde Buisson, Jean-Paul Cristol, Florence Leclercq, Jean-Christophe Macia, Richard Gervasoni, Thien-Tri Cung, Stéphane Cade, Frédéric Cransac, Jessica Labour, Anne-Marie Dupuy, François Roubille
BACKGROUND: Inflammation is involved during acute myocardial infarction, and could be an interesting target to prevent ischaemia-reperfusion injuries. Colchicine, known for its pleiotropic anti-inflammatory effects, could decrease systemic inflammation in this context. AIMS: To evaluate the impact of colchicine on inflammation in patients admitted for ST-segment elevation myocardial infarction (STEMI). METHODS: All patients admitted for STEMI with one of the main coronary arteries occluded, and successfully treated with percutaneous coronary intervention, were included consecutively...
January 3, 2017: Archives of Cardiovascular Diseases
https://www.readbyqxmd.com/read/28042948/bacmam-delivery-of-a-protective-gene-to-reduce-renal-ischemia-reperfusion-injury
#9
Elisabetta Hitchman, Richard Brian Hitchman, Linda A King
Ischaemia-reperfusion (I/R) injury remains the primary contributor to delayed graft function in kidney transplantation. The beneficial application of manganese superoxide dismutase (sod), delivered by a BacMam vector, against renal I/R injury has not been evaluated previously. Therefore, in this study we overexpressed sod-2 in proximal tubular epithelial (HK-2) cells and porcine kidney organs during simulated renal I/R injury. Incubation of HK-2 cells with antimycin A and 2-deoxyglucose resulted in a significant decrease in intracellular ATP levels; following reperfusion, ATP levels significantly increased overtime in cells overexpressing sod-2...
January 2, 2017: Human Gene Therapy
https://www.readbyqxmd.com/read/28033580/extracellular-cl-free-induced-cardioprotection-against-hypoxia-reoxygenation-is-associated-with-attenuation-of-mitochondrial-permeability-transition-pore
#10
Xian-Gui Zhang, Le Zhao, Yi Zhang, Yuan-Yuan Li, Huan Wang, Guang-Ling Duan, Lin Xiao, Xiao-Ran Li, He-Ping Chen
The isotonic substitution of extracellular chloride by gluconate (extracellular Cl(-)-free) has been demonstrated to elicit cardioprotection by attenuating ischaemia/reperfusion-induced elevation of intracellular chloride ion concentration ([Cl(-)]i). However, the downstream mechanism underlying the cardioprotective effect of extracellular Cl(-)-free is not fully established. Here, it was investigated whether extracellular Cl(-)-free attenuates mitochondrial dysfunction after hypoxia/reoxygenation (H/R) and whether mitochondrial permeability transition pore (mPTP) plays a key role in the extracellular Cl(-)-free cardioprotection...
December 26, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28028935/renoprotection-focus-on-trpv1-trpv4-trpc6-and-trpm2
#11
REVIEW
L Markó, M Mannaa, T N Haschler, S Krämer, M Gollasch
Members of the transient receptor potential (TRP) cation channel receptor family have unique sites of regulatory function in the kidney which enables them to promote regional vasodilatation and controlled Ca(2+) influx into podocytes and tubular cells. Activated TRP vanilloid 1 receptor channels (TRPV1) have been found to elicit renoprotection in rodent models of acute kidney injury following ischaemia/reperfusion. Transient receptor potential cation channel, subfamily C, member 6 (TRPC6) in podocytes is involved in chronic proteinuric kidney disease, particularly in focal segmental glomerulosclerosis (FSGS)...
November 7, 2016: Acta Physiologica
https://www.readbyqxmd.com/read/28028069/remote-ischaemic-conditioning-reduces-infarct-size-in-animal-in-vivo-models-of-ischaemia-reperfusion-injury-a-systematic-review-and-meta-analysis
#12
Daniel I Bromage, Jack M J Pickard, Xavier Rossello, Oliver J Ziff, Niall Burke, Derek M Yellon, Sean M Davidson
AIMS: The potential of remote ischaemic conditioning (RIC) to ameliorate myocardial ischaemia-reperfusion injury (IRI) remains controversial. We aimed to analyse the pre-clinical evidence base to ascertain the overall effect and variability of RIC in animal in vivo models of myocardial IRI. Furthermore, we aimed to investigate the impact of different study protocols on the protective utility of RIC in animal models and identify gaps in our understanding of this promising therapeutic strategy...
October 23, 2016: Cardiovascular Research
https://www.readbyqxmd.com/read/28007877/mechanical-reperfusion-with-leucocyte-filtered-blood-does-not-prevent-injury-following-global-cerebral-ischaemia
#13
Rickard P F Lindblom, Thomas Tovedal, Bo Norlin, Lars Hillered, Svetlana N Popova, Irina Alafuzoff, Stefan Thelin
OBJECTIVES: Prolonged global cerebral ischaemia leads to irreversible injury, often with lethal outcome. Brain injuries are partly caused by the uncontrolled reperfusion that occurs once the circulation is re-established. Recent animal experiments suggest that controlled reperfusion following lengthy ischaemia might prevent severe brain injury. This study aimed at further exploring cerebral alterations and outcome following prolonged global cerebral ischaemia and mechanically manipulated reperfusion...
December 22, 2016: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/28006953/lymphocyte-communication-in-myocardial-ischemia-reperfusion-injury
#14
Stephen E Boag, Emanuele Andreano, Ioakim Spyridopoulos
SIGNIFICANCE: Myocardial ischaemia/reperfusion (I/R) is an important complication of reperfusion therapy for myocardial infarction. It is a complex process involving metabolic and immunological factors. To date no effective treatment has been identified. Recent Advances: Previous research has focused on the role of innate immune cells in I/R injury. In recent years increasing evidence has accumulated for an important role for adaptive immune cells, particularly T lymphocytes. Data from ST elevation myocardial infarction (STEMI) patients has identified prognostic significance for lymphocyte counts, particularly post-reperfusion lymphopenia...
December 23, 2016: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/27999072/the-extracellular-isoform-of-superoxide-dismutase-has-a-significant-impact-on-cardiovascular-ischaemia-and-reperfusion-injury-during-cardiopulmonary-bypass
#15
Antonio Pinto, Moritz Benjamin Immohr, Annika Jahn, Alexander Jenke, Udo Boeken, Artur Lichtenberg, Payam Akhyari
OBJECTIVES: Cardiac surgery with cardiopulmonary bypass (CPB) provokes ischaemia and reperfusion injury (IRI). Superoxide is a main mediator of IRI and is detoxified by superoxide dismutases (SODs). Extracellular SOD (SOD3) is the prevailing isoform in the cardiovascular system. Its mutation is associated with elevated risk for ischaemic heart disease as epidemiological and experimental studies suggest. We investigated the influence of SOD3 on IRI in the context of CPB and hypothesized a protective role for this enzyme...
December 2016: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/27998005/sex-differences-in-ischaemia-reperfusion-induced-acute-kidney-injury-depends-on-the-degradation-of-noradrenaline-by-monoamine-oxidase
#16
Ryosuke Tanaka, Maki Yazawa, Yuri Morikawa, Hidenobu Tsutsui, Mamoru Ohkita, Tokihito Yukimura, Yasuo Matsumura
Ischaemic acute kidney injury (AKI) is a leading killer of both sexes; however, resistance to this injury is higher among women than men. We found that renal venous noradrenaline (NAd) overflow after reperfusion played important roles in the development of ischaemic AKI, and that the attenuation of AKI observed in female rats may be dependent on depressing the renal sympathetic nervous system with endogenous oestrogen. In the present study, we used male and female Sprague-Dawley rats to investigate whether sex differences in the pathogenesis of ischaemic AKI are related to the degradation of NAd by monoamine oxidase (MAO) in the kidney...
December 20, 2016: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/27997746/autophagy-an-adaptive-physiological-countermeasure-to-cellular-senescence-and-ischaemia-reperfusion-associated-cardiac-arrhythmias
#17
REVIEW
Istvan Lekli, David Donald Haines, Gyorgy Balla, Arpad Tosaki
Oxidative stress placed on tissues that involved in pathogenesis of a disease activates compensatory metabolic changes, such as DNA damage repair that in turn causes intracellular accumulation of detritus and 'proteotoxic stress', leading to emergence of 'senescent' cellular phenotypes, which express high levels of inflammatory mediators, resulting in degradation of tissue function. Proteotoxic stress resulting from hyperactive inflammation following reperfusion of ischaemic tissue causes accumulation of proteinaceous debris in cells of the heart in ways that cause potentially fatal arrhythmias, in particular ventricular fibrillation (VF)...
December 20, 2016: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/27995262/ethyl-pyruvate-has-anti-apoptotic-and-myocardial-protective-effects-after-regional-ischaemia-reperfusion-myocardial-damage-in-an-in-vivo-rat-model
#18
Haeng Seon Shim, Jeong Heon Park, Yeon A Kim, Jeong Yeol Han, Miyeong Park, Yun Gyu Song, Joon Soo Kim, Il-Woo Shin
INTRODUCTION: The integration of reactive oxygen species is strongly associated with important pathophysiological mechanisms that mediate myocardial ischaemia/reperfusion (I/R) damage. Pyruvate is an efficacious scavenger of reactive oxygen species and a previous study has shown that ethyl pyruvate (EP) has a myocardial protective effect against regional I/R damage in an in vivo rat model. The purpose of this study was to determine whether the myocardial protective effect of EP is associated with anti-apoptosis...
December 20, 2016: Singapore Medical Journal
https://www.readbyqxmd.com/read/27994300/does-remote-ischaemic-preconditioning-protect-kidney-and-cardiomyocytes-after-coronary-revascularization-a-double-blind-controlled-clinical-trial
#19
Seyed Mahmoud Nouraei, Afshin Gholipour Baradari, Asieh Jazayeri
OBJECTIVE: To investigate efficacy of remote ischaemic preconditioning on reducing kidney injury and myocardial damage after coronary artery bypass grafting surgery (CABG). BACKGROUND: Ischaemic preconditioning of a remote organ reduces ischaemia-reperfusion injury of kidney and myocardium after CABG. METHOD: To reduce myocardial damage and kidney injury by applying Remote Ischaemic Preconditioning we recruited 100 consecutive patients undergoing elective coronary artery bypass grafting surgery...
October 2016: Medical Archives
https://www.readbyqxmd.com/read/27983542/pentoxifylline-attenuates-the-local-and%C3%A2-systemic-inflammatory-response-after%C3%A2-infrarenal-abdominal-aortic-ischemia-reperfusion
#20
Tibor Nagy, Péter Hardi, Ildikó Takács, Mónika Tóth, Laura Petrovics, Gábor Jancsó, László Sínay, Gábor Fazekas, Örs Pintér, Endre Arató
AIMS: We studied the new anti-inflammatory effects of non-specific phosphodiesterase (PDE) inhibitor pentoxifylline (PTX) on ischaemia-reperfusion injury and postconditioning of the lower extremities. We aimed to examine the oxidative stress parameters (OSP), the inflammatory response and the changes in structure of skeletal muscle after revascularization surgery. METHODS: 50 Wistar rats in five groups underwent a 60 min infrarenal aortic cross clamping. After the ischaemia in IR+PC group ischemic postconditioning was performed, intermittent 15 seconds reperfusion, 15 seconds ischaemic periods were applied four times...
December 14, 2016: Clinical Hemorheology and Microcirculation
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