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Preconditioning

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https://www.readbyqxmd.com/read/28810549/dexmedetomidine-preconditioning-protects-against-lung-injury-induced-by-ischemia-reperfusion-through-inhibition-of-autophagy
#1
Wei Zhang, Jiaqiang Zhang
The present study aimed to evaluate the role of autophagy in the protective effect of dexmedetomidine in lung injury caused by ischemia-reperfusion (IR) in rats. In total 48 adult male Sprague-Dawley rats were randomly divided into 6 groups (n=8) as follows: i) Sham group; ii) the IR group; iii) IR + 1 µg/kg dexmedetomidine preconditioning group (pre-LD); iv) IR + 10 µg/kg dexmedetomidine preconditioning group (pre-HD); v) IR + 1 µg/kg dexmedetomidine postconditioning group (post-LD); and vi) IR + 10 µg/kg dexmedetomidine postconditioning group (post-HD)...
August 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28809715/prescribed-performance-control-of-uncertain-euler-lagrange-systems-subject-to-full-state-constraints
#2
Kai Zhao, Yongduan Song, Tiedong Ma, Liu He
This paper studies the zero-error tracking control problem of Euler-Lagrange systems subject to full-state constraints and nonparametric uncertainties. By blending an error transformation with barrier Lyapunov function, a neural adaptive tracking control scheme is developed, resulting in a solution with several salient features: 1) the control action is continuous and C¹ smooth; 2) the full-state tracking error converges to a prescribed compact set around origin within a given finite time at a controllable rate of convergence that can be uniformly prespecified; 3) with Nussbaum gain in the loop, the tracking error further shrinks to zero as t→∞; and 4) the neural network (NN) unit can be safely included in the loop during the entire system operational envelope without the danger of violating the compact set precondition imposed on the NN training inputs...
August 11, 2017: IEEE Transactions on Neural Networks and Learning Systems
https://www.readbyqxmd.com/read/28808225/congestive-preconditioning-by-portal-venous-clamping-a-novel-preventive-concept-for-small-intestinal-congestive-re-outflow-injury
#3
Hironori Hayashi, Hiroyuki Takamura, Ryosuke Gabata, Yoshinao Ohbatake, Shinichi Nakanuma, Tomoharu Miyashita, Hidehiro Tajima, Itasu Ninomiya, Sachio Fushida, Tetsuo Ohta
BACKGROUND Congestion of the small intestine, which induces mucosal damage via apoptosis, is a common pathophysiological change in hepato-biliary-pancreatic surgery, including liver transplantation. Small intestinal mucosal damage can trigger postoperative complications via various pathways. Therefore, we investigated the efficacy of intermittent portal venous clamping, which we named congestive preconditioning (CPC), for decreasing congestive re-outflow injury (CRoI) of the small intestine. MATERIAL AND METHODS Small intestinal CRoI was induced in rats by clamping the portal vein (PV) for 30 min, followed by re-outflow...
August 15, 2017: Annals of Transplantation: Quarterly of the Polish Transplantation Society
https://www.readbyqxmd.com/read/28805439/ratios-and-effect-size
#4
Jasper Robinson
Responding to a related pair of measurements is often expressed as a single discrimination ratio. Authors have used various discrimination ratios; yet, little information exists to guide their choice. A second use of ratios is to correct for the influence of a nuisance variable on the measurement of interest. I examine 4 discrimination ratios using simulated data sets. Three ratios, of the form a/(a + b), b/(a + b), and (a - b)/(a + b), introduced distortions to their raw data. The fourth ratio, (b - a)/b largely avoided such distortions and was the most sensitive at detecting statistical differences...
August 14, 2017: Journal of Experimental Psychology. Animal Learning and Cognition
https://www.readbyqxmd.com/read/28804462/heat-acclimation-mediated-cross-tolerance-origins-in-within-life-epigenetics
#5
REVIEW
Michal Horowitz
The primary outcome of heat acclimation is increased thermotolerance, which stems from enhancement of innate cytoprotective pathways. These pathways produce "ON CALL" molecules that can combat stressors to which the body has never been exposed, via cross-tolerance mechanisms (heat acclimation-mediated cross-tolerance-HACT). The foundation of HACT lies in the sharing of generic stress signaling, combined with tissue/organ- specific protective responses. HACT becomes apparent when acclimatory homeostasis is achieved, lasts for several weeks, and has a memory...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28802596/effects-of-differential-phase-remote-ischemic-preconditioning-intervention-in-laparoscopic-partial-nephrectomy-a-single-blinded-randomized-controlled-trial-in-a-parallel-group-design
#6
Yuan-Yuan Hou, Yun Li, Shu-Fang He, Jie Song, De-Xin Yu, Gordon T C Wong, Ye Zhang
STUDY OBJECTIVE: There are two windows of protection for remote ischemic preconditioning (RIPC), an early (ERIPC) and a late-phase (LRIPC). While ERIPC has been well studied, works on LRIPC are relatively scarce, especially for the kidneys. We aimed to compare the effects of early-phase versus late-phase RIPC in patients with laparoscopic partial nephrectomy (LPN). DESIGN: A randomized controlled study SETTING: The Second Affiliated Hospital of Anhui Medical University, 1 May 2012 to 30 October 2013 PATIENTS: Sixty-five ASA 1 to 2 patients scheduled for LPN were located randomly to ERIPC group, LRIPC group and CON group (control)...
September 2017: Journal of Clinical Anesthesia
https://www.readbyqxmd.com/read/28799202/immune-tolerance-induced-by%C3%A2-platelet-targeted-factor-viii-gene-therapy-in-hemophilia-a-mice-is-cd4%C3%A2-t-cell-mediated
#7
Y Chen, X Luo, J A Schroeder, J Chen, C K Baumgartner, J Hu, Q Shi
BACKGROUND: Immune responses are a major concern in gene therapy. Our previous studies demonstrated that platelet-targeted FVIII (2bF8) gene therapy together with in vivo drug-selection of transduced cells can rescue the bleeding diathesis and induce immune tolerance in FVIII(null) mice. OBJECTIVE: To investigate whether non-selectable 2bF8 lentiviral vector (LV) for the induction of platelet-FVIII expression is sufficient to induce immune tolerance and how immune tolerance is induced after 2bF8LV gene therapy...
August 11, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/28798201/remote-ischemic-preconditioning-does-not-prevent-acute-mountain-sickness-after-rapid-ascent-to-3450-m
#8
Marc M Berger, Franziska Macholz, Lukas Lehmann, Daniel Dankl, Marcel Hochreiter, Bernhard Bacher, Peter Bärtsch, Heimo Mairbäurl
Remote ischemic preconditioning (RIPC) has been shown to protect remote organs, such as the brain and the lung, from damage induced by subsequent hypoxia or ischemia. Acute mountain sickness (AMS) is a syndrome of non-specific neurologic symptoms and in high altitude pulmonary edema excessive hypoxic pulmonary vasoconstriction (HPV) plays a pivotal role. We hypothesized that RIPC protects the brain from AMS and attenuates the magnitude of HPV after rapid ascent to 3450 m. Forty non-acclimatized volunteers were randomized into 2 groups...
August 10, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28794502/proteomics-phosphoproteomics-of-left-ventricular-biopsies-from-patients-with-surgical-coronary-revascularization-and-pigs-with-coronary-occlusion-reperfusion-remote-ischemic-preconditioning
#9
Nilgün Gedik, Marcus Krüger, Matthias Thielmann, Eva Kottenberg, Andreas Skyschally, Ulrich H Frey, Elke Cario, Jürgen Peters, Heinz Jakob, Gerd Heusch, Petra Kleinbongard
Remote ischemic preconditioning (RIPC) by repeated brief cycles of limb ischemia/reperfusion reduces myocardial ischemia/reperfusion injury. In left ventricular (LV) biopsies from patients undergoing coronary artery bypass grafting (CABG), only the activation of signal transducer and activator of transcription 5 was associated with RIPC's cardioprotection. We have now used an unbiased, non-hypothesis-driven proteomics and phosphoproteomics approach to analyze LV biopsies from patients undergoing CABG and from pigs undergoing coronary occlusion/reperfusion without (sham) and with RIPC...
August 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28794136/neutrophil-gelatinase-associated-lipocalin-prior-to-cardiac-surgery-predicts-acute-kidney-injury-and-mortality
#10
Heerajnarain Bulluck, Raju Maiti, Bibhas Chakraborty, Luciano Candilio, Tim Clayton, Richard Evans, David P Jenkins, Shyam Kolvekar, Gudrun Kunst, Christopher Laing, Jennifer Nicholas, John Pepper, Derek M Yellon, Derek J Hausenloy
OBJECTIVE: We aimed to investigate whether preoperative serum neutrophil gelatinase-associated lipocalin (sNGALpre-op) predicted postoperative acute kidney injury (AKI) during hospitalisation and 1-year cardiovascular and all-cause mortality following adult cardiac surgery. METHODS: This study was a post hoc analysis of the Effect of Remote Ischemic Preconditioning on Clinical Outcomes in Patient Undergoing Coronary Artery Bypass Graft Surgery trial involving adult patients undergoing coronary artery bypass graft...
August 9, 2017: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/28793823/role-of-atp-sensitive-potassium-channels-in-remote-ischemic-preconditioning-induced-tissue-protection
#11
Sapna Aggarwal, Puneet Kaur Randhawa, Nirmal Singh, Amteshwar Singh Jaggi
Remote ischemic preconditioning (RIPC) is an innovative treatment strategy that alleviates ischemia-reperfusion injury, whereby short episodes of regional ischemia and reperfusion delivered to remote organs including hind limb, kidney and intestine, and so on provide protection to the heart. The RIPC is known to reduce infarct size, serum levels of cardiac enzymes, and myocardial dysfunction in various animal species as well as in patients. There have been a large number of studies suggesting that the ATP-sensitive potassium channels (KATP channel) play a significant role as a mediator or end effector in RIPC...
September 2017: Journal of Cardiovascular Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/28793040/the-role-of-ischemic-preconditioning-and-pentoxifylline-in-intestinal-ischemia-reperfusion-injury-of-rats
#12
Teresinha Regina Ribeiro de Oliveira, Geraldo Ferreira de Oliveira, Ricardo Santos Simões, Eduardo Hiroshi Tikazawa, Hugo Pequeno Monteiro, Djalma José Fagundes, Murched Omar Taha
Purpose: To investigate the role of ischemic preconditioning (IPC) and pentoxifylline (PTX) in intestinal mucosa ischemia/reperfusion injury (IR). Methods: Thirty rats were assigned to 5 groups (N=6): (CG): no clamping of the superior mesenteric artery (90 min.); (IR-SS): saline + ischemia (30 min.) + reperfusion (60 min.); (IR-PTX): PTX + ischemia (30min.) + reperfusion (60 min.); (IPC-IR-SS): 5 min. of ischemia + 5 minutes of reperfusion (IPC) + saline + ischemia (30 min...
July 2017: Acta Cirúrgica Brasileira
https://www.readbyqxmd.com/read/28793039/low-energy-shock-wave-preconditioning-reduces-renal-ischemic-reperfusion-injury-caused-by-renal-artery-occlusion
#13
Yuquan Xue, Zhibin Xu, Haiwen Chen, Weimin Gan, Tie Chong
Purpose: To evaluate whether low energy shock wave preconditioning could reduce renal ischemic reperfusion injury caused by renal artery occlusion. Methods: The right kidneys of 64 male Sprague Dawley rats were removed to establish an isolated kidney model. The rats were then divided into four treatment groups: Group 1 was the sham treatment group; Group 2, received only low-energy (12 kv, 1 Hz, 200 times) shock wave preconditioning; Group 3 received the same low-energy shock wave preconditioning as Group 2, and then the left renal artery was occluded for 45 minutes; and Group 4 had the left renal artery occluded for 45 minutes...
July 2017: Acta Cirúrgica Brasileira
https://www.readbyqxmd.com/read/28791658/transfer-of-discriminative-control-during-stimulus-fading-conducted-without-reinforcement
#14
Lanny Fields
Using trial-and-error training, eight pigeons did not learn to discriminate between 45° and 135° lines, but did learn to discriminate between red and green colors. Control by line tilt was induced by stimulus fading that did not include reinforcement while fading out the colors. After establishing the red-green discrimination, low-intensity lines were superimposed on colors and were gradually faded in. All of this was done using reinforcement. At the end of the line fade-in, the lines had not acquired control of responding...
August 8, 2017: Learning & Behavior
https://www.readbyqxmd.com/read/28791009/preconditioning-with-lipopolysaccharide-or-lipoteichoic-acid-protects-against-staphylococcus-aureus-mammary-infection-in-mice
#15
Koen Breyne, Jonas Steenbrugge, Kristel Demeyere, Tom Vanden Berghe, Evelyne Meyer
Staphylococcus aureus is one of the most causative agents of mastitis and is associated with chronic udder infections. The persistency of the pathogen is believed to be the result of an insufficient triggering of local inflammatory signaling. In this study, the preclinical mastitis model was used, aiming to evaluate if lipopolysaccharide (LPS) or lipoteichoic acid (LTA) preconditioning could aid the host in more effectively clearing or at least limiting a subsequent S. aureus infection. A prototypic Gram-negative virulence factor, i...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28790886/molecular-bases-of-brain-preconditioning
#16
Oleg G Deryagin, Svetlana A Gavrilova, Khalil L Gainutdinov, Anna V Golubeva, Vyatcheslav V Andrianov, Guzel G Yafarova, Sergey V Buravkov, Vladimir B Koshelev
Preconditioning of the brain induces tolerance to the damaging effects of ischemia and prevents cell death in ischemic penumbra. The development of this phenomenon is mediated by mitochondrial adenosine triphosphate-sensitive potassium ([Formula: see text]) channels and nitric oxide signaling (NO). The aim of this study was to investigate the dynamics of molecular changes in mitochondria after ischemic preconditioning (IP) and the effect of pharmacological preconditioning (PhP) with the [Formula: see text]-channels opener diazoxide on NO levels after ischemic stroke in rats...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28782933/new-insights-into-antibiofilm-effect-of-a-nano-sized-zno-coating-against-the-pathogenic-methicillin-resistant-staphylococcus-aureus
#17
Marta M Alves, Ons Bouchami, Ana Tavares, Laura Córdoba, Catarina Ferreira Santos, Maria Miragaia, Maria de Fatima Montemor
ZnO nanoparticles (NPs) are arising as promising novel antibiotics towards device-related infections. The surface functionalization of Zn, a novel resorbable biomaterial, with ZnO NPs could present an effective solution to overcome such threat. In this sense, the antibacterial and antibiofilm activity of nano and micro-sized ZnO coatings was studied against clinically relevant bacteria - methicillin resistant Staphylococcus aureus (MRSA). The bacterial viability of planktonic and biofilm cells together with the corresponding biofilms structures revealed that only the nano-sized ZnO coating had an antibiofilm effect...
August 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28780500/perinatal-risk-factors-for-neonatal-encephalopathy-an-unmatched-case-control-study
#18
Cally J Tann, Margaret Nakakeeto, Barbara A Willey, Margaret Sewegaba, Emily L Webb, Ibby Oke, Emmanuel Derek Mutuuza, Donald Peebles, Margaret Musoke, Kathryn A Harris, Neil J Sebire, Nigel Klein, Jennifer J Kurinczuk, Alison M Elliott, Nicola J Robertson
OBJECTIVE: Neonatal encephalopathy (NE) is the third leading cause of child mortality. Preclinical studies suggest infection and inflammation can sensitise or precondition the newborn brain to injury. This study examined perinatal risks factor for NE in Uganda. DESIGN: Unmatched case-control study. SETTING: Mulago National Referral Hospital, Kampala, Uganda. METHODS: 210 term infants with NE and 409 unaffected term infants as controls were recruited over 13 months...
August 5, 2017: Archives of Disease in Childhood. Fetal and Neonatal Edition
https://www.readbyqxmd.com/read/28774345/determination-of-optimized-oxygen-partial-pressure-to-maximize-the-liver-regenerative-potential-of-the-secretome-obtained-from-adipose-derived-stem-cells
#19
Sang Chul Lee, Kee-Hwan Kim, Ok-Hee Kim, Sang Kuon Lee, Ha-Eun Hong, Seong Su Won, Sang-Jin Jeon, Byung Jo Choi, Wonjun Jeong, Say-June Kim
BACKGROUND: A hypoxic-preconditioned secretome from stem cells reportedly promotes the functional and regenerative capacity of the liver more effectively than a control secretome. However, the optimum oxygen partial pressure (pO2) in the cell culture system that maximizes the therapeutic potential of the secretome has not yet been determined. METHODS: We first determined the cellular alterations in adipose tissue-derived stem cells (ASCs) cultured under different pO2 (21%, 10%, 5%, and 1%)...
August 3, 2017: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28772486/study-of-the-molecular-dynamics-of-multiarm-star-polymers-with-a-poly-ethyleneimine-core-and-poly-lactide-multiarms
#20
Frida Román, Pere Colomer, Yolanda Calventus, John M Hutchinson
Multiarm star polymers, denoted PEIx-PLAy and containing a hyperbranched poly(ethyleneimine) (PEI) core of different molecular weights x and poly(lactide) (PLA) arms with y ratio of lactide repeat units to N links were used in this work. Samples were preconditioned to remove the moisture content and then characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and dielectric relaxation spectroscopy (DRS). The glass transition temperature, Tg, is between 48 and 50 °C for all the PEIx-PLAy samples...
February 4, 2017: Materials
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