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https://www.readbyqxmd.com/read/27913427/intermittent-hypoxia-during-recovery-from-neonatal-hyperoxic-lung-injury-causes-long-term-impairment-of-alveolar-development-a-new-rat-model-of-bpd
#1
Anastasiya Mankouski, Crystal Kantores, Mathew J Wong, Julijana Ivanovska, Amish Jain, Eric J Benner, Stanley N Mason, A Keith Tanswell, Richard L Auten, Robert P Jankov
Bronchopulmonary dysplasia (BPD) is a chronic lung injury characterized by impaired alveologenesis that may persist into adulthood. Rat models of BPD using varying degrees of hyperoxia to produce injury either cause early mortality or spontaneously recover following removal of the inciting stimulus, thus limiting clinical relevance. We sought to refine an established rat model induced by exposure to 60% O2 from birth by following hyperoxia with intermittent hypoxia (IH). Rats exposed from birth to air or 60% O2 until day 14 were recovered in air with or without IH (FiO2 = 0...
December 2, 2016: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/27901396/effects-of-dobutamine-hydrochloride-on-cardiovascular-function-in-horses-anesthetized-with-isoflurane-with-or-without-acepromazine-maleate-premedication
#2
Mara F Schier, Anthea L Raisis, Cristy J Secombe, Giselle Hosgood, Gabrielle C Musk, Guy D Lester
OBJECTIVE To determine the effects of acepromazine maleate premedication on cardiovascular function before and after infusion of dobutamine hydrochloride for 30 minutes in isoflurane-anesthetized horses. ANIMALS 6 healthy adult horses. PROCEDURES Each horse was anesthetized once following premedication with acepromazine (0.02 mg/kg, IV) administered 30 minutes prior to anesthetic induction (ACP+ treatment) and once without premedication (ACP- treatment). Anesthesia was induced with IV administration of xylazine hydrochloride (0...
December 2016: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/27898959/heritabilities-and-genetic-correlations-of-pulmonary-arterial-pressure-and-performance-traits-in-angus-cattle-at-high-altitude
#3
N F Crawford, M G Thomas, T N Holt, S E Speidel, R M Enns
Pulmonary arterial pressure (PAP) is an indicator trait for pulmonary hypertension and for the risk of developing high-altitude disease (HAD) in cattle. Pulmonary arterial pressures provide a tool for selection of breeding cattle for tolerance to high altitude in mountainous regions of the United States. The objective of this study was to evaluate relationships between growth performance traits and yearling PAP (42.4 ± 9.9 mmHg; = 5,776; elevation 2,150 m) using data from 1993 to 2014 in the John E. Rouse Colorado State University Beef Improvement Center (CSU-BIC) Angus herd...
November 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/27898890/postprandial-portal-glucose-and-lactate-fluxes-insulin-production-and-portal-vein-drained-viscera-oxygen-consumption-in-growing-pigs-fed-a-high-fiber-diet-supplemented-with-a-multi-enzyme-cocktail
#4
A K Agyekum, E Kiarie, M C Walsh, C M Nyachoti
Information on effects of supplementing fibrous diets with exogenous enzymes on nutrient absorption and energetic demands of visceral organs is scarce. Therefore, this study investigated the effects of supplementing a high-fiber (HF) diet with a multi-enzyme cocktail (MC) on net glucose and lactate portal fluxes, insulin production, and O consumption by the portal-drained viscera (PDV) and whole animal in growing pigs. The MC supplied (analyzed values) 5,397 U of xylanase, 162 U of β-glucanase, and 2,000 U of protease per kg of diet, and guaranteed minimum activities of 1,000 U of α-amylase and 25 U of pectinase per kg of diet...
September 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/27897352/functional-magnetic-resonance-imaging-for-in-vivo-quantification-of-pulmonary-hypertension-in-the-sugen-5416-hypoxia-mouse
#5
Ellen C Breen, Miriam Scadeng, N Chin Lai, Fiona Murray, Timothy D Bigby
Pulmonary arterial hypertension (PAH) is characterized by elevated pulmonary artery pressures and right heart failure. PAH mouse models are instrumental in understanding disease pathophysiology. However, few methods are available to evaluate right cardiac function in small animals. In this study, magnetic resonance imaging (MRI) was used to measure in vivo cardiac dimensions in the Sugen 5416/hypoxia mouse model. Pulmonary hypertension (PH) was induced in C57BL/6 mice by three weeks of exposure to 10% oxygen and VEGF receptor inhibition (20 mg kg(-1) SU5416)...
November 29, 2016: Experimental Physiology
https://www.readbyqxmd.com/read/27890860/renal-denervation-by-ct-guided-periarterial-injection-of-hyperosmolar-saline-vincristine-paclitaxel-and-guanethidine-in-a-pig-model
#6
Patrick Freyhardt, Ricardo Donners, Alex Riemert, Jörg Schnorr, Nicola Stolzenburg, Jan Leo Rinnenthal, Ulrich Bernhardt, Bernd Hamm, Rolf W Günther, Florian Streitparth
AIMS: To evaluate feasibility, safety and efficacy of renal sympathetic denervation with CT- guided periarterial injection of potentially neurolytic agents in pigs. METHODS AND RESULTS: Unilateral injection of formulations containing either 5 M hyperosmolar saline, vincristine, paclitaxel or guanethidine around the renal artery was performed in 24 normotensive pigs with 6 animals per group. Needle placement and injections were performed under CT-fluoroscopy guidance...
November 29, 2016: EuroIntervention
https://www.readbyqxmd.com/read/27889641/increased-mitochondrial-superoxide-in-the-brain-but-not-periphery-sensitizes-mice-to-angiotensin-ii-mediated-hypertension
#7
Adam J Case, Jun Tian, Matthew C Zimmerman
Angiotensin II (AngII) elicits the production of superoxide (O2(•-)) from mitochondria in numerous cell types within peripheral organs and in the brain suggesting a role for mitochondrial-produced O2(•-) in the pathogenesis of hypertension. However, it remains unclear if mitochondrial O2(•-) is causal in the development of AngII-induced hypertension, or if mitochondrial O2(•-) in the absence of elevated AngII is sufficient to increase blood pressure. Further, the tissue specific (i.e. central versus peripheral) redox regulation of AngII hypertension remains elusive...
November 20, 2016: Redox Biology
https://www.readbyqxmd.com/read/27888135/antihypertensive-effects-of-androgens-in-conscious-spontaneously-hypertensive-rats
#8
Mercedes Perusquía, Nieves Herrera, Mercedes Ferrer, John N Stallone
Androgens are vasoactive steroids that induce acute vasodilation in a number of isolated vascular beds from different species, but the effects of these hormones on systemic blood pressure (BP) have been studied little. Although it has been reported that androgens exert systemic hypotensive effects through peripheral vasodilation in normotensive rats, there have not been any reports of systemic hypotensive effects of androgens in animals with hypertension. This study was designed to evaluate the acute effects of testosterone (TES) and its 5-reduced metabolites on systemic BP in hypertensive rats and to test the hypothesis that hypotestosteronemia may be involved in the pathogenesis of hypertension...
November 23, 2016: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/27884329/saphenous-artery-based-flap-models-in-rats-new-flap-designs-for-experimental-studies
#9
Ersin Aksam, Berrak Aksam, Mustafa Erol Demirseren, Huban Sibel Orhun Yavuz
BACKGROUND: Experimental research using laboratory animals provides substantial data about reconstructive surgery. However, the literature does not include any experimental studies that have used flap models on the hind limbs of rats. To gain an understanding of the physiology of lower-extremity flaps and of flap failures, this study assessed the cutaneous perforators of the saphenous artery, and new flap models were designed for the hind limbs of rats. MATERIALS AND METHODS: The experiment was designed to include three stages and used 35 rats...
December 2016: Journal of Surgical Research
https://www.readbyqxmd.com/read/27884326/appropriate-timing-of-blood-sampling-for-blood-gas-analysis-in-the-ventilated-rabbit
#10
Kiguna Sei, Masanori Fujita, Shinpei Okawa, Takeshi Hirasawa, Toshihiro Kushibiki, Hidenori Sasa, Kenichi Furuya, Miya Ishihara
BACKGROUND: Arterial and venous blood gas analyses (BGAs) are essential to evaluate devices that measure biological oxygenation. The appropriate timing of blood sampling for BGA after respiratory rate (RR) change in animal experiments has not been reported. This study investigated the appropriate timing of blood sampling for BGA in ventilated rabbits and whether venous samples are an alternative to arterial samples. MATERIALS AND METHODS: Under general anesthesia, 14 rabbits (body weight, 3...
December 2016: Journal of Surgical Research
https://www.readbyqxmd.com/read/27882326/ventricular-fibrillation-induced-cardiac-arrest-results-in-regional-cardiac-injury-preferentially-in-left-anterior-descending-coronary-artery-territory-in-piglet-model
#11
Giridhar Kaliki Venkata, John R Forder, Dan Clark, Andre Shih, Sharda Udassi, Srinivasarao Badugu, Melissa A Lamb, Stacy L Porvasnik, Renata S Shih, Dalia Colon-Lopez, Arno L Zaritsky, Ikram U Haque, Jai P Udassi
Objective. Decreased cardiac function after resuscitation from cardiac arrest (CA) results from global ischemia of the myocardium. In the evolution of postarrest myocardial dysfunction, preferential involvement of any coronary arterial territory is not known. We hypothesized that there is no preferential involvement of any coronary artery during electrical induced ventricular fibrillation (VF) in piglet model. Design. Prospective, randomized controlled study. Methods. 12 piglets were randomized to baseline and electrical induced VF...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27881559/safety-and-tolerability-of-csl112-a-reconstituted-infusible-plasma-derived-apolipoprotein-a-i-after-acute-myocardial-infarction-the-aegis-i-trial-apoa-i-event-reducing-in-ischemic-syndromes-i
#12
C Michael Gibson, Serge Korjian, Pierluigi Tricoci, Yazan Daaboul, Megan Yee, Purva Jain, John H Alexander, P Gabriel Steg, A Michael Lincoff, John J P Kastelein, Roxana Mehran, Denise M D'Andrea, Lawrence I Deckelbaum, Bela Merkely, Maciej Zarebinski, Ton Oude Ophuis, Robert A Harrington
BACKGROUND: -Human or recombinant apolipoprotein A-I (apoA-I) has been shown to increase high-density lipoprotein-mediated cholesterol efflux capacity and to regress atherosclerotic disease in animal and clinical studies. CSL112 is an infusible, plasma-derived apoA-I that has been studied in normal subjects or those with stable coronary artery disease. This study aimed to characterize the safety, tolerability, pharmacokinetics, and pharmacodynamics of CSL112 in patients with a recent acute myocardial infarction...
November 15, 2016: Circulation
https://www.readbyqxmd.com/read/27875385/effects-of-linagliptin-on-vessel-wall-healing-in-the-rat-model-of-arterial-injury-under-normal-and-diabetic-conditions
#13
Linnea Eriksson, Samuel Röhl, Robert Saxelin, Mariette Lengquist, Malin Kronqvist, Kenneth Caidahl, Claes-Göran Östenson, Anton Razuvaev
Diabetic patients suffer an increased risk of restenosis and late stent thrombosis after angioplasty, complications that are related to a defective re-endothelialization. Dipeptidyl peptidase-4 inhibitors have been suggested to exert direct effect on endothelial and smooth muscle cells (SMCs). Therefore the objective was to study if the dipeptidyl peptidase-4 inhibitor linagliptin could influence vascular repair and accelerate re-endothelialization after arterial injury in healthy and diabetic animals. Diabetic Goto-Kakizaki and healthy Wistar rats were subjected to arterial injury and treated with linagliptin or vehicle...
November 17, 2016: Journal of Cardiovascular Pharmacology
https://www.readbyqxmd.com/read/27870736/lidocaine-administration-controls-micrornas-alterations-observed-after-lung-ischemia-reperfusion-injury
#14
Lisa Rancan, Carlos Simón, Emmeline Marchal-Duval, Javier Casanova, Sergio Damian Paredes, Alberto Calvo, Cruz García, David Rincón, Agustín Turrero, Ignacio Garutti, Elena Vara
BACKGROUND: Ischemia-reperfusion injury (IRI) is associated with morbidity and mortality. MicroRNAs (miRNAs) have emerged as regulators of IRI, and they are involved in the pathogenesis of organ rejection. Lidocaine has proven anti-inflammatory activity in several tissues but its modulation of miRNAs has not been investigated. This work aims to investigate the involvement of miRNAs in lung IRI in a lung auto-transplantation model and to investigate the effect of lidocaine. METHODS: Three groups (sham, control, and Lidocaine), each comprising 6 pigs, underwent a lung autotransplantation...
December 2016: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/27867361/calcium-sensing-receptor-regulates-cytosolic-ca-2-and-plays-a-major-role-in-the-development-of-pulmonary-hypertension
#15
REVIEW
Kimberly A Smith, Ramon J Ayon, Haiyang Tang, Ayako Makino, Jason X-J Yuan
Pulmonary arterial hypertension (PAH) is a progressive disease characterized by elevated pulmonary vascular resistance (PVR) leading to right heart failure and premature death. The increased PVR results in part from pulmonary vascular remodeling and sustained pulmonary vasoconstriction. Excessive pulmonary vascular remodeling stems from increased pulmonary arterial smooth muscle cell (PASMC) proliferation and decreased PASMC apoptosis. A rise in cytosolic free Ca(2+) concentration ([Ca(2+)]cyt) in PASMC is a major trigger for pulmonary vasoconstriction and a key stimulus for PASMC proliferation and migration, both contributing to the development of pulmonary vascular remodeling...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27864477/is-visceral-flow-during-intra-aortic-balloon-pumping-size-or-volume-dependent
#16
Sandro Gelsomino, Pieter W J Lozekoot, Monique M J de Jong, Fabiana Lucà, Orlando Parise, Francesco Matteucci, Mario Romano, Abdullrazak Hossien, Mark La Meir, Niccolò Marchionni, Jos G Maessen, Roberto Lorusso
AIM: We evaluated the influence of intra-aortic balloon size and volume on mesenteric and renal flows. METHODS: Thirty healthy swine underwent 120-minute ligation of the left anterior descending coronary artery followed by 6 hours of reperfusion. Then, they were randomly assigned to the following five groups of animals, with six animals in each group: no intra-aortic balloon pump (IABP), a short 35-mL IABP, a short 40-mL IABP, a long 35-mL IABP and a long 40-mL IABP...
November 17, 2016: Perfusion
https://www.readbyqxmd.com/read/27863840/long-term-pre-treatment-of-antioxidant-ginkgo-biloba-extract-egb-761-attenuates-cerebral-ischemia-induced-neuronal-damage-in-aged-mice
#17
Xiaomei Zhou, Yinliang Qi, Ting Chen
Antioxidant activity has been attributed to the neuroprotective effects of Ginkgo biloba extract EGb-761 on brain disorders including ischemic stroke. It is suggested that oxidative stress implicates in neuron injuries during aging. However, whether or not EGb-761 could be used to treat age-related cerebral ischemia is unclear. In the present study, we directly studied the protective effects of EGb-761 in brain ischemia in the mice with different age. As expected, the recovery from brain damages was impaired in aged mice (24 months) in an animal model of middle cerebral artery occlusion (MCAO)...
November 15, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/27857746/protective-effects-of-carnosine-on-white-matter-damage-induced-by-chronic-cerebral-hypoperfusion
#18
Jing Ma, Shu-Hong Bo, Xiao-Tong Lu, A-Jing Xu, Jian Zhang
Carnosine is a dipeptide that scavenges free radicals, inhibits inflammation in the central nervous system, and protects against ischemic and hypoxic brain damage through its anti-oxidative and anti-apoptotic actions. Therefore, we hypothesized that carnosine would also protect against white matter damage caused by subcortical ischemic injury. White matter damage was induced by right unilateral common carotid artery occlusion in mice. The animals were treated with 200, 500 or 750 mg/kg carnosine by intraperitoneal injection 30 minutes before injury and every other day after injury...
September 2016: Neural Regeneration Research
https://www.readbyqxmd.com/read/27856285/neurotrophic-and-neuroprotective-effects-of-oxyntomodulin-in-neuronal-cells-and-a-rat-model-of-stroke
#19
Yazhou Li, Kou-Jen Wu, Seong-Jin Yu, Ian A Tamargo, Yun Wang, Nigel H Greig
Proglucagon-derived peptides, especially glucagon-like peptide-1 (GLP-1) and its long-acting mimetics, have exhibited neuroprotective effects in animal models of stroke. Several of these peptides are in clinical trials for stroke. Oxyntomodulin (OXM) is a proglucagon-derived peptide that co-activates the GLP-1 receptor (GLP-1R) and the glucagon receptor (GCGR). The neuroprotective action of OXM, however, has not been thoroughly investigated. In this study, the neuroprotective effect of OXM was first examined in human neuroblastoma (SH-SY5Y) cells and rat primary cortical neurons...
November 14, 2016: Experimental Neurology
https://www.readbyqxmd.com/read/27849565/association-between-long-term-blood-pressure-variability-and-10-year-progression-in-arterial-stiffness-the-multiethnic-study-of-atherosclerosis
#20
Yacob G Tedla, Yuichiro Yano, Mercedes Carnethon, Philip Greenland
Experimental studies conducted on animal and human endothelium suggested that higher systolic blood pressure (SBP) variability reduces bioavailability of nitric oxide and increases vascular smooth muscle cell proliferation. These vascular wall changes could stiffen the arterial wall. Using data from the Multiethnic Study of Atherosclerosis, we investigated the association between long-term SBP variability and 10-year percent change in arterial stiffness among 1122 individuals (mean age 57 years, 46% males at baseline) who were not taking antihypertensive medications...
November 14, 2016: Hypertension
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