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https://www.readbyqxmd.com/read/29229555/reduced-cerebrovascular-reactivity-and-increased-resting-cerebral-perfusion-in-rats-exposed-to-a-cafeteria-diet
#1
Mariana Gomez-Smith, Rafal Janik, Evelyn M Lake, Lynsie A M Thomason, Conner Adams, Matthew S Jeffers, Bojana Stefanovic, Dale Corbett
To better understand the effects of a diet high in fat, sugar, and sodium on cerebrovascular function, Sprague Dawley rats were chronically exposed to a Cafeteria diet. Resting cerebral perfusion and cerebrovascular reactivity were quantified using continuous arterial spin labeling (CASL) magnetic resonance imaging (MRI). In addition, structural changes to the cerebrovasculature and susceptibility to ischemic lesion were examined. Compared to control animals fed standard chow (SD), Cafeteria diet (CAF) rats exhibited increased resting brain perfusion in the hippocampus and reduced cerebrovascular reactivity in response to 10% inspired CO2 challenges in both the hippocampus and the neocortex...
December 8, 2017: Neuroscience
https://www.readbyqxmd.com/read/29229321/the-role-of-aspirin-heparin-and-other-interventions-in-the-prevention-and-treatment-of-fetal-growth-restriction
#2
REVIEW
Katie M Groom, Anna L David
Fetal growth restriction and related placental pathologies such as preeclampsia, stillbirth, and placental abruption are believed to arise in early pregnancy when inadequate remodeling of the maternal spiral arteries leads to persistent high-resistance and low-flow uteroplacental circulation. The consequent placental ischaemia, reperfusion injury, and oxidative stress are associated with an imbalance in angiogenic/antiangiogenic factors. Many interventions have centered on the prevention and/or treatment of preeclampsia with results pertaining to fetal growth restriction and small-for-gestational-age pregnancy often included as secondary outcomes because of the common pathophysiology...
December 8, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/29228803/in-vitro-human-placental-studies-to-support-an-adenovirus-mediated-vegf-d%C3%AE-n%C3%AE-c-maternal-gene-therapy-for-the-treatment-of-severe-early-onset-fetal-growth-restriction
#3
Michelle Desforges, Alexandra Rogue Rogue, Nick Pearson, Carlo Rossi, Elena Olearo, Roy Forster, Mark Lees, Neil Sebire, Susan Greenwood, Colin Sibley, Anna L David, Paul Brownbill
Severe fetal growth restriction (FGR) affects 1:500 pregnancies, is untreatable and causes serious neonatal morbidity and death. Reduced uterine blood flow (UBF) is one cause. Transduction of uterine arteries in normal and FGR animal models using an adenovirus (Ad) encoding VEGF isoforms, increases UBF and improves fetal growth in utero. Understanding potential adverse consequences of this therapy before first-in-woman clinical application is essential. OBJECTIVE: To determine whether Ad...
December 11, 2017: Human Gene Therapy. Clinical Development
https://www.readbyqxmd.com/read/29223865/prevention-of-ischemia-induced-hearing-loss-by-intravenous-administration-of-hydrogen-rich-saline-in-gerbil
#4
Hideo Ogawa, Masahiro Okada, Masachika Shudou, Kiyofumi Gyo, Naohito Hatoa
OBJECTIVE: Hydrogen-rich water, which is a potent antioxidant agent, was investigated for its protective effects against ischemic damage of the cochlea in gerbils. METHODS: The animals were subjected to transient cochlear ischemia by occluding the bilateral vertebral arteries for l5minutes. Five milliliters of hydrogen-rich saline was then intravenously administered immediately after the insult. Saline without hydrogen was used as a control. Effects of hydrogen were evaluated using the auditory brainstem response (ABR) and histological studies of the inner ear...
December 6, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/29222024/continuous-and-not-continuous-2-week-treadmill-training-enhances-the-performance-in-the-passive-avoidance-test-in-ischemic-gerbils
#5
Ana Paula Cassiano Silveira, Takae Tamy Kitabatake, Vivian Mozol Pantaleo, Hélio Zangrossi, Guilherme Bertolino, Elaine Caldeira de Oliveira Guirro, Hugo Celso Dutra de Souza, João Eduardo de Araujo
This study aims to investigate the frequency and total duration effects of the 2-week treadmill training after experimental ischemic stroke in the passive avoidance test. We performed bilateral occlusion of common external carotid arteries, for five minutes, in Mongolian gerbils. The training groups were: continuous training for twelve consecutive days or not continuous training for six non-consecutive days. The groups remained in the treadmill for 15min, with the speed set at 10m/min, and the training started 24h after the stroke...
December 6, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/29220414/detection-of-spontaneous-pulse-using-the-acceleration-signals-acquired-from-cpr-feedback-sensor-in-a-porcine-model-of-cardiac-arrest
#6
Liang Wei, Gang Chen, Zhengfei Yang, Tao Yu, Weilun Quan, Yongqin Li
BACKGROUND: Reliable detection of return of spontaneous circulation with minimal interruptions of chest compressions is part of high-quality cardiopulmonary resuscitation (CPR) and routinely done by checking pulsation of carotid arteries. However, manual palpation was time-consuming and unreliable even if performed by expert clinicians. Therefore, automated accurate pulse detection with minimal interruptions of chest compression is highly desirable during cardiac arrest especially in out-of-hospital settings...
2017: PloS One
https://www.readbyqxmd.com/read/29216423/nanoparticle-functionalization-with-platelet-membrane-enables-multi-factored-biological-targeting-and-detection-of-atherosclerosis
#7
Xiaoli Wei, Man Ying, Diana Dehaini, Yuanyuan Su, Ashley V Kroll, Jiarong Zhou, Weiwei Gao, Ronnie H Fang, Shu Chien, Liangfang Zhang
Cardiovascular disease represents one of the major causes of death across the global population. Atherosclerosis, one of its most common drivers, is characterized by the gradual build-up of arterial plaque over time, which can ultimately lead to life-threatening conditions. Given the impact of the disease on public health, there is a great need for effective and noninvasive imaging modalities that can provide valuable information on its biological underpinnings during development. Here, we leverage the role of platelets in atherogenesis to design nanocarriers capable of targeting multiple biological elements relevant to plaque development...
December 7, 2017: ACS Nano
https://www.readbyqxmd.com/read/29215465/expression-of-tissue-inhibitor-of-metalloproteinases-and-matrix-metalloproteinases-in-the-ischemic-brain-of-photothrombosis-model-mice
#8
Junsuke Hirono, Haruka Sanaki, Kana Kitada, Haruka Sada, Atsushi Suzuki, Laurensius K Lie, Eri Segi-Nishida, Kimie Nakagawa, Hiroshi Hasegawa
Middle cerebral artery occlusion (MCAO) is the most widely used animal model of ischemic stroke. This model well recapitulates the pathological features of most human cases; however, MCAO is technically difficult to achieve in mice and has some disadvantages for investigating the molecular mechanisms of pathological progression in stroke. The recently developed photothrombosis model may be more suitable for research on the molecular mechanisms of ischemic stroke in mice. Yet, similarities and differences between the photothrombosis and MCAO models are not well characterized...
December 5, 2017: Neuroreport
https://www.readbyqxmd.com/read/29214400/vasomodulatory-effects-of-the-angiotensin-ii-type-1-receptor-antagonist-losartan-on-experimentally-induced-cerebral-vasospasm-after-subarachnoid-haemorrhage
#9
Stefan Wanderer, Jan Mrosek, Gessler Florian, Seifert Volker, Juergen Konczalla
BACKGROUND: Cerebral vasospasm following subarachnoid haemorrhage (SAH) remains one of the major factors contributing to poor overall patient outcome. Prostaglandin F2-alpha (PGF2a) induces vasoconstriction. After SAH, PGF2a leads to cerebral inflammation and enhanced vasoconstriction, resulting in cerebral vasospasm. Losartan is already known to have beneficial effects in stroke models and also on several cerebral inflammatory processes. Therefore, the aim of the study was to analyse the effect of losartan on PGF2a-enhanced vasoconstriction after SAH...
December 6, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/29212800/extracellular-retention-of-pdgf-b-directs-vascular-remodeling-in-mouse-hypoxia-induced-pulmonary-hypertension
#10
Philip Tannenberg, Ya-Ting Chang, Lars Muhl, Bàrbara Laviña, Hanna Gladh, Guillem Genové, Christer Betsholtz, Erika Folestad, Karin Tran-Lundmark
Pulmonary hypertension (PH) is a lethal condition and current vasodilator therapy has limited effect. Anti-proliferative strategies targeting platelet-derived growth factor (PDGF) receptors, such as imatinib, have generated promising results in animal studies. Imatinib is however a non-specific tyrosine kinase inhibitor and has in clinical studies caused unacceptable adverse events. Further studies are needed on the role of PDGF signaling in PH. Here, mice expressing a variant of PDGF-B with no retention motif (Pdgfbret/ret), resulting in defective binding to extracellular matrix, were studied...
December 6, 2017: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/29211221/safety-and-feasibility-study-of-a-novel-stent-graft-for-thoracic-endovascular-aortic-repair-a-canine-model-experiment
#11
Fan Yang, Jiehua Qiu, Zeliang Fu, Yuchen Qiu, Junrong Luo, Qingyang Xiao, Huabin Cao
OBJECTIVE: To evaluate the safety and feasibility of a novel stent-graft for thoracic endovascular aortic repair (TEVAR) in a canine model, 9 adult hybrid dogs were used for the experiment. METHODS: All animals were implanted with a novel thoracic aortic stent-graft via femoral artery. Blood sample was collected at pre-operation and 1, 2, 4, 8 and 12 weeks after implantation for hematological examination. Moreover, tissues from randomly selected 4 dogs were subjected to histopathological analysis with the optical microscope after stent-grafts were implanted for 3, 6, 9, and 12 months respectively...
September 2017: Brazilian Journal of Cardiovascular Surgery
https://www.readbyqxmd.com/read/29210189/does-mean-arterial-blood-pressure-scale-with-body-mass-in-mammals-effects-of-measurement-of-blood-pressure
#12
REVIEW
Christian Bo Poulsen, Tobias Wang, Kasper Assersen, Nina Kerting Iversen, Mads Damkjaer
For at least the last 30 years it has been discussed whether mean arterial blood pressure (MAP) is independent of body mass or whether it increases in accordance with the vertical height between the heart and the brain. The debate has centered on the most appropriate mathematical models for analysing allometric scaling and phylogenetic relationships, there has been preciously little focus on evaluating the validity of underlying physiological data. Currently, the two most comprehensive scaling analyses are based on data from 47 species of mammals, based on 114 references...
December 5, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/29208767/the-feasibility-of-low-concentration-contrast-and-low-tube-voltage-in-computed-tomography-perfusion-imaging-an-animal-study
#13
Yuning Pan, Aiqin Song, Shizhong Bu, Zhaoqian Chen, Qiuli Huang, Aijing Li
Aim: To investigate the feasibility of low-concentration contrast (270 mg/mL) together with low tube voltage (80 kV) and adaptive iterative dose reduction (AIDR)-3D reconstruction in liver computed tomography (CT) perfusion imaging. Method: A total of 15 healthy New Zealand rabbits received two CT scans each. The first scan (control) was acquired at 100 kV and 100 mA with iopromide (370 mg/mL), while the second scan (experimental) was acquired at 80 kV and 100 mA with iodixanol (270 mg/mL) 24 hours after the first scan...
December 5, 2017: Bioscience Reports
https://www.readbyqxmd.com/read/29200907/chronic-cerebral-hypoperfusion-and-plasticity-of-the-posterior-cerebral-artery-following-permanent-bilateral-common-carotid-artery-occlusion
#14
Kyung-Ok Cho, Seul-Ki Kim, Seong Yun Kim
Vascular dementia (VaD) is a group of heterogeneous diseases with the common feature of cerebral hypoperfusion. To identify key factors contributing to VaD pathophysiology, we performed a detailed comparison of Wistar and Sprague-Dawley (SD) rats subjected to permanent bilateral common carotid artery occlusion (BCCAo). Eight-week old male Wistar and SD rats underwent BCCAo, followed by a reference memory test using a five-radial arm maze with tactile cues. Continuous monitoring of cerebral blood flow (CBF) was performed with a laser Doppler perfusion imaging (LDPI) system...
November 2017: Korean Journal of Physiology & Pharmacology
https://www.readbyqxmd.com/read/29199231/augmented-contractility-to-noradrenaline-in-femoral-arteries-from-the-otsuka-long-evans-tokushima-fatty-rat-a-model-of-type-2-diabetes
#15
Shota Kobayashi, Takayuki Matsumoto, Makoto Ando, Maika Iguchi, Kumiko Taguchi, Tsuneo Kobayashi
Although vasculopathies may occur systemically, there are few reports regarding femoral arteries of type 2 diabetes. Here, we investigated whether contractile response to noradrenaline in femoral arteries would change in type 2 diabetic male Otsuka Long-Evans Tokushima Fatty (OLETF) rat at the chronic stage of disease (1 year old) versus age-matched control Long-Evans Tokushima Otsuka (LETO) rat. OLETF rat exhibited hyperglycemia, hypertension, hyperlipidemia, and hypoinsulinemia compared to age-matched LETO rat...
2017: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/29197603/a-reliable-mouse-model-of-hindlimb-gangrene
#16
Punam P Parikh, Diego Castilla, Roberta M Lassance-Soares, Hongwei Shao, Manuela Regueiro, Yan Li, Roberto Vazquez-Padron, Keith A Webster, Zhao-Jun Liu, Omaida C Velazquez
INTRODUCTION: Lack of a reliable hindlimb gangrene animal model limits pre-clinical studies of gangrene, a severe form of critical limb ischemia (CLI). We develop a novel mouse hindlimb gangrene model to facilitate translational studies. METHODS: BALB/c, FVB and C57BL/6 mice underwent femoral artery ligation (FAL) with or without administration of NG-nitro-L-arginine methyl ester (L-NAME), an endothelial nitric oxide synthase (eNOS) inhibitor. Gangrene was assessed using standardized ischemia scores ranging from 0 (no gangrene) to 12 (forefoot gangrene)...
November 29, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/29197602/continuous-flow-perfused-cadaver-model-for-endovascular-training-research-and-development
#17
Amrita Sarkar, Richa Kalsi, Joseph D Ayers, Charles B Drucker, Vaidehi Kaushal, William Sutton, Robert S Crawford
BACKGROUND: Endovascular simulation employing computer, animal, and static models are common and useful adjuncts for teaching endovascular procedures and developing novel, complex endovascular techniques. Unfortunately, these models lack realistic haptic feedback and thus do not faithfully replicate many of the technical challenges associated with clinical endovascular procedures (e.g., arterial calcification, rigidity, and stenosis). We sought to develop a realistic and reproducible perfused cadaver model for endovascular training, device development and research...
November 29, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/29196979/changes-in-arterial-pressure-and-markers-of-nitric-oxide-homeostasis-and-oxidative-stress-following-surgical-correction-of-hydronephrosis-in-children
#18
Ammar Al-Mashhadi, Antonio Checa, Nils Wåhlin, Tryggve Neveus, Magdalena Fossum, Craig E Wheelock, Birgitta Karanikas, Arne Stenberg, A Erik G Persson, Mattias Carlstrom
OBJECTIVE: Recent clinical studies have suggested an increased risk of elevated arterial pressure in patients with hydronephrosis. Animals with experimentally induced hydronephrosis develop hypertension, which is correlated to the degree of obstruction and increased oxidative stress. In this prospective study we investigated changes in arterial pressure, oxidative stress, and nitric oxide (NO) homeostasis following correction of hydronephrosis. METHODS: Ambulatory arterial pressure (24 h) was monitored in pediatric patients with hydronephrosis (n = 15) before and after surgical correction, and the measurements were compared with arterial pressure measurements in two control groups, i...
December 1, 2017: Pediatric Nephrology: Journal of the International Pediatric Nephrology Association
https://www.readbyqxmd.com/read/29194344/direct-peritoneal-resuscitation-alters-leukocyte-infiltration-in-the-lung-after-acute-brain-death
#19
Jessica L Weaver, Paul J Matheson, Amy Matheson, Cynthia D Downard, R Neal Garrison, Jason W Smith
BACKGROUND: Brain death is associated with significant lung injury and inflammation. This has been associated with worse long-term outcomes for transplanted lungs. Direct peritoneal resuscitation (DPR) reduces systemic inflammation in brain death and improves lung procurement rate. The effect of DPR on macrophage and neutrophil infiltration in the lungs is not known. METHODS: Male Sprague-Dawley rats had a 4F Fogarty catheter inserted into the skull and the balloon inflated until brain death was achieved...
November 30, 2017: Shock
https://www.readbyqxmd.com/read/29194322/direct-peritoneal-resuscitation-reduces-intestinal-permeability-after-brain-death
#20
Jessica L Weaver, Paul J Matheson, Amy Matheson, Brian G Harbrecht, Cynthia D Downard, R Neal Garrison, Jason W Smith
BACKGROUND: The profound inflammatory response associated with brain death is frequently cited as the reason organs procured from brain dead donors are associated with worse graft function. The intestine releases inflammatory mediators in other types of shock, but its role is brain death has not been well-studied. Direct peritoneal resuscitation (DPR) improves visceral organ blood flow and reduces inflammation after hemorrhagic shock. We hypothesized that use of DPR would maintain intestinal integrity and reduce circulating inflammatory mediators after brain death...
December 1, 2017: Journal of Trauma and Acute Care Surgery
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