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https://www.readbyqxmd.com/read/29471144/intestinal-absorption-and-activation-of-decitabine-amino-acid-ester-prodrugs-mediated-by-peptide-transporter-pept1-and-enterocyte-enzymes
#1
Wenhui Tao, Dongyang Zhao, Mengchi Sun, Ziyu Wang, Bin Lin, Yu Bao, Yingying Li, Zhonggui He, Yinghua Sun, Jin Sun
Decitabine (DAC), a potent DNA methyltransferase (DNMT) inhibitor, has a limited oral bioavailability. Its 5'-amino acid ester prodrugs could improve its oral delivery but the specific absorption mechanism is not yet fully understood. The aim of this present study was to investigate the in vivo absorption and activation mechanism of these prodrugs using in situ intestinal perfusion and pharmacokinetics studies in rats. Although PEPT1 transporter is pH dependent, there appeared to be no proton cotransport in the perfusion experiment with a preferable transport at pH 7...
February 19, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29470970/comparisons-between-histology-and-optical-coherence-tomography-angiography-of-the-periarterial-capillary-free-zone
#2
Chandrakumar Balaratnasingam, Dong An, Yoichi Sakurada, Cecilia S Lee, Aaron Y Lee, Ian L McAllister, K Bailey Freund, Marinko Sarunic, Dao-Yi Yu
PURPOSE: To use the capillary-free zone along retinal arteries, a physiologic area of superficial avascularization, as an anatomic paradigm to investigate the reliability of optical coherence tomographic angiography (OCTA) for visualizing the deep retinal circulation. DESIGN: Validity analysis and laboratory investigation. METHODS: Five normal human donor eyes (mean age 69.8 years) were perfusion-labelled with endothelial antibodies and the capillary networks of the perifovea were visualized using confocal scanning laser microscopy...
February 19, 2018: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/29470630/modified-ante-situm-liver-resection-without-use-of-cold-perfusion-nor-veno-venous-bypass-for-treatment-of-hepatic-lesions-infiltrating-the-hepatocaval-confluence
#3
F Oldhafer, K I Ringe, K Timrott, M Kleine, O Beetz, W Ramackers, S Cammann, J Klempnauer, F W R Vondran, H Bektas
PURPOSE: Treatment of malignancies invading the hepatic veins/inferior vena cava is a surgical challenge. An ante situm technique allows luxation of the liver in front of the situs to perform tumor resection. Usually, cold perfusion and veno-venous bypass are applied. Our experience with modified ante situm resection relying only on total vascular occlusion is reported. METHODS: Retrospective analysis on an almost 15-year experience with ante situm resection without application of cold perfusion or veno-venous bypass RESULTS: The ante situm technique was applied on eight patients...
February 22, 2018: Langenbeck's Archives of Surgery
https://www.readbyqxmd.com/read/29470616/automated-spect-analysis-compared-with-expert-visual-scoring-for-the-detection-of-ffr-defined-coronary-artery-disease
#4
R S Driessen, P G Raijmakers, I Danad, W J Stuijfzand, S P Schumacher, J A Leipsic, J K Min, J Knuuti, A A Lammertsma, A C van Rossum, N van Royen, S R Underwood, P Knaapen
PURPOSE: Traditionally, interpretation of myocardial perfusion imaging (MPI) is based on visual assessment. Computer-based automated analysis might be a simple alternative obviating the need for extensive reading experience. Therefore, the aim of the present study was to compare the diagnostic performance of automated analysis with that of expert visual reading for the detection of obstructive coronary artery disease (CAD). METHODS: 206 Patients (64% men, age 58...
February 22, 2018: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/29470434/pharmacokinetics-and-scintigraphic-imaging-of-the-hypoxia-imaging-agent-123-i-iaza-in-healthy-adults-following-exercise-based-cardiac-stress-%C3%A2
#5
Daria Stypinski, Stephen A McQuarrie, Alexander J B McEwan, Leonard I Wiebe
The objective of this work is to evaluate the potential effect of cardiac stress exercise on the accumulation of [123 I]IAZA, a radiopharmaceutical used to image focal tissue hypoxia, in otherwise normal myocardium in healthy volunteers, and to determine the impact of exercise on [123 I]IAZA pharmacokinetics. The underlying goal is to establish a rational basis and a baseline for studies of focal myocardial hypoxia in cardiac patients using [123 I]IAZA. Three healthy male volunteers ran the 'Bruce' treadmill protocol, a clinically-accepted protocol designed to expose myocardial ischemia in patients...
February 22, 2018: Pharmaceutics
https://www.readbyqxmd.com/read/29470361/early-heterogenic-response-of-renal-microvasculature-to-hemorrhagic-shock-resuscitation-and-the-influence-of-nf-%C3%AE%C2%BAb-pathway-blockade
#6
Rui Yan, Matijs van Meurs, Eliane R Popa, Ranran Li, Peter J Zwiers, Jan G Zijlstra, Jill Moser, Grietje Molema
Hemorrhagic shock (HS) is associated with low blood pressure due to excessive loss of circulating blood and causes both macrocirculatory and microcirculatory dysfunction. Fluid resuscitation after HS is used in the clinic to restore tissue perfusion. The persistent microcirculatory damage caused by HS and/or resuscitation can result in multiple organ damage, with the kidney being one of the involved organs. The kidney microvasculature consists of different segments that possess a remarkable heterogeneity in functional properties...
February 21, 2018: Shock
https://www.readbyqxmd.com/read/29470136/-15-o-h-2-o-pet-ct-as-a-tool-for-the-quantitative-assessement-of-early-post-radiotherapy-changes-of-heart-perfusion-in-breast-carcinoma-patients
#7
Agnieszka Żyromska, Bogdan Małkowski, Tomasz Wiśniewski, Karolina Majewska, Joanna Reszke, Roman Makarewicz
OBJECTIVE: Studies examining radiation-induced heart toxicity in breast cancer patients are inconclusive. The aim of this study was to prospectively and quantitatively asses myocardial blood flow (MBF) with, for the first time, 15O-H2O PET/CT as a marker of heart damage in irradiated breast cancer patients. METHODS: Fifteen breast cancer patients receiving intact breast or chest wall irradiation were included in the analysis (six with right-sided and nine with left-sided breast cancer)...
February 22, 2018: British Journal of Radiology
https://www.readbyqxmd.com/read/29469635/in-the-experimental-model-of-acute-mesenteric-ischemia-the-correlation-of-blood-diagnostic-parameters-with-the-duration-of-ischemia-and-their-effects-on-choice-of-treatment
#8
Mikail Cakir, Dogan Yildirim, Fatma Sarac, Turgut Donmez, Semih Mirapoglu, Adnan Hut, Fazilet Erozgen, Omer Faruk Ozer, Melih Ozgun Gecer, Leyla Zeynep Tigrel, Oguzhan Tas
Purpose/Aim: Acute mesenteric ischemia is a syndrome characterized by sudden onset abdominal pain followed by intestinal necrosis. Morbidity and mortality increase with delayed diagnosis. Even with the latest radiological diagnostic methods, early diagnosis and initiation of treatment can be delayed. Using an experimental model, here we aim to determine the relationship between the laboratory parameters used to detect acute mesenteric ischemia and the duration of irreversible ischemia. MATERIALS AND METHODS: A total of 30 male Wistar albino rats were divided into five groups, all of which underwent general anesthesia: (i) Superior mesenteric artery (SMA) dissection with laparotomy was performed, and blood samples and intestinal segment samples were taken after 2 hr (Sham group); (ii) volvulus of one-third of the small intestines was performed manually by laparotomy, and blood samples and intestinal segment samples were taken after 2 hr (Volvulus group); (iii) SMA was ligated with laparotomy, and blood samples and intestinal segment samples were taken after 2 hr (SMA+ligated 2-hr group); (iv) SMA was ligated with laparotomy, and blood samples and intestinal segment samples were taken after 4 hr (SMA+ligated 4-hr group); and (v) SMA was ligated with laparotomy, and blood samples and intestinal segment samples were taken after 6 hr (SMA+ligated 6-hr group)...
February 22, 2018: Journal of Investigative Surgery: the Official Journal of the Academy of Surgical Research
https://www.readbyqxmd.com/read/29468594/an-ovine-model-for-studying-the-pathophysiology-of-septic-acute-kidney-injury
#9
Yugeesh R Lankadeva, Junko Kosaka, Roger G Evans, Clive N May
The development of acute kidney injury (AKI) is both a significant and independent prognostic factor of mortality in patients with sepsis, but its pathophysiology remains unclear. Herein, we describe an ovine model of sepsis evoked by the administration of live Escherichia coli in which there is hypotension, peripheral vasodilatation with a large increase in cardiac output; a similar hyperdynamic state to that commonly reported in humans. Interestingly, in this sheep model of sepsis, despite an increase in global kidney blood flow, there is a progressive reduction in renal function...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29468467/adverse-effects-associated-with-regadenoson-myocardial-perfusion-imaging
#10
EDITORIAL
Efstathia Andrikopoulou, Fadi G Hage
No abstract text is available yet for this article.
February 21, 2018: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/29468261/in-vivo-molecular-profiling-of-human-glioma-cross-sectional-observational-study-using-dynamic-susceptibility-contrast-magnetic-resonance-perfusion-imaging
#11
Johann-Martin Hempel, Jens Schittenhelm, Uwe Klose, Benjamin Bender, Georg Bier, Marco Skardelly, Ghazaleh Tabatabai, Salvador Castaneda Vega, Ulrike Ernemann, Cornelia Brendle
PURPOSE: To assess the diagnostic performance of dynamic susceptibility contrast perfusion magnetic resonance perfusion imaging (DSC-MRI) for in vivo human glioma molecular profiling. METHODS: In this study 100 patients with histopathologically confirmed glioma who provided written informed consent were retrospectively assessed between January 2016 and February 2017 in two prospective trials that were approved by the local institutional review board. Cerebral blood volume (CBV) measurements from DSC-MRI were assessed, and histogram parameters of relative CBV (rCBV) results were compared among World Health Organization (WHO) 2016 based histological findings and molecular characteristics...
February 21, 2018: Clinical Neuroradiology
https://www.readbyqxmd.com/read/29468217/ranibizumab-induced-retinal-reperfusion-and-regression-of-neovascularization-in-diabetic-retinopathy-an-angiographic-illustration
#12
Shruti Chandra, Jay Sheth, Giridhar Anantharaman, Mahesh Gopalakrishnan
Purpose: To report regression of neovascularization and reperfusion of ischemic areas of the retina on Wide-field Digital Fluorescein Angiography following anti-vascular endothelial growth factor injections in a patient with active Proliferative Diabetic Retinopathy. Observations: Case report of sixty-one-year-old male patient with proliferative diabetic retinopathy and diabetic macular edema documented on wide field digital fluorescein angiography. The patient was treated with three intravitreal injections of ranibizumab given at monthly intervals...
March 2018: American Journal of Ophthalmology Case Reports
https://www.readbyqxmd.com/read/29467346/absorption-and-metabolism-of-orally-administered-collagen-hydrolysates-evaluated-by-the-vascularly-perfused-rat-intestine-and-liver-in-situ
#13
Yoshihiro Osawa, Takafumi Mizushige, Sayuri Jinno, Fumihito Sugihara, Naoki Inoue, Hideyuki Tanaka, Yukihito Kabuyama
A number of studies have shown that oral administration of collagen hydrolysate (CH) results in the absorption of di- and tri-peptides. In order to understand the dynamics of CH absorption and metabolism, molecular profiles of hydroxyproline (Hyp) and Hyp-containing peptides (HCPs) were analyzed by in situ perfusion of rat intestine and liver. The total amount of absorbed HCPs during 1 h of perfusion was 16.6 μmol, which was significantly higher than that of free Hyp (6.6 μmol). In addition, HCPs were also reliably detected in hepatic perfusate at the level higher than free Hyp...
2018: Biomedical Research
https://www.readbyqxmd.com/read/29467285/angiogenic-patterning-by-steel-an-endothelial-enriched-long-noncoding-rna
#14
H S Jeffrey Man, Aravin N Sukumar, Gabrielle C Lam, Paul J Turgeon, Matthew S Yan, Kyung Ha Ku, Michelle K Dubinsky, J J David Ho, Jenny Jing Wang, Sunit Das, Nora Mitchell, Peter Oettgen, Michael V Sefton, Philip A Marsden
Endothelial cell (EC)-enriched protein coding genes, such as endothelial nitric oxide synthase (eNOS), define quintessential EC-specific physiologic functions. It is not clear whether long noncoding RNAs (lncRNAs) also define cardiovascular cell type-specific phenotypes, especially in the vascular endothelium. Here, we report the existence of a set of EC-enriched lncRNAs and define a role for s pliced- t ranscript e ndothelial- e nriched lncRNA (STEEL) in angiogenic potential, macrovascular/microvascular identity, and shear stress responsiveness...
February 21, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29467221/vascular-development
#15
REVIEW
Mark W Majesky
The vascular system forms as a branching network of endothelial cells that acquire identity as arterial, venous, hemogenic, or lymphatic. Endothelial specification depends on gene targets transcribed by Ets domain-containing factors, including Ets variant gene 2 (Etv2), together with the activity of chromatin-remodeling complexes containing Brahma-related gene-1 (Brg1). Once specified and assembled into vessels, mechanisms regulating lumen diameter and axial growth ensure that the structure of the branching vascular network matches the need for perfusion of target tissues...
March 2018: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/29467198/endothelial-tfeb-positively-regulates-post-ischemic-angiogenesis
#16
Yanbo Fan, Haocheng Lu, Wenying Liang, Minerva T Garcia-Barrio, Yanhong Guo, Ji Zhang, Tianqing Zhu, Yibai Hao, Jifeng Zhang, Y E Chen
<u>Rationale:</u> Post-ischemic angiogenesis is critical to limit the ischemic tissue damage and improve the blood flow recovery. The regulation and the underlying molecular mechanisms of post-ischemic angiogenesis are not fully unraveled. Transcription factor-EB (TFEB) is emerging as a master gene for autophagy and lysosome biogenesis. However, the role of TFEB in vascular disease is less understood. <u>Objective:</u> We aimed to determine the role of endothelial TFEB in post-ischemic angiogenesis and its underlying molecular mechanism...
February 21, 2018: Circulation Research
https://www.readbyqxmd.com/read/29467161/outcomes-of-non-invasive-diagnostic-modalities-for-the-detection-of-coronary-artery-disease-network-meta-analysis-of-diagnostic-randomised-controlled-trials
#17
George Cm Siontis, Dimitris Mavridis, John P Greenwood, Bernadette Coles, Adriani Nikolakopoulou, Peter Jüni, Georgia Salanti, Stephan Windecker
OBJECTIVE: To evaluate differences in downstream testing, coronary revascularisation, and clinical outcomes following non-invasive diagnostic modalities used to detect coronary artery disease. DESIGN: Systematic review and network meta-analysis. DATA SOURCES: Medline, Medline in process, Embase, Cochrane Library for clinical trials, PubMed, Web of Science, SCOPUS, WHO International Clinical Trials Registry Platform, and Clinicaltrials.gov...
February 21, 2018: BMJ: British Medical Journal
https://www.readbyqxmd.com/read/29467117/the-effects-of-bougie-diameters-on-tissue-oxygen-levels-after-sleeve-gastrectomy-a-randomized-experimental-trial
#18
Can Konca, Ali Abbas Yılmaz, Süleyman Utku Çelik, Selami Ilgaz Kayılıoğlu, Özge Tuğçe Paşaoğlu, Halil Arda Ceylan, Volkan Genç
BACKGROUND: Staple-line leak is the most frightening complication of laparoscopic sleeve gastrectomy and several predisposing factors such as using improper staple sizes regardless of gastric wall thickness, narrower bougie diameter and ischemia of the staple line are asserted. AIMS: The goal of this study was to evaluate the effects of different bougie diameters on tissue oxygen partial pressure at the esophagogastric junction after sleeve gastrectomy. STUDY DESIGN: The study was designed as a randomized and controlled animal experiment with 1:1:1:1 allocation ratio...
February 20, 2018: Balkan Medical Journal
https://www.readbyqxmd.com/read/29467101/ultrasound-screening-for-complications-in-twin-pregnancy
#19
Rosemary Townsend, Asma Khalil
In the decades since the introduction of ultrasound into routine obstetric practice, the advantages of ultrasound have moved beyond the simple ability to identify multiple pregnancies antenatally to the possibility of screening them for fetal anomalies, pre-eclampsia, preterm birth, and the complications specific to monochorionic pregnancies. Screening studies have often excluded twins because physiological differences impact on the validity and sensitivity of the screening tests in routine use in singletons, and therefore, the evidence of screening performance in multiple pregnancy lags behind the evidence from singleton pregnancies...
February 18, 2018: Seminars in Fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/29467047/myocardial-stress-perfusion-magnetic-resonance-in-children-with-hypertrophic-cardiomyopathy
#20
Lazaro E Hernandez
BACKGROUND: Microvascular dysfunction in hypertrophic cardiomyopathy has been associated with poor clinical outcome. Several studies have demonstrated a reduced perfusion reserve proportional to the magnitude of the hypertrophy. We investigated the utility of stress perfusion cardiac MRI to detect microvascular dysfunction in children with hypertrophic cardiomyopathy. METHODS: From January 2016 to January 2017, 13 patients, with a mean age of 15.3 years, with hypertrophic cardiomyopathy underwent regadenoson stress perfusion cardiac MRI (1...
February 22, 2018: Cardiology in the Young
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