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Vascular physiology

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https://www.readbyqxmd.com/read/28323995/renin-phenotypes-characterize-vascular-disease-autonomous-aldosteronism-and-mineralocorticoid-receptor-activity
#1
Gregory L Hundemer, Rene Baudrand, Jenifer M Brown, Gary Curhan, Gordon H Williams, Anand Vaidya
Context: Mild cases of autonomous aldosterone secretion may go unrecognized using current diagnostic criteria for primary aldosteronism (PA). Objective: To investigate whether the inability to stimulate renin serves as a biomarker for unrecognized autonomous aldosterone secretion and mineralocorticoid receptor (MR) activation. Participants: 663 normotensive and mildly hypertensive participants, who were confirmed to not have PA using current guideline criteria and were on no antihypertensive medications...
February 17, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28319794/apoplastic-gamma-glutamyl-transferase-activity-encoded-by-ggt1-and-ggt2-is-important-for-vegetative-and-generative-development
#2
Sabrina Giaretta, Dinesh Prasad, Ilaria Forieri, Teofilo Vamerali, Anna Rita Trentin, Markus Wirtz, Rüdiger Hell, Antonio Masi
Gamma-glutamyl transferase (GGT; EC 2.3.2.2) is the only enzyme capable of degrading glutathione (GSH) in extra-cytosolic spaces. In plant cells, the GGT1 and GGT2 isoforms are located in the apoplast, bound respectively to the cell wall and the plasma membrane. GGT1 is expressed throughout plants, mainly in the leaves and vascular system, while GGT2 is more specifically expressed in seeds and trichomes, and weakly in roots. Their role in plant physiology remains to be clarified, however. Obtaining the ggt1/ggt2 double mutant can offer more clues than the corresponding single mutants, and to prevent any compensatory expression between the two isoforms...
March 10, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28319593/profiles-of-long-noncoding-rnas-in-hypertensive-rats-long-noncoding-rna-xr007793-regulates-cyclic-strain-induced-proliferation-and-migration-of-vascular-smooth-muscle-cells
#3
Qing-Ping Yao, Zhi-Wei Xie, Kai-Xuan Wang, Ping Zhang, Yue Han, Ying-Xin Qi, Zong-Lai Jiang
BACKGROUND: Long noncoding RNAs (lncRNAs) are being discovered in multiple diseases at a rapid pace. However, the contribution of lncRNAs to hypertension remains largely unknown. In hypertension, the vascular walls are exposed to abnormal mechanical cyclic strain, which leads to vascular remodelling. Here, we investigated the mechanobiological role of lncRNAs in hypertension. METHODS AND RESULTS: Differences in the lncRNAs and mRNAs between spontaneously hypertensive rats and Wistar-Kyoto rats were screened using a gene microarray...
March 17, 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/28319329/extracellular-acidosis-and-very-low-na-inhibit-nbcn1-and-nhe1-mediated-net-acid-extrusion-from-mouse-vascular-smooth-muscle-cells
#4
Lisbeth Bonde, Ebbe Boedtkjer
AIM: The electroneutral Na(+) ,HCO3(-) -cotransporter NBCn1 and Na(+) /H(+) -exchanger NHE1 regulate acid-base balance in vascular smooth muscle cells (VSMCs) and modify artery function and structure. Pathological conditions-notably ischemia-can dramatically perturb intracellular (i) and extracellular (o) pH and [Na(+) ]. We examined effects of low [Na(+) ]o and pHo on NBCn1 and NHE1 activity in VSMCs of small arteries. METHODS: We measured pHi by 2',7'-bis-(2-carboxyethyl)-5-(and-6)-carboxyfluorescein-based fluorescence microscopy of mouse mesenteric arteries and induced intracellular acidification by NH4(+) -prepulse technique...
March 20, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28319199/a-computational-analysis-of-in-vivo-vegfr-activation-by-multiple-co-expressed-ligands
#5
Lindsay E Clegg, Feilim Mac Gabhann
The splice isoforms of vascular endothelial growth A (VEGF) each have different affinities for the extracellular matrix (ECM) and the coreceptor NRP1, which leads to distinct vascular phenotypes in model systems expressing only a single VEGF isoform. ECM-immobilized VEGF can bind to and activate VEGF receptor 2 (VEGFR2) directly, with a different pattern of site-specific phosphorylation than diffusible VEGF. To date, the way in which ECM binding alters the distribution of isoforms of VEGF and of the related placental growth factor (PlGF) in the body and resulting angiogenic signaling is not well-understood...
March 20, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28319153/a-general-model-for-metabolic-scaling-in-self-similar-asymmetric-networks
#6
Alexander Byers Brummer, Van M Savage, Brian J Enquist
How a particular attribute of an organism changes or scales with its body size is known as an allometry. Biological allometries, such as metabolic scaling, have been hypothesized to result from selection to maximize how vascular networks fill space yet minimize internal transport distances and resistances. The West, Brown, Enquist (WBE) model argues that these two principles (space-filling and energy minimization) are (i) general principles underlying the evolution of the diversity of biological networks across plants and animals and (ii) can be used to predict how the resulting geometry of biological networks then governs their allometric scaling...
March 20, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28318556/natural-killer-cells-in-placentation-and-cancer-implications-for-hypertension-during-pregnancy
#7
Heather Yvonne Small, Denise C Cornelius, Tomasz J Guzik, Christian Delles
Hypertension during pregnancy is the most common medical condition encountered during gestation. Despite this, knowledge of the mechanisms that underlie the disease and the development of new therapies are limited. Hypertension during pregnancy and some forms of cancer confer an increased risk to the development of cardiovascular disease later in life; one mechanism which may link these conditions is the involvement of natural killer (NK) cells. Whilst immunology and immunotherapy are well-developed areas in oncology; the complex mechanisms of the immune system in health and disease at the maternal-fetal interface are less well-defined...
March 7, 2017: Placenta
https://www.readbyqxmd.com/read/28317351/-effects-of-porphyromonas-gingivalis-on-interleukin-33-expression-in-rabbit-vascular-endothelium-tissues
#8
Li Weishan, Li Dechao, Qiu Rongrong
OBJECTIVE: To investigate interleukin-33 (IL-33) in the arterial vascular endothelium of rabbits infected with Porphyromonas gingivalis (P. gingivalis), and to explore the relationship between P. gingivalis and atherosclerosis. METHODS: A total of 24 rabbits were randomly divided into control and experimental groups. The experimental group received intravenous injection of P. gingivalis once a week for 12 weeks to establish a coronary atherosclerosis model. The rabbits in the control group were injected with equal volume of physiological saline...
August 1, 2016: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/28316143/endothelial-microparticles-act-as-novel-diagnostic-and-therapeutic-biomarkers-of-circulatory-hypoxia-related-diseases-a-literature-review
#9
REVIEW
Fan Deng, Shuang Wang, Liangqing Zhang
Circulatory hypoxia-related diseases (CHRDs), including acute coronary syndromes, stroke and organ transplantation, attract increased attention due to high morbidity and mortality. Mounting evidence shows that hypoxia-induced oxidative stress, coagulation, inflammation and angiogenesis play extremely important roles in the physiological and pathological processes of CHRD-related vascular endothelial injury. Interestingly, hypoxia, even hypoxia-induced oxidative stress, coagulation and inflammation can all induce release of endothelial microparticles (EMPs)...
March 18, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28315681/differential-sex-specific-effects-of-oxygen-toxicity-in-human-umbilical-vein-endothelial-cells
#10
Yuhao Zhang, Krithika Lingappan
Despite the well-established sex-specific differences in the incidence of bronchopulmonary dysplasia (BPD), the molecular mechanism(s) behind these are not completely understood. Pulmonary angiogenesis is critical for alveolarization and arrest in vascular development adversely affects lung development. Human neonatal umbilical vein endothelial cells (HUVECs) provide a robust in vitro model for the study of endothelial cell physiology and function. Male and Female HUVECs were exposed to room air (21% O2, 5% CO2) or hyperoxia (95% O2, 5% CO2) for up to 72 h...
March 15, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28315426/vascular-patterning-in-human-heterotopic-ossification
#11
Margaret Cocks, Aditya Mohan, Carolyn A Meyers, Catherine Ding, Benjamin Levi, Edward McCarthy, Aaron W James
Heterotopic ossification (HO, also termed myositis ossificans) is the formation of extra-skeletal bone in muscle and soft tissues. HO is a tissue repair process gone awry, and is a common complication of surgery and traumatic injury. Medical strategies to prevent and treat HO fall well short of addressing the clinical need. Better characterization of the tissues supporting HO is critical to identifying therapies directed against this common and sometimes devastating condition. The physiologic processes of osteogenesis and angiogenesis are highly coupled and interdependent...
March 14, 2017: Human Pathology
https://www.readbyqxmd.com/read/28314534/total-cavopulmonary-connection-with-a-new-bioabsorbable-vascular-graft-first-clinical-experience
#12
Leo A Bockeria, Oleg Svanidze, Alex Kim, Konstantin Shatalov, Vladimir Makarenko, Martijn Cox, Thierry Carrel
OBJECTIVES: To assess safety and clinical performance of a novel bioabsorbable vascular graft in pediatric patients with univentricular cardiac malformation who received surgical correction via an extracardiac cavopulmonary conduit. METHODS: The implanted graft material is designed to attract patient's own cells and proteins, which trigger a cascade of physiological events leading to endogenous tissue restoration. As the graft resorbs progressively after implantation, components of native tissue including collagen, endothelial lining, and capillary blood vessels develop and organize into a natural tissue...
February 7, 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28306664/kr%C3%A3-ppel-like-factors-in-endothelial-cell-biology
#13
Eugene Chang, Lalitha Nayak, Mukesh K Jain
PURPOSE OF REVIEW: Krüppel-like factors (KLFs) are a family of transcription factors that regulate integral functions of endothelial cells including inflammation, proliferation, growth, apoptosis, cell differentiation and plasticity, and migration. This review will focus on the role of KLFs in physiological activity and their loss in vascular pathology. RECENT FINDINGS: New studies have pointed at the role of microRNAs as repressors of KLFs in atherosclerotic areas providing another level of signaling regulation of KLFs...
March 16, 2017: Current Opinion in Hematology
https://www.readbyqxmd.com/read/28304127/molecular-regulation-of-sucrose-catabolism-and-sugar-transport-for-development-defence-and-phloem-function
#14
REVIEW
Jun Li, Limin Wu, Ryan Foster, Yong-Ling Ruan
Sucrose (Suc) is the major end product of photosynthesis in mesophyll cells of most vascular plants. It is loaded into phloem of mature leaves for long-distance translocation to non-photosynthetic organs where it is unloaded for diverse uses. Clearly, Suc transport and metabolism is central to plant growth and development and the functionality of the entire vascular system. Despite of vast information in the literature about the physiological roles of individual sugar metabolic enzymes and transporters, there is a lack of systematic evaluation about their molecular regulation from transcriptional to post-translational levels...
March 17, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28303921/partitioning-of-red-blood-cell-aggregates-in-bifurcating-microscale-flows
#15
E Kaliviotis, J M Sherwood, S Balabani
Microvascular flows are often considered to be free of red blood cell aggregates, however, recent studies have demonstrated that aggregates are present throughout the microvasculature, affecting cell distribution and blood perfusion. This work reports on the spatial distribution of red blood cell aggregates in a T-shaped bifurcation on the scale of a large microvessel. Non-aggregating and aggregating human red blood cell suspensions were studied for a range of flow splits in the daughter branches of the bifurcation...
March 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28303909/sprint-interval-training-induces-a-sexual-dimorphism-but-does-not-improve-peak-bone-mass-in-young-and-healthy-mice
#16
Kathrin Koenen, Isabell Knepper, Madlen Klodt, Anja Osterberg, Ioannis Stratos, Thomas Mittlmeier, Tina Histing, Michael D Menger, Brigitte Vollmar, Sven Bruhn, Brigitte Müller-Hilke
Elevated peak bone mass in early adulthood reduces the risk for osteoporotic fractures at old age. As sports participation has been correlated with elevated peak bone masses, we aimed to establish a training program that would efficiently stimulate bone accrual in healthy young mice. We combined voluntary treadmill running with sprint interval training modalities that were tailored to the individual performance limits and were of either high or intermediate intensity. Adolescent male and female STR/ort mice underwent 8 weeks of training before the hind legs were analyzed for cortical and trabecular bone parameters and biomechanical strength...
March 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28302033/effects-of-hyperlipidemia-and-cardiovascular-diseases-on-proliferation-differentiation-and-homing-of-mesenchymal-stem-cells
#17
Xin Ye, Chengfei Zhang
Various clinical studies have revealed that cardiovascular diseases (CVD) are associated with bone loss diseases such as osteoporosis and periodontitis, especially in older population. As one of the best-established risk factors of CVD, hyperlipidemia is also reported to interfere with the metabolism, function and regeneration of mineralized tissues. Derived from postnatal tissue reservoirs, mesenchymal stem cells (MSCs) are considered promising cell sources for mesenchymal and non-mesenchymal tissue regeneration based on their capacities for self-renewal and multi-lineage differentiation as well as potent immunosuppressive effects, secretion of cytokines and regulation of vascularization...
March 16, 2017: Current Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28299744/a-simple-adaptable-blood-brain-barrier-cell-model-for-screening-matrix-metalloproteinase-inhibitor-functionality
#18
Jennifer S Myers, Joan Hare, Qing-Xiang Amy Sang
The blood-brain barrier is a multicellular and basement membrane unit that regulates molecular transport between the blood and central nervous system. Many cerebral pathologies, such as acute stroke and chronic vascular dementia, result in a disrupted blood-brain barrier, increasing its permeability and allowing the entry of potentially neurotoxic molecules. The activation of matrix metalloproteinases mediates further blood-brain barrier damage. The inhibition of matrix metalloproteinases is a potential strategy for stroke therapy...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28299269/temporalis-pull-through-vs-fascia-lata-augmentation-in-facial-reanimation-for-facial-paralysis
#19
S M Balaji
OBJECTIVES: Surgical rehabilitation of facial palsy is challenging as each case is unique and success rate is often unpredictable. In one technique, temporalis is elevated from origin preserving vessels, and this elevation increases the length which is tunneled into buccal tissues (pull-through technique, Group A). In the other technique, a harvested fascia lata is attached to temporalis after a coronoidectomy release and the fascia lata is attached to the modiolus (Group B). The aim of this study is to compare the two different surgical techniques...
July 2016: Annals of Maxillofacial Surgery
https://www.readbyqxmd.com/read/28297683/effects-of-hypothermia-on-the-mechanical-behavior-of-rabbit-femoral-arteries
#20
Kozaburo Hayashi, Yuki Kurose
The need to better understand the effects of non-physiological temperatures on arterial wall behavior is becoming more important because of the increased clinical use of hypothermal and hyperthermal treatments. The present study was performed to examine the effects of temperature on the mechanical behavior of femoral arteries excised from rabbits. Among 17, 27, 37, and 42°C, there were no significant differences in their diameter, stiffness, and P-D relations under the physiologically normal, control condition, although the arterial diameter was slightly smaller at 42°C than at the other three temperatures...
March 6, 2017: Journal of the Mechanical Behavior of Biomedical Materials
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