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Vascular physiology

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https://www.readbyqxmd.com/read/28649750/vasopressin-physiology-assessment-and-osmosentation
#1
Lise Bankir, Daniel G Bichet, Nils G Morgenthaler
Vasopressin (AVP) plays a major role in the regulation of water and sodium homeostasis by its antidiuretic action on the kidney, mediated by V2 receptors. AVP secretion is stimulated by a rise in plasma osmolality, a decline in blood volume, or stress. V1a receptors are expressed in vascular smooth muscle cells but the role of vasopressin in blood pressure regulation is still a matter of debate. AVP may also play a role in some metabolic pathways, including gluconeogenesis, through its action on V1a receptors expressed in the liver...
June 25, 2017: Journal of Internal Medicine
https://www.readbyqxmd.com/read/28649146/a-predictive-framework-to-elucidate-venous-stenosis-cfd-shape-optimization
#2
S M Javid Mahmoudzadeh Akherat, Kevin Cassel, Michael Boghosian, Mary Hammes, Fredric Coe
The surgical creation of vascular accesses for renal failure patients provides an abnormally high flow rate conduit in the patient's upper arm vasculature that facilitates the hemodialysis treatment. These vascular accesses, however, are very often associated with complications that lead to access failure and thrombotic incidents, mainly due to excessive neointimal hyperplasia (NH) and subsequently stenosis. Development of a framework to monitor and predict the evolution of the venous system post access creation can greatly contribute to maintaining access patency...
July 1, 2017: Computer Methods in Applied Mechanics and Engineering
https://www.readbyqxmd.com/read/28647579/frailty-is-associated-with-lower-expression-of-genes-involved-in-cellular-response-to-stress-results-from-the-toledo-study-for-healthy-aging
#3
Mariam El Assar, Javier Angulo, José Antonio Carnicero, Stefan Walter, Francisco José García-García, Eva López-Hernández, José-María Sánchez-Puelles, Leocadio Rodríguez-Mañas
BACKGROUND: Specific mechanisms underlying frailty syndrome are not well known. Frailty can be viewed as a loss of functional reserve resulting in increased vulnerability to stressors. We hypothesize that pathways regulating cellular response to stress are potential players in the development of frailty. The aim of this study was to evaluate the association of the expression of certain genes related to cellular response to stress with the presence of frailty in older patients. METHODS: A sample of 350 individuals aged 65 years or older (22% frail) was selected from the Toledo Study of Healthy Aging...
June 21, 2017: Journal of the American Medical Directors Association
https://www.readbyqxmd.com/read/28646803/effects-of-balneotherapy-on-serum-levels-of-shingosine-1-phosphate-in-patients-with-osteoarthritis
#4
Esra Aycan Ustyol, Fatih Karaarslan, Seldag Bekpinar, Kagan Ozkuk, Nergis Erdogan
Context • Balneotherapy is one of the most commonly used nonpharmacological interventions for osteoarthritis (OA), but its mechanism of action in relieving pain and stiffness and in improving physical function is not well understood. Studies have found that therapy provokes a series of neuroendocrinal reactions with anti-inflammatory and analgesic effects. Sphingosine-1-phosphate (S1P), a bioactive lipid, has been implicated as an important mediator in the maintenance of physiological processes (eg, vascular barrier integrity) and in pathophysiologic processes such as inflammatory conditions...
June 23, 2017: Alternative Therapies in Health and Medicine
https://www.readbyqxmd.com/read/28645930/genomic-and-non-genomic-effects-of-androgens-in-the-cardiovascular-system-clinical-implications
#5
REVIEW
Angela K Lucas-Herald, Rheure Alves-Lopes, Augusto C Montezano, S Faisal Ahmed, Rhian M Touyz
The principle steroidal androgens are testosterone and its metabolite 5α-dihydrotestosterone (DHT), which is converted from testosterone by the enzyme 5α-reductase. Through the classic pathway with androgens crossing the plasma membrane and binding to the androgen receptor (AR) or via mechanisms independent of the ligand-dependent transactivation function of nuclear receptors, testosterone induces genomic and non-genomic effects respectively. AR is widely distributed in several tissues, including vascular endothelial and smooth muscle cells...
July 1, 2017: Clinical Science (1979-)
https://www.readbyqxmd.com/read/28645858/vascular-adaptation-pattern-formation-and-cross-validation-between-an-agent-based-model-and-a-dynamical-system
#6
Marc Garbey, Stefano Casarin, Scott A Berceli
Myocardial infarction is the global leading cause of mortality (Go AS et al. 2014). Coronary artery occlusion is its main etiology and it is commonly treated by Coronary Artery Bypass Graft (CABG) surgery (Wilson CT 2007). The long-term outcome remains unsatisfactory (Benedetto U 2016). The vein faces the phenomenon of restenosis during the post-surgery, which consists of re-occlusion of the lumen and usually requires secondary intervention even within one year after the initial surgery (Harskamp RE 2013). We propose an extensive study of the restenosis phenomenon by implementing two mathematical models previously developed: a heuristic Dynamical System (DS) (Garbey M and Berceli SA 2013), and a stochastic Agent Based Model (ABM) (Garbey M et al...
June 20, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28645127/-high-prevalence-of-antipsychotic-medication-use-in-dementia-patients-in-german-neuropsychiatric-practices
#7
Jens Bohlken, Anke Booker, Karel Kostev
Background The aim of the present study was to examine inpatients as well as patients living at home with respect to the frequency of antipsychotic medication use and to determine the factors leading to initial use of antipsychotics following dementia diagnosis. Methods This study included patients aged 60 years and over with an initial diagnosis of all-cause dementia (index date) by German psychiatrists in Disease Analyzer database (IMS Health). The main outcome measure was the proportion of patients who initially received an antipsychotic prescription after the index date...
June 2017: Fortschritte der Neurologie-Psychiatrie
https://www.readbyqxmd.com/read/28644844/carbonic-anhydrase-inhibitor-attenuates-ischemia-reperfusion-induced-acute-lung-injury
#8
Chou-Chin Lan, Chung-Kan Peng, Shih-En Tang, Kun-Lun Huang, Chin-Pyng Wu
Ischemia-reperfusion (IR)-induced acute lung injury (ALI) is implicated in several clinical conditions including lung transplantation, cardiopulmonary bypass surgery, re-expansion of collapsed lung from pneumothorax or pleural effusion and etc. IR-induced ALI remains a challenge in the current treatment. Carbonic anhydrase has important physiological function and influences on transport of CO2. Some investigators suggest that CO2 influences lung injury. Therefore, carbonic anhydrase should have the role in ALI...
2017: PloS One
https://www.readbyqxmd.com/read/28644070/particulate-matter-disrupts-human-lung-endothelial-cell-barrier-integrity-via-rho-dependent-pathways
#9
Ting Wang, Yuka Shimizu, Xiaomin Wu, Gabriel T Kelly, Xiaoyan Xu, Lichun Wang, Zhongqing Qian, Yin Chen, Joe G N Garcia
Increased exposure to ambient particulate matter (PM) is associated with elevated morbidity and mortality in patients with cardiopulmonary diseases and cancer. We and others have shown that PM induces lung microvascular barrier dysfunction which potentially enhances the systemic toxicity of PM. However, the mechanisms by which PM disrupts vascular endothelial integrity remain incompletely explored. We hypothesize that PM induces endothelial cell (EC) cytoskeleton rearrangement via Rho GTPase-dependent pathways to facilitate vascular hyperpermeability...
June 23, 2017: Pulmonary Circulation
https://www.readbyqxmd.com/read/28643578/coronary-microvascular-dysfunction-in-diabetes-mellitus
#10
Aleksandar Kibel, Kristina Selthofer-Relatic, Ines Drenjancevic, Tatjana Bacun, Ivica Bosnjak, Dijana Kibel, Mario Gros
The significance, mechanisms and consequences of coronary microvascular dysfunction associated with diabetes mellitus are topics into which we have insufficient insight at this time. It is widely recognized that endothelial dysfunction that is caused by diabetes in various vascular beds contributes to a wide range of complications and exerts unfavorable effects on microcirculatory regulation. The coronary microcirculation is precisely regulated through a number of interconnected physiological processes with the purpose of matching local blood flow to myocardial metabolic demands...
January 1, 2017: Journal of International Medical Research
https://www.readbyqxmd.com/read/28640960/ferulic-acid-alleviates-symptoms-of-preeclampsia-in-rats-by-upregulating-vascular-endothelial-growth-factor
#11
Weiyan Gong, Jipeng Wan, Qing Yuan, Quanzhan Man, Xiaojing Zhang
Preeclampsia is a complication affecting pregnant women worldwide, which leads to maternal and fetal morbidity and mortality. In this study, we evaluated the efficacy of ferulic acid (FA) on an N(ω) -nitro-L-arginine methyl ester hydrochloride (L-NAME) induced rat model of preeclampsia. L-NAME was administered to pregnant rats to induce preeclampsia. 48 rats were divided into three experimental groups (n=16 each): control group, preeclampsia group and preeclampsia with FA treatment (preeclampsia+FA). Physiological characteristics such as urine volume, total urine protein and blood pressure were assessed...
June 22, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/28640452/role-of-epicardial-adipose-tissue-in-health-and-disease-a-matter-of-fat
#12
Bénédicte Gaborit, Coralie Sengenes, Patricia Ancel, Alexis Jacquier, Anne Dutour
Epicardial adipose tissue (EAT) is a small but very biologically active ectopic fat depot that surrounds the heart. Given its rapid metabolism, thermogenic capacity, unique transcriptome, secretory profile, and simply measurability, epicardial fat has drawn increasing attention among researchers attempting to elucidate its putative role in health and cardiovascular diseases. The cellular crosstalk between epicardial adipocytes and cells of the vascular wall or myocytes is high and suggests a local role for this tissue...
June 18, 2017: Comprehensive Physiology
https://www.readbyqxmd.com/read/28640441/adipose-tissue-derived-omentin-1-function-and-regulation
#13
Takuya Watanabe, Kaho Watanabe-Kominato, Yui Takahashi, Miho Kojima, Rena Watanabe
Omentin-1, also known as intelectin-1, is a recently identified novel adipocytokine of 313 amino acids, which is expressed in visceral (omental and epicardial) fat as well as mesothelial cells, vascular cells, airway goblet cells, small intestine, colon, ovary, and plasma. The level of omentin-1 expression in (pre)adipocytes is decreased by glucose/insulin and stimulated by fibroblast growth factor-21 and dexamethasone. Several lines of experimental evidence have shown that omentin-1 plays crucial roles in the maintenance of body metabolism and insulin sensitivity, and has anti-inflammatory, anti-atherosclerotic, and cardiovascular protective effects via AMP-activated protein kinase/Akt/nuclear factor-κB/mitogen-activated protein kinase (ERK, JNK, and p38) signaling...
June 18, 2017: Comprehensive Physiology
https://www.readbyqxmd.com/read/28639365/vascular-calcification-vitamin-k-and-warfarin-therapy-possible-or-plausible-connection
#14
Aino Siltari, Heikki Vapaatalo
Atherosclerosis is a pathological process underpinning many cardiovascular diseases; it is the main cause of global mortality. Atherosclerosis is characterized by an invasion of inflammatory cells, accumulation of lipids and the formation of fatty streaks (plaques) which subsequently allow accumulation of calcium and other minerals leading to a disturbance in the vascular endothelium and its regulatory role in arterial function. Vascular calcification is a different process, stringently regulated mainly by local factors, in which osteoblast-like cells accumulate in the muscular layer of arteries ultimately taking on the physiological appearance of bone...
June 21, 2017: Basic & Clinical Pharmacology & Toxicology
https://www.readbyqxmd.com/read/28638003/molecular-and-cellular-events-during-blastocyst-implantation-in-the-receptive-uterus-clues-from-mouse-models
#15
Hiromichi Matsumoto
The success of implantation is an interactive process between the blastocyst and the uterus. Synchronized development of embryos with uterine differentiation to a receptive state is necessary to complete pregnancy. The period of uterine receptivity for implantation is limited and referred to as the "implantation window", which is regulated by ovarian steroid hormones. Implantation process is complicated due to the many signaling molecules in the hierarchical mechanisms with the embryo-uterine dialogue. The mouse is widely used in animal research, and is uniquely suited for reproductive studies, i...
June 22, 2017: Journal of Reproduction and Development
https://www.readbyqxmd.com/read/28637872/hydrogen-sulfide-modulates-eukaryotic-translation-initiation-factor-2%C3%AE-eif2%C3%AE-phosphorylation-status-in-the-integrated-stress-response-pathway
#16
Vinita Yadav, Xing-Huang Gao, Belinda Willard, Maria Hatzoglou, Ruma Banerjee, Omer Kabil
Hydrogen sulfide (H2S) regulates various physiological processes including neuronal activity, vascular tone, inflammation, and energy metabolism. Moreover, H2S elicits cytoprotective effects against stressors in various cellular models of injury. However, the mechanism of the signaling pathways mediating the cytoprotective functions of H2S is not well understood. We previously uncovered a heme-dependent metabolic switch for transient induction of H2S production in the transsulfuration pathway. Here, we demonstrate that increased endogenous H2S production or its exogenous administration modulates major components of the integrated stress response (ISR) promoting a metabolic state primed for stress response...
June 21, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28637870/cardiac-myocyte-p38%C3%AE-kinase-regulates-angiogenesis-via-myocyte-endothelial-cell-cross-talk-during-stress-induced-remodeling-in-heart
#17
Beth A Rose, Tomohiro Yokota, Vishnu Chintalgattu, Shuxun Ren, Luisa Iruela-Arispe, Aarif Y Khakoo, Susumu Minamisawa, Yibin Wang
Stress-induced p38 mitogen-activated protein kinase (MAPK) activity is implicated in pathological remodeling in the heart. For example, constitutive p38 MAPK activation in cardiomyocytes induces pathological features, including myocyte hypertrophy, apoptosis, contractile dysfunction, and fetal gene expression. However, the physiological function of cardiomyocyte p38 MAPK activity in beneficial compensatory vascular remodeling is unclear. This report investigated the functional role and the underlying mechanisms of cardiomyocyte p38 MAPK activity in cardiac remodeling induced by chronic stress...
June 21, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28637825/we-know-more-than-we-can-tell-about-diabetes-and-vascular-disease-the-2016-edwin-bierman-award-lecture
#18
Clay F Semenkovich
The Edwin Bierman Award Lecture is presented in honor of the memory of Edwin L. Bierman, MD, an exemplary scientist, mentor, and leader in the field of diabetes, obesity, hyperlipidemia, and atherosclerosis. The award and lecture recognizes a leading scientist in the field of macrovascular complications and contributing risk factors in diabetes. Clay F. Semenkovich, MD, the Irene E. and Michael M. Karl Professor and Chief of the Division of Endocrinology, Metabolism and Lipid Research at Washington University School of Medicine in St...
July 2017: Diabetes
https://www.readbyqxmd.com/read/28637347/mechanisms-underlying-the-long-term-survival-of-the-monocot-dracaena-marginata-under-drought-conditions
#19
Radek Jupa, Roman Plichta, Zuzana Paschová, Nadezhda Nadezhdina, Roman Gebauer
Efficient water management is essential for the survival of vascular plants under drought stress. While interrelations among drought stress, plant anatomy and physiological functions have been described in woody dicots, similar research is very limited for non-palm arborescent and shrubby monocots despite their generally high drought tolerance. In this study, potted transplants of Dracaena marginata Lam. in primary growth stage were exposed to several short- and long-term drought periods. Continuous measurements of sap flow and stem diameter, the evaluation of capacitance and leaf conductance, the quantification of non-structural carbohydrates (NSC), and organ-specific anatomical analyses were performed to reveal the mechanisms promoting plant resistance to limited soil moisture...
June 14, 2017: Tree Physiology
https://www.readbyqxmd.com/read/28634954/3d-anastomosed-microvascular-network-model-with-living-capillary-networks-and-endothelial-cell-lined-microfluidic-channels
#20
Xiaolin Wang, Duc T T Phan, Steven C George, Christopher C W Hughes, Abraham P Lee
This protocol describes detailed practical procedures for generating 3D intact and perfusable microvascular network that connects to microfluidic channels without appreciable leakage. This advanced 3D microvascular network model incorporates different stages of vascular development including vasculogenesis, endothelial cell (EC) lining, sprouting angiogenesis, and anastomosis in sequential order. The capillary network is first induced via vasculogenesis in a middle tissue chamber and then EC linings along the microfluidic channel on either side serve as artery and vein...
2017: Methods in Molecular Biology
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