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https://www.readbyqxmd.com/read/29222239/aging-hematopoiesis-and-the-myelodysplastic-syndromes
#1
REVIEW
Stephen S Chung, Christopher Y Park
The aging hematopoietic system undergoes numerous changes, including reduced production of red blood cells and lymphocytes as well as a relative increase in the production of myeloid cells. Emerging evidence indicates that many of these changes are due to selection pressures from cell-intrinsic and cell-extrinsic factors that result in clonal shifts in the hematopoietic stem cell (HSC) pool, resulting in predominant HSC clones that exhibit the functional characteristics associated with HSC aging. Given the recent descriptions of clonal hematopoiesis in aged populations, the increased risk of developing hematologic malignancies in individuals with clonal hematopoiesis, and the many similarities in hematopoietic aging and acquired bone marrow failure (BMF) syndromes, such as myelodysplastic syndromes (MDS), this raises significant questions regarding the relationship between aging hematopoiesis and MDS, including the factors that regulate HSC aging, whether clonal hematopoiesis is required for the development of MDS, and even whether BMF is an inevitable consequence of aging...
December 8, 2017: Hematology—the Education Program of the American Society of Hematology
https://www.readbyqxmd.com/read/29222227/pings-phone-based-intervention-under-nurse-guidance-after-stroke-interim-results-of-a-pilot-randomized-controlled-trial
#2
Fred Sarfo, Frank Treiber, Mulugeta Gebregziabher, Sheila Adamu, Sachin Patel, Michelle Nichols, Dominic Awuah, Asumadu Sakyi, Nyantakyi Adu-Darko, Arti Singh, Raelle Tagge, Jenkins Carolyn, Bruce Ovbiagele
BACKGROUND AND PURPOSE: Stroke exacts an immense toll in sub-Saharan Africa where there are few resources, and stroke prevention research is limited. The aim of this study is to test the feasibility and preliminary efficacy of an m-Health technology-enabled, nurse-guided intervention in improving blood pressure (BP) control among Ghanaian stroke patients within 1 month of symptom onset. METHODS: We conducted a 2-arm cluster pilot randomized controlled trial involving 60 recent stroke survivors encountered within a single tertiary medical system in Ghana...
December 8, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/29221188/overexpression-of-agt-promotes-bronchopulmonary-dysplasis-via-the-jak-stat-signal-pathway
#3
Lili Shen, Tiancheng Zhang, Hongyan Lu
Angiotensinogen (AGT) is involved in the production of angiotensin II which is the main mediator of action of the rennin-angiotensin system (RAS), whereas the RAS mediates the regulation of sodium homeostasis, blood pressure, and inflammation. The present study aimed to investigate the roles of the AGT in the progression of broncopulmonary dysplasia in premature newborns. By bioinformatics analysis, AGT was found to be the major node in molecular interaction networks of BPD mouse model. Quantitative PCR and western blot analyses were applied to examine AGT expression in A549 cells which were treated with the hyperoxic condition...
November 10, 2017: Oncotarget
https://www.readbyqxmd.com/read/29219620/a-common-humoral-background-of-intraocular-and-arterial-blood-pressure-dysregulation
#4
Janusz Skrzypecki, Iwona Grabska-Liberek, Joanna Przybek, Marcin Ufnal
It has been postulated that intraocular pressure, an important glaucoma risk factor, correlates positively with arterial blood pressure (blood pressure). However, results of experimental and clinical studies are often contradictory. We hypothesize that in some hypertensive patients, disturbances in intraocular pressure regulation may depend on biological effects of blood borne hormones underlying a particular type of hypertension, rather than on blood pressure level itself. This review compares the effects of hormones on blood pressure and intraocular pressure, in order to identify a hormonal profile of hypertensive patients with an increased risk of intraocular pressure surge...
December 8, 2017: Current Medical Research and Opinion
https://www.readbyqxmd.com/read/29215757/hypothalamic-paraventricular-nucleus-neuronal-nitric-oxide-synthase-activity-is-a-major-determinant-of-renal-sympathetic-discharge-in-conscious-wistar-rats
#5
F D McBryde, B H Liu, E V Roloff, S Kasparov, J F R Paton
The paraventricular nucleus of the hypothalamus (PVN) plays a crucial role in cardiovascular and neuroendocrine regulation. Application of nitric oxide donors to the PVN stimulates GABAergic transmission, and may suppress sympathetic nerve activity (SNA) to lower arterial pressure. However, the role of endogenous nitric oxide within PVN in regulating renal SNA chronically remains to be established in conscious animals. To address this, we used our previously established lentiviral vectors to selectively knock down neuronal nitric oxide synthase (nNOS) in the PVN of conscious Wistar rats...
December 7, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/29215742/effects-of-small-interfering-rna-targeting-tlr4-on-expressions-of-adipocytokines-in-obstructive-sleep-apnea-hyponea-syndrome-with-hypertension-in-a-rat-model
#6
Jing-Guo Wu, Nan Xun, Li-Jin Zeng, Zhen-Yu Li, Yan-Bing Liang, Hao Tang, Zhong-Fu Ma
We explored the effects of RNA interference-mediated silencing of TLR4 gene on expressions of adipocytokines in obstructive sleep apnea hyponea syndrome (OSAS) with hypertension in a rat model. Systolic blood pressure of caudal artery and physiological changes were observed when establishing rat models of OSAS with hypertension. Mature rat adipocytes were induced from separated and cultured primary rat adipocytes. To transfect rat mature adipocytes, TLR4 siRNA group and negative control (NC) siRNA group were established...
December 7, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29214462/the-use-of-the-cr-10-scale-to-allow-self-regulation-of-isometric-exercise-intensity-in-pre-hypertensive-and-hypertensive-participants
#7
Niamh M Morrin, Mark R Stone, Ian L Swaine, Keiran J Henderson
PURPOSE: Isometric exercise (IE) has been shown to lower blood pressure (BP). Using equipment with force output displays, intensity is usually regulated at 30% maximal voluntary contraction (MVC); however, the cost of programmable equipment and their requirement for maximal contractions presents limitations. A simple, cost-effective alternative deserves investigation. The purpose of this study was (1) to explore the relationship between %MVC, change in systolic BP (ΔSBP), and perceived exertion (CR-10) and (2) to assess the validity of self-regulation of intensity during isometric hand-grip exercise...
December 6, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29213129/deep-tissue-analysis-of-distal-aqueous-drainage-structures-and-contractile-features
#8
Jose M Gonzalez, Minhee K Ko, Young-Kwon Hong, Robert Weigert, James C H Tan
Outflow resistance in the aqueous drainage tract distal to trabecular meshwork is potentially an important determinant of intraocular pressure and success of trabecular bypass glaucoma surgeries. It is unclear how distal resistance is modulated. We sought to establish: (a) multimodal 2-photon deep tissue imaging and 3-dimensional analysis of the distal aqueous drainage tract (DT) in transgenic mice in vivo and ex vivo; (b) criteria for distinguishing the DT from blood and lymphatic vessels; and (c) presence of a DT wall organization capable of contractility...
December 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29212671/influence-of-age-and-gender-on-the-phase-and-strength-of-the-relation-between-heart-period-and-systolic-blood-pressure-spontaneous-fluctuations
#9
Juliana C Milan-Mattos, Alberto Porta, Natália M Perseguini, Vinicius Minatel, Patricia Rehder-Santos, Anielle C M Takahashi, Stela M Mattiello, Aparecida M Catai
Aging affects baroreflex regulation. The effect of senescence on baroreflex control was assessed from spontaneous fluctuations of heart period (HP) and systolic arterial pressure (SAP) through the HP-SAP gain, while the HP-SAP phase and strength are usually disregarded. This study checks whether the HP-SAP phase and strength, as estimated respectively via the phase of the HP-SAP cross-spectrum (PhHP-SAP) and squared coherence function (K2HP-SAP), varies with age in healthy individuals and trends are gender-dependent...
December 6, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29211322/perivascular-adipose-tissue-and-the-dynamic-regulation-of-kv-7-and-kir-channels-implications-to-resistant-hypertension
#10
Maik Gollasch, Donald G Welsh, Rudolf Schubert
Resistant hypertension is defined as high blood pressure that remains uncontrolled despite treatment with at least three antihypertensive drugs at adequate doses. Resistant hypertension is an increasingly common clinical problem in older age, obesity, diabetes, sleep apnea, and chronic kidney disease. Although the direct vasodilator minoxidil was introduced in the early 1970s, only recently has this drug been shown to be particularly effective in a subgroup of patients with treatment-resistant or uncontrolled hypertension...
December 6, 2017: Microcirculation: the Official Journal of the Microcirculatory Society, Inc
https://www.readbyqxmd.com/read/29208700/hypertension-evoked-rhoa-activity-in-vascular-smooth-muscle-cells-requires-rgs5
#11
Caroline Arnold, Eda Demirel, Anja Feldner, Guillem Genové, Hangjun Zhang, Carsten Sticht, Thomas Wieland, Markus Hecker, Scott Heximer, Thomas Korff
G protein-mediated signaling plays a decisive role in blood pressure regulation and the phenotype of vascular smooth muscle cells (VSMCs); however, the relevance of proteins that restrict G protein activity is not well characterized in this context. Here, we investigated the influence of regulator of G protein signaling 5 (RGS5), an inhibitor of Gαq/11 and Gαi/o activity, on blood pressure and the VSMC phenotype during experimental hypertension. In mice, loss of RGS5 did not affect baseline blood pressure, but prevented hypertension-induced structural remodeling...
December 5, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29208473/role-of-%C3%AE-2-and-%C3%AE-3-adrenoceptors-in-arterial-stiffness-in-a-state-of-hypertension
#12
Camille Leblanc, Reza Tabrizchi
An increase in arterial stiffness is associated with a high risk for morbidity and mortality in a state of elevated systemic pressure. The sympathetic nervous system plays an important role in the regulation of vascular tone via activation of β-adrenoceptors. The aim of this investigation was to determine the involvement of β-adrenoceptors in the control of arterial stiffness in a state of hypertension versus normotension. Pulse wave velocity (PWV), an index of vascular stiffness, was assessed in isoflurane-anaesthetized 13-14-week-old male spontaneously hypertensive (SH) and Wistar-Kyoto (WKY) rats...
December 2, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29207251/oral-contraceptives-modulate-the-muscle-metaboreflex-in-healthy-young-women
#13
Hanna R Parmar, Jasmin Sears, Yannick Molgat-Seon, Cara L McCulloch, Laura A McCracken, Courtney V Brown, Andrew William Sheel, Paolo B Dominelli
There are known sex-differences in blood pressure regulation. The differences are related to ovarian hormones that influence β-adrenergic receptors and the transduction of muscle sympathetic nerve activity. Oral contraceptives (OC) modulate the ovarian hormonal profile in women and therefore may alter the cardiovascular response. We questioned if OC would alter the absolute pressor response to static exercise and influence the day-to-day variability of the response. Healthy men (n=11) and women (n=19) completed a familiarization day and two experimental testing days...
December 5, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29207167/prazosin-protects-myocardial-cells-against-anoxia-reoxygenation-injury-via-the-extracellular-signal%C3%A2-regulated-kinase-signaling-pathway
#14
Lixin Wang, Yan Xue, Hao Ma, Haiyan Shi, Ling Wang, Xiaozheng Cui
Ischemic heart disease (including coronary arterial atherosclerosis, or vascular cavity stenosis or occlusion) remains the leading cause of disease‑associated mortality worldwide. Prazosin, a receptor blocker of postsynaptic adrenaline, is essential in expanding peripheral arteries, which decreases peripheral vascular resistance, and regulates anti‑hypertensive action. However, the mechanisms underlying the effects of prazosin have not been fully elucidated. The aim of the present study was to investigate the protective effects of prazosin on myocardial cells against anoxia‑reoxygenation injury in a mouse model...
November 28, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29206785/three-weeks-of-overload-training-increases-resting-muscle-sympathetic-activity
#15
Alexandra M Coates, Anthony V Incognito, Jeremy D Seed, Connor J Doherty, Philip J Millar, Jamie F Burr
PURPOSE: Overload training is hypothesized to alter autonomic regulation, though interpretations using indirect measures of heart rate variability are conflicting. The aim of the present study was to examine the effects of overload training on muscle sympathetic nerve activity (MSNA), a direct measure of central sympathetic outflow, in recreational endurance athletes. METHODS: Measurements of heart rate variability, cardiac baroreflex sensitivity (BRS), MSNA (microneurography), and sympathetic BRS were obtained in seventeen healthy triathletes and cyclists after 1-week of reduced training (baseline) and following 3-weeks of either regular (CON, n=7) or overload (OL, n=10) training...
December 2, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29206648/relationship-between-plasma-protein-s-levels-and-apolipoprotein-c-ii-in-japanese-middle-aged-obese-women-and-young-nonobese-women
#16
Yukiko Otsuka, Maiko Ueda, Eri Nakazono, Tomohide Tsuda, Xiuri Jin, Kenta Noguchi, Shihoko Sata, Hitomi Miyazaki, Shimako Abe, Katsumi Imai, Masako Iwamoto, Takashi Masuda, Ririko Moriguchi, Shuji Nakano, Hiroko Tsuda
: Protein S, a nonenzymatic cofactor to activated protein C, presents in two forms in plasma, free form and in a complex with C4b-binding protein. The aim of this study was to determine the association of plasma protein S levels with the variables related to cardiovascular disease risk. The relationships between plasma protein S levels with lipids, inflammation markers, and adiposity were first examined on middle-aged obese women (n = 62), then on young nonobese women (n = 160) to verify the findings in the obese women...
December 4, 2017: Blood Coagulation & Fibrinolysis: An International Journal in Haemostasis and Thrombosis
https://www.readbyqxmd.com/read/29203734/effect-of-pioglitazone-on-insulin-resistance-progression-of-atherosclerosis-and-clinical-course-of-coronary-heart-disease
#17
Olha V Skochko, Igor P Kaidashev
INTRODUCTION: Pioglitazone, a medication of thiazolidinedione group, is capable of triggering the peroxisome proliferator-activated receptors (PPAR-γ). Activation of receptor PPAR-γ regulates carbohydrate and lipid metabolism, immune and inflammatory responses in heart tissues. THE AIM: Our aim was to study the effect of pioglitazone on insulin resistance, the clinical course of atherosclerosis and coronary heart disease (CHD). MATERIALS AND METHODS: The study included 43 patients with coronary artery disease...
2017: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/29199405/serum-betatrophin-concentrations-and-the-risk-of-incident-diabetes-a-nested-case-control-study-from-chungju-metabolic-disease-cohort
#18
Seung Hwan Lee, Marie Rhee, Hyuk Sang Kwon, Yong Moon Park, Kun Ho Yoon
BACKGROUND: Betatrophin is a newly identified hormone derived from the liver and adipose tissue, which has been suggested to regulate glucose and lipid metabolism. Circulating levels of betatrophin are altered in various metabolic diseases, although the results are inconsistent. We aimed to examine whether betatrophin is a useful biomarker in predicting the development of diabetes. METHODS: A nested case-control study was performed using a prospective Chungju Metabolic disease Cohort Study...
November 3, 2017: Diabetes & Metabolism Journal
https://www.readbyqxmd.com/read/29198725/circadian-clock-mediated-regulation-of-blood-pressure
#19
REVIEW
Lauren G Douma, Michelle L Gumz
Most bodily functions vary over the course of a 24 hour day. Circadian rhythms in body temperature, sleep-wake cycles, metabolism, and blood pressure (BP) are just a few examples. These circadian rhythms are controlled by the central clock in the suprachiasmatic nucleus (SCN) of the hypothalamus and peripheral clocks located throughout the body. Light and food cues entrain these clocks to the time of day and this synchronicity contributes to the regulation of a variety of physiological processes with effects on overall health...
November 30, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/29198723/dna-methylation-analysis-identifies-loci-for-blood-pressure-regulation
#20
Melissa A Richard, Tianxiao Huan, Symen Ligthart, Rahul Gondalia, Min A Jhun, Jennifer A Brody, Marguerite R Irvin, Riccardo Marioni, Jincheng Shen, Pei-Chien Tsai, May E Montasser, Yucheng Jia, Catriona Syme, Elias L Salfati, Eric Boerwinkle, Weihua Guan, Thomas H Mosley, Jan Bressler, Alanna C Morrison, Chunyu Liu, Michael M Mendelson, André G Uitterlinden, Joyce B van Meurs, Oscar H Franco, Guosheng Zhang, Yun Li, James D Stewart, Joshua C Bis, Bruce M Psaty, Yii-Der Ida Chen, Sharon L R Kardia, Wei Zhao, Stephen T Turner, Devin Absher, Stella Aslibekyan, John M Starr, Allan F McRae, Lifang Hou, Allan C Just, Joel D Schwartz, Pantel S Vokonas, Cristina Menni, Tim D Spector, Alan Shuldiner, Coleen M Damcott, Jerome I Rotter, Walter Palmas, Yongmei Liu, Tomáš Paus, Steve Horvath, Jeffrey R O'Connell, Xiuqing Guo, Zdenka Pausova, Themistocles L Assimes, Nona Sotoodehnia, Jennifer A Smith, Donna K Arnett, Ian J Deary, Andrea A Baccarelli, Jordana T Bell, Eric Whitsel, Abbas Dehghan, Daniel Levy, Myriam Fornage
Genome-wide association studies have identified hundreds of genetic variants associated with blood pressure (BP), but sequence variation accounts for a small fraction of the phenotypic variance. Epigenetic changes may alter the expression of genes involved in BP regulation and explain part of the missing heritability. We therefore conducted a two-stage meta-analysis of the cross-sectional associations of systolic and diastolic BP with blood-derived genome-wide DNA methylation measured on the Infinium HumanMethylation450 BeadChip in 17,010 individuals of European, African American, and Hispanic ancestry...
November 30, 2017: American Journal of Human Genetics
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