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https://www.readbyqxmd.com/read/29351580/maternal-nutrient-restriction-impairs-young-adult-offspring-ovarian-signaling-resulting-in-reproductive-dysfunction-and-follicle-loss
#1
K A Chan, P A Jazwiec, W Gohir, J J Petrik, D M Sloboda
Reproductive abnormalities are included as health complications in offspring exposed to poor prenatal nutrition. We have previously shown in a rodent model, that offspring born to nutrient restriction during pregnancy are born small, enter puberty early, and display characteristics of early ovarian aging as adults. The present study investigated whether key proteins involved in follicle recruitment and growth mediate ovarian follicle loss. Pregnant rats were randomized to: a standard diet throughout pregnancy and lactation (CON), or a calorie-restricted (50% of control) diet (UN) during pregnancy...
January 17, 2018: Biology of Reproduction
https://www.readbyqxmd.com/read/29351577/effects-of-excess-thromboxane-a2-on-placental-development-and-nutrient-transporters-in-a-mus-musculus-model-of-fetal-growth-restriction
#2
Karen J Gibbins, Katherine N Gibson-Corley, Ashley S Brown, Matthew Wieben, Richard C Law, Camille M Fung
Hypertensive disease of pregnancy (HDP) with placental insufficiency is the most common cause of fetal growth restriction (FGR) in the developed world. Despite the known negative consequences of HDP both to the mother and fetus, little is known about the longitudinal placental changes that occur as HDP progresses in pregnancy. This is because longitudinal sampling of human placentae during each gestation is impossible. Therefore, using a mouse model of thromboxane A2-analog infusion to mimic human HDP in the last trimester, we calculated placental efficiencies based on fetal and placental weights, quantified spongiotrophoblast and labyrinth thicknesses and vascular density within these layers, examined whether hypoxia signaling pathway involving vascular endothelial growth factor A (VEGFA) and its receptors (VEGFR1, VEGFR2) and matrix metalloproteinases (MMPs) contributed to vascular change, and examined nutrient transporter abundance including glucose transporters 1 and 3 (GLUT1, GLUT3), neutral amino acid transporters 1, 2, and 4 (SNAT1, SNAT2, and SNAT4), fatty acid transporters 2 and 4 (FATP2, FATP4) and fatty acid translocase (CD36) from embryonic day 15...
January 17, 2018: Biology of Reproduction
https://www.readbyqxmd.com/read/29351513/neuroimmune-interactions-from-the-brain-to-the-immune-system-and-vice-versa
#3
Robert Dantzer
Because of the compartmentalization of disciplines that shaped the academic landscape of biology and biomedical sciences in the past, physiological systems have long been studied in isolation from each other. This has particularly been the case for the immune system. As a consequence of its ties with pathology and microbiology, immunology as a discipline has largely grown independently of physiology. Accordingly, it has taken a long time for immunologists to accept the concept that the immune system is not self-regulated but functions in close association with the nervous system...
January 1, 2018: Physiological Reviews
https://www.readbyqxmd.com/read/29351505/helping-mediating-and-gaining-recognition-the-everyday-identity-work-of-romanian-health-social-workers
#4
Alexandra Ciocănel, Florin Lazăr, Shari Munch, Cara Harmon, Georgiana-Cristina Rentea, Daniela Gaba, Anca Mihai
Health social work is a field with challenges, opportunities, and ways of professing social work that may vary between different national contexts. In this article, we look at how Romanian health social workers construct their professional identity through their everyday identity work. Drawing on a qualitative study based on interviews with 21 health social workers working in various organizational contexts, we analyze what health social workers say they do and how this shapes their self-conception as professionals...
January 19, 2018: Social Work in Health Care
https://www.readbyqxmd.com/read/29351487/contribution-of-parasympathetic-muscarinic-augmentation-of-insulin-secretion-to-olanzapine-induced-hyperinsulinemia
#5
Michael R Rickels, Elys M Perez, Amy J Peleckis, Erica Alshehabi, Huong-Lan Nguyen, Darko Stefanovski, Karl Rickels, Karen L Teff
Atypical antipsychotic drugs have been associated with the development of obesity and diabetes. In particular, olanzapine can induce peripheral insulin resistance and compensatory hyperinsulinemia independent of weight gain or psychiatric disease. To determine if this compensatory increase in insulin is mediated by parasympathetic muscarinic stimulation, we randomized fifteen healthy subjects 2:1 to receive double-blind olanzapine or placebo for 9 days under diet and activity controlled inpatient conditions...
December 19, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29351486/different-physiological-roles-of-insulin-receptors-in-mediating-nutrient-metabolism-in-zebrafish
#6
Bin-Yuan Yang, Gang Zhai, Yu-Long Gong, Jing-Zhi Su, Xu-Yan Peng, Guo-Hui Shang, Dong Han, Jun-Yan Jin, Hao-Kun Liu, Zhen-Yu Du, Zhan Yin, Shou-Qi Xie
Insulin, the most potent anabolic hormone, is critical for somatic growth and metabolism in vertebrates. Type 2 diabetes, which is the primary cause of hyperglycemia, results from an inability of insulin to signal glycolysis and gluconeogenesis. Our previous study showed that double knockout of insulin receptor a (insra) and b (insrb) caused β-cell hyperplasia and lethality from 5 dpf to 16 dpf. In this study, we characterized the physiological roles of Insra and Insrb, in somatic growth and fueling metabolism, respectively...
December 19, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29351480/mechanistically-different-effects-of-fat-and-sugar-on-insulin-resistance-hypertension-and-gut-microbiota-in-rats
#7
Sara Ramos-Romero, Mercè Hereu, Lidia Atienza, Josefina Casas, Olga Jáuregui, Susana Amézqueta, Gabriel Dasilva, Isabel Medina, Maria Rosa Nogués, Marta Romeu, Josep Lluís Torres
Insulin resistance (IR) and impaired glucose tolerance (IGT) are the first manifestations of diet-induced metabolic alterations leading to type-2 diabetes, while hypertension is the deadliest risk factor of cardiovascular disease. The roles of dietary fat and fructose in the development of IR, IGT and hypertension are controversial. We tested the long-term effects of an excess of fat or sucrose (fructose/glucose) on healthy male Wistar Kyoto (WKY) rats. Fat affects IR and IGT earlier than fructose through low-grade systemic inflammation evidenced by liver inflammatory infiltration, increased levels of plasma interleukin-6, prostaglandin E2 and reduced levels of protective short-chain fatty acids without triggering hypertension...
January 2, 2018: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29351473/sympathetically-mediated-cardiac-responses-to-isolated-muscle-metaboreflex-activation-following-exercise-are-modulated-by-body-position-in-humans
#8
André L Teixeira, Mauricio Daher, Mayara Souza, Plinio Santos Ramos, James P Fisher, Lauro C Vianna
Isolated muscle metaboreflex activation with post-handgrip exercise ischemia (PEI) increases sympathetic nerve activity and partially maintains the exercise-induced increase in blood pressure, but a smaller heart rate (HR) response occurs. The cardiopulmonary baroreceptors, mechanically sensitive receptors that respond to changes in central blood volume and pressure, are strongly associated with changes in body position and upon activation elicit reflex sympathoinhibition. Here, we tested the hypothesis that postural changes modulate the sympathetically-mediated cardiac response to PEI in humans...
December 15, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29351469/inhibition-of-mtor-protects-the-blood-brain-barrier-in-models-of-alzheimer-s-disease-and-vascular-cognitive-impairment
#9
Candice E Van Skike, Jordan B Jahrling, Angela B Olson, Naomi L Sayre, Stacy A Hussong, Zoltan I Ungvari, James D Lechleiter, Veronica Galvan
An intact blood-brain barrier (BBB) limits entry of pro-inflammatory and neurotoxic blood-derived factors into the brain parenchyma. The BBB is damaged in Alzheimer's disease (AD), which contributes significantly to the progression of AD pathologies and cognitive decline. However, the mechanisms underlying BBB breakdown in AD remain elusive and no interventions are available for treatment or prevention. We and others recently established that inhibition of the mammalian/mechanistic target of rapamycin (mTOR) pathway with rapamycin yields significant neuroprotective effects, improving cerebrovascular and cognitive function in mouse models of AD...
December 22, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29351468/gabaergic-contribution-to-the-muscle-mechanoreflex-mediated-heart-rate-responses-at-the-onset-of-exercise-in-humans
#10
André L Teixeira, Plinio Santos Ramos, Milena Samora, Jeann L Sabino-Carvalho, Djalma Rabelo Ricardo, Eduardo Colombari, Lauro C Vianna
Previous studies indicated that central GABAergic mechanisms are involved in the heart rate (HR) responses at the onset of exercise. Based on previous research that showed similar increases in HR during passive and active cycling, we reasoned that the GABAergic mechanisms involved in the HR responses at the exercise onset is primarily mediated by muscle mechanoreceptors afferents. Therefore, in this study we sought to determine if central GABA mechanisms are involved in the muscle mechanoreflex-mediated HR responses at the onset of exercise in humans...
December 22, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29351465/emerging-potential-benefits-of-modulating-nad-metabolism-in-cardiovascular-disease
#11
Daniel S Matasic, Charles Brenner, Barry London
Nicotinamide adenine dinucleotide (NAD+) and related metabolites are central mediators of fuel oxidation and bioenergetics within cardiomyocytes. Additionally, NAD+ is required for the activity of multifunctional enzymes including sirtuins and poly(ADP-ribose) polymerases (PARPs) that regulate post-translational modifications, DNA damage responses, and calcium signaling. Recent research indicates that NAD+ participates in a multitude of processes dysregulated in cardiovascular diseases. Therefore, supplementation of NAD+ precursors including nicotinamide riboside (NR) that boost or replete the NAD+ metabolome may be cardioprotective...
December 22, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29351462/maximal-strength-training-induced-improvements-in-forearm-work-efficiency-are-associated-with-reduced-blood-flow
#12
Ole Kristian Berg, Stian Kwak Nyberg, Tobias Midtvedt Windedal, Eivind Wang
Maximal strength training (MST) improves work efficiency. However, since blood flow is greatly dictated by muscle contractions in arms during exercise, and vascular conductance is lower, it has been indicated that arms rely more upon adapting oxygen extraction than legs in response to the enhanced work efficiency. Thus, to investigate if metabolic and vascular responses are arm-specific, we utilized Doppler-ultrasound and a catheter placed in the subclavian vein to measure blood flow and a-vO2diff during steady state work in seven young males (24{plus minus}3(SD) years) following six-weeks of handgrip MST...
December 29, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29351460/macrophage-dependent-impairment-of-%C3%AE-2-adrenergic-autoreceptor-function-in-sympathetic-neurons-from-doca-salt-but-not-high-fat-diet-induced-hypertensive-rats
#13
Ryan Kwun-Yee Mui, Roxanne Fernandes, Hannah Garver, Nico van Rooijen, James J Galligan
DOCA-salt and obesity-related hypertension are associated with inflammation and sympathetic nervous system hyperactivity. Prejunctional α2-adrenergic receptors (α2ARs) provide negative feedback to norepinephrine release from sympathetic nerves through inhibition of N-type Ca2+ channels. Increased neuronal norepinephrine release in DOCA-salt and obesity-related hypertension occurs through impaired α2AR signaling, however, the mechanisms involved are unclear. Mesenteric arteries are resistance arteries that receive sympathetic innervation from the superior mesenteric and celiac ganglia (SMCG)...
January 5, 2018: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29351457/important-role-of-endothelium-dependent-hyperpolarization-in-pulmonary-microcirculation-in-male-mice-implications-for-hypoxia-induced-pulmonary-hypertension
#14
Shuhei Tanaka, Takashi Shiroto, Shigeo Godo, Hiroki Saito, Yosuke Ikumi, Akiyo Ito, Shoko Kajitani, Saori Sato, Hiroaki Shimokawa
Endothelium-dependent hyperpolarization (EDH) plays important roles in systemic circulation, whereas its role in pulmonary circulation remains largely unknown. Furthermore, the underlying mechanisms of pulmonary hypertension (PH) also remain to be elucidated. We thus aimed to elucidate the role of EDH in pulmonary circulation in general and in PH in particular. In isolated perfused lung using male wild-type mice, endothelium-dependent relaxations to bradykinin (BK) were significantly reduced in the presence of Nω-nitro-L-arginine (L-NNA) by ~50% as compared with those in the presence of indomethacin, and the combination of apamin plus charybdotoxin abolished the residual relaxations, showing the comparable contributions of nitric oxide (NO) and EDH in pulmonary microcirculation under physiological conditions...
January 5, 2018: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29351453/superoxide-inhibition-restores-endothelium-dependent-dilatation-in-aging-arteries-by-enhancing-impaired-adherens-junctions
#15
Fumin Chang, Sheila Flavahan, Nicholas A Flavahan
Endothelium-dependent, nitric oxide (NO)-mediated dilatation is impaired in aging arteries. The dysfunction reflects increased production of reactive oxygen species (ROS), is reversed by inhibiting superoxide with superoxide dismutase (SOD) mimics, and is assumed to reflect superoxide-mediated inactivation of NO. However, the dysfunction also reflects Src-dependent degradation and loss of VE-cadherin from adherens junctions, resulting in a selective impairment in the ability of the junctions to amplify endothelial dilatation...
January 12, 2018: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29351452/the-role-of-intracellular-angiotensin-ii
#16
Richard N Re
It has become clear that the vasoactive peptide angiotensin II, like other so-called intracrines, can act in the intracellular space. Evidence has accumulated indicating that such angiotensin II activity can be upregulated in disease states and cause pathology. Indeed, other intracrines appear to be involved in disease pathogenesis as well. At the same time nitric oxide, potentially a cell protective factor, has been shown to be upregulated by intracellular angiotensin II. Recently data has been developed indicating that other potentially protective factors are directly upregulated at neuronal nuclei by angiotensin II...
January 12, 2018: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29351448/extracellular-oxidation-in-cystic-fibrosis-airway-epithelium-causes-enhanced-egfr-adam17-activity
#17
Marta Stolarczyk, Guido Veit, Andrea Schnur, Mieke Veltman, Gergely L Lukacs, Bob J Scholte
The EGFR/ADAM17 signaling pathway mediates the shedding of growth factors and secretion of cytokines, and is involved in chronic inflammation and tissue remodeling. Since these are hallmarks of cystic fibrosis (CF) lung disease, we hypothesized that CFTR deficiency enhances EGFR/ADAM17 activity in human bronchial epithelial cells. In CFBE41o- cells lacking functional CFTR (iCFTR-) cultured at air-liquid interface (ALI) we found enhanced ADAM17-mediated shedding of the EGFR ligand amphiregulin (AREG) compared to genetically identical cells with induced CFTR expression (iCFTR+)...
December 14, 2017: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/29351447/cigarette-smoke-dampens-anti-viral-signaling-in-small-airway-epithelial-cells-by-disrupting-tlr3-cleavage
#18
Parker F Duffney, Claire E McCarthy, Aitor Nogales, Thomas H Thatcher, Luis Martinez-Sobrido, Richard P Phipps, Patricia J Sime
Cigarette smokers and people exposed to secondhand smoke are at an increased risk for pulmonary viral infections, yet the mechanism responsible for this heightened susceptibility is not understood. To understand the effect of cigarette smoke on susceptibility to viral infection we used an air-liquid interface culture system, and exposed primary human small airway epithelial cells (SAEC) to whole cigarette smoke followed by treatment with the viral mimetic polyinosinic polycytidylic acid (poly I:C) or influenza A virus (IAV)...
December 14, 2017: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/29351439/role-of-reactive-oxygen-species-and-sulfide-quinone-oxoreductase-in-hydrogen-sulfide-induced-contraction-of-rat-pulmonary-arteries
#19
Jesus Prieto-Lloret, Vladimir A Snetkov, Yasin Shaifta, Inmaculada Docio, Michelle J Connolly, Charles E Mackay, Greg A Knock, Jeremy Pt Ward, Philip I Aaronson
Application of H2S ('sulfide') elicits a complex contraction in rat pulmonary arteries (PA) comprising a small transient contraction (phase 1; Ph1) followed by relaxation and then a second, larger, and more sustained contraction (phase 2; Ph2). We investigated the mechanisms causing this response using isometric myography in rat second order PA, with Na2S as a sulfide donor. Both phases of contraction to 1000μM Na2S were attenuated by the pan-PKC inhibitor Gö6983 (3μM) and by 50μM ryanodine; the Ca2+ channel blocker nifedipine (1μM) was without effect...
December 28, 2017: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/29351435/effects-of-cigarette-smoke-on-pulmonary-endothelial-cells
#20
Qing Lu, Eric Gottlieb, Sharon Rounds
Cigarette smoking is the leading cause of preventable disease and death in the US. Cardiovascular co-morbidities associated with both active and secondhand cigarette smoking indicate the vascular toxicity of smoke exposure. Growing evidence supports the injurious effect of cigarette smoke on pulmonary endothelial cells and the roles of endothelial cell injury in development of Acute Respiratory Distress Syndrome (ARDS), emphysema, and pulmonary hypertension. This review summarizes results from studies of humans, preclinical animal models, and cultured endothelial cells that document toxicities of cigarette smoke exposure on pulmonary endothelial cell functions, including barrier dysfunction, endothelial activation and inflammation, apoptosis, and vasoactive mediator production...
January 4, 2018: American Journal of Physiology. Lung Cellular and Molecular Physiology
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