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American Journal of Physiology. Regulatory, Integrative and Comparative Physiology

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https://www.readbyqxmd.com/read/29341830/pregnancy-related-hormones-progesterone-and-human-chorionic-gonadotrophin-upregulate-expression-of-maternal-plasma-gelsolin
#1
Renu Garg, Nagesh Peddada, Kunzes Dolma, Neeraj Khatri, Ashish Ashish
Plasma gelsolin (pGSN), a protein primarily involved in clearance of circulating actin filaments, is an upcoming novel biomarker. Its level changes in multiple disease and injury conditions, attributable mainly to its consumption during actin clearance, the endogenous regulation of its expression, however, remains elusive as well as unexplored. Here, we are reporting first isolation of the promoter region of pGSN gene and investigation of its transcriptional regulation during pregnancy (a natural process associated with a well programmed injury course of parturition)...
January 17, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29341829/climatic-modulation-of-neurotransmitter-release-in-amphibian-neuromuscular-junctions-role-of-dynorphin-a
#2
Dengyun Ge, Nickolas Anastasios Lavidis
Amphibian neuromuscular junctions become relatively more silent during the dry-winter season in Australia. Endogenous opioid peptides play an important role in the regulation of the physiological functions of active and dormant vertebrates. Previous findings suggest that dynorphin-A is more potent than other opiates in decreasing evoked neurotransmission in amphibian neuromuscular junctions. Dynorphin-A has been shown not to alter the amplitude or the frequency of spontaneous quantal neurotransmitter release...
January 17, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29341828/biosensors-for-spatiotemporal-detection-of-reactive-oxygen-species-in-cells-and-tissues
#3
Marie Erard, Sophie Dupre-Crochet, Oliver Nusse
Redox biology has become a major issue in numerous areas of physiology. Reactive oxygen species (ROS) have a broad range of roles from signal transduction to growth control and cell death. To understand the nature of these roles, accurate measurement of the reactive compounds is required. An increasing number of tools for ROS detection is available; however, specificity and sensitivity of these tools are often insufficient. Furthermore, their specificity has been rarely evaluated in complex physiological conditions...
January 17, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29341827/editorial-focus-multitasking-a-challenge-for-the-kidney-focus-on-red-blood-cell-antibody-induced-anemia-causes-differential-degrees-of-tissue-hypoxia-in
#4
Jennifer P Ngo, Roger G Evans
No abstract text is available yet for this article.
January 17, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29341826/mu-opioid-receptors-inhibit-the-exercise-pressor-reflex-by-closing-n-type-calcium-channels-but-not-by-opening-girk-channels-in-rats
#5
Juan A Estrada, Marc P Kaufman
Mu opioid G-protein coupled receptors (MOR) interact with ion channels to decrease neuronal excitability. In humans, intrathecal administration of the MOR agonist, fentanyl, inhibits the exercise pressor reflex, an effect that can be attributed to either the opening of inward rectifying potassium channels (GIRK) or the closing of N-type calcium channels. The purpose of this study was to determine if the highly selective MOR agonist DAMGO attenuates the exercise pressor reflex, and which of these two channels are responsible for this effect...
January 17, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29341825/a-predictive-model-of-rats-calorie-intake-as-a-function-of-diet-energy-density
#6
Rahmatollah Beheshti, Yada Treesukosol, Takeru Igusa, Timothy H Moran
Easy access to high-energy food has been linked to high rates of obesity in the world. Understanding the way that access to palatable (high fat or high calorie) food can lead to overconsumption is essential for both preventing and treating obesity. Although the body of studies focused on the effects of high energy diets is growing, our understanding of how different factors contribute to food choices is not complete. In this study, we present a mathematical model that can predict rats' calorie intake to a high-energy diet based on their ingestive behavior to a standard chow diet...
January 17, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29341824/intestinal-lymph-as-a-readout-of-meal-induced-glp-1-release-in-an-unrestrained-rat-model
#7
Nino Jejelava, Sharon Kaufman, Jean-Philippe Krieger, Marcella Martins Terra, Wolfgang Langhans, Myrtha Arnold
Intestinal lymph supposedly provides a readout for the secretion of intestinal peptides. We here assessed how mesenteric lymph duct (MLD) lymph levels of glucagon-like peptide (GLP-1), insulin, and metabolites (Glucose, triglycerides [TG]) evolve after isocaloric high and low fat diet (HFD, LFD) meals, and how they compare to hepatic portal vein (HPV) plasma levels. Moreover, we examined the effects of intraperitoneally (IP) administered GLP-1 (1 or 10 nmol/kg) on these parameters. At 20 min after the HFD meal onset, GLP-1 levels were higher in MLD lymph than in HPV plasma...
January 17, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29351419/maternal-nutrient-restriction-in-guinea-pigs-as-an-animal-model-for-studying-growth-restricted-offspring-with-post-natal-catch-up-growth
#8
Catherine L Nevin, Evan Formosa, Yohei Maki, Brad Matushewski, Timothy R H Regnault, Bryan S Richardson
We determined the impact of moderate maternal nutrient restriction (MNR) in guinea pigs with fetal growth restriction (FGR) on offspring body and organ weights, hypothesizing that FGR-MNR animals will show catch-up growth, but with organ-specific differences. Guinea pig sows were fed ad libitum (Control) or 70% of the control diet from 4 week`s pre-conception, switching to 90% at mid-pregnancy (MNR). Control newborns >95g (appropriate for gestational age or AGA, N=37) and MNR newborns <85g (FGR, N=37) were monitored until neonatal (~25 days) or adult (~110 days) necropsy...
January 10, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29351418/red-blood-cell-antibody-induced-anemia-causes-differential-degrees-of-tissue-hypoxia-in-kidney-and-brain
#9
Nikhil Mistry, C David Mazer, John G Sled, Alan H Lazarus, Lindsay S Cahill, Max Solish, Yu-Qing Zhou, Nadya Romanova, Alexander Gm Hare, Allan Doctor, Joseph A Fisher, Keith R Brunt, Jeremy A Simpson, Gregory M T Hare
Moderate anemia is associated with increased mortality and morbidity, including acute kidney injury (AKI), in surgical patients. A red blood cell (RBC)-specific antibody model was utilized to determine if moderate subacute anemia could result in tissue hypoxia as a potential mechanism of injury. Cardiovascular and hypoxic cellular responses were measured in transgenic mice capable of expressing hypoxia-inducible factor-1α (HIF-1α)-luciferase activity in vivo. Antibody-mediated anemia was associated with mild intravascular hemolysis (6 hours) and splenic RBC sequestration (day 4), resulting in a nadir hemoglobin concentration of 89{plus minus}13 g/L at day 4...
January 10, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29351424/clocking-skin-sodium-focus-on-diurnal-patterns-in-skin-sodium-and-water-content-is-associated-with-salt-sensitive-hypertension-in-etb-receptor-deficient-rats
#10
Michelle L Gumz
No abstract text is available yet for this article.
January 3, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29351423/role-of-trpv1-in-acupuncture-modulation-of-reflex-excitatory-cardiovascular-responses
#11
Zhi-Ling Guo, Liang-Wu Fu, Hou-Fen Su, Stephanie C Tjen-A-Looi, John C Longhurst
Acupuncture, including manual and electroacupuncture (MA and EA), at the P5-6 acupoints stimulates afferents in the median nerve (MN) to modulate sympathoexcitatory cardiovascular reflexes. Transient receptor potential vanilloid type-1 (TRPV1) is present in afferents distributed in the region of acupoints. However, contribution of TRPV1 to activation of sensory nerves by acupuncture, leading to modulation of pressor responses has not been studied. We hypothesized that TRPV1 participates in acupuncture's activation of sensory fibers and neurons to modulate pressor reflexes...
January 3, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29351422/body-mass-specific-na-k-atpase-activity-in-the-medullary-thick-ascending-limb-implications-for-species-dependent-urine-concentrating-mechanisms
#12
Mun Aw, Tamara M Armstrong, C Michele Nawata, Sarah N Bodine, Jeeeun J Oh, Guojun Wei, Kristen K Evans, Mohammad Shahidullah, Timo Rieg, Thomas L Pannabecker
In general, mammalian whole body mass-specific metabolic rate correlates positively with maximal urine concentration (Umax) irrespective of whether or not the species have adapted to arid or mesic habitat. Accordingly, we hypothesized that the thick ascending limb (TAL) of a rodent with markedly higher whole body mass-specific metabolism than rat exhibits a substantially higher TAL metabolic rate as estimated by Na+, K+-ATPase activity and Na+, K+-ATPase α1 gene and protein expression. The kangaroo rat inner stripe of the outer medulla exhibits significantly higher mean Na+, K+-ATPase activity (~70%) compared to 2 rat strains (Sprague-Dawley and Munich-Wistar), extending prior studies showing rat activity exceeds rabbit...
January 3, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29351421/increased-insulin-clearance-in-mice-with-double-deletion-of-glucagon-like-peptide-1-and-glucose-dependent-insulinotropic-polypeptide-receptors
#13
Andrea Tura, Roberto Bizzotto, Yuichiro Yamada, Yutaka Seino, Giovanni Pacini, Bo Ahren
To establish whether incretin hormones affect insulin clearance, the aim of this study was to assess insulin clearance in mice with genetic deletion of receptors for both glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP), so called double incretin receptor knockout mice (DIRKO). DIRKO (n=31) and wild-type (WT) C57BL6J mice (n=45) were intravenously injected with D-glucose (0.35 g/kg). Blood was sampled for 50 minutes and assayed for glucose, insulin and C-peptide. Data were modeled to calculate insulin clearance; C-peptide kinetics was established after human C-peptide injection...
January 3, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29351420/fourth-ventricular-tsh-induces-satiety-and-increases-body-temperature-in-rats
#14
Ulrika Smedh, Karen A Scott, Timothy H Moran
Besides its well-known action to stimulate thyroid hormone release, Thyrotropin mRNA is expressed within the brain and Thyrotropin and its receptor have been shown to be present in brain areas that control feeding and gastrointestinal function. Here, the hypothesis that Thyrotropin acts on receptors in the dorsal hindbrain to alter food intake and/or gastric function was tested. Fourth ventricular injections of Thyrotropin (0.06, 0.6 and 6.0 µg) were given to rats with chronic intracerebroventricular cannulas aimed at the fourth ventricle...
January 3, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29351425/source-of-dietary-sucrose-influences-development-of-leptin-resistance-in-male-and-female-rats
#15
Ruth B S Harris
Male rats offered 30% sucrose solution in addition to chow develop leptin resistance without increasing energy intake or body fat. Here we tested whether the leptin resistance was dependent upon the physical form of the sucrose. Sprague Dawley rats were offered a sucrose-free diet (NS), a 66.6% energy as sucrose diet (HS), or NS diet and 30% sucrose solution (LS). Sucrose intake of LS rats equaled that of HS rats, but total carbohydrate intake exceeded that of HS rats. After 33 days male and female LS rats were resistant to the inhibitory effect of peripherally administered leptin on food intake...
December 27, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29351430/dynamic-changes-in-nitric-oxide-synthase-expression-are-involved-in-seawater-acclimation-of-rainbow-trout-oncorhynchus-mykiss
#16
Lucie Gerber, Frank B Jensen, Steffen S Madsen
Recent research has shown that nitric oxide (NO) produced by nitric oxide synthases (Nos) is an inhibitor of ion transporter activity and a modulator of epithelial ion transport in fish but little is known on changes in the Nos/NO system during osmotic stress. We hypothesized that the Nos/NO system responds to salinity changes as an integrated part of the acclimation process. Expression and localization of nos1/Nos1 and nos2/Nos2 were investigated in gill, kidney and intestine of FW- and SW-transferred trout using qPCR, Western blotting and immunohistochemistry, along with expressional changes of major ion transporters in the gill...
December 20, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29351429/removal-of-interscapular-brown-adipose-tissue-increases-aortic-stiffness-despite-normal-systemic-glucose-metabolism-in-mice
#17
Zachary Ian Grunewald, Nathan C Winn, Michelle L Gastecki, Makenzie L Woodford, James R Ball, Sarah A Hansen, Harold S Sacks, Victoria J Vieira-Potter, Jaume Padilla
Brown adipose tissue (BAT) is considered protective against obesity and related cardiometabolic dysfunction. Indeed, activation of BAT improves glucose homeostasis and attenuates cardiovascular disease development. However, whether a reduction in BAT mass perturbs metabolic function and increases risk for cardiovascular disease remains largely unknown. To address this question, C57BL/6J male mice underwent sham or surgical bilateral excision of interscapular BAT (iBATx) and were fed a normal chow or Western diet (WD) for 18 weeks, creating four groups (n=10/group)...
December 20, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29351428/control-of-appetite-blood-glucose-and-blood-pressure-during-melanocortin-4-receptor-activation-in-normoglycemic-and-diabetic-npy-deficient-mice
#18
Alexandre A da Silva, John Nathan Freeman, John E Hall, Jussara M do Carmo
Although central melanocortin 4 receptor (MC4R) blockade abolishes the CNS-mediated anorexogenic, antidiabetic and cardiovascular actions of leptin, chronic MC4R stimulation fails to completely mimic leptin's effects. Because neuropeptide Y (NPY) and MC4R exert opposite effects on cardiovascular and metabolic functions, we tested its role in offsetting the long-term actions of MC4R activation. Wild-type (WT) and NPY-deficient (NPY-/-) mice were implanted with telemetry probes for measuring mean arterial pressure (MAP) and heart rate (HR) 24-h/d...
December 20, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29351427/role-of-ptp1b-in-pomc-neurons-during-chronic-high-fat-diet-sex-differences-in-regulation-of-liver-lipids-and-glucose-tolerance
#19
Nicola Aberdein, Robert J Dambrino, Jussara M do Carmo, Zhen Wang, Laura E Mitchell, Heather A Drummond, John E Hall
Protein tyrosine phosphatase 1B (PTP1B) is a negative regulator of leptin receptor signalling and may contribute to leptin resistance in diet-induced obesity. Although PTP1B inhibition has been suggested as a potential weight loss therapy, the role of specific neuronal PTP1B signalling in cardiovascular and metabolic regulation and the importance of sex differences in this regulation are still unclear. In this study, we investigated the impact of pro-opiomelanocortin (POMC) neuronal PTP1B deficiency in cardiometabolic regulation in male and female mice fed a high fat diet (HFD)...
December 20, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29351426/the-effects-of-heat-and-cold-on-health-with-special-reference-to-finnish-sauna-bathing
#20
Ilkka Heinonen, Jari A Laukkanen
Environmental stress such as extremely warm or cold temperature is often considered a challenge to human health and body homeostasis. However, human body can adapt relatively well to heat and cold environments and recent studies have also elucidated that particularly heat stress might be even highly beneficial for human health. Consequently, the aim of the present brief review is first to discuss general cardiovascular and other responses to acute heat stress, followed by a review of beneficial effects of Finnish sauna bathing on general and cardiovascular health and mortality as well as dementia and Alzheimer's disease risk...
December 20, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
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