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American Journal of Physiology. Regulatory, Integrative and Comparative Physiology

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https://www.readbyqxmd.com/read/29141950/maternal-circadian-rhythms-and-the-programming-of-adult-health-and-disease
#1
Tamara Jayne Varcoe, Kathryn L Gatford, David J Kennaway
The in utero environment is inherently rhythmic, with the fetus subjected to circadian changes in temperature, substrates and various maternal hormones. Meanwhile, the fetus is developing an endogenous circadian timing system, preparing for life in an external environment where light, food availability and other environmental factors change predictably and repeatedly every 24 hours. In humans, there are many situations that can disrupt circadian rhythms, including shift work, international travel, insomnias and circadian rhythm disorders (e...
November 15, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29141949/microvascular-insulin-resistance-in-skeletal-muscle-and-brain-occurs-early-in-the-development-of-juvenile-obesity-in-pigs
#2
T Dylan Olver, Zachary Ian Grunewald, Thomas J Jurrissen, Rebecca Ek MacPherson, Paul J LeBlanc, Teagan R Schnurbusch, Alana M Czajkowski, Maurice Harold Laughlin, R Scott Rector, Shawn B Bender, Eric M Walters, Craig A Emter, Jaume Padilla
BACKGROUND: Impaired microvascular insulin signaling may develop prior to overt indices of microvascular endothelial dysfunction and represent an early pathological feature of adolescent obesity. Using a translational porcine model of juvenile obesity, we tested the hypotheses that in the early stages of obesity development, impaired insulin signaling manifests in skeletal muscle (triceps), brain (prefrontal cortex) and corresponding vasculatures, and that depressed insulin-induced vasodilation is reversible with acute inhibition of protein kinase C beta (PKCβ)...
November 15, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29118024/arsenic-exposure-induces-glucose-intolerance-and-alters-global-energy-metabolism
#3
Andrew G Kirkley, Christopher M Carmean, Daniel Ruiz, Honggang Ye, Shane M Regnier, Ananta Poudel, Manami Hara, Wakanene Kamau, Daniel N Johnson, Austin A Roberts, Patrick J Parsons, Susumu Seino, Robert Michael Sargis
Environmental pollutants acting as endocrine disrupting chemicals (EDCs) are recognized as potential contributors to metabolic disease pathogenesis. One such pollutant, arsenic, contaminates the drinking water of approximately 100 million people globally and has been associated with insulin resistance and diabetes in epidemiological studies. Despite these observations, the precise metabolic derangements induced by arsenic remain incompletely characterized. In the present study, arsenic's impact on in vivo metabolic physiology was examined in 8 week old male C57BL/6J mice exposed to 50 mg/L inorganic arsenite in their drinking water for 8 weeks...
November 8, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29118023/the-orchestration-of-autonomous-and-behavioral-thermoregulation
#4
Boris R M Kingma
There seems to be an efficient order in the recruitment of thermo-effectors, which allows for body temperature regulation at minimal cost of nutrients and water. But how does thermal behaviour fit in this order? In this edition Schlader et al. hypothesized that thermal behavior fits in the orderly recruitment of thermo-effectors as follows: 1) vasomotor responses, 2) behavioral responses, and 3) sweating or metabolic responses. Their results support this hypothesis by showing consistently for heating and cooling that non-glabrous skin blood flow changes immediately with changes in skin temperature, followed by the initiation of a behavioral response...
November 8, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29118022/tonic-aortic-depressor-nerve-stimulation-does-not-impede-baroreflex-dynamic-characteristics-concomitantly-mediated-by-the-stimulated-nerve
#5
Toru Kawada, Michael J Turner, Shuji Shimizu, Atsunori Kamiya, Toshiaki Shishido, Masaru Sugimachi
Although electrical activation of the carotid sinus baroreflex (baroreflex activation therapy) is being explored as a device therapy for resistant hypertension, possible effects on baroreflex dynamic characteristics of interaction between electrical stimulation and pressure inputs are not fully elucidated. To examine whether the electrical stimulation of the baroreceptor afferent nerve impedes normal short-term arterial pressure (AP) regulation mediated by the stimulated nerve, we electrically stimulated the right aortic depressor nerve (ADN) while estimating the baroreflex dynamic characteristics by imposing pressure inputs to the isolated baroreceptor region of the right ADN in nine anesthetized rats...
November 8, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29118021/venous-collapse-regulates-intracranial-pressure-in-upright-body-positions
#6
Petter Holmlund, Anders Eklund, Lars-Owe D Koskinen, Elias Johansson, Nina Sundström, Jan Malm, Sara Qvarlander
Recent interest in intracranial pressure (ICP) in the upright posture has revealed that the mechanisms regulating postural changes in ICP are not fully understood. We have suggested an explanatory model where the postural changes in ICP depend on well-established hydrostatic effects in the venous system and where these effects are interrupted by collapse of the internal jugular veins (IJVs) in more upright positions. The aim of this study was to investigate this relationship by simultaneous invasive measurements of ICP, venous pressure and IJV collapse in healthy volunteers...
November 8, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29118020/viscerosensory-input-drives-angiotensin-ii-type-1a-receptor-expressing-neurons-in-the-solitary-tract-nucleus
#7
David A Carter, Haoyao Guo, Angela A Connelly, Jaspreet K Bassi, Angelina Y Fong, Andrew Mark Allen, Stuart James McDougall
Homeostatic regulation of visceral organ function requires integrated processing of neural and neurohormonal sensory signals. The nucleus of the solitary tract (NTS) is the primary sensory nucleus for cranial visceral sensory afferents. Angiotensin II (Ang II) is known to modulate peripheral visceral reflexes, in part, by activating Ang II type 1A receptors (AT1AR) in the NTS. AT1AR-expressing NTS neurons occur throughout the NTS with a defined sub-nuclear distribution and most of these neurons are depolarized by Ang II...
November 8, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29118019/acyloxyacyl-hydrolase-modulates-pelvic-pain-severity
#8
Wenbin Yang, Ryan E Yaggie, Mingchen C Jiang, Charles N Rudick, Joseph D Done, Charles J Heckman, John M Rosen, Anthony J Schaeffer, David J Klumpp
Chronic pelvic pain causes significant patient morbidity and is a bane to clinicians. Using a murine neurogenic cystitis model that recapitulates key aspects of interstitial cystitis/bladder pain syndrome (IC), we recently showed that pseudorabies virus (PRV) induces severe pelvic allodynia in BALB/c mice, relative to C57BL/6 mice. Here, we report that a quantitative trait locus (QTL) analysis of PRV-induced allodynia in F2CxB progeny identified a polymorphism on chromosome 13, rs6314295, significantly associated with allodynia (LOD=3...
November 8, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29118018/th17-cells-contribute-to-pulmonary-fibrosis-and-inflammation-during-chronic-kidney-disease-progression-following-acute-ischemia
#9
Purvi Mehrotra, Jason A Collett, Susan J Gunst, David P Basile
Acute kidney injury (AKI) is associated with high mortality rates and predisposes development of chronic kidney disease (CKD). Distant organ damage, particularly in the lung, may contribute to mortality in AKI patients. Animal models of AKI demonstrate an increase in pulmonary infiltration of lymphocytes and reveal an acute compromise of lung function, but the chronic effects of AKI on pulmonary inflammation are unknown. We hypothesized that in response to renal I/R, there is a persistent systemic increase in Th17 cells with potential effects on pulmonary structure and function...
November 8, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29118017/role-of-immune-factors-in-angiotensin-ii-induced-hypertension-and-renal-damage-in-dahl-salt-sensitive-rats
#10
Brittany Wade, Galina Petrova, David L Mattson
The present study assessed the importance of immunity in AngII (5 ng/kg/min, iv)-mediated hypertension in Dahl Salt Sensitive (SS) rats and SS rats deficient in T- and B-lymphocytes (SS (Rag1-/-)) fed a 0.4% NaCl diet. Baseline mean arterial blood pressure (MAP) was not different between groups. AngII infusion significantly increased MAP in both groups; though MAP increased more rapidly in SS, and the maximal MAP achieved in SS (190±3 mmHg) was significantly greater than that in SS(Rag1-/-) (177±3 mmHg) after 12 days...
November 8, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29092862/editorial-team-changes-in-the-new-year
#11
Willis K Samson
None.
November 1, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29092861/effect-of-dietary-palmitic-and-stearic-acids-on-sucrose-motivation-and-hypothalamic-and-striatal-cell-signals-in-the-rat
#12
Dianne P Figlewicz, Jennifer Jay, Constance H West, Aryana Zavosh, Christiane S Hampe, Jared R Radtke, Murray A Raskind, Elaine R Peskind
e have reported that motivation for sucrose is increased in rats fed a moderate (31%) mixed-fat diet for 4-6 weeks. In this study, rats were fed diets containing 32% stearic (STEAR) or palmitic (PALM) acid, and behavior, metabolic profile, and cell signals were compared with those of rats fed a matched low fat (11% fat [LF]) diet. Rats fed STEAR or PALM increased sucrose motivation relative to LF rats (one-way ANOVA for lever presses, p=.03). Diet did not change fasting glucose, insulin, total cholesterol, triglycerides, intravenous glucose tolerance test glucose profile, percent body fat, or total kcal, although kcal as fat were increased (ANOVA p<0...
November 1, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29092860/exercise-training-reverses-inflammation-and-muscle-wasting-after-tobacco-smoke-exposure
#13
Karsten Krüger, Michael Seimetz, Robert Ringseis, Jochen Wilhelm, Alexandra Pichl, Aline Couturier, Klaus Eder, Norbert Weissmann, Frank C Mooren
Long term cigarette smoking induces inflammatory processes in the pulmonary system which are suggested to "spill over" into systemic inflammation. Regular exercise has been shown to have anti-inflammatory properties. The aim of the study was to investigate the effects of therapeutic exercise on inflammation and muscle wasting in smoke-exposed mice. C57BL/6J-mice (n = 30) were separated into three groups to receive either: (1) controls with no specific treatment (Con group), (2) 8 months exposure to cigarette smoke (smoke-exposed (SE) group), (3) 8 months of cigarette smoke combined with exercise training during the last 2 months (SEex group)...
November 1, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29092859/urinary-bladder-hypertrophy-is-susceptible-in-male-but-protected-in-female-romk-bartter-s-mouse
#14
Jun-Mo Kim, Shuhua Xu, Xiaoyun Guo, Haiyan Hu, Ke Dong, Tong Wang
The renal outer medullary potassium channel (ROMK; Kir1.1) plays an important role in Na(+) and K(+) homeostasis. ROMK knockout mice (KO) show a similar phenotype to Bartter's syndrome of salt wasting and dehydration due to reduced Na-2Cl-K-cotransporter activity but not in ROMK1 KO. ROMK KO mice also show hydronephrosis; however, the mechanism of this phenotype has not been understood. We have previously demonstrated a gender-sex difference in hydronephrosis and PGE2 production in ROMK KO mouse. In this study we compared the gender-sex difference in bladder hypertrophy and hydronephrosis in ROMK KO mice...
November 1, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29092858/chronic-maternal-hypercortisolemia-in-late-gestation-alters-fetal-cardiac-function-at-birth
#15
Andrew Antolic, Charles E Wood, Maureen Keller-Wood
Studies in our laboratory have shown that modest chronic increases in maternal cortisol concentrations over the last 0.20 of gestation impair maternal glucose metabolism and increase the incidence of perinatal stillbirth. Previous studies had found an increase in maternal cortisol concentrations from 115 to 130d gestation in sheep increased both proliferation in fetal cardiomyocytes and apoptosis in the fetal cardiac Purkinje Fibers. We hypothesized that the adverse effects of excess cortisol may result in defects in cardiac conduction during labor and delivery...
November 1, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29070506/the-2017-new-investigator-review-awards
#16
Willis K Samson
n/a.
October 25, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29070505/inter-individual-variability-in-muscle-sympathetic-responses-to-static-handgrip-in-young-men-evidence-for-sympathetic-responder-types
#17
Anthony V Incognito, Connor J Doherty, Jordan B Lee, Matthew J Burns, Philip J Millar
Negative and positive muscle sympathetic nerve activity (MSNA) responders have been observed during mental stress. We hypothesized that similar MSNA response patterns could be identified during the first minute of static handgrip and contribute to the inter-individual variability throughout exercise. Supine measurements of multi-unit MSNA (microneurography) and continuous blood pressure (Finometer) were recorded in 29 young healthy men during the first (HG1) and second (HG2) minute of static handgrip (30% maximal voluntary contraction) and subsequent post-exercise circulatory occlusion (PECO)...
October 25, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29070504/first-evidences-of-nocturnin-in-fish-two-isoforms-in-goldfish-differentially-regulated-by-feeding
#18
Ayelen Melisa Blanco, Miguel Gómez-Boronat, Diego Madera, Ana Isabel Valenciano, Angel Luis Alonso-Gómez, María J Delgado
Nocturnin (NOC) is a unique deadenylase with robust rhythmic expression involved in the regulation of metabolic processes in mammals. Currently, the possible presence of NOC in fish is unknown. This report aimed to identify NOC in a fish model, the goldfish (Carassius auratus), and to study the possible regulation of its expression by feeding. Two partial-length cDNAs of 293 and 223 bp, named nocturnin-a (noc-a) and nocturnin-b (noc-b), were identified and found to be highly conserved among vertebrates. Both mRNAs show a similar widespread distribution in central and peripheral tissues, with higher levels detected for noc-a compared to noc-b...
October 25, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29070503/aerobic-exercise-training-induced-changes-in-serum-c1q-tnf-related-protein-levels-are-associated-with-reduced-arterial-stiffness-in-middle-aged-and-older-adults
#19
Natsuki Hasegawa, Shumpei Fujie, Naoki Horii, Masataka Uchida, Toshiyuki Kurihara, Kiyoshi Sanada, Takafumi Hamaoka, Motoyuki Iemitsu
Adiponectin regulates endothelial nitric oxide synthase in endothelial cells, and body fat loss by aerobic exercise training promotes adiponectin secretion. Recently, C1q/tumor necrosis factor-related proteins (CTRPs) have been identified as novel adipokines and are paralogs of adiponectin, but the association between exercise training-induced reduction of arterial stiffness and circulating CTRPs levels remains unclear. This study aimed to clarify whether the reduction of arterial stiffness in middle-aged and older adults is associated with the change in serum levels of CTRPs induced by exercise training...
October 25, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29046318/central-serotonin-and-the-control-of-arterial-blood-pressure-and-heart-rate-in-infant-rats-influence-of-sleep-state-and-sex
#20
Jennifer L Magnusson, Kevin James Cummings
Sudden Infant Death Syndrome (SIDS) is associated with serotonin (5-HT) neuron abnormalities. There is evidence of autonomic dysfunction during sleep in infants eventually succumbing to SIDS, as well as cardiovascular collapse prior to death. Neonatal rodents deficient in central 5-HT display hypotension and bradycardia. We hypothesized that central 5-HT reduces cardiac vagal tone and increases sympathetic vascular tone and, given the firing pattern of 5-HT neurons, that these effects are greater in quiet sleep (QS) than in active sleep (AS)...
October 18, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
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