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American Journal of Physiology. Endocrinology and Metabolism

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https://www.readbyqxmd.com/read/28196859/dietary-nitrite-reverses-features-of-postmenopausal-metabolic-syndrome-induced-by-high-fat-diet-and-ovariectomy-in-mice
#1
Kazuo Ohtake, Nobuyuki Ehara, Hiroshige Chiba, Genya Nakano, Kunihiro Sonoda, Junta Ito, Hiroyuki Uchida, Jun Kobayashi
Menopausal women are at greater risk of developing metabolic syndrome with reduced endothelial nitric oxide synthase (eNOS) activity. Hormone replacement therapy increases eNOS activity and normalizes some characteristics of metabolic syndrome. We hypothesized that nitric oxide (NO) supplementation should have a therapeutic effect in this syndrome. We examined the effect of dietary nitrite on mice model with postmenopausal metabolic syndrome induced by ovariectomy (OVX) with high fat diet (HF). C57BL/6 female mice were divided into five groups, sham+normal fat diet (NF), sham+ HF, OVX+HF without or with sodium nitrite (50mg and 150mg/L) in drinking water...
February 14, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28196858/the-2016-walter-b-cannon-lecture-deconstructing-metabolic-inflammation-using-cellular-systems
#2
Kenny L Chan, Parastoo Boroumand, Marciane Milanski, Nicolas J Pillon, Philip J Bilan, Amira Klip
Over the past years we have embarked in a systematic analysis of the effect of obesity or fatty acids on circulating monocytes, microvascular endothelial cells, macrophages and skeletal muscle cells. Using cell culture strategies, we have deconstructed complex physiological systems, then reconstructed 'partial equations' to better understand cell-to-cell communication. Through these approaches we identified that in high saturated fat environments, cell-autonomous pro-inflammatory pathways are activated in monocytes and endothelial cells, promoting monocyte adhesion and transmigration...
February 14, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28174181/cardiovascular-benefits-associated-with-higher-dietary-k-versus-lower-dietary-na-evidence-from-population-and-mechanistic-studies
#3
Alicia A McDonough, Luciana C Veiras, Claire A Guevara, Donna L Ralph
The WHO ranks hypertension the leading global risk factor for disease, specifically, cardiovascular disease. Blood pressure is higher in westernized populations consuming sodium-rich processed foods compared to isolated societies consuming potassium-rich natural foods. Evidence suggests that lowering dietary Na(+) is particularly beneficial in hypertensives who consume a high Na(+) diet. Nonetheless, numerous population studies demonstrate a relationship between higher dietary K(+), estimated from urinary excretion or dietary recall, and lower blood pressure regardless of sodium intake...
February 7, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28174180/suprachiasmatic-vasopressin-to-paraventricular-oxytocin-neurocircuit-in-the-hypothalamus-relays-light-reception-to-inhibition-of-feeding-behavior
#4
Putra Santoso, Masanori Nakata, Yoichi Ueta, Toshihiko Yada
Light syncronizes body's circadian rhythms by modulating the master clock located in the suprachiasmatic nucleus (SCN) of the hypothalamus. In modern life, the extended and/or irregular light exposure impairs circadian rhythms and consequently promotes feeding and metabolic disorders. However, the neuronal pathway through which light is coupled to feeding behavior is less elucidated. The present study employed the light exposure during dark phase of the day in rats and observed its effect on neuronal activity and feeding behavior...
February 7, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28174179/s100b-impairs-glycolysis-via-enhanced-poly-adp-ribosyl-ation-of-glyceraldehyde-3-phosphate-dehydrogenase-in-rodent-muscle-cells
#5
Kaori Hosokawa, Yoji Hamada, Atsushi Fujiya, Masatoshi Murase, Ryuya Maekawa, Yasuhiro Niwa, Takako Izumoto, Yusuke Seino, Shin Tsunekawa, Hiroshi Arima
S100 calcium-binding protein B (S100B), a multifunctional macromolecule mainly expressed in nerve tissues and adipocytes, has been suggested to contribute to the pathogenesis of obesity. To clarify the role of S100B in insulin action and glucose metabolism in peripheral tissues, we investigated the effect of S100B on glycolysis in myoblast and myotube cells. Rat myoblast L6 cells were treated with recombinant mouse S100B to examine glucose consumption, lactate production, glycogen accumulation, glycolytic metabolites and enzyme activity, insulin signaling, and poly(ADP-ribosyl)ation of glyceraldehyde-3-phosphate dehydrogenase (GAPDH)...
February 7, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28143858/phenotyping-of-adipose-liver-and-skeletal-muscle-insulin-resistance-and-response-to-pioglitazone-in-spontaneously-obese-rhesus-monkeys
#6
Jin Shang, Stephen F Previs, Stacey Conarello, Keefe Chng, Yonghua Zhu, Sandra C Souza, Michael Staup, Ying Chen, Dan Xie, Emanuel Zycband, Karni Schlessinger, Victoria Plamadeala Johnson, Gladys Arreaza, Franklin Liu, Diane Levitan, Liangsu Wang, Margaret van Heek, Mark Erion, Yixin Wang, David E Kelley
Insulin resistance and diabetes can develop spontaneously with obesity and aging in rhesus monkeys, highly similar to the natural history of obesity, insulin resistance and progression to type 2 diabetes in humans. The current studies in obese rhesus were undertaken to assess hepatic and adipose contributions to systemic insulin resistance, currently a gap in our knowledge, and to benchmark the responses to pioglitazone (PIO). A 2-step hyperinsulinemic-euglycemic clamp, with tracer-based glucose flux estimates, was used to measure insulin resistance and in an intervention study was repeated following six weeks of PIO treatment (3 mg/kg)...
January 31, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28143857/chronic-hyperinsulinemia-contributes-to-insulin-resistance-under-dietary-restriction-in-association-with-altered-lipid-metabolism-in-zucker-diabetic-fatty-rats
#7
Ippei Morita, Keiichi Tanimoto, Nobuteru Akiyama, Noriyuki Naya, Kumiko Fujieda, Takanori Iwasaki, Hideo Yukioka
Hyperinsulinemia is widely thought to be a compensatory response to insulin resistance, whereas its potentially causal role in the progression of insulin resistance remains to be established. Here, we aimed to examine whether hyperinsulinemia could affect the progression of insulin resistance in Zucker fatty diabetic (ZDF) rats. Male ZDF rats, at 8 weeks of age, were fed a diet ad libitum (AL) or DR of either 15% or 30% from AL feeding over 6 weeks. Insulin sensitivity was determined by hyperinsulinemic-euglycemic clamp...
January 31, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28143856/timing-of-meals-when-is-as-critical-as-what-and-how-much
#8
Peng Jiang, Fred W Turek
Over the past decade, a large body of literature has demonstrated that disruptions of the endogenous circadian clock, either environmental or genetic, lead to metabolic dysfunctions associated with obesity, diabetes, and other metabolic disorders. The phrase, "It is not only what you eat and how much you eat, but also when you eat" sends a simple message about circadian timing and body weight regulation. Getting this message out to clinicians and patients, while at the same time the elucidation of neuroendocrine, molecular, and genetic mechanisms underlying this phrase makes it very likely that the circadian impact on lifestyle and clinical practice could be soon adopted for improving overall human health...
January 31, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28143855/-nutraceuticals-in-relation-to-human-skeletal-muscle-and-exercise
#9
Colleen Siobhan Deane, Daniel J Wilkinson, Bethan E Phillips, Kenneth Smith, Timothy Etheridge, Philip J Atherton
Skeletal muscles have a fundamental role in locomotion and whole body metabolism, with muscle mass and quality being linked to improved health and even lifespan. Optimising nutrition in combination with exercise is considered an established, effective ergogenic practice for athletic performance. Importantly, exercise and nutritional approaches also remain arguably the most effective countermeasure for muscle dysfunction associated with ageing and numerous clinical conditions e.g. cancer cachexia, COPD and organ failure, via engendering favourable adaptations such as increased muscle mass and oxidative capacity...
January 31, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28096081/mice-with-hyperbilirubinemia-due-to-gilbert-s-syndrome-polymorphism-are-resistant-to-hepatic-steatosis-by-decreased-serine-73-phosphorylation-of-ppar%C3%AE
#10
Terry D Hinds, Peter A Hosick, Michael W Hankins, Andrea Nestor-Kalinoski, David E Stec
Gilbert's syndrome is derived from a polymorphism (TA repeat) in the hepatic UGT1A1 gene which results in decreased conjugation and increased levels of unconjugated bilirubin. Recently, we have shown that bilirubin binds directly to the fat burning nuclear peroxisome proliferator-activated receptor α (PPARα). Additionally, we have shown that serine 73 phosphorylation (Ser(P)(73)) of PPARα decreases activity by reducing its protein levels and transcriptional activity. The aim of this study was to determine if humanized mice with the Gilbert's polymorphism (HuUGT*28) have increased PPARα activation and reduced hepatic fat accumulation...
January 17, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28073780/chronic-kidney-disease-and-obesity-bias-surrogate-estimates-of-insulin-sensitivity-compared-to-the-hyperinsulinemic-euglycemic-clamp
#11
Iram Ahmad, Leila R Zelnick, Nicole R Robinson, Adriana M Hung, Bryan Kestenbaum, Kristina M Utzschneider, Steven E Kahn, Ian H de Boer
INTRODUCTION: Insulin sensitivity can be measured by procedures such as the hyperinsulinemic-euglycemic clamp or using surrogate indices. Chronic kidney disease (CKD) and obesity may differentially affect these measurements because of changes in insulin kinetics and organ-specific effects on insulin sensitivity. METHODS: In a cross-sectional study of 59 subjects with non-diabetic CKD (estimated glomerular filtration rate (GFR) <60 mL/min/1.73 m(2)) and 39 matched healthy controls, we quantified insulin sensitivity by clamp (SIclamp), oral glucose tolerance test, and fasting glucose and insulin...
January 10, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28073779/glucose-dependent-insulinotropic-polypeptide-promotes-lipid-deposition-in-subcutaneous-adipocytes-in-obese-type-2-diabetes-patients-a-maladaptive-response
#12
Sravan K Thondam, Christina Daousi, John P H Wilding, Jens J Holst, Gulizar I Ameen, Chenjing Yang, Catherine Whitmore, Silvia Mora, Daniel J Cuthbertson
: Glucose-dependent insulinotropic polypeptide (GIP) beyond its insulinotropic effects may regulate post-prandial lipid metabolism. While the insulinotropic action of GIP is known to be impaired in type 2 diabetes mellitus (T2DM), its adipogenic effect is unknown. We hypothesised GIP is anabolic in human subcutaneous adipose tissue (SAT) promoting triacylglycerol (TAG) deposition through re-esterification of non-esterified fatty acids (NEFA) and this effect may differ according to obesity status or glucose tolerance...
January 10, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28073778/overexpression-of-pgc-1%C3%AE-increases-peroxisomal-and-mitochondrial-fatty-acid-oxidation-in-human-primary-myotubes
#13
Tai-Yu Huang, Donghai Zheng, Joseph A Houmard, Jeffrey J Brault, Robert C Hickner, Ronald N Cortright
Peroxisomes are indispensable organelles for lipid metabolism in humans and their biogenesis has been assumed to be under regulation by peroxisome proliferator-activated receptors (PPARs). However, recent studies in hepatocytes suggest that the mitochondrial proliferator PGC-1α (peroxisome proliferator-activated receptor gamma coactivator-1 alpha) also acts as an upstream transcriptional regulator for enhancing peroxisomal abundance and associated activity. It is unknown whether the regulatory mechanism(s) for enhancing peroxisomal function is through the same node as mitochondrial biogenesis in human skeletal muscle (HSkM) and whether fatty acid oxidation (FAO) is affected...
January 10, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28049625/regulation-of-the-macrophage-oxytocin-receptor-in-response-to-inflammation
#14
Angela Szeto, Ni Sun-Suslow, Armando J Mendez, Rosa I Hernandez, Klaus V Wagner, Philip M McCabe
It has been demonstrated that the neuropeptide oxytocin (OT) attenuates oxidative stress and inflammation in macrophages. In the current study, we examined the role of inflammation on the expression of the oxytocin receptor (OXTR). We hypothesized that OXTR expression is increased during the inflammation though a nuclear factor kappa B (NF-κB) mediated pathway, thus responding as an acute phase protein. Inflammation was induced by treating macrophages (human primary, THP-1, and murine) with lipopolysaccharide (LPS) and monitored by expression of IL-6...
January 3, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28028037/muscle-interleukin-6-and-fasting-induced-pdh-regulation-in-mouse-skeletal-muscle
#15
Anders Gudiksen, Lærke Bertholdt, Mikkel Birkkjær Vingborg, Henriette Watson Hansen, Stine Ringholm Ringholm, Henriette Pilegaard
Fasting prompts a metabolic shift in substrate utilization from carbohydrate to predominant fat oxidation in skeletal muscle and pyruvate dehydrogenase (PDH) is seen as a controlling link between the competitive oxidation of carbohydrate and fat during metabolic challenges like fasting. Interleukin (IL)-6 has been proposed to be released from muscle with concomitant effects on both glucose and fat utilization. The aim was to test the hypothesis that IL-6 has a regulatory impact on fasting-induced suppression of skeletal muscle PDH...
December 27, 2016: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28028035/cardiometabolic-risk-improvement-in-response-to-a-3-yr-lifestyle-modification-program-in-men-contribution-of-improved-cardiorespiratory-fitness-vs-weight-loss
#16
Anne-Laure Borel, Julie-Anne Nazare, Aurélie Baillot, Natalie Alméras, Angelo Tremblay, Jean Bergeron, Dr Paul Poirier, Jean-Pierre Despres
OBJECTIVE: To examine the respective contributions of changes in visceral adiposity, subcutaneous adiposity, liver fat, and cardiorespiratory fitness (CRF) to the improvements in cardiometabolic risk markers observed in response to a 3-year healthy eating/physical activity lifestyle intervention. RESEARCH DESIGN AND METHODS: Ninety-four out of 144 viscerally obese but otherwise healthy men completed a 3-year lifestyle intervention. Body weight, body composition and fat distribution were assessed by anthropometry and DEXA/computed tomography...
December 27, 2016: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/27998960/acute-and-chronic-hyperglycemic-effects-of-vasopressin-in-normal-rats-involvement-of-v1a-receptors
#17
Christopher Taveau, Catherine Chollet, Daniel G Bichet, Gilberto Velho, Gilles Guillon, Maithe Corbani, Ronan Roussel, Lise Bankir, Olle Melander, Nadine Bouby
Recent epidemiological studies have revealed novel relationships between low water intake or high vasopressin (AVP) and the risk of hyperglycemia and diabetes. AVP V1A and V1B receptors (R) are expressed in liver and pancreatic islets, respectively. The present study was designed to determine the impact of different levels of circulating AVP on glucose homeostasis in normal Sprague Dawley rats, and the respective roles of V1AR and V1BR. We showed that acute injection of AVP induces a dose-dependent increase in glycemia...
December 20, 2016: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/27998959/exogenous-h2s-regulates-endoplasmic-reticulum-mitochondria-cross-talk-to-inhibit-apoptotic-pathways-in-stz-induced-type-i-diabetes
#18
Fan Yang, Xiangjing Yu, Ting Li, Jianjun Wu, YaJun Zhao, Jiaqi Liu, Aili Sun, Shiyun Dong, Jichao Wu, Xin Zhong, Changqing Xu, Fanghao Lu, Weihua Zhang
BACKGROUND: The upregulation of reactive oxygen species (ROS) is a primary cause of cardiomyocyte apoptosis in Diabetes cardiomyopathy (DCM). Mitofusin-2 (Mfn-2) is a key protein that bridges the mitochondria and endoplasmic reticulum(ER). Hydrogen sulfide (H2S)-mediated cardioprotection is related to antioxidant effects. The present study demonstrated that H2S inhibited the interaction between the ER and mitochondrial apoptotic pathway. METHODS: This study investigated cardiac function, ultrastructural changes in the ER and mitochondria, apoptotic rate using TUNEL and the expression of ER stress-associated proteins and mitochondrial apoptotic proteins in cardiac tissues in STZ-induced type I diabetic rats treated with or without NaHS (donor of H2S)...
December 20, 2016: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/27965206/prior-lactation-reduces-future-diabetic-risk-through-sustained-post-weaning-effects-on-insulin-sensitivity
#19
Harpreet Bajaj, Chang Ye, Anthony J Hanley, Phil W Connelly, Mathew Sermer, Bernard Zinman, Ravi Retnakaran
Breastfeeding ≥12 months is recommended for optimal infant nutrition but may hold maternal benefits, as well. Indeed, lactation has been associated with lower long-term risk of diabetes in the mother but the mechanism by which it imparts sustained post-weaning effects on glucose tolerance remains unclear. In this context, we postulated that lactation potentially could induce post-weaning beneficial effects on glucose tolerance by modifying the natural history of insulin sensitivity and/or pancreatic beta-cell function over time...
December 13, 2016: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/27965205/postnatal-treatment-with-metyrapone-attenuates-the-effects-of-diet-induced-obesity-in-female-rats-exposed-to-early-life-stress
#20
Margaret O Murphy, Joseph B Herald, Caleb T Wills, Stanley G Unfried, Dianne M Cohn, Analia S Loria
This study tested the hypothesis that female rats pups exposed to maternal separation (MatSep), a model of early life stress, display an exacerbated response to diet-induced obesity compared to male rats. Also, we tested whether postnatal treatment with metyrapone (MTP), a corticosterone synthase inhibitor, would attenuate this phenotype. MatSep was performed in WKY offspring by separation from the dam (3 hr/day, postnatal day 2-14). Upon weaning, male and female rats were placed on regular chow (ND, 18% kcal fat) or HFD (60% kcal fat)...
December 13, 2016: American Journal of Physiology. Endocrinology and Metabolism
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