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insulin metabolism

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https://www.readbyqxmd.com/read/29244961/time-dependent-therapeutic-roles-of-nitazoxanide-on-high-fat-diet-streptozotocin-induced-diabetes-in-rats-effects-on-hepatic-ppar-%C3%AE-receptors
#1
Samah Mohamed Elaidy, Mona A Hussain, Mohamed K El-Kherbetawy
Targeting Peroxisome Proliferator-Activated Receptor-gamma (PPAR-γ) is an approved strategy in facing insulin resistance (IR) for the diabetes mellitus (DM)-type 2. The PPAR-γ modulators display improvements in the insulin sensitizing and adverse effects of the traditional thiazolidinediones (TZDs). Nitazoxanide (NTZ) is proposed as a PPAR-γ receptor ligand, with agonistic post-transcriptional effects. Currently, NTZ-antidiabetic activities versus pioglitazone (PIO) in a high-fat diet/streptozotocin (HFD/STZ) rat model of type-2 diabetes was explored...
December 15, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/29244825/associations-of-sodium-intake-with-obesity-metabolic-disorder-and-albuminuria-according-to-age
#2
Se Won Oh, Ho Seok Koo, Kum Hyun Han, Sang Youb Han, Ho Jun Chin
Sodium intake is associated with obesity and metabolic disorder in the general population. However, sodium intake is significantly reduced according to the decrease of energy intake in older adults although the prevalence of obesity is higher than younger adults. We evaluate the association of sodium excretion (UNa) with blood pressure, obesity, metabolic disorders, and albuminuria according to age. An observational study using data from the Korean National Health and Nutrition Examination Survey IV-V (2008-2011) was performed (N = 18,146)...
2017: PloS One
https://www.readbyqxmd.com/read/29244064/%C3%AE-cell-control-of-insulin-production-during-starvation-refeeding-in-male-rats
#3
Brandon B Boland, Charles Brown, Cristina Alarcon, Damien Demozay, Joseph S Grimsby, Christopher J Rhodes
Mammalian metabolism has evolved to adapt relative to changes in nutrient status. Insulin, the key anabolic hormone, facilitates intracellular storage of nutrient fuels and plays a pivotal role in the transition away from catabolism upon refeeding. While circulating insulin relative to nutrient levels has been well-characterized during both fasting and refeeding, how pancreatic β-cell biology caters to acute changes in insulin demand has not been sufficiently addressed. Here, we examined the dynamics of (pro)insulin production and associated changes in β-cell ultrastructure during refeeding after a prolonged 72 hour fast in male rats...
December 13, 2017: Endocrinology
https://www.readbyqxmd.com/read/29243589/defective-stim-mediated-store-operated-ca2-entry-in-hepatocytes-leads-to-metabolic-dysfunction-in-obesity
#4
Ana Paula Arruda, Benedicte Mengel Pers, Günes Parlakgul, Ekin Güney, Ted Goh, Erika Cagampan, Grace Yankun Lee, Renata L Goncalves, Gökhan S Hotamisligil
Defective Ca2+ handling is a key mechanism underlying hepatic endoplasmic reticulum (ER) dysfunction in obesity. ER Ca2+ level is in part monitored by the store-operated Ca2+ entry (SOCE) system, an adaptive mechanism that senses ER luminal Ca2+ concentrations through the STIM proteins and facilitates import of the ion from the extracellular space. Here, we show that hepatocytes from obese mice displayed significantly diminished SOCE as a result of impaired STIM1 translocation, which was associated with aberrant STIM1 O-GlycNAcylation...
December 15, 2017: ELife
https://www.readbyqxmd.com/read/29243183/effects-of-experimental-periodontitis-on-the-metabolic-system-in-rats-with-diet-induced-obesity-dio-an-analysis-of-serum-biochemical-parameters
#5
Ryutaro Kuraji, Miyako Fujita, Hiroshi Ito, Shuichi Hashimoto, Yukihiro Numabe
Recent studies have shown that periodontitis accelerates the progression of obesity-associated metabolic diseases. Thus, we examined the influence of periodontitis on serum biochemical parameters of metabolic disease in a diet-induced obesity (DIO) rat. First, we established the DIO model using ten male rats fed with either basal diet (lean group) or high-fat diet (DIO group) for 12 weeks. Second, to examine the interaction between periodontitis and obesity, we divided 24 DIO rats into the following four groups...
December 14, 2017: Odontology
https://www.readbyqxmd.com/read/29243067/translational-regulation-in-the-anoxic-turtle-trachemys-scripta-elegans
#6
Kama E Szereszewski, Kenneth B Storey
The red-eared slider turtle (Trachemys scripta elegans), has developed remarkable adaptive mechanisms for coping with decreased oxygen availability during winter when lakes and ponds become covered with ice. Strategies for enduring anoxia tolerance include an increase in fermentable fuel reserves to support anaerobic glycolysis, the buffering of end products to minimize acidosis, altered expression in crucial survival genes, and strong metabolic rate suppression to minimize ATP-expensive metabolic processes such as protein synthesis...
December 14, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/29242624/plant-derived-compounds-strigolactone-gr24-and-pinosylvin-activate-sirt1-and-enhance-glucose-uptake-in-rat-skeletal-muscle-cells
#7
Shalem Modi, Nagendra Yaluri, Tarja Kokkola, Markku Laakso
Insulin resistance is a characteristic finding in hyperglycaemia and type 2 diabetes. SIRT1 is a NAD+ dependent deacetylase that plays a central role in glucose homeostasis and energy metabolism. SIRT1 activators, including plant polyphenols such as resveratrol, improve insulin sensitivity in skeletal muscle tissue. We hypothesised that the novel plant-derived compounds, strigolactone and pinosylvin, beneficially enhance SIRT1 function, insulin signalling, glucose uptake, and mitochondrial biogenesis in skeletal muscle cells...
December 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29242622/assessment-of-disturbed-glucose-metabolism-and-surrogate-measures-of-insulin-sensitivity-in-obese-children-and-adolescents
#8
Christian L Roth, Clinton Elfers, Christiane S Hampe
BACKGROUND: With the rising prevalence of obesity and type 2 diabetes (T2D) in obese children, it is becoming imperative to detect disturbed glucose metabolism as early as possible in order to prevent T2D development. SUBJECTS/METHODS: Cross-sectional study of 92 obese children (median age 11.7 years, 51% female) and 7 lean children (median age 11.4 years, 57% female) who underwent an oral glucose tolerance test (OGTT) in a tertiary pediatric care center. Glucose tolerance was assessed and different indices for β-cell function, insulin sensitivity and insulin secretion were calculated...
December 14, 2017: Nutrition & Diabetes
https://www.readbyqxmd.com/read/29242563/ck2-modulates-adipocyte-insulin-signaling-and-is-up-regulated-in-human-obesity
#9
Christian Borgo, Gabriella Milan, Francesca Favaretto, Fabio Stasi, Roberto Fabris, Valentina Salizzato, Luca Cesaro, Anna Belligoli, Marta Sanna, Mirto Foletto, Luca Prevedello, Vincenzo Vindigni, Romeo Bardini, Arianna Donella-Deana, Roberto Vettor
Insulin plays a major role in glucose metabolism and insulin-signaling defects are present in obesity and diabetes. CK2 is a pleiotropic protein kinase implicated in fundamental cellular pathways and abnormally elevated in tumors. Here we report that in human and murine adipocytes CK2-inhibition decreases the insulin-induced glucose-uptake by counteracting Akt-signaling and GLUT4-translocation to the plasma membrane. In mice CK2 acts on insulin-signaling in adipose tissue, liver and skeletal muscle and its acute inhibition impairs glucose tolerance...
December 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29242557/the-metabolic-syndrome-associated-small-g-protein-arl15-plays-a-role-in-adipocyte-differentiation-and-adiponectin-secretion
#10
Nuno Rocha, Felicity Payne, Isabel Huang-Doran, Alison Sleigh, Katherine Fawcett, Claire Adams, Anna Stears, Vladimir Saudek, Stephen O'Rahilly, Inês Barroso, Robert K Semple
Common genetic variants at the ARL15 locus are associated with plasma adiponectin, insulin and HDL cholesterol concentrations, obesity, and coronary atherosclerosis. The ARL15 gene encodes a small GTP-binding protein whose function is currently unknown. In this study adipocyte-autonomous roles for ARL15 were investigated using conditional knockdown of Arl15 in murine 3T3-L1 (pre)adipocytes. Arl15 knockdown in differentiated adipocytes impaired adiponectin secretion but not adipsin secretion or insulin action, while in preadipocytes it impaired adipogenesis...
December 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29242277/endoplasmic-reticulum-chaperone-grp78-regulates-macrophage-function-and-insulin-resistance-in-diet-induced-obesity
#11
Jong Hun Kim, Eunjung Lee, Randall H Friedline, Sujin Suk, Dae Young Jung, Sezin Dagdeviren, Xiaodi Hu, Kunikazu Inashima, Hye Lim Noh, Jung Yeon Kwon, Aya Nambu, Jun R Huh, Myoung Sook Han, Roger J Davis, Amy S Lee, Ki Won Lee, Jason K Kim
Obesity-mediated inflammation is a major cause of insulin resistance, and macrophages play an important role in this process. The 78-kDa glucose-regulated protein (GRP78) is a major endoplasmic reticulum chaperone that modulates unfolded protein response (UPR), and mice with GRP78 heterozygosity were resistant to diet-induced obesity. Here, we show that mice with macrophage-selective ablation of GRP78 (Lyz-GRP78-/-) are protected from skeletal muscle insulin resistance without changes in obesity compared with wild-type mice after 9 wk of high-fat diet...
December 14, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29242276/oral-sodium-butyrate-impacts-brain-metabolism-and-hippocampal-neurogenesis-with-limited-effects-on-gut-anatomy-and-function-in-pigs
#12
David Val-Laillet, Sylvie Guérin, Nicolas Coquery, Isabelle Nogret, Michèle Formal, Véronique Romé, Laurence Le Normand, Paul Meurice, Gwénaëlle Randuineau, Paul Guilloteau, Charles-Henri Malbert, Patricia Parnet, Jean-Paul Lallès, Jean-Pierre Segain
Butyrate can improve gut functions, whereas histone deacetylase inhibitors might alleviate neurocognitive alterations. Our aim was to assess whether oral butyrate could modulate brain metabolism and plasticity and if this would relate to gut function. Sixteen pigs were subjected to sodium butyrate (SB) supplementation via beverage water or water only [control (C)]. All pigs had blood sampled after 2 and 3 wk of treatment, and were subjected to a brain positron emission tomography after 3 wk. Animals were euthanized after 4 wk to sample pancreas, intestine, and brain for gut physiology and anatomy measurements, as well as hippocampal histology, Ki67, and doublecortin (DCX) immunohistochemistry...
December 14, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29242275/igfbp7-regulates-the-osteogenic-differentiation-of-bone-marrow-derived-mesenchymal-stem-cells-via-wnt-%C3%AE-catenin-signaling-pathway
#13
Wei Zhang, Erman Chen, Mo Chen, Chenyi Ye, Yiying Qi, Qianhai Ding, Hang Li, Deting Xue, Xiang Gao, Zhijun Pan
Insulin-like growth factor-binding protein 7 (IGFBP7), a low-affinity IGF binder, may play an important role in bone metabolism. However, its function in osteogenic differentiation of human bone marrow-derived mesenchymal stem cells (BMSCs) remains unclear. Therefore, we investigated its effects on osteogenic differentiation. Overexpression of IGFBP7 enhanced the expression of osteo-specific genes and proteins, and IGFBP7 knockdown decreased osteogenesis-specific markers. More mineral deposits and higher alkaline phosphatase activity were observed after the up-regulation of IGFBP7 Moreover, β-catenin levels were up-regulated by the overexpression of IGFBP7 or the addition of extracellular IGFBP7 protein and were reduced by the depletion of IGFBP7 The increase in osteogenic differentiation due to the overexpression of IGFBP7 was partially decreased by specific Wnt/β-catenin signaling inhibitors...
December 14, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29241990/influence-of-metformin-and-insulin-on-myocardial-substrate-oxidation-under-conditions-encountered-during-cardiac-surgery
#14
Cyonna Holmes, LaShondra Powell, Nicholas S Clarke, Michael E Jessen, Matthias Peltz
BACKGROUND: The influence of diabetic therapies on myocardial substrate selection during cardiac surgery is unknown but may be important to ensure optimal surgical outcomes. We hypothesized that metformin and insulin alter myocardial substrate selection during cardiac surgery and may affect reperfusion cardiac function. METHODS: Rat hearts (n = 8 per group) were evaluated under 3 metabolic conditions: normokalemia, cardioplegia, or bypass. Groups were perfused with Krebs-Henseleit buffer in the presence of no additives, metformin, insulin, or both insulin and metformin...
December 11, 2017: Surgery
https://www.readbyqxmd.com/read/29241756/gynecologic-and-andrologic-dermatology-and-the-metabolic-syndrome
#15
Maria Magdalena Roth, Nicholas Leader, George Kroumpouzos
The relationship of sex hormones to obesity and inflammation has been extensively studied. Research on endogenous and exogenous sex steroids, including studies on animal models of metabolic syndrome (MetS), has indicated that sex hormones are involved in metabolic pathways relevant to MetS. Lower testosterone levels in men and higher levels in women increase risks of MetS and type 2 diabetes mellitus (T2DM). Lower levels of sex hormone-binding globulin increase risks of MetS and T2DM in both sexes. Skin diseases that are sex hormone mediated, such as polycystic ovary syndrome, acanthosis nigricans, acne vulgaris, and pattern alopecia, have been associated with insulin resistance...
January 2018: Clinics in Dermatology
https://www.readbyqxmd.com/read/29241755/autoimmune-skin-diseases-and-the-metabolic-syndrome
#16
Begüm Ünlü, Ümit Türsen
The metabolic syndrome represents an important association of cutaneous maladies with cardiovascular illnesses. Chronic inflammation, shared risk factors (ie, smoking and alcohol consumption), treatment (ie, immunosuppressive agents and drugs that alter the lipid profile), and shared genetic risk loci have been proposed to the cause metabolic syndrome and cardiovascular morbidity of autoimmune diseases. There are many possible inflammatory mediators that are suggested to play a role in insulin resistance pathogenesis, such as tumor necrosis factor-α, interleukin-6, leptin, and adiponectin...
January 2018: Clinics in Dermatology
https://www.readbyqxmd.com/read/29241750/historical-perspectives-of-the-metabolic-syndrome
#17
Eiji Oda
The metabolic syndrome (MetS) or insulin resistance syndrome is a constellation of obesity-related metabolic derangements predisposing to type 2 diabetes and cardiovascular disease. In 1998, WHO defined the first criteria of MetS. Three years later, the user-friendly National Cholesterol Education Program criteria of MetS were proposed. Different criteria were issued by the International Diabetes Federation in 2005, making abdominal obesity a necessary component. Several international societies, including The International Diabetes Federation, jointly adopted the revised National Cholesterol Education Program criteria as harmonizing criteria of MetS in 2009...
January 2018: Clinics in Dermatology
https://www.readbyqxmd.com/read/29241749/acne-vulgaris-the-metabolic-syndrome-of-the-pilosebaceous-follicle
#18
Bodo C Melnik
Acne vulgaris is an epidemic inflammatory disease of the human sebaceous follicle and represents the most common skin disease affecting about 85% of adolescents in Westernized populations. Acne vulgaris is primarily a disease of wealthy countries and exhibits higher prevalence rates in developed compared with developing countries. No acne has been found in non-Westernized populations still living under Paleolithic dietary conditions constraining hyperglycemic carbohydrates, milk, and dairy products. The high prevalence rates of adolescent acne cannot be explained by the predominance of genetic factors but by the influence of a Western diet that overstimulates the key conductor of metabolism, the nutrient- and growth factor-sensitive kinase mTORC1...
January 2018: Clinics in Dermatology
https://www.readbyqxmd.com/read/29241748/psoriasis-and-the-metabolic-syndrome
#19
Paolo Gisondi, Anna Chiara Fostini, Irene Fossà, Giampiero Girolomoni, Giovanni Targher
Chronic plaque psoriasis is an immune-mediated inflammatory skin disease that is strongly associated with the clinical features of the metabolic syndrome (MetS), including abdominal obesity, hypertension, atherogenic dyslipidemia, type 2 diabetes, insulin resistance, and nonalcoholic fatty liver disease. The strength of these associations has been repeatedly confirmed by several observational studies. In particular, the prevalence of MetS in patients with psoriasis ranges from 20% to 50%, with a risk of having MetS is at least double in psoriatic patients compared with nonpsoriatic control individuals...
January 2018: Clinics in Dermatology
https://www.readbyqxmd.com/read/29241747/pathophysiology-of-the-metabolic-syndrome
#20
Emma McCracken, Monica Monaghan, Shiva Sreenivasan
The metabolic syndrome-otherwise called syndrome X, insulin resistance syndrome, Reaven syndrome, and "the deadly quartet"-is the name given to the aggregate of clinical conditions comprising central and abdominal obesity, systemic hypertension, insulin resistance (or type 2 diabetes mellitus), and atherogenic dyslipidemia. It is a prothrombotic and proinflammatory state characterized by increased inflammatory cytokine activity. In addition to inflammatory dermatoses such as psoriasis, lichen planus, and hidradenitis suppurativa, metabolic syndrome is also commonly associated with accelerated atherosclerotic cardiovascular disease, hyperuricemia/gout, chronic kidney disease, and obstructive sleep apnea...
January 2018: Clinics in Dermatology
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