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https://www.readbyqxmd.com/read/28733331/n-glycosylation-is-required-for-fdnc5-stabilization-and-irisin-secretion
#1
Yong Wei Nie, Dong Jun Liu
Irisin, a myokine derived from extracellular domain of FNDC5, has been shown to mediate thermogenesis of white adipose tissue. Biochemical data has shown that N-glycosylation of FNDC5 was unlikely to affect ligand or receptor activation of irisin. The N-glycosylation of FNDC5 remains poorly understood. Here, we analyze N-glycosylation sites of FNDC5 and find that two potential N-glycosylation sites (Asn36 and Asn81) could indeed be occupied by N-glycan. We further show that the lack of N-glycosylation decreases the secretion of irisin, which is relevant to the instability of FNDC5 and the deficiency of cleavage of signal peptide...
July 21, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/28732566/association-of-circulating-irisin-levels-with-metabolic-and-metabolite-profiles-of-korean-adolescents
#2
Han Byul Jang, Hyo-Jin Kim, Jae Heon Kang, Sang Ick Park, Kyung Hee Park, Hye-Ja Lee
CONTEXT: Irisin, a novel exercise-induced myokine, has been suggested to regulate energy metabolism. OBJECTIVE: We studied the relationship between circulating irisin and metabolic and metabolite profiles of Korean adolescents, and investigated the effects of physical activity, obesity, and metabolic syndrome (MetS) on irisin levels. MATERIALS AND METHODS: Data were obtained from the Korean Children-Adolescents Study. Our cross-sectional study included 618 adolescents (370 normal-weight and 248 obese adolescents; 316 boys and 302 girls) aged 12-15years...
August 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/28732565/circulating-irisin-levels-are-lower-in-patients-with-either-stable-coronary-artery-disease-cad-or-myocardial-infarction-mi-versus-healthy-controls-whereas-follistatin-and-activin-a-levels-are-higher-and-can-discriminate-mi-from-cad-with-similar-to-ck-mb-accuracy
#3
Athanasios D Anastasilakis, Dimitrios Koulaxis, Nikoleta Kefala, Stergios A Polyzos, Jagriti Upadhyay, Eirini Pagkalidou, Fotios Economou, Chrysostomos D Anastasilakis, Christos S Mantzoros
BACKGROUND: Several myokines are produced by cardiac muscle. We investigated changes in myokine levels at the time of acute myocardial infarction (MI) and following reperfusion in relation to controls. METHODS: Patients with MI (MI Group, n=31) treated with percutaneous coronary intervention (PCI) were compared to patients with stable coronary artery disease (CAD) subjected to scheduled PCI (CAD Group, n=40) and controls with symptoms mimicking CAD without stenosis in angiography (Control Group, n=43)...
August 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/28732027/serum-irisin-and-myostatin-levels-after-2-weeks-of-high-altitude-climbing
#4
Ewa Śliwicka, Tomasz Cisoń, Zbigniew Kasprzak, Alicja Nowak, Łucja Pilaczyńska-Szcześniak
Exposure to high-altitude hypoxia causes physiological and metabolic adaptive changes by disturbing homeostasis. Hypoxia-related changes in skeletal muscle affect the closely interconnected energy and regeneration processes. The balance between protein synthesis and degradation in the skeletal muscle is regulated by several molecules such as myostatin, cytokines, vitamin D, and irisin. This study investigates changes in irisin and myostatin levels in male climbers after a 2-week high-altitude expedition, and their association with 25(OH)D and indices of inflammatory processes...
2017: PloS One
https://www.readbyqxmd.com/read/28731451/novel-blood-based-biomarkers-of-cognition-stress-and-physical-or-cognitive-training-in-older-adults-at-risk-of-dementia-preliminary-evidence-for-a-role-of-bdnf-irisin-and-the-kynurenine-pathway
#5
Olivia C Küster, Daria Laptinskaya, Patrick Fissler, Cathrin Schnack, Martina Zügel, Verena Nold, Franka Thurm, Sina Pleiner, Alexander Karabatsiakis, Björn von Einem, Patrick Weydt, Andre Liesener, Andreas Borta, Alexander Woll, Bastian Hengerer, Iris-Tatjana Kolassa, Christine A F von Arnim
 Psychosocial stress and physical, cognitive, and social activity predict the risk of cognitive decline and dementia. The aim of this study was to elucidate brain-derived neurotrophic factor (BDNF), irisin, and the kynurenine pathway (KP) as potential underlying biological correlates. We evaluated associations of irisin and the KP with BDNF in serum and with cognition, stress, and activities. Furthermore, changes in serum concentrations of BDNF, irisin, and KP metabolites were investigated after physical or cognitive training...
July 18, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28724742/the-myokine-irisin-is-released-in-response-to-saturated-fatty-acids-and-promotes-pancreatic-beta-cell-survival-and-insulin-secretion
#6
Annalisa Natalicchio, Nicola Marrano, Giuseppina Biondi, Rosaria Spagnuolo, Rossella Labarbuta, Immacolata Porreca, Angelo Cignarelli, Marco Bugliani, Piero Marchetti, Sebastio Perrini, Luigi Laviola, Francesco Giorgino
This study explored the role of irisin as a new pancreatic beta-cell secretagogue and survival factor and its potential role in the communication between skeletal muscle and pancreatic beta-cells under lipotoxic conditions. Recombinant irisin stimulated insulin biosynthesis and glucose-stimulated insulin secretion (GSIS) in a PKA-dependent manner, and prevented saturated fatty acid-induced apoptosis in human and rat pancreatic beta-cells, as well as in human and murine pancreatic islets, via AKT/BCL2 signaling...
July 19, 2017: Diabetes
https://www.readbyqxmd.com/read/28710063/5-years-later-irisin-detection-still-an-issue
#7
Alexandra B Cooke, Yessica-Haydee Gomez, Stella Styliani Daskalopoulou
Not applicable.
July 14, 2017: European Journal of Endocrinology
https://www.readbyqxmd.com/read/28709749/the-brown-fat-secreted-adipokine-neuregulin-4-is-decreased-in-gestational-diabetes-mellitus
#8
S Kralisch, A Hoffmann, J Kratzsch, M Blüher, M Stumvoll, M Fasshauer, T Ebert
AIMS: Neuregulin 4 has recently been recognized as a novel adipokine secreted by brown adipose tissue (BAT), with beneficial effects on murine insulin resistance and hepatic steatosis. Yet, thus far, neither regulation of neuregulin 4 in gestational diabetes mellitus (GDM) nor its longitudinal changes in the peripartum period have been elucidated. METHODS: Circulating neuregulin 4 levels were measured by ELISA in 74 women with GDM and 74 healthy, gestational-age-matched controls...
July 11, 2017: Diabetes & Metabolism
https://www.readbyqxmd.com/read/28694840/hepatic-adipocyte-enteric-and-pancreatic-hormones-response-to-dietary-macronutrient-composition-and-relationship-with-metabolism
#9
Bridget M Hron, Cara B Ebbeling, Henry A Feldman, David S Ludwig
BACKGROUND: We sought to characterize the effects of dietary macronutrient composition on various hormones implicated in the regulation of insulin sensitivity (IS) and energy expenditure (EE). METHODS: Following 10-15% weight loss, 21 overweight subjects consumed 3 weight-loss maintenance diets [low fat (LF), low glycemic index (LGI) and very low carbohydrate (VLC)] in random order, each for 4 weeks. At baseline and at the end of each treatment period, fasting samples for fibroblast growth factor (FGF)-21, heme-oxygenase-1 (HO-1), chemerin, irisin, secreted frizzle-related protein (SFRP-4), total bile acids, ghrelin, gastrin inhibitory peptide (GIP), peptide-Y, and amylin; hepatic and peripheral IS; and EE were obtained...
2017: Nutrition & Metabolism
https://www.readbyqxmd.com/read/28687176/the-impact-of-a-single-bout-of-high-intensity-circuit-training-on-myokines-concentrations-and-cognitive-functions-in-women-of-different-age
#10
A Gmiat, K Micielska, M Kozłowska, D J Flis, M Smaruj, S Kujach, J Jaworska, P Lipińska, E Ziemann
The study aimed to assess effect of a single bout of high-intensity circuit training (HICT) on myokines concentration: interleukin-6 and irisin, inteleukin-10, brain-derived neurotrophic factor (BDNF), heat shock proteins (HSP27, HSP70) and cognitive functions among women participated in HICT. It also attempted evaluating whether vitamin D could have modified the effect of HICT. Fourteen healthy, non-active women participating in the experiment were assigned to a young or middle-aged group. They performed a single session HICT using body weight as a resistance, based on the ACSM recommendations...
July 5, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28676551/increased-fndc5-is-associated-with-insulin-resistance-in-high-fat-fed-mice
#11
Brianne L Guilford, Jake C Parson, Caleb W Grote, Stephanie N Vick, Janelle M Ryals, Douglas E Wright
FNDC5/irisin, has recently been identified as a novel protein that stimulates the "browning" of white adipose by inducing thermogenesis via increased uncoupling protein 1 (UCP1). We tested the hypothesis that high fat diet-induced prediabetic mice would exhibit increased FNDC5 and this effect would be attenuated by chronic exercise. C57BL/6 mice were randomized into three groups for the 4 week intervention: Standard diet (Std, n = 12), High fat diet (HF, n = 14), or High fat diet and free access to a running wheel (HFEX, n = 14)...
July 2017: Physiological Reports
https://www.readbyqxmd.com/read/28666854/small-interfering-rna-mediated-knockdown-of-irisin-suppresses-food-intake-and-modulates-appetite-regulatory-peptides-in-zebrafish
#12
Lakshminarasimhan Sundarrajan, Suraj Unniappan
Irisin is a myokine encoded in fibronectin type III domain containing 5 (FNDC5). FNDC5 forms an integral part of the muscle post-exercise, and causes an increase in energy expenditure in mammals. Irisin is abundantly expressed in cardiac and skeletal muscles and is secreted upon activation of peroxisome proliferator-activated receptor gamma coactivator-1 (PGC-1 alpha). Irisin regulates feeding behaviour and cardiovascular function in mammals. More recently, irisin has gained importance as a potential biomarker for myocardial infarction due to its abundance in cardiac muscle...
June 27, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28658348/new-insights-into-the-effects-of-irisin-levels-in-hiv-infected-subjects-correlation-with-adiposity-fat-free-mass-and-strength-parameters
#13
Joice Cristina Dos Santos Trombeta, Jonato Prestes, Dahan da Cunha Nascimento, Ramires Alsamir Tibana, Guilherme Borges Pereira, Thiago da Rosa Lima, Géssica Alves Fraga, Roberto Carlos Vieira-Junior, Fabrício Azevedo Voltarelli
Objective: Patients infected with the human immunodeficiency virus (HIV) have an increased risk of metabolic disorders and alterations on irisin levels. Therefore, the purpose of the current investigation was to quantify the circulating irisin concentration in HIV-infected subjects under highly active antiretroviral therapy and to determine possible correlations between irisin levels with fat mass, fat-free mass, body mass index (BMI), and muscle strength. Subjects and methods: Cross-sectional study of 10 men (36...
June 26, 2017: Archives of Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28654680/serum-fatty-acid-binding-protein-4-fabp4-concentration-is-associated-with-insulin-resistance-in-peripheral-tissues-a-clinical-study
#14
Risa Nakamura, Tsuyoshi Okura, Yohei Fujioka, Keisuke Sumi, Kazuhiko Matsuzawa, Shoichiro Izawa, Etsuko Ueta, Masahiko Kato, Shin-Ichi Taniguchi, Kazuhiro Yamamoto
Type 2 diabetes mellitus (T2DM) is caused by insulin resistance and β cell dysfunction. In recent studies reported that several markers associated with insulin sensitivity in skeletal muscle, Adiponectin and other parameters, such as fatty acid-binding protein (FABP4), have been reported to regulate insulin resistance, but it remains unclear which factor mostly affects insulin resistance in T2DM. In this cross-sectional study, we evaluated the relationships between several kinds of biomarkers and insulin resistance, and insulin secretion in T2DM and healthy controls...
2017: PloS One
https://www.readbyqxmd.com/read/28627815/the-levels-of-serum-irisin-as-a-predictor-of-insulin-resistance-in-han-chinese-adults-with-metabolically-healthy-obesity
#15
Bo-Wei Liu, Fu-Zai Yin, Xi-Ming Qi, Dong-Mei Fan, Yue Zhang
BACKGROUND: The aim of this study was to evaluate serum irisin levels and analyze its related factors in Han adults with metabolically healthy obesity. METHODS: This cross-sectional study included 75 metabolically healthy, non-obese adults and 51 metabolically healthy, obese adults. Anthropometric measurements, including height, weight, waist circumference (WC), and blood pressure, were performed. All patients underwent an oral glucose tolerance test (OGTT) after 8 hours of fasting, and the levels of glucose, insulin, lipids, and serum irisin were measured...
May 1, 2017: Clinical Laboratory
https://www.readbyqxmd.com/read/28627208/irisin-is-weakly-associated-with-usual-physical-activity-in-young-overweight-women
#16
Beatriz Tenorio, Teresa Jiménez, Gladys Barrera, Sandra Hirsch, Maria Pia De la Maza, Rodrigo Troncoso, María Belén Farias, Juan Manuel Rodríguez, Daniel Bunout
PURPOSE: To determine if irisin plasma levels are associated with regular physical activity, body composition and metabolic parameters in women subjected to calorie restriction. SUBJECTS AND METHODS: We studied 42 women aged 34 ± 13 years with a body mass index of 27.7 ± 1.8 kg/m2, who were subjected to a calorie restriction for three months. At baseline and at the end of the study, weight, waist and hip circumference, laboratory parameters, body composition by DEXA, resting and activity energy expenditure by indirect calorimetry and 72 hours actigraphy were measured...
June 5, 2017: Nutrición Hospitalaria: Organo Oficial de la Sociedad Española de Nutrición Parenteral y Enteral
https://www.readbyqxmd.com/read/28620456/effects-of-physical-activity-on-the-link-between-pgc-1a-and-fndc5-in-muscle-circulating-%C3%AE-risin-and-ucp1-of-white-adipocytes-in-humans-a-systematic-review
#17
Petros C Dinas, Ian M Lahart, James A Timmons, Per-Arne Svensson, Yiannis Koutedakis, Andreas D Flouris, George S Metsios
Background: Exercise may activate a brown adipose-like phenotype in white adipose tissue. The aim of this systematic review was to identify the effects of physical activity on the link between peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1a) and fibronectin type III domain-containing protein 5 (FNDC5) in muscle, circulating Irisin and uncoupling protein one (UCP1) of white adipocytes in humans. Methods: Two databases (PubMed 1966 to 08/2016 and EMBASE 1974 to 08/2016) were searched using an appropriate algorithm...
2017: F1000Research
https://www.readbyqxmd.com/read/28614774/new-insight-into-the-direct-anti-inflammatory-activity-of-a-myokine-irisin-against-proinflammatory-activation-of-adipocytes-implication-for-exercise-in-obesity
#18
A I Mazur-Bialy, J Bilski, E Pochec, T Brzozowski
A biological activity of myokine irisin, has been intensively investigated in the context of a browning process occurring in white adipose tissue, but its role as a modulator of immune response has been little studied. The aim of our study was to determine the impact of irisin (0 - 100 nM) on pro-inflammatory activation of adipocyte 3T3 L1 cell line. Irisin reduced in a concentration-dependent manner the expression and activity of major proinflammatory cytokines, e.g. tumor necrosis factor-alpha (TNF-α) and interleukin 6 (IL-6) expression and their secretion into cell medium...
April 2017: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
https://www.readbyqxmd.com/read/28595178/irisin-regulates-heme-oxygenase-1-adiponectin-axis-in-perivascular-adipose-tissue-and-improves-endothelial-dysfunction-in-diet-induced-obese-mice
#19
Ningning Hou, Gang Du, Fang Han, Jin Zhang, Xiaotong Jiao, Xiaodong Sun
AIMS: To determine whether irisin could improve endothelial dysfunction by regulating heme oxygenase-1(HO-1)/adiponectin axis in perivascular adipose tissue (PVAT) in obesity. METHODS: Male C57BL/6 mice were fed with a high-fat diet (HFD) with or without irisin treatment. Endothelium-dependent vasorelaxation of the thoracic aorta with or without PVAT (PVAT+ or PVAT-) was determined. Western blot was employed to determine the levels of HO-1 and adiponectin in PVAT...
2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28595171/serum-irisin-predicts-mortality-risk-in-acute-heart-failure-patients
#20
Shutong Shen, Rongrong Gao, Yihua Bei, Jin Li, Haifeng Zhang, Yanli Zhou, Wenming Yao, Dongjie Xu, Fang Zhou, Mengchao Jin, Siqi Wei, Kai Wang, Xuejuan Xu, Yongqin Li, Junjie Xiao, Xinli Li
BACKGROUND/AIMS: Irisin is a peptide hormone cleaved from a plasma membrane protein fibronectin type III domain containing protein 5 (FNDC5). Emerging studies have indicated association between serum irisin and many major chronic diseases including cardiovascular diseases. However, the role of serum irisin as a predictor for mortality risk in acute heart failure (AHF) patients is not clear. METHODS: AHF patients were enrolled and serum was collected at the admission and all patients were followed up for 1 year...
2017: Cellular Physiology and Biochemistry
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