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Irisin

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https://www.readbyqxmd.com/read/28906529/the-effect-of-iloprost-and-sildenafil-alone-and-in-combination-on-myocardial-ischaemia-and-nitric-oxide-and-irisin-levels
#1
Suna Aydin, Tuncay Kuloglu, Suleyman Aydin, Meltem Yardim, Davut Azboy, Zeki Temizturk, Ali Kemal Kalkan, Mehmet Nesimi Eren
AIM: Insufficient oxygen supply to organs and tissues due to reduced arterial or venous blood flow results in ischaemia, during which, although ATP production stops, AMP and adenosine continue to be produced from ATP. The fate of irisin, which causes the production of heat instead of ATP during ischaemia, is unknown. Iloprost and sildenafil are two pharmaceutical agents that mediate the resumption of reperfusion (blood supply) via vasodilatation during ischaemic conditions. Our study aimed to explore the effects of iloprost and sildenafil on irisin levels in the heart, liver and kidney tissues and whether these pharmaceutical agents had any impact on serum irisin and nitric oxide levels in rats with induced experimental myocardial ischaemia...
August 31, 2017: Cardiovascular Journal of Africa
https://www.readbyqxmd.com/read/28904307/irisin-is-a-biomarker-for-metabolic-syndrome-in-prepubertal-children
#2
Young Suk Shim, Min Jae Kang, Seung Yang, Il Tae Hwang
The aim of the present study was to evaluate the association of irisin with obesity and metabolic syndrome (MetS) in Korean prepubertal children. A total of 96 children and adolescents aged 6 to 10 years (56 males) were included in this study. Subjects were divided into 3 groups: normal weight (n = 54), overweight (n = 16), and obese (n = 26). In the subgroup analyses, overweight/obese children were further divided based on their MetS status (with MetS vs. without MetS). Children with obesity tended to exhibit a lower mean irisin concentration compared to those with normal weight (p = 0...
September 12, 2017: Endocrine Journal
https://www.readbyqxmd.com/read/28888936/%C3%AE-arrestin-2-is-involved-in-irisin-induced-glucose-metabolism-in-type-2-diabetes-via-p38-mapk-signaling
#3
Yaling Pang, Haihui Zhu, Jianqin Xu, Lihua Yang, Lingjiao Liu, Jing Li
Type 2 diabetes mellitus (T2DM) is a common metabolic disease worldwide. It has been reported that irisin play regulatory role in glucose metabolism in T2DM. However, the underlying mechanism involved in that is not completely known. Herein, we determined the novel role of β-arrestin-2 in irisin-induced glucose utilization in diabetes. Effects of irisin and β-arrestin-2 on glucose utilization were investigated in a rat model of diabetes and in diabetic C2C12 cells in vitro. Results showed that irisin had positive role in glucose metabolism via regulating glucose tolerance as well as uptake in cardiac and skeletal muscle tissues, as evidenced by IPGTT, 2-deoxyglucose uptake and plasma membrane GLUT-4 assay...
September 6, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28886320/investigation-of-the-irisin-preptin%C3%A2-and-adropin-levels-in-the-blood-serum-of-alburnus-tarichi
#4
F Caf, S Algul, M Koyun
Irisin, preptin and adropin are three newly discovered peptides that play critical roles in regulating energy homeostasis in various vertebrates.The purposes of this study were to measure the serum concentrations of preptin, adropin and irisin in the Alburnus tarichi and to investigate the relationship of these peptides to the weight, gender and length of this the fish, which will provide useful information for future biotechnology purposes aimed at improvements in aquaculture production. This study used 12 adult A...
August 30, 2017: Cellular and Molecular Biology
https://www.readbyqxmd.com/read/28875825/study-of-irisin-hormone-level-in-type-2-diabetic-patients-and-patients-with-diabetic-nephropathy
#5
Salah Shelbaya, Manal Mohamed Abushady, Merhan Samy Nasr, Meram Mohamed Bekhet, Yasmine Abd-Al Mageed, Magdy Abbas
BACKGROUND: Type 2 diabetic patients with diabetic nephropathy are associated with multifactorial abnormal energy metabolism. Irisin has been recently introduced as a hormone that is exercise induced and is secreted by skeletal muscles. It is hypothesized that patients with chronic kidney disease usually have abnormal irisin levels. AIM: We aimed to study the level of Irisin hormone in patients with type 2 diabetes and to document if it is related to diabetic nephropathy...
August 29, 2017: Current Diabetes Reviews
https://www.readbyqxmd.com/read/28869754/the-irisin-hormone-profile-and-expression-in-human-bone-tissue-in-the-bone-healing-process-in-patients
#6
Sancar Serbest, Uğur Tiftikçi, Hacı Bayram Tosun, Üçler Kısa
BACKGROUND Whether or not there is a relationship between the newly-discovered irisin hormone and bone healing is not yet known. The aim of this study was to investigate what effect irisin hormone has on the bone healing process. MATERIAL AND METHODS The study included 21 adult patients with a diagnosed fracture of the lower extremity (femur or tibia). Informed consent was obtained from all the patients. A total of four venous blood samples were taken from the patients: before fracture stabilization, then postoperatively on days 1, 10, and 60...
September 4, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28867187/irisin-stimulates-cell-proliferation-and-invasion-by-targeting-the-pi3k-akt-pathway-in-human-hepatocellular-carcinoma
#7
Guangjun Shi, Nan Tang, Jiantao Qiu, Deguo Zhang, Fei Huang, Yayu Cheng, Kun Ding, Weisheng Li, Ping Zhang, Xueying Tan
Irisin is a newly identified myokine that may be cancer-associated, and its impact on liver cancer is unclear. To understand the roles of irisin in liver cancer, we investigated its effect in HepG2 and SMCC7721 hepatocellular carcinoma cells, and the underlying mechanisms. We determined irisin levels in liver tissues and serum samples obtained from patients by using real-time polymerase chain reaction and enzyme-linked immunosorbent assay. Irisin levels in cancerous livers were significantly upregulated compared with those in control livers, but serum irisin levels remained unchanged...
August 31, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28844533/irisin-stimulates-gonadotropins-gene-expression-in-tilapia-oreochromis-niloticus-pituitary-cells
#8
Quan Jiang, Qianli Zhang, Anji Lian, Yue Xu
The link between energy metabolism and reproduction is well known in vertebrates. Irisin, the product of fibronectin type III domain-containing protein 5 (FNDC5) gene, plays an important role in energy homeostasis. However, biological actions of irisin on reproduction remain elusive. To address this gap, we examined the direct effects of irisin on luteinizing hormone β (LHβ) and follicle-stimulating hormone β (FSHβ) gene expression in tilapia pituitary cells. As a first step, the transcripts of FNDC5 were detected in the proximal pars distalis (PPD), but not in the rostral pars distalis (RPD) and neurointermediate lobe (NIL) of the tilapia pituitary by RT-PCR...
October 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28835761/the-effect-of-n-3-polyunsaturated-fatty-acids-supplementation-on-serum-irisin-in-patients-with-type-2-diabetes-a-randomized-double-blind-placebo-controlled-trial
#9
Samaneh Ansari, Mahmoud Djalali, Niyaz Mohammadzadeh Honarvar, Maryam Mazaherioun, Mahnaz Zarei, Fahimeh Agh, Zahra Gholampour, Mohammad Hassan Javanbakht
BACKGROUND: Diabetes refers to a group of metabolic diseases with blood glucose of higher than normal ranges. Furthermore, n-3 polyunsaturated fatty acids are necessary for the regulation of the activity of human function. The effect of n-3 PUFA on diabetes has been investigated in animal studies, yet, the exact amount has not been set, to date. Irisin, as a new myokine, is released from skeletal muscle and Irisin levels decrease as a result of physical inactivity, overweightness, and obesity...
January 2017: International Journal of Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28828264/exercise-training-with-dietary-restriction-enhances-circulating-irisin-level-associated-with-increasing-endothelial-progenitor-cell-number-in-obese-adults-an-intervention-study
#10
Junhao Huang, Shen Wang, Fengpeng Xu, Dan Wang, Honggang Yin, Qinhao Lai, Jingwen Liao, Xiaohui Hou, Min Hu
OBJECTIVE: Circulating endothelial progenitor cells (EPCs) correlate negatively with obesity. Previous studies have shown that exercise significantly restores circulating EPC levels in obese people; however, the underlying mechanisms have not been elucidated. Recently, irisin has been reported to have a critical role in the regulation of EPCs. This exercise-induced myokine has been demonstrated to play a therapeutic role in obesity. In this study, we hypothesized that the increase in circulating irisin may form a link with increasing EPC levels in obese people after exercise...
2017: PeerJ
https://www.readbyqxmd.com/read/28801552/gene-location-expression-and-function-of-fndc5-in-meishan-pigs
#11
Chunbo Cai, Gaojun Xiao, Lili Qian, Shengwang Jiang, Biao Li, Shanshan Xie, Ting Gao, Xiaorong An, Wentao Cui, Kui Li
Irisin is a new muscular regulatory factor that is generated by the cleavage of its precursor protein fibronectin type III domain-containing protein 5 (FNDC5). Irisin promotes fat consumption due to its stimulatory role in the browning of the adipocytes in mice. Currently, there is no report on FNDC5 functions in pigs as model animals. In this study, we investigated the expression patterns and functions of FNDC5 in Meishan pigs. Our results showed that FNDC5 gene in Meishan pigs contains five transcripts, all of which can be translated into functional intact irisin proteins...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28800407/human-brown-adipose-tissue-function-and-therapeutic-potential-in-metabolic-disease
#12
REVIEW
Padmanabh Shrikant Bhatt, Waljit S Dhillo, Victoria Salem
There has been a resurgence of interest in brown adipose tissue (BAT) over the last decade. Key to this has been our ability to accurately image it, which has improved significantly. The role of BAT in regulating energy expenditure is important, and its pharmacological manipulation may hold therapeutic potential in metabolic disease. There is ample evidence of BAT activation by cold exposure, and pharmacological utilisation of similar pathways, using B3 receptor agonists holds promise since the development of selective agonists with limited cross-reactivity has rekindled interest...
August 8, 2017: Current Opinion in Pharmacology
https://www.readbyqxmd.com/read/28771499/irisin-regulates-cardiac-physiology-in-zebrafish
#13
Lakshminarasimhan Sundarrajan, Chanel Yeung, Logan Hahn, Lynn P Weber, Suraj Unniappan
Irisin is a myokine encoded in its precursor fibronectin type III domain containing 5 (FNDC5). It is abundantly expressed in cardiac and skeletal muscle, and is secreted upon the activation of peroxisome proliferator-activated receptor gamma coactivator-1 (PGC-1 alpha). We aimed to study the role of irisin on cardiac function and muscle protein regulation in zebrafish. Western blot analyses detected the presence of irisin protein (23 kDa) in zebrafish heart and skeletal muscle, and irisin immunoreactivity was detected in both tissues...
2017: PloS One
https://www.readbyqxmd.com/read/28763828/muscle-bone-interactions-movement-in-the-field-of-mechano-humoral-coupling-of-muscle-and-bone
#14
Christopher P Cardozo, Zachary A Graham
Cyclical, mechanical loading of bone by skeletal muscle is widely recognized as a critical determinant of bone structure and mass. A growing body of evidence indicates that substances released from skeletal muscle into the bloodstream also regulate bone mass and metabolism. In this commentary, we discuss the status of research in the area of humoral regulation of bone mass by the skeletal muscle secretome, with an emphasis on the roles of myostatin, irisin, interleukin-6, and exosomes. The interplay between muscle, bone, and other modulators of bone mass, including circadian rhythm and sympathetic tone, is also discussed...
August 1, 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28762909/-changes-of-concentration-of-irisin-in-blood-of-patients-with-hypertensive-disease-after-physical-effort
#15
B I Kuznik, S O Davydov, A V Stepanov, N V Morar
No abstract text is available yet for this article.
April 2017: Kardiologiia
https://www.readbyqxmd.com/read/28759938/irisin-and-testosterone-in-men-with-metabolic-syndrome
#16
Zdravko Kamenov, Yavor Assyov, Petya Angelova, Antoaneta Gateva, Adelina Tsakova
The beneficial effects of testosterone on the metabolism and body composition of men are well established but the exact mechanisms of these effects are not clearly understood. A potential explanation might lie in the hormones, secreted from skeletal muscles, named "myokines". One such myokine, irisin, has been shown to also have potential beneficial metabolic effects. The aim of this pilot study was to evaluate the association of serum testosterone with circulating serum irisin levels in men with metabolic syndrome...
July 31, 2017: Hormone and Metabolic Research, Hormon- und Stoffwechselforschung, Hormones et Métabolisme
https://www.readbyqxmd.com/read/28744117/alteration-of-the-irisin-brain-derived-neurotrophic-factor-axis-contributes-to-disturbance-of-mood-in-copd-patients
#17
Csaba Papp, Krisztian Pak, Tamas Erdei, Bela Juhasz, Ildiko Seres, Anita Szentpéteri, Laszlo Kardos, Maria Szilasi, Rudolf Gesztelyi, Judit Zsuga
COPD is accompanied by limited physical activity, worse quality of life, and increased prevalence of depression. A possible link between COPD and depression may be irisin, a myokine, expression of which in the skeletal muscle and brain positively correlates with physical activity. Irisin enhances the synthesis of brain-derived neurotrophic factor (BDNF), a neurotrophin involved in reward-related processes. Thus, we hypothesized that mood disturbances accompanying COPD are reflected by the changes in the irisin-BDNF axis...
2017: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/28733331/n-glycosylation-is-required-for-fdnc5-stabilization-and-irisin-secretion
#18
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
#19
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
#20
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
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