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https://www.readbyqxmd.com/read/29745314/obesity-and-its-association-with-irisin-level-among-individuals-with-fndc5-irisin-gene-variants-rs16835198-and-rs726344
#1
Azza Abdu Allah, Eman Abd El Gayed, Sahar Hammoudah, Lama Mohamed El-Attar, Walid Shehab-Eldin
BACKGROUND: Irisin; a novel myokine/adipokine; encoded by FNDC5 gene have been suggested to play an important role in energy metabolism and obesity. However, the genetic variations at this locus and their effects on different metabolic parameters is still poorly understood. AIM: This study aimed to investigate the role of FNDC5/irisin gene polymorphisms (RS16835198 and RS726344) in obese individuals and their genotype phenotype correlation with circulating serum irisin level and other biochemical parameters like glucose, lipid metabolism and liver enzymes...
May 8, 2018: Protein and Peptide Letters
https://www.readbyqxmd.com/read/29608940/an-update-on-the-role-of-irisin-in-the-regulation-of-endocrine-and-metabolic-functions
#2
REVIEW
Mohamed Omer Mahgoub, Crystal D'Souza, Reem S M H Al Darmaki, May M Y H Baniyas, Ernest Adeghate
Irisin is a novel myokine and adipokine that has gained much attention recently due to its mechanisms of action. Irisin is secreted following proteolytic cleavage of its precursor fibronectin type III domain containing 5 (FNDC5). Following its release, irisin exerts its major action by increasing the expression of mitochondrial uncoupling protein 1 (UCP 1), which facilitates the conversion of white adipose tissue (WAT) into beige adipose tissue. Irisin is distributed in various body tissues and several actions have been attributed to its presence in those tissues...
March 30, 2018: Peptides
https://www.readbyqxmd.com/read/29587291/retinoic-acid-increases-fatty-acid-oxidation-and-irisin-expression-in-skeletal-muscle-cells-and-impacts-irisin-in-vivo
#3
Jaume Amengual, Francisco J García-Carrizo, Andrea Arreguín, Hana Mušinović, Nuria Granados, Andreu Palou, M Luisa Bonet, Joan Ribot
BACKGROUND/AIMS: All-trans retinoic acid (ATRA) has protective effects against obesity and metabolic syndrome. We here aimed to gain further insight into the interaction of ATRA with skeletal muscle metabolism and secretory activity as important players in metabolic health. METHODS: Cultured murine C2C12 myocytes were used to study direct effects of ATRA on cellular fatty acid oxidation (FAO) rate (using radioactively-labelled palmitate), glucose uptake (using radioactively-labelled 2-deoxy-D-glucose), triacylglycerol levels (by an enzymatic method), and the expression of genes related to FAO and glucose utilization (by RT-real time PCR)...
March 21, 2018: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29574076/detection-and-quantitation-of-irisin-in-human-cerebrospinal-fluid-by-tandem-mass-spectrometry
#4
Qingwei Ruan, Limin Zhang, Jian Ruan, Xixue Zhang, Jie Chen, Cheng Ma, Zhuowei Yu
The myokine irisin can cross the blood brain barrier and act as a neurokine to protect brain function during endurance exercise. However, the mechanism of transport from the blood to cerebrospinal fluid is unknown. Irisin has been detected in rodent and human brain and human cerebrospinal fluid by using commercial antibodies and enzyme linked immunosorbent assay kits. However, as human FNDC5 has an atypical translation start codon, some studies have questioned the specificity of commercial antibodies. Recently, human irisin was identified and quantitated in plasma by using mass spectrometry...
March 21, 2018: Peptides
https://www.readbyqxmd.com/read/29565774/muscle-hypertrophy-following-blood-flow-restricted-low-force-isometric-electrical-stimulation-in-rat-tibialis-anterior-role-for-muscle-hypoxia
#5
Toshiaki Nakajima, Seiichiro Koide, Tomohiro Yasuda, Takaaki Hasegawa, Tatsuya Yamasoba, Syotaro Obi, Shigeru Toyoda, Fumitaka Nakamura, Teruo Inoue, David C Poole, Yutaka Kano
Low force exercise training with blood flow restriction (BFR) elicits muscle hypertrophy. We investigated the effects of microvascular hypoxia (i.e., low microvascular O2 partial pressures, PmvO2 ) during contractions on hypertrophic signaling, growth response and key muscle adaptations for increasing exercise capacity. Wistar rats were fitted with a cuff placed around the upper thigh and inflated to restrict limb blood flow. Low force isometric contractions (30 Hz) were evoked via electrical stimulation of the tibialis anterior (TA) nerve...
March 22, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29558209/electrically-evoked-local-muscle-contractions-cause-an-increase-in-hippocampal-bdnf
#6
Takahiro Maekawa, Riki Ogasawara, Arata Tsutaki, Kihyuk Lee, Satoshi Nakada, Koichi Nakazato, Naokata Ishii
High-intensity exercise has recently been shown to cause an increase in brain-derived neurotropic factor (BDNF) in the hippocampus. Some studies have suggested that myokines secreted from contracting skeletal muscle, such as irisin (one of the truncated form of fibronectin type III domain-containing protein 5 (FNDC5)), play important roles in this process. Thus, we hypothesized that locally evoked muscle contractions may cause an increase of BDNF in the hippocampus through some afferent mechanisms. Under anesthesia, Sprague-Dawley rats were fixed on a custom-made dynamometer and their triceps surae muscles were made to maximally contract via delivery of electric stimulations of the sciatic nerve (100 Hz with 1-ms pulse and 3-s duration)...
March 20, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29524513/central-irisin-administration-affords-antidepressant-like-effect-and-modulates-neuroplasticity-related-genes-in-the-hippocampus-and-prefrontal-cortex-of-mice
#7
Aline Siteneski, Mauricio P Cunha, Vicente Lieberknecht, Francis L Pazini, Karen Gruhn, Patricia S Brocardo, Ana Lúcia S Rodrigues
Evidence has indicated that the practice of physical exercise has antidepressant effects that might be associated with irisin release and BDNF signaling. In this study we investigated the effects of the central administration of irisin or BDNF in predictive tests of antidepressant properties paralleled with the gene expression of peroxisome proliferator-activated receptor gamma co-activator 1α (PGC-1α), fibronectin type III domain-containing protein 5 (FNDC5) and brain-derived neurotrophic factor (BDNF) in the hippocampus and prefrontal cortex of mice...
June 8, 2018: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/29522296/the-diagnostic-value-of-fndc5-irisin-in-renal-cell-cancer
#8
Diler Us Altay, Esref Edip Keha, Ersagun Karagüzel, Ahmet Menteşe, Serap Ozer Yaman, Ahmet Alver
PURPOSES: The aim of this study was to determine the diagnostic significance of fibronectin type III domain containing protein 5 (FNDC5)/Irisin levels in the sera of patients with renal cell cancer. MATERIALS AND METHODS: In the study, 48 individuals were evaluated. The patient group included 23 subjects diagnosed with renal tumor, and the control group of 25 healthy individuals. Patients diagnosed with renal tumor received surgical treatment consisting of radical or partial nephrectomy...
March 9, 2018: International Braz J Urol: Official Journal of the Brazilian Society of Urology
https://www.readbyqxmd.com/read/29461897/rna-protein-discordant-expression-of-fndc5-in-central-nervous-system-is-likely-to-be-mediated-through-micrornas
#9
Somayeh Tanhaei, Parvaneh Nikpour, Kamran Ghaedi, Farzaneh Rabiee, Farshad Homayouni Moghadam, Mohammad Hossein Nasr-Esfahani
Fibronectin type III domain-containing 5 protein (Fndc5) is responsible for producing a secretory protein termed, "irisin." A modified expression of Fndc5 has been reported in different tissues during development, differentiation processes, as well as in metabolic events such as exercise. One of the important issues to be fixed is whether Fndc5 RNA level and protein content are concerted and modified hand in hand. Therefore, the aim of this study is to assess Fndc5 RNA and protein levels in various tissues of mouse and rat with emphasis on brain...
April 2018: DNA and Cell Biology
https://www.readbyqxmd.com/read/29415899/time-dependent-changes-in-increased-levels-of-plasma-irisin-and-muscle-pgc-1%C3%AE-and-fndc5-after-exercise-in-mice
#10
Minhui Pang, Jianwei Yang, Jiaming Rao, Haiqing Wang, Jiayi Zhang, Shengyong Wang, Xiongfei Chen, Xiaomei Dong
Exercise induces the expression of peroxisome proliferator-activated receptor gamma co-activator 1-α (PGC-1α) in skeletal muscle, which promotes the cleavage of fibronectin type III domain-containing protein 5 (FNDC5) to irisin. To explore the relationship between irisin and its regulators, we analyzed the plasma irisin levels and the muscle levels of FNDC5 and PGC-1α after exercise. Male C57BL/6J mice underwent a treadmill exercise (60% of VO2max ) for 30 min or one hour (h), and blood and gastrocnemius samples were collected before exercise (pre-exercise), immediately after exercise, and during 24-h recovery after 1-h exercise...
February 2018: Tohoku Journal of Experimental Medicine
https://www.readbyqxmd.com/read/29412381/obese-with-higher-fndc5-irisin-levels-have-a-better-metabolic-profile-lower-lipopolysaccharide-levels-and-type-2-diabetes-risk
#11
Ivan Luiz Padilha Bonfante, Mara Patricia Traina Chacon-Mikahil, Diego Trevisan Brunelli, Arthur Fernandes Gáspari, Renata Garbellini Duft, Alexandre Gabarra Oliveira, Tiago Gomes Araujo, Mario Jose Abdalla Saad, Cláudia Regina Cavaglieri
OBJECTIVE: Thus, the aim of this study was to compare if higher or smaller fibronectin type 3 domain-containing protein 5 (FNDC5)/irisin levels are associated with inflammatory and metabolic markers, caloric/macronutrient intake, physical fitness and type 2 diabetes mellitus (T2DM) risk in obese middle-aged men, and also to correlate all variables analyzed with FNDC5/irisin. SUBJECTS AND METHODS: On the basis of a cluster study, middle-aged obese men (IMC: 31.01 ± 1...
December 2017: Archives of Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29408625/maternal-and-neonatal-irisin-precursor-gene-fndc5-polymorphism-is-associated-with-preterm-birth
#12
Hagit Salem, Yekaterina Yatchenko, Mariana Anosov, Talya Rosenfeld, Gheona Altarescu, Sorina Grisaru-Granovsky, Ruth Birk
Irisin is a novel secreted myokine, encoded by the fibronectin type III domain-containing protein 5 (FNDC5) precursor gene. Irisin plays a role in the female reproductive system in pregnancy and in embryonic development, and is associated with fetal size. It is expressed in the ovary, placenta and neonatal cord serum. We studied whether maternal and neonatal FNDC5 genetic polymorphisms are associated with preterm birth (PTB). Blood for DNA analysis was collected from Israeli mothers (n = 315) and from umbilical veins of their respected idiopathic preterm (24-36 weeks) and control term (>37 weeks) newborns (n = 161)...
April 5, 2018: Gene
https://www.readbyqxmd.com/read/29374559/fndc5-attenuates-adipose-tissue-inflammation-and-insulin-resistance-via-ampk-mediated-macrophage-polarization-in-obesity
#13
Xiao-Qing Xiong, Zhi Geng, Bing Zhou, Feng Zhang, Ying Han, Ye-Bo Zhou, Jue-Jin Wang, Xing-Ya Gao, Qi Chen, Yue-Hua Li, Yu-Ming Kang, Guo-Qing Zhu
BACKGROUND: Obesity-induced chronic inflammation is critical in the pathogenesis of insulin resistance, and the recruitment and proinflammatory activation of adipose tissue macrophages (ATMs) is important for the development of this process. Here, we examined the effects of fibronectin type III domain-containing 5 (FNDC5) on inflammation and insulin resistance in high-fat diet-induced obese mice. MATERIALS AND METHODS: Male wild-type (WT) and FNDC5-/- mice were fed with standard chow (Ctrl) or high fat diet (HFD) for 20 weeks to induce obesity and insulin resistance...
January 25, 2018: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/29365291/a-comparative-study-on-the-effects-of-high-fat-diet-and-endurance-training-on-the-pgc-1%C3%AE-fndc5-irisin-pathway-in-obese-and-non-obese-male-c57bl-6-mice
#14
Fatemeh Kazeminasab, Sayed Mohammad Marandi, Kamran Ghaedi, Zahra Safaeinejad, Fahimeh Esfarjani, Mohammad Hossein Nasr-Esfahani
The present study was performed to clarify how a combined exercise/diet treatment could affect the expression level of the muscle Fndc5 with respect to the body fat mass. Male C57BL/6 mice were divided into 2 groups including low-fat (LF) and high-fat (HF) diets for 12 weeks. Then, LF fed (non-obese) and HF fed mice (obese), were divided into 4 groups: HF-Exercise, HF-Sedentary, LF-Exercise and LF-Sedentary. The exercise group received exercise, on a motor-driven treadmill for 45 min/day, 5 days/week during 8 weeks...
January 24, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29332162/roles-of-irisin-in-the-linkage-from-muscle-to-bone-during-mechanical-unloading-in-mice
#15
Naoyuki Kawao, Akihiro Moritake, Kohei Tatsumi, Hiroshi Kaji
Mechanical unloading induces disuse muscle atrophy and bone loss, but the details in mechanism involved in those pathophysiological conditions are not fully understood. Interaction between muscle and bone has been recently noted. Here, we investigated the roles of humoral factors linking muscle to bone during mechanical unloading using mice with hindlimb unloading (HU) and sciatic neurectomy (SNX). HU and SNX reduced muscle volume surrounding the tibia, tissue weights of soleus and gastrocnemius muscle, and trabecular bone mineral density (BMD) in the tibia of mice...
January 13, 2018: Calcified Tissue International
https://www.readbyqxmd.com/read/29322691/raspberry-supplementation-improves-insulin-signaling-and-promotes-brown-like-adipocyte-development-in-white-adipose-tissue-of-obese-mice
#16
Tong Xing, Yifei Kang, Xinglian Xu, Bo Wang, Min Du, Mei-Jun Zhu
SCOPE: Excessive lipid accumulation in white adipose tissue (WAT) leads to chronic inflammation and metabolic dysfunction. Raspberry (RB) contains high amount of polyphenols and dietary fibers. The objective of the study is to evaluate the effects of RB supplementation on WAT morphology, inflammation, and insulin signaling in high fat diet (HFD)-induced obese mice, and further explore the underlying mechanisms. METHODS AND RESULTS: C57BL/6J mice are fed with a control diet or a HFD supplemented with 0 or 5% freeze dried RB for 12 weeks...
March 2018: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/29303830/fibronectin-type-iii-domain-containing-5-attenuates-nlrp3-inflammasome-activation-and-phenotypic-transformation-of-adventitial-fibroblasts-in-spontaneously-hypertensive-rats
#17
Li Ling, Dan Chen, Ying Tong, Ying-Hao Zang, Xing-Sheng Ren, Hong Zhou, Xiao-Hong Qi, Qi Chen, Yue-Hua Li, Yu-Ming Kang, Guo-Qing Zhu
OBJECTIVE: Phenotypic transformation of adventitial fibroblasts is important in the pathogenesis of hypertension. This study was designed to determine whether fibronectin type III domain containing 5 (FNDC5) alleviates the phenotypic transformation of adventitial fibroblasts in hypertension and the underlying mechanisms. METHODS AND RESULTS: Experiments were carried out in spontaneously hypertensive rats (SHR) and Wistar-Kyoto rats (WKY) and primary aortic adventitial fibroblasts...
May 2018: Journal of Hypertension
https://www.readbyqxmd.com/read/29239022/fndc5-knockdown-induced-suppression-of-mitochondrial-integrity-and-significantly-decreased-cardiac-differentiation-of-mouse-embryonic-stem-cells
#18
Shima Nazem, Farzaneh Rabiee, Kamran Ghaedi, Sadegh Babashah, Majid Sadeghizadeh, Mohammad Hossein Nasr-Esfahani
Fibronectin type III domain-containing 5 protein (Fndc5) is a glycosylated protein with elevated expression in high energy demanded tissues as heart, brain, and muscle. It has been shown that upregulation of Fndc5 is regulated by peroxisome proliferator-activated receptor-γ coactivator-1 alpha (PGC-1α), which is known as a master regulator of mitochondrial function and biogenesis. Also, our group indicated that Fndc5 expression increases gradually during cardiac differentiation of mouse embryonic stem cells (mESCs)...
December 13, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29236301/synergistic-effect-of-carnosine-on-browning-of-adipose-tissue-in-exercised-obese-rats-a-focus-on-circulating-irisin-levels
#19
Mona F Schaalan, Basma K Ramadan, Azza H Abd Elwahab
The recent appreciation of the energy burning capacity of brown adipose tissue turns it to an attractive target for anti-obesity therapy. We sought to evaluate the effect of L-carnosine on browning of white adipose tissue in exercised obese rats. Sixty adult male Wistar albino rats, 7-8 week-old weighing 130-150 g, were allocated into six groups; with 10 rats in each, for an experimentation period of 12 weeks: (i) normal control rats fed a standard fat diet (SFD/control), (ii) normal control rats fed a standard diet and injected with L-carnosine (250 mg/kg, i...
June 2018: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29234478/fructose-ingestion-impairs-expression-of-genes-involved-in-skeletal-muscle-s-adaptive-response-to-aerobic-exercise
#20
Natalia Gomes Gonçalves, Stephanie Heffer Cavaletti, Carlos Augusto Pasqualucci, Milton Arruda Martins, Chin Jia Lin
Background: The inverse relationship between exercise capacity and its variation over time and both cardiovascular and all-cause mortality suggests the existence of an etiological nexus between cardiometabolic diseases and the molecular regulators of exercise capacity. Coordinated adaptive responses elicited by physical training enhance exercise performance and metabolic efficiency and possibly mediate the health benefits of physical exercise. In contrast, impaired expression of genes involved in mitochondrial biogenesis or protein turnover in skeletal muscle-key biological processes involved in adaptation to physical training-leads to insulin resistance and obesity...
2017: Genes & Nutrition
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