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Muscle molecular metabolism

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https://www.readbyqxmd.com/read/28428077/molecular-bases-of-the-crosstalk-between-bone-and-muscle
#1
Gerard Karsenty, Paula Mera
Exercise is an evolutionary conserved survival function that nowadays has beneficial health effects. The increased metabolic activity of contracting skeletal muscle affects the biology of many organs involved in regulating muscle functions. The discovery of hormones and cytokines secreted by bone and skeletal muscle during exercise, has recently added experimental credence to the notion that a crosstalk exists between these organs. Bone through the hormone osteocalcin, promotes exercise capacity in the mouse...
April 17, 2017: Bone
https://www.readbyqxmd.com/read/28428045/sco2-deficient-mice-develop-increased-adiposity-and-insulin-resistance
#2
Shauna Hill, Sathyaseelan S Deepa, Kavithalakshmi Sataranatarajan, Pavithra Premkumar, Daniel Pulliam, Yuhong Liu, Vanessa Y Soto, Kathleen E Fischer, Holly Van Remmen
Cytochrome c oxidase (COX) is an essential transmembrane protein complex (Complex IV) in the mitochondrial respiratory electron chain. Mutations in genes responsible for the assembly of COX are associated with Leigh syndrome, cardiomyopathy, spinal muscular atrophy and other fatal metabolic disorders in humans. Previous studies have shown that mice lacking the COX assembly protein Surf1 (Surf1(-/-) mice) paradoxically show a number of beneficial metabolic phenotypes including increased insulin sensitivity, upregulation of mitochondrial biogenesis, induction of stress response pathways and increased lifespan...
April 17, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28421465/the-role-of-the-molecular-clock-in-skeletal-muscle-and-what-it-is-teaching-us-about-muscle-bone-crosstalk
#3
REVIEW
Lance A Riley, Karyn A Esser
PURPOSE OF REVIEW: This review summarizes what has been learned about the interaction between skeletal muscle and bone from mouse models in which BMAL1, a core molecular clock protein has been deleted. Additionally, we highlight several genes which change following loss of BMAL1. The protein products from these genes are secreted from muscle and have a known effect on bone homeostasis. RECENT FINDINGS: Circadian rhythms have been implicated in regulating systems homeostasis through a series of transcriptional-translational feedback loops termed the molecular clock...
April 18, 2017: Current Osteoporosis Reports
https://www.readbyqxmd.com/read/28421373/role-of-glycogen-synthase-kinase-following-myocardial-infarction-and-ischemia-reperfusion
#4
REVIEW
S Ghaderi, N Alidadiani, N Dilaver, H R Heidari, R Parvizi, R Rahbarghazi, J Soleimani-Rad, B Baradaran
Glycogen synthase kinase-3 beta (GSK3β) is principally is a glycogen synthase phosphorylating enzyme that is well known for its role in muscle metabolism. GSK3β is a serine/threonine protein Kinase, which is responsible for several essential roles in mammalian cells. This enzyme is implicated in the pathophysiology of many conditions involved in homeostasis and cellular immigration. GSK3β is involved in several pathways leading to neurodegenerative diseases such as Alzheimer's disease and Parkinson's disease...
April 18, 2017: Apoptosis: An International Journal on Programmed Cell Death
https://www.readbyqxmd.com/read/28410879/determination-of-reference-genes-that-are-independent-of-feeding-rhythms-for-circadian-studies-of-mouse-metabolic-tissues
#5
Reiko Nakao, Hiroki Okauchi, Chiaki Hashimoto, Naoyuki Wada, Katsutaka Oishi
Real-time reverse transcription-polymerase chain reaction (RT-PCR) analysis is a popular method for the measurement of mRNA expression level and is a critical tool for basic research. The identification of suitable reference genes that are stable and not affected by experimental conditions is a critical step in the accurate normalization of RT-PCR. On the other hand, the levels of numerous transcripts exhibit circadian oscillation in various peripheral tissues and it is thought to be regulated by feeding rhythms in addition to the molecular circadian clock...
April 5, 2017: Molecular Genetics and Metabolism
https://www.readbyqxmd.com/read/28406477/mir-21-ablation-and-obeticholic-acid-ameliorate-nonalcoholic-steatohepatitis-in-mice
#6
Pedro M Rodrigues, Marta B Afonso, André L Simão, Catarina C Carvalho, Alexandre Trindade, António Duarte, Pedro M Borralho, Mariana V Machado, Helena Cortez-Pinto, Cecília Mp Rodrigues, Rui E Castro
microRNAs were recently suggested to contribute to the pathogenesis of nonalcoholic fatty liver disease (NAFLD), a disease lacking specific pharmacological treatments. In that regard, nuclear receptors are arising as key molecular targets for the treatment of nonalcoholic steatohepatitis (NASH). Here we show that, in a typical model of NASH-associated liver damage, microRNA-21 (miR-21) ablation results in a progressive decrease in steatosis, inflammation and lipoapoptosis, with impairment of fibrosis. In a complementary fast food (FF) diet NASH model, mimicking features of the metabolic syndrome, miR-21 levels increase in both liver and muscle, concomitantly with decreased expression of peroxisome proliferator-activated receptor α (PPARα), a key miR-21 target...
April 13, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28404815/the-hepatokine-fgf21-is-crucial-for-peroxisome-proliferator-activated-receptor-%C3%AE-agonist-induced-amelioration-of-metabolic-disorders-in-obese-mice
#7
Tsuyoshi Goto, Mariko Hirata, Yumeko Aoki, Mari Iwase, Haruya Takahashi, Minji Kim, Yongjia Li, Huei-Fen Jheng, Wataru Nomura, Nobuyuki Takahashi, Chu-Sook Kim, Rina Yu, Shigeto Seno, Hideo Matsuda, Megumi Aizawa-Abe, Ken Ebihara, Nobuyuki Itoh, Teruo Kawada
Obesity causes excess fat accumulation in white adipose tissues (WAT) and also in other insulin-responsive organs such as the skeletal muscle, increasing the risk for insulin resistance, which can lead to obesity-related metabolic disorders. Peroxisome proliferator-activated receptor-α (PPARα) is a master regulator of fatty acid oxidation, whose activator is known to improve hyperlipidemia. However, the molecular mechanisms underlying PPARα activator-mediated reduction in adiposity and improvement of metabolic disorders are largely unknown...
April 12, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28402325/the-bioenergetics-of-inflammation-insights-into-obesity-and-type-2-diabetes
#8
REVIEW
K N Keane, E K Calton, R Carlessi, P H Hart, P Newsholme
Diabetes mellitus is one of the most common chronic metabolic disorders worldwide, and its incidence in Asian countries is alarmingly high. Type 2 diabetes (T2DM) is closely associated with obesity, and the staggering rise in obesity is one of the primary factors related to the increased frequency of T2DM. Low-grade chronic inflammation is also accepted as an integral metabolic adaption in obesity and T2DM, and is believed to be a major player in the onset of insulin resistance. However, the exact mechanism(s) that cause a persistent chronic low-grade infiltration of leukocytes into insulin-target tissues such as adipose, skeletal muscle and liver are not entirely known...
April 12, 2017: European Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28395670/absence-of-physiological-ca-2-transients-is-an-initial-trigger-for-mitochondrial-dysfunction-in-skeletal-muscle-following-denervation
#9
Chehade Karam, Jianxun Yi, Yajuan Xiao, Kamal Dhakal, Lin Zhang, Xuejun Li, Carlo Manno, Jiejia Xu, Kaitao Li, Heping Cheng, Jianjie Ma, Jingsong Zhou
BACKGROUND: Motor neurons control muscle contraction by initiating action potentials in muscle. Denervation of muscle from motor neurons leads to muscle atrophy, which is linked to mitochondrial dysfunction. It is known that denervation promotes mitochondrial reactive oxygen species (ROS) production in muscle, whereas the initial cause of mitochondrial ROS production in denervated muscle remains elusive. Since denervation isolates muscle from motor neurons and deprives it from any electric stimulation, no action potentials are initiated, and therefore, no physiological Ca(2+) transients are generated inside denervated muscle fibers...
April 10, 2017: Skeletal Muscle
https://www.readbyqxmd.com/read/28391659/metabolic-control-of-myofibers-promising-therapeutic-target-for-obesity-and-type-2-diabetes
#10
REVIEW
Yehui Duan, Fengna Li, Bie Tan, Kang Yao, Yulong Yin
Mammalian skeletal muscles are composed of two major fibre types (I and II) that differ in terms of size, metabolism and contractile properties. In general, slow-twitch type I fibres are rich in mitochondria and have a greater insulin sensitivity than fast-twitch type II skeletal muscles. Although not widely appreciated, a forced induction of the slow skeletal muscle phenotype may inhibit the progress of obesity and diabetes. This potentially forms the basis for targeting slow/oxidative myofibers in the treatment of obesity...
April 9, 2017: Obesity Reviews: An Official Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/28390424/grmd-cardiac-and-skeletal-muscle-metabolism-gene-profiles-are-distinct
#11
Larry W Markham, Candice L Brinkmeyer-Langford, Jonathan H Soslow, Manisha Gupte, Douglas B Sawyer, Joe N Kornegay, Cristi L Galindo
BACKGROUND: Duchenne muscular dystrophy (DMD) is caused by mutations in the DMD gene, which codes for the dystrophin protein. While progress has been made in defining the molecular basis and pathogenesis of DMD, major gaps remain in understanding mechanisms that contribute to the marked delay in cardiac compared to skeletal muscle dysfunction. METHODS: To address this question, we analyzed cardiac and skeletal muscle tissue microarrays from golden retriever muscular dystrophy (GRMD) dogs, a genetically and clinically homologous model for DMD...
April 8, 2017: BMC Medical Genomics
https://www.readbyqxmd.com/read/28385599/intramyocellular-lipid-content-and-lipogenic-gene-expression-responses-following-a-single-bout-of-resistance-type-exercise-differ-between-young-and-older-men
#12
Kostas Tsintzas, Francis B Stephens, Tim Snijders, Benjamin T Wall, Scott Cooper, Joanne Mallinson, Lex B Verdijk, Luc J C van Loon
The aim of this study was to examine the temporal relationship between intramyocellular lipid (IMCL) content and the expression of genes associated with IMCL turnover, fat metabolism, and inflammation during recovery from an acute bout of resistance type exercise in old versus young men. Seven healthy young (23±2years, 77.2±2.9kg) and seven healthy older (72±1years, 79.3±4.9kg) males performed a single bout of resistance exercise involving 6 sets of 10 repetitions of leg press and 6 sets of 10 repetitions of leg extension at 75% one-repetition maximum (1-RM)...
April 3, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28384211/the-value-of-grip-test-lysophosphatidlycholines-glycerophosphocholine-ornithine-glucuronic-acid-decrement-in-assessment-of-nutritional-and-metabolic-characteristics-in-hepatitis-b-cirrhosis
#13
Qing Ye, Weili Yin, Lei Zhang, Huijuan Xiao, Yumei Qi, Shuye Liu, Baoxin Qian, Fengmei Wang, Tao Han
The liver is essential for the regulation of energy, protein and amino acids, as well as in other aspects of metabolism. To identify efficient indexes for evaluation of nutritional status and metabolic characteristics during different Child-Pugh stages of hepatitis B cirrhosis, 83 patients and 35 healthy individuals were enrolled in our study. We found that grip strength, triceps skinfold thickness (TSF), body fat and skeletal muscle of the patients were reduced compared to the control group (P<0.05). Ultra-high-performance liquid chromatography data combined with mass spectrometry (UPLC-MS) showed that levels of a variety of metabolites, including lysophosphatidylcholines (LysoPCs), glycerophosphocholine, ornithine and glucuronic acid were reduced in the serum of patients with hepatitis B cirrhosis (P<0...
2017: PloS One
https://www.readbyqxmd.com/read/28382782/fatty-acid-binding-protein-4-regulates-fatty-infiltration-after-rotator-cuff-tear-by-hypoxia-inducible-factor-1-in-mice
#14
Yong-Soo Lee, Ja-Yeon Kim, Kyung-Soo Oh, Seok Won Chung
BACKGROUND: Fatty infiltration in skeletal muscle is directly linked to loss of muscle strength and is associated with various adverse physical outcomes such as muscle atrophy, inflammation, insulin resistance, mobility impairments, and even mortality in the elderly. Aging, mechanical unloading, muscle injury, and hormonal imbalance are main causes of muscle fat accumulation, and the fat cells are derived from muscle stem cells via adipogenic differentiation. However, the pathogenesis and molecular mechanisms of fatty infiltration in muscles are still not fully defined...
April 5, 2017: Journal of Cachexia, Sarcopenia and Muscle
https://www.readbyqxmd.com/read/28381740/the-associations-between-circulating-bile-acids-and-the-muscle-volume-in-patients-with-non-alcoholic-fatty-liver-disease-nafld
#15
Yoshinao Kobayashi, Nagisa Hara, Ryosuke Sugimoto, Rumi Mifuji-Moroka, Hideaki Tanaka, Akiko Eguchi, Motoh Iwasa, Hiroshi Hasegawa, Kazuko Iwata, Yoshiyuki Takei, Osamu Taguchi
Objective Non-alcoholic fatty liver disease (NAFLD) is frequently associated with obesity, dyslipidemia and type-2 diabetes mellitus. Bile acids (BAs) bind to the farnesoid X receptor (FXR) and G protein-coupled receptor 5 (TGR5), which are involved in lipid and glucose metabolism and energy expenditure. The present study aimed to determine associations between the circulating BAs and the skeletal muscle volume (SMV), and lipid and glucose metabolism in patients with NAFLD. Methods Serum BAs and metabolic parameters were measured in 55 patients with NAFLD (median age, 55 years)...
2017: Internal Medicine
https://www.readbyqxmd.com/read/28376050/role-of-atf4-in-skeletal-muscle-atrophy
#16
Christopher M Adams, Scott M Ebert, Michael C Dyle
PURPOSE OF REVIEW: Here, we discuss recent work focused on the role of activating transcription factor 4 (ATF4) in skeletal muscle atrophy. RECENT FINDINGS: Muscle atrophy involves and requires widespread changes in skeletal muscle gene expression; however, the transcriptional regulatory proteins responsible for those changes are not yet well defined. Recent work indicates that some forms of muscle atrophy require ATF4, a stress-inducible bZIP transcription factor subunit that helps to mediate a broad range of stress responses in mammalian cells...
May 2017: Current Opinion in Clinical Nutrition and Metabolic Care
https://www.readbyqxmd.com/read/28371863/hypercontractile-mutant-of-ventricular-myosin-essential-light-chain-leads-to-disruption-of-sarcomeric-structure-and-function-and-results-in-restrictive-cardiomyopathy-in-mice
#17
Chen-Ching Yuan, Katarzyna Kazmierczak, Jingsheng Liang, Rosemeire Kanashiro-Takeuchi, Thomas C Irving, Aldrin V Gomes, Yihua Wang, Thomas P Burghardt, Danuta Szczesna-Cordary
Aims: The E143K (Glu→Lys) mutation in the myosin essential light chain (ELC) has been associated with restrictive cardiomyopathy (RCM) in humans, but the mechanisms that underlie the development of defective cardiac function are unknown. Using transgenic E143K-RCM mice, we sought to determine the molecular and cellular triggers of E143K-induced heart remodeling. Methods and Results: The E143K-induced abnormalities in cardiac function and morphology observed by echocardiography and invasive hemodynamics were paralleled by augmented active and passive tension measured in skinned papillary muscle fibers compared with wild-type (WT)-generated force...
March 23, 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/28349667/exercise-training-induced-improvement-in-skeletal-muscle-pgc-1%C3%AE-mediated-fat-metabolism-is-independent-of-dietary-glycemic-index
#18
Anny Mulya, Jacob M Haus, Thomas P J Solomon, Karen R Kelly, Steven K Malin, Michael Rocco, Hope Barkoukis, John P Kirwan
OBJECTIVE: This study hypothesized that a low-glycemic diet combined with exercise would increase expression of nuclear regulators of fat transport and oxidation in insulin-resistant skeletal muscle. METHOD: Nineteen subjects (64 ± 1 y; 34 ± 1 kg/m(2) ) were randomized to receive isocaloric high-glycemic-index (HiGIX; 80 ± 0.6 units, n = 10) or low-glycemic-index (LoGIX; 40 ± 0.3 units, n = 9) diets combined with supervised exercise (1 h/d, 5 d/wk at ∼85% HRmax ) for 12 weeks...
April 2017: Obesity
https://www.readbyqxmd.com/read/28347137/quantitative-proteomics-and-immunohistochemistry-reveal-insights-into-cellular-and-molecular-processes-in-the-infarct-border-zone-one-month-after-myocardial-infarction
#19
Libang Yang, Zachery R Gregorich, Wenxuan Cai, Patrick Zhang, Bernice Young, Yiwen Gu, Jianyi Zhang, Ying Ge
Postinfarction remodeling and expansion of the peri-infarct border zone (BZ) directly correlate with mortality following myocardial infarction (MI); however, the cellular and molecular mechanisms underlying remodeling processes in the BZ remain unclear. Herein, we utilized a label-free quantitative proteomics approach in combination with immunohistochemical analyses to gain a better understanding of processes contributing to postinfarction remodeling of the peri-infarct BZ in a swine model of MI with reperfusion...
April 7, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/28345649/proteomic-analysis-indicates-that-mitochondrial-energy-metabolism-in-skeletal-muscle-tissue-is-negatively-correlated-with-feed-efficiency-in-pigs
#20
Liangliang Fu, Yueyuan Xu, Ye Hou, Xiaolong Qi, Lian Zhou, Huiying Liu, Yu Luan, Lu Jing, Yuanxin Miao, Shuhong Zhao, Huazhen Liu, Xinyun Li
Feed efficiency (FE) is a highly important economic trait in pig production. Investigating the molecular mechanisms of FE is essential for trait improvement. In this study, the skeletal muscle proteome of high-FE and low-FE pigs were investigated by the iTRAQ approach. A total of 1780 proteins were identified, among which 124 proteins were differentially expressed between the high- and low-FE pigs, with 74 up-regulated and 50 down-regulated in the high-FE pigs. Ten randomly selected differentially expressed proteins (DEPs) were validated by Western blotting and quantitative PCR (qPCR)...
March 27, 2017: Scientific Reports
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