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https://www.readbyqxmd.com/read/27922115/perilipin-5-fine-tunes-lipid-oxidation-to-metabolic-demand-and-protects-against-lipotoxicity-in-skeletal-muscle
#1
Claire Laurens, Virginie Bourlier, Aline Mairal, Katie Louche, Pierre-Marie Badin, Etienne Mouisel, Alexandra Montagner, André Marette, Angelo Tremblay, John S Weisnagel, Hervé Guillou, Dominique Langin, Denis R Joanisse, Cedric Moro
Lipid droplets (LD) play a central role in lipid homeostasis by controlling transient fatty acid (FA) storage and release from triacylglycerols stores, while preventing high levels of cellular toxic lipids. This crucial function in oxidative tissues is altered in obesity and type 2 diabetes. Perilipin 5 (PLIN5) is a LD protein whose mechanistic and causal link with lipotoxicity and insulin resistance has raised controversies. We investigated here the physiological role of PLIN5 in skeletal muscle upon various metabolic challenges...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27922103/hypothalamic-activation-is-essential-for-endotoxemia-induced-acute-muscle-wasting
#2
Kaipeng Duan, Qiyi Chen, Minhua Cheng, Chenyan Zhao, Zhiliang Lin, Shanjun Tan, Fengchan Xi, Tao Gao, Jialiang Shi, Juanhong Shen, Weiqin Li, Wenkui Yu, Jieshou Li, Ning Li
Growing evidence suggests acute skeletal muscle wasting is a key factor affecting nutritional support and prognosis in critical patients. Previously, plenty of studies of muscle wasting focused on the peripheral pathway, little was known about the central role. We tested the hypothesis whether central inflammatory pathway and neuropeptides were involved in the process. In lipopolysaccharide (LPS) treated rats, hypothalamic NF-κB pathway and inflammation were highly activated, which was accompanied with severe muscle wasting...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27922100/evaluation-of-candidate-reference-genes-for-rt-qpcr-studies-in-three-metabolism-related-tissues-of-mice-after-caloric-restriction
#3
Huan Gong, Liang Sun, Beidong Chen, Yiwen Han, Jing Pang, Wei Wu, Ruomei Qi, Tie-Mei Zhang
Reverse transcription quantitative-polymerase chain reaction (RT-qPCR) is a routine method for gene expression analysis, and reliable results depend on proper normalization by stable reference genes. Caloric restriction (CR) is a robust lifestyle intervention to slow aging and delay onset of age-associated diseases via inducing global changes in gene expression. Reliable normalization of RT-qPCR data becomes crucial in CR studies. In this study, the expression stability of 12 candidate reference genes were evaluated in inguinal white adipose tissue (iWAT), skeletal muscle (Sk...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27921261/attempting-to-compensate-for-reduced-neuronal-nitric-oxide-synthase-protein-with-nitrate-supplementation-cannot-overcome-metabolic-dysfunction-but-rather-has-detrimental-effects-in-dystrophin-deficient-mdx-muscle
#4
Cara A Timpani, Adam J Trewin, Vanesa Stojanovska, Ainsley Robinson, Craig A Goodman, Kulmira Nurgali, Andrew C Betik, Nigel Stepto, Alan Hayes, Glenn K McConell, Emma Rybalka
Duchenne muscular dystrophy arises from the loss of dystrophin and is characterized by calcium dysregulation, muscular atrophy, and metabolic dysfunction. The secondary reduction of neuronal nitric oxide synthase (nNOS) from the sarcolemma reduces NO production and bioavailability. As NO modulates glucose uptake, metabolism, and mitochondrial bioenergetics, we investigated whether an 8-week nitrate supplementation regimen could overcome metabolic dysfunction in the mdx mouse. Dystrophin-positive control (C57BL/10) and dystrophin-deficient mdx mice were supplemented with sodium nitrate (85 mg/l) in drinking water...
December 5, 2016: Neurotherapeutics: the Journal of the American Society for Experimental NeuroTherapeutics
https://www.readbyqxmd.com/read/27921211/helix-o-modulates-voltage-dependency-of-clc-1
#5
Ju Yong Seong, Kotdaji Ha, Chansik Hong, Jongyun Myeong, Hyun-Ho Lim, Dongki Yang, Insuk So
The chloride channel (CLC) family of proteins consists of channels and transporters that share similarities in architecture and play essential roles in physiological functions. Among the CLC family, CLC-1 channels have the representative homodimeric double-barreled structure carrying two gating processes. One is protopore gating that acts on each pore independently by glutamate residue (Eext). The other is common gating that closes both pores simultaneously in association with large conformational changes across each subunit...
December 5, 2016: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/27920252/group-i-paks-promote-skeletal-myoblast-differentiation-in-vivo-and-in-vitro
#6
Giselle A Joseph, Min Lu, Maria Radu, Jennifer K Lee, Steven J Burden, Jonathan Chernoff, Robert S Krauss
Skeletal myogenesis is regulated by signal transduction, but the factors and mechanisms involved are not well understood. The group I Paks, Pak1 and Pak2, are related protein kinases and direct effectors of Cdc42 and Rac1. Group I Paks are ubiquitously expressed and specifically required for myoblast fusion in Drosophila We report that both Pak1 and Pak2 are activated during mammalian myoblast differentiation. One pathway of activation is initiated by N-cadherin ligation, and involves the cadherin co-receptor Cdo with its downstream effector, Cdc42...
December 5, 2016: Molecular and Cellular Biology
https://www.readbyqxmd.com/read/27920043/a-historical-perspective-on-crush-syndrome-the-clinical-application-of-its-pathogenesis-established-by-the-study-of-wartime-crush-injuries
#7
REVIEW
Dilini Peiris
Crush syndrome is a fine example of how pathology can play a direct role in revealing the best treatment and management for diseases. It can occur when crush injuries are sustained. Skeletal muscle becomes damaged under the weight of a heavy object, and victims experience severe shock and renal failure. The discovery of the pathology of crush syndrome belongs to two individuals: Seigo Minami and Eric Bywaters. They separately helped to define the pathogenesis of crush syndrome during World Wars I and II. Seigo Minami is believed to have been the first to record the pathogenesis of crush syndrome...
December 5, 2016: Journal of Clinical Pathology
https://www.readbyqxmd.com/read/27920002/decreased-skeletal-muscle-mass-after-neoadjuvant-therapy-correlates-with-poor-prognosis-in-patients-with-esophageal-cancer
#8
Jiajia Liu, Satoru Motoyama, Yusuke Sato, Akiyuki Wakita, Yuta Kawakita, Hajime Saito, Yoshihiro Minamiya
BACKGROUND: Loss of skeletal muscle is predictive of a poor prognosis in patients with various malignant lesions. Our aim was to determine whether changes in skeletal muscle after neo-adjuvant therapy (NAT) predict prognosis in patients with esophageal squamous cell carcinoma (ESCC) undergoing esophagectomy. PATIENTS AND METHODS: The cross-sectional areas of the psoas muscles were measured on computed tomographic images collected at the initial visit, preoperatively and postoperatively in 84 patients...
December 2016: Anticancer Research
https://www.readbyqxmd.com/read/27919820/tnf-%C3%AE-and-cancer-cachexia-molecular-insights-and-clinical-implications
#9
REVIEW
Hetal J Patel, Bhoomika M Patel
Cancer cachexia characterized by a chronic wasting syndrome, involves skeletal muscle loss and adipose tissue loss and resistance to conventional nutritional support. Cachexia is responsible for the reduction in quality and length of life of cancer patients. It also decreases the muscle strength of the patients. The pro-inflammatory and pro-cachectic factors produced by the tumor cells have important role in genesis of cachexia. A number of pro-inflammatory cytokines, like interleukin-1 (IL-1), IL-6, tumor necrosis factor- alpha (TNF-α) may have important role in the pathological mechanisms of cachexia in cancer...
December 2, 2016: Life Sciences
https://www.readbyqxmd.com/read/27918964/sarcopenia-in-older-mice-is-characterized-by-a-decreased-anabolic-response-to-a-protein-meal
#10
Miriam van Dijk, Jolanda Nagel, Francina J Dijk, Jerôme Salles, Sjors Verlaan, Stephane Walrand, Klaske van Norren, Yvette Luiking
Ageing is associated with sarcopenia, a progressive decline of skeletal muscle mass, muscle quality and muscle function. Reduced sensitivity of older muscles to respond to anabolic stimuli, i.e. anabolic resistance, is part of the underlying mechanisms. Although, muscle parameters have been studied in mice of various ages/strains; the aim was to study if mice display similar deteriorating processes as human ageing. Therefore, 10,16,21 and 25 months-old C57BL6/6J male mice were studied to measure parameters of sarcopenia and factors contributing to its pathophysiology, with the aim of characterizing sarcopenia in old mice...
November 27, 2016: Archives of Gerontology and Geriatrics
https://www.readbyqxmd.com/read/27918914/transformation-of-jaw-muscle-satellite-cells-to-cardiomyocytes
#11
Randall S Daughters, Susan A Keirstead, Jonathan M W Slack
In the embryo a population of progenitor cells known as the second heart field forms not just parts of the heart but also the jaw muscles of the head. Here we show that it is possible to take skeletal muscle satellite cells from jaw muscles of the adult mouse and to direct their differentiation to become heart muscle cells (cardiomyocytes). This is done by exposing the cells to extracellular factors similar to those which heart progenitors would experience during normal embryonic development. By contrast, cardiac differentiation does not occur at all from satellite cells isolated from trunk and limb muscles, which originate from the somites of the embryo...
December 2, 2016: Differentiation; Research in Biological Diversity
https://www.readbyqxmd.com/read/27917127/maternal-high-fat-diet-alters-skeletal-muscle-mitochondrial-catalytic-activity-in-adult-male-rat-offspring
#12
Chantal A Pileggi, Christopher P Hedges, Stephanie A Segovia, James F Markworth, Brenan R Durainayagam, Clint Gray, Xiaoyuan D Zhang, Matthew P G Barnett, Mark H Vickers, Anthony J R Hickey, Clare M Reynolds, David Cameron-Smith
A maternal high-fat (HF) diet during pregnancy can lead to metabolic compromise, such as insulin resistance in adult offspring. Skeletal muscle mitochondrial dysfunction is one mechanism contributing to metabolic impairments in insulin resistant states. Therefore, the present study aimed to investigate whether mitochondrial dysfunction is evident in metabolically compromised offspring born to HF-fed dams. Sprague-Dawley dams were randomly assigned to receive a purified control diet (CD; 10% kcal from fat) or a high fat diet (HFD; 45% kcal from fat) for 10 days prior to mating, throughout pregnancy and during lactation...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27916799/pre-sleep-protein-ingestion-to-improve-the-skeletal-muscle-adaptive-response-to-exercise-training
#13
REVIEW
Jorn Trommelen, Luc J C van Loon
Protein ingestion following resistance-type exercise stimulates muscle protein synthesis rates, and enhances the skeletal muscle adaptive response to prolonged resistance-type exercise training. As the adaptive response to a single bout of resistance exercise extends well beyond the first couple of hours of post-exercise recovery, recent studies have begun to investigate the impact of the timing and distribution of protein ingestion during more prolonged recovery periods. Recent work has shown that overnight muscle protein synthesis rates are restricted by the level of amino acid availability...
November 28, 2016: Nutrients
https://www.readbyqxmd.com/read/27916793/histone-h3-methyltransferase-suv39h1-prevents-myogenic-terminal-differentiation-by-repressing-mef2-activity-in-muscle-cells
#14
Wei Jin, Yangyang Shang, Jian Peng, Siwen Jiang
The myogenic regulatory factors (MRFs) and myocyte enhancer factor 2 (MEF2) transcription factors have been extensively studied as key transcription factors that regulate myogenic gene expression. However, few reports on the molecular mechanism that modulates chromatin remodeling during skeletal muscle differentiation are available. We reported here that the expression of the H3-K9 methyltransferase Suv39h1 was decreased during myoblast differentiation. Ectopic expression of Suv39h1 could inhibit myoblast differentiation, increasing H3-K9 methylation levels, whereas knockdown of Suv39h1 stimulated myoblast differentiation...
November 28, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27916783/reduction-of-visceral-fat-by-liraglutide-is-associated-with-ameliorations-of-hepatic-steatosis-albuminuria-and-micro-inflammation-in-type-2-diabetic-patients-with-insulin-treatment-a-randomized-control-trial
#15
Ryotaro Bouchi, Yujiro Nakano, Tatsuya Fukuda, Takato Takeuchi, Masanori Murakami, Isao Minami, Hajime Izumiyama, Koshi Hashimoto, Takanobu Yoshimoto, Yoshihiro Ogawa
Liraglutide, an analogue of human glucagon-like peptide 1, reduces cardiovascular events in patients with type 2 diabetes; however, it has still been unknown by which mechanisms liraglutide could reduce cardiovascular events. Type 2 diabetic patients with insulin treatment were enrolled in this randomized, open-label, comparative study. Participants were randomly assigned to liraglutide plus insulin (liraglutide group) and insulin treatment (control group) at 1:1 allocation. Primary endpoint was the change in viscera fat are (VFA, cm(2)) at 24 weeks...
December 3, 2016: Endocrine Journal
https://www.readbyqxmd.com/read/27916754/-autoantibodies-of-inflammatory-myopathies-update
#16
Shigeaki Suzuki
Inflammatory myopathies are a heterogeneous group of immune-mediated diseases that involve the skeletal muscle as well as many other organs. In addition to a histological diagnosis at muscle biopsy, the clinical phenotypes of inflammatory myopathies can be defined by the presence of various autoantibodies that are originally detected by RNA or protein immunoprecipitation. However, the correlation between histological features and autoantibodies has not been fully elucidated. Immune-mediated necrotizing myopathy (IMNM), which is characterized by significant necrotic and regeneration muscle fibers with minimal or no inflammatory cell infiltration, is associated with the presence of autoantibodies...
December 2016: Brain and Nerve, Shinkei Kenkyū No Shinpo
https://www.readbyqxmd.com/read/27916646/roles-of-peroxisome-proliferator-activated-receptor-%C3%AE-%C3%AE-in-skeletal-muscle-physiology
#17
REVIEW
Ravikumar Manickam, Walter Wahli
More than two decades of studying peroxisome proliferator-activated receptors (PPARs) has led to an understanding of their implications in various physiological processes that are key for health and disease. All three PPAR isotypes, PPARα, PPARβ/δ, and PPARγ, are activated by a variety of molecules, including fatty acids, eicosanoids and phospholipids, and regulate a spectrum of genes involved in development, lipid and carbohydrate metabolism, inflammation, and proliferation and differentiation of many cell types in different tissues...
December 1, 2016: Biochimie
https://www.readbyqxmd.com/read/27916644/targeted-mitochondrial-uncoupling-beyond-ucp1-the-fine-line-between-death-and-metabolic-health
#18
REVIEW
Mario Ost, Susanne Keipert, Susanne Klaus
In the early 1930s, the chemical uncoupling agent 2,4-dinitrophenol (DNP) was promoted for the very first time as a powerful and effective weight loss pill but quickly withdrawn from the market due to its lack of tissue-selectivity with resulting dangerous side effects, including hyperthermia and death. Today, novel mitochondria- or tissue-targeted chemical uncouplers with higher safety and therapeutic values are under investigation in order to tackle obesity, diabetes and fatty liver disease. Moreover, in the past 20 years, transgenic mouse models were generated to understand the molecular and metabolic consequences of targeted uncoupling, expressing functional uncoupling protein 1 (UCP1) ectopically in white adipose tissue or skeletal muscle...
December 1, 2016: Biochimie
https://www.readbyqxmd.com/read/27916643/homeostatic-effects-of-exercise-and-sleep-on-metabolic-processes-in-mice-with-an-overexpressed-skeletal-muscle-clock
#19
Allison J Brager, Lydia Heemstra, Raman Bhambra, J Christopher Ehlen, Karyn A Esser, Ketema N Paul, Colleen M Novak
Brain and muscle-ARNT-like factor (Bmal1/BMAL1) is an essential transcriptional/translational factor of circadian clocks. Loss of function of Bmal1/BMAL1 is highly disruptive to physiological and behavioral processes. In light of these previous findings, we examined if transgenic overexpression of Bmal1/BMAL1 in skeletal muscle could alter metabolic processes. First, we characterized in vivo and ex vivo metabolic phenotypes of muscle overexpressed mice (male and female) compared to wild-type littermates (WT)...
December 1, 2016: Biochimie
https://www.readbyqxmd.com/read/27916530/enhanced-respiratory-chain-supercomplex-formation-in-response-to-exercise-in-human-skeletal-muscle
#20
Chiara Greggio, Pooja Jha, Sameer S Kulkarni, Sylviane Lagarrigue, Nicholas T Broskey, Marie Boutant, Xu Wang, Sonia Conde Alonso, Emmanuel Ofori, Johan Auwerx, Carles Cantó, Francesca Amati
Mitochondrial dysfunction is a hallmark of multiple metabolic complications. Physical activity is known to increase mitochondrial content in skeletal muscle, counteracting age-related decline in muscle function and protecting against metabolic and cardiovascular complications. Here, we investigated the effect of 4 months of exercise training on skeletal muscle mitochondria electron transport chain complexes and supercomplexes in 26 healthy, sedentary older adults. Exercise differentially modulated respiratory complexes...
November 28, 2016: Cell Metabolism
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