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Muscle protein synthesis

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https://www.readbyqxmd.com/read/28634643/acute-high-caffeine-exposure-increases-autophagic-flux-and-reduces-protein-synthesis-in-c2c12-skeletal-myotubes
#1
M A Hughes, R M Downs, G W Webb, C L Crocker, S T Kinsey, Bradley L Baumgarner
Caffeine is a highly catabolic dietary stimulant. High caffeine concentrations (1-10 mM) have previously been shown to inhibit protein synthesis and increase protein degradation in various mammalian cell lines. The purpose of this study was to examine the effect of short-term caffeine exposure on cell signaling pathways that regulate protein metabolism in mammalian skeletal muscle cells. Fully differentiated C2C12 skeletal myotubes either received vehicle (DMSO) or 5 mM caffeine for 6 h. Our analysis revealed that caffeine promoted a 40% increase in autolysosome formation and a 25% increase in autophagic flux...
June 20, 2017: Journal of Muscle Research and Cell Motility
https://www.readbyqxmd.com/read/28632510/itraq-based-quantitative-proteomic-analysis-of-lungs-in-murine-polymicrobial-sepsis-with-hydrogen-gas-treatment
#2
Yingxue Bian, Chao Qin, Yuchang Xin, Yang Yu, Hongguang Chen, Guolin Wang, Keliang Xie, Yonghao Yu
Sepsis-associated acute lung injury (ALI), which carries a high morbidity and mortality in patients, has no effective therapeutic strategies to date. Our group have already reported that hydrogen gas (H2) exerts a protective effect against sepsis in mice. However, the molecular mechanisms underlying H2 treatment are not fully understood. This study investigated the effects of H2 on lung injuries in septic mice through the iTRAQ-based quantitative proteomic analysis. Male ICR mice used in this study were subjected to cecal ligation and puncture (CLP) or sham operation...
June 19, 2017: Shock
https://www.readbyqxmd.com/read/28631809/anabolic-steroids-for-treating-pressure-ulcers
#3
REVIEW
Cho Naing, Maxine A Whittaker
BACKGROUND: Pressure ulcers, also known as bed sores, pressure sores or decubitus ulcers develop as a result of a localised injury to the skin or underlying tissue, or both. The ulcers usually arise over a bony prominence, and are recognised as a common medical problem affecting people confined to a bed or wheelchair for long periods of time. Anabolic steroids are used as off-label drugs (drugs which are used without regulatory approval) and have been used as adjuvants to usual treatment with dressings, debridement, nutritional supplements, systemic antibiotics and antiseptics, which are considered to be supportive in healing of pressure ulcers...
June 20, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28631391/myosin-substitution-rate-is-affected-by-the-amount-of-cytosolic-myosin-in-cultured-muscle-cells
#4
Koichi Ojima, Emi Ichimura, Yuya Yasukawa, Mika Oe, Susumu Muroya, Takahiro Suzuki, Jun-Ichi Wakamatsu, Takanori Nishimura
In striated muscles, approximately 300 myosin molecules form a single thick filament in myofibrils. Each myosin is continuously displaced by another myosin to maintain the thick filament structure. Our previous study using a fluorescence recovery after photobleaching (FRAP) technique showed that the myosin replacement rate is decreased by inhibition of protein synthesis, but myosin is still exchangeable. This result prompted us to examine whether myosin in the cytoplasm is involved in myosin replacement in myofibrils...
June 19, 2017: Animal Science Journal, Nihon Chikusan Gakkaihō
https://www.readbyqxmd.com/read/28630576/no-effect-of-a-whey-growth-factor-extract-during-resistance-training-on-strength-body-composition-or-hypertrophic-gene-expression-in-resistance-trained-young-men
#5
Michael J Dale, Alison M Coates, Peter R C Howe, Grant R Tomkinson, Matthew T Haren, Andrew Brown, Marissa Caldow, David Cameron-Smith, Jonathan D Buckley
Growth factors can be isolated from bovine milk to form a whey growth factor extract (WGFE). This study examined whether WGFE promoted activation of the AKT/mTOR pathway enabling increased lean tissue mass and strength in resistance trained men. Forty six men with >6 months of resistance training (RT) experience performed 12 weeks of RT. Participants consumed 20 g/day of whey protein and were randomised to receive either 1.6 g WGFE/day (WGFE; n = 22) or 1.6 g cellulose/day (control, CONT; n = 24). The primary outcome was leg press one-repetition maximum (LP1-RM) which was assessed at baseline, 6 and 12 weeks...
June 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28627027/elevated-serum-myostatin-level-is-associated-with-worse-survival-in-patients-with-liver-cirrhosis
#6
Hiroki Nishikawa, Hirayuki Enomoto, Akio Ishii, Yoshinori Iwata, Yuho Miyamoto, Noriko Ishii, Yukihisa Yuri, Kunihiro Hasegawa, Chikage Nakano, Takashi Nishimura, Kazunori Yoh, Nobuhiro Aizawa, Yoshiyuki Sakai, Naoto Ikeda, Tomoyuki Takashima, Ryo Takata, Hiroko Iijima, Shuhei Nishiguchi
BACKGROUND: We aimed to elucidate the relationship between serum myostatin levels and other markers including skeletal muscle mass and to investigate the influence of serum myostatin levels on survival for patients with liver cirrhosis (LC). METHODS: A total of 198 LC subjects were analysed in this study. Myostatin levels were measured using stored sera. We retrospectively investigated the relationship between myostatin level and other markers, and the influence of myostatin level on overall survival (OS)...
June 18, 2017: Journal of Cachexia, Sarcopenia and Muscle
https://www.readbyqxmd.com/read/28625951/evaluation-of-supplementing-active-peptide-s-effect-on-recovering-skeletal-muscle-micro-injury-after-track-and-field-exercises
#7
Caifeng Li, Zongyou Yang
To explore the effect of supplementing active peptide on recovering skeletal muscle injury after track and field exercises. METHOD: choose 80 patients (contain teenagers) with skeletal muscle micro-injury after the track and field exercises from March 2015 to July 2016, divide them into two groups. Normal treatment of micro-injury of skeletal muscle is given to the control group while active peptide is supplemented to the experimental group based on normal treatment. Compare the two groups to find the differences in relevant indexes of skeletal muscle after track and field exercises...
January 2017: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28621016/acute-effects-of-phenylbutyrate-on-glutamine-branched-chain-amino-acid-and-protein-metabolism-in-skeletal-muscles-of-rats
#8
Milan Holecek, Melita Vodenicarovova, Pavel Siman
Phenylbutyrate (PB) acts as chemical chaperone and histone deacetylase inhibitor, which is used to decrease ammonia in urea cycle disorders and has been investigated for use in the treatment of a number of lethal illnesses. We performed in vivo and in vitro experiments to examine the effects of PB on glutamine (GLN), branched-chain amino acid (BCAA; valine, leucine and isoleucine) and protein metabolism in rats. In the first study, animals were sacrificed one hour after three injections of PB (300mg/kg b...
June 16, 2017: International Journal of Experimental Pathology
https://www.readbyqxmd.com/read/28618224/design-synthesis-and-structure-activity-relationship-of-tetrahydropyrido-4-3-d-pyrimidine-derivatives-as-potent-smoothened-antagonists-with-in-vivo-activity
#9
Wenfeng Lu, Yongqiang Liu, Haikuo Ma, Jiyue Zheng, Sheng Tian, Zhijian Sun, Lusong Luo, Jiajun Li, Hongjian Zhang, Zeng-Jie Yang, Xiaohu Zhang
Medulloblastoma is one of the most prevalent brain tumors in children. Aberrant hedgehog (Hh) pathway signaling is thought to be involved in the initiation and development of medulloblastoma. Vismodegib, the first FDA-approved cancer therapy based on inhibition of aberrant hedgehog signaling, targets smoothened (Smo), a G-protein coupled receptor (GPCR) central to the Hh pathway. Although vismodegib exhibits promising therapeutic efficacy in tumor treatment, concerns have been raised from its non-linear pharmacokinetic (PK) profiles at high doses partly due to low aqueous solubility...
June 15, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28615698/divergent-anabolic-signalling-responses-of-murine-soleus-and-tibialis-anterior-muscles-to-chronic-2g-hypergravity
#10
Timur Mirzoev, Sergey Tyganov, Irina Petrova, Vasily Gnyubkin, Norbert Laroche, Laurence Vico, Boris Shenkman
The purpose of the study was to assess the rate of protein synthesis (PS) and elucidate signalling pathways regulating PS in mouse soleus (Sol) and tibialis anterior (TA) muscles following chronic hypergravity (30-day centrifugation at 2G). The content of the key signalling proteins of the various anabolic signalling pathways was determined by Western-blotting. The rate of PS was assessed using in-vivo SUnSET technique. An exposure to 2G centrifugation did not induce any significant changes in the rate of PS as well as phosphorylation status of the key anabolic markers (AKT, p70s6k, 4E-BP1, GSK-3beta, eEF2) in Sol...
June 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28615380/leucine-differentially-regulates-gene-specific-translation-in-mouse-skeletal-muscle
#11
Micah J Drummond, Paul T Reidy, Lisa M Baird, Brian K Dalley, Michael T Howard
Background: Amino acids, especially leucine, are particularly effective in promoting protein synthesis. Leucine is known to increase the rate of protein synthesis in skeletal muscle through the mechanistic target of rapamycin complex 1-dependent, as well as -independent, signaling pathways. However, the overall translation program is poorly defined, and it is unknown how the activation of these pathways differentially controls the translation of specific mRNAs.Objective: Ribosome profiling and RNA sequencing were used to precisely define the translational program activated by an acute oral dose of leucine...
June 14, 2017: Journal of Nutrition
https://www.readbyqxmd.com/read/28607086/specific-targeting-of-tgf-%C3%AE-family-ligands-demonstrates-distinct-roles-in-the-regulation-of-muscle-mass-in-health-and-disease
#12
Justin L Chen, Kelly L Walton, Adam Hagg, Timothy D Colgan, Katharine Johnson, Hongwei Qian, Paul Gregorevic, Craig A Harrison
The transforming growth factor-β (TGF-β) network of ligands and intracellular signaling proteins is a subject of intense interest within the field of skeletal muscle biology. To define the relative contribution of endogenous TGF-β proteins to the negative regulation of muscle mass via their activation of the Smad2/3 signaling axis, we used local injection of adeno-associated viral vectors (AAVs) encoding ligand-specific antagonists into the tibialis anterior (TA) muscles of C57BL/6 mice. Eight weeks after AAV injection, inhibition of activin A and activin B signaling produced moderate (∼20%), but significant, increases in TA mass, indicating that endogenous activins repress muscle growth...
June 12, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28606794/antifibrotic-actions-of-peroxisome-proliferator-activated-receptor-%C3%AE-ligands-in-corneal-fibroblasts-are-mediated-by-%C3%AE-catenin-regulated-pathways
#13
Kye-Im Jeon, Richard P Phipps, Patricia J Sime, Krystel R Huxlin
Wound healing after corneal injury typically involves fibrosis, with transforming growth factor β1 (TGF-β1) as one of its strongest mediators. A class of small molecules-peroxisome proliferator-activated receptor γ (PPARγ) ligands-exert potent antifibrotic effects in the cornea by blocking phosphorylation of p38 mitogen-activated protein kinase (MAPK). However, why this blocks fibrosis remains unknown. Herein, we show that PPARγ ligands (rosiglitazone, troglitazone, and 15-deoxy-Δ12,14-prostaglandin J2) decrease levels of β-catenin...
June 10, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/28605113/muscle-carnitine-availability-plays-a-central-role-in-regulating-fuel-metabolism-in-the-rodent
#14
Craig Porter, Dumitru Constantin-Teodosiu, Despina Constantin, Brendan Leighton, Simon M Poucher, Paul L Greenhaff
The body carnitine pool is primarily confined to skeletal muscle, where it regulates carbohydrate (CHO) and fat usage. Mildronate (3-(2,2,2-trimethylhydrazinium)-propionate) inhibits carnitine synthesis and tissue uptake, but the impact of carnitine depletion on whole-body fuel selection, muscle fuel metabolism and its molecular regulation is under-investigated. Male lean Zucker rats received water (control, n = 8) or mildronate-supplemented water (mildronate, n = 8) for 10 days (1.6 g kg(-1) body mass (bm)(...
June 12, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28604513/severe-sarcopenia-and-increased-fat-stores-in-pediatric-patients-with-liver-kidney-or-intestine-failure
#15
Richard S Mangus, Weston J Bush, Chandrashekhar A Kubal, Christina Miller
OBJECTIVES: Malnutrition and wasting predict clinical outcomes in children with severe chronic illness. Objectively calculated malnutrition in children with end-stage organ failure has not been well studied. This analysis compares children with kidney, liver or intestine failure to healthy controls to quantitate the disparity in muscle and fat stores. METHODS: Children younger than age 19 with end stage liver, kidney or intestine failure and with pre-transplant computed tomography (CT) imaging were selected from the transplant database...
June 9, 2017: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/28596275/skeletal-muscle-morphology-protein-synthesis-and-gene-expression-in-ehlers-danlos-syndrome
#16
Rie H Nygaard, Jacob K Jensen, Nicol C Voermans, Katja Maria Heinemeier, Peter Schjerling, Lars Holm, Jakob Agergaard, Abigail Louise Mackey, Jesper Løvind Andersen, Lars Remvig, Michael Kjaer
INTRODUCTION: Patients with Ehlers Danlos Syndrome are known to have genetically impaired connective tissue and skeletal muscle symptoms in form of pain, fatigue and cramps, however earlier studies have not been able to link these symptoms to morphological muscle changes. METHODS: We obtained skeletal muscle biopsies in patients with classic EDS (cEDS, n=5 (Denmark)+ 8 (The Netherlands)) and vascular EDS (vEDS, n=3) and analyzed muscle fiber morphology and content (Western blotting and muscle fiber type/area distributions) and muscle mRNA expression and protein synthesis rate (RT-PCR and stable isotope technique)...
June 8, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28596270/timing-of-post-exercise-carbohydrate-protein-supplementation-roles-of-gastrointestinal-blood-flow-and-mucosal-cell-damage-on-gastric-emptying-in-humans
#17
Hideaki Kashima, Nao Harada, Kanae Miyamoto, Masaki Fujimoto, Chiaki Fujita, Masako Yamaoka Endo, Toshio Kobayashi, Akira Miura, Yoshiyuki Fukuba
It is well known that protein ingestion immediately after exercise greatly stimulates muscle protein synthesis during the post-exercise recovery phase. However, immediately after strenuous exercise, the gastrointestinal (GI) mucosa is frequently injured by hypoperfusion in the organ/tissue, possibly resulting in impaired GI function (e.g., gastric emptying; GE). The aim of this study was to examine the effect of GI blood flow on the GE rate. Eight healthy young subjects performed an intermittent supramaximal cycling exercise for 30 min, which consisted of a 120% VO2 peak for 20 s, followed by 20 W for 40 s...
June 8, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28595527/creatine-supplementation-and-skeletal-muscle-metabolism-for-building-muscle-mass-review-of-the-potential-mechanisms-of-action
#18
Farnaz Farshidfar, Mark A Pinder, Semone B Myrie
Creatine, a very popular supplement among athletic populations, is of growing interest for clinical applications. Since over 90% of creatine is stored in skeletal muscle, the effect of creatine supplementation on muscle metabolism is a widely studied area. While numerous studies over the past few decades have shown that creatine supplementation has many favorable effects on skeletal muscle physiology and metabolism, including enhancing muscle mass (growth/hypertrophy); the underlying mechanisms are poorly understood...
June 5, 2017: Current Protein & Peptide Science
https://www.readbyqxmd.com/read/28594869/compound-heterozygous-mutations-in-glycyl-trna-synthetase-gars-cause-mitochondrial-respiratory-chain-dysfunction
#19
Michael Nafisinia, Lisa G Riley, Wendy A Gold, Kaustuv Bhattacharya, Carolyn R Broderick, David R Thorburn, Cas Simons, John Christodoulou
Glycyl-tRNA synthetase (GARS; OMIM 600287) is one of thirty-seven tRNA-synthetase genes that catalyses the synthesis of glycyl-tRNA, which is required to insert glycine into proteins within the cytosol and mitochondria. To date, eighteen mutations in GARS have been reported in patients with autosomal-dominant Charcot-Marie-Tooth disease type 2D (CMT2D; OMIM 601472), and/or distal spinal muscular atrophy type V (dSMA-V; OMIM 600794). In this study, we report a patient with clinical and biochemical features suggestive of a mitochondrial respiratory chain (MRC) disorder including mild left ventricular posterior wall hypertrophy, exercise intolerance, and lactic acidosis...
2017: PloS One
https://www.readbyqxmd.com/read/28594135/the-igf-1-akt-s6-pathway-and-expressions-of-glycolytic-myosin-heavy-chain-isoforms-are-upregulated-in-chicken-skeletal-muscle-during-the-first-week-after-hatching
#20
Takaoki Saneyasu, Tatsuya Tsuchihashi, Ayana Kitashiro, Nami Tsuchii, Sayaka Kimura, Kazuhisa Honda, Hiroshi Kamisoyama
Skeletal muscle mass is an important trait in the animal industry. We previously reported an age-dependent downregulation of the insulin-like growth factor 1 (IGF-1)/Akt/S6 pathway, major protein synthesis pathway, in chicken breast muscle after 1 week of age, despite a continuous increase of breast muscle weight. Myosin heavy chain (HC), a major protein in muscle fiber, has several isoforms depending on chicken skeletal muscle types. HC I (fast-twitch glycolytic type) is known to be expressed in adult chicken breast muscle...
June 8, 2017: Animal Science Journal, Nihon Chikusan Gakkaihō
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