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skeletal protein synthesis

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https://www.readbyqxmd.com/read/28294417/progressive-resistance-loaded-voluntary-wheel-running-increases-hypertrophy-and-differentially-affects-muscle-protein-synthesis-ribosome-biogenesis-and-proteolytic-markers-in-rat-muscle
#1
C B Mobley, A M Holland, W C Kephart, P W Mumford, R P Lowery, A N Kavazis, J M Wilson, M D Roberts
We examined if 6 weeks of progressive resistance-loaded voluntary wheel running in rats induced plantaris, soleus, and/or gastrocnemius hypertrophy and/or affected markers of translational efficiency, ribosome biogenesis, and markers of proteolysis. For 6 weeks, 8 male Sprague-Dawley rats (~9-10 weeks of age, ~300-325 g) rats were assigned to the progressive resistance-loaded voluntary wheel running model (EX), and ten rats were not trained (SED). For EX rats, the wheel-loading paradigm was as follows - days 1-7: free-wheel resistance, days 8-15: wheel resistance set to 20%-25% body mass, days 16-24: 40% body mass, days 25-32: 60% body mass, days 33-42: 40% body mass...
March 15, 2017: Journal of Animal Physiology and Animal Nutrition
https://www.readbyqxmd.com/read/28286738/tsc2-rheb-signaling-mediates-erk-dependent-regulation-of-mtorc1-activity-in-c2c12-myoblasts
#2
Mitsunori Miyazaki, Tohru Takemasa
The enhanced rate of protein synthesis in skeletal muscle cells results in a net increase in total protein content that leads to skeletal muscle growth/hypertrophy. The mitogen-activated protein kinase kinase (MEK)/extracellular signal-regulated kinase (ERK)-dependent regulation of the activity of mechanistic target of rapamycin (mTOR) and subsequent protein synthesis has been suggested as a regulatory mechanism; however, the exact molecular processes underlying such a regulation are poorly defined. The purpose of this study was to investigate regulatory mechanisms involved in the MEK/ERK-dependent pathway leading to mTORC1 activation in skeletal muscle cells...
March 2017: FEBS Open Bio
https://www.readbyqxmd.com/read/28283797/influence-of-nrf2-activators-on-subcellular-skeletal-muscle-protein-and-dna-synthesis-rates-after-6%C3%A2-weeks-of-milk-protein-feeding-in-older-adults
#3
Adam R Konopka, Jaime L Laurin, Robert V Musci, Christopher A Wolff, Justin J Reid, Laurie M Biela, Qian Zhang, Fredrick F Peelor, Christopher L Melby, Karyn L Hamilton, Benjamin F Miller
In older adults, chronic oxidative and inflammatory stresses are associated with an impaired increase in skeletal muscle protein synthesis after acute anabolic stimuli. Conjugated linoleic acid (CLA) and Protandim have been shown to activate nuclear factor erythroid-derived 2-like 2 (Nrf2), a transcription factor for the antioxidant response element and anti-inflammatory pathways. This study tested the hypothesis that compared to a placebo control (CON), CLA and Protandim would increase skeletal muscle subcellular protein (myofibrillar, mitochondrial, cytoplasmic) and DNA synthesis in older adults after 6 weeks of milk protein feeding...
March 10, 2017: Geroscience
https://www.readbyqxmd.com/read/28280974/post-absorptive-muscle-protein-turnover-affects-resistance-training-hypertrophy
#4
Paul T Reidy, Michael S Borack, Melissa M Markofski, Jared M Dickinson, Christopher S Fry, Rachel R Deer, Elena Volpi, Blake B Rasmussen
PURPOSE: Acute bouts of resistance exercise and subsequent training alters protein turnover in skeletal muscle. The mechanisms responsible for the changes in basal post-absorptive protein turnover and its impact on muscle hypertrophy following resistance exercise training are unknown. Our goal was to determine whether post-absorptive muscle protein turnover following 12 weeks of resistance exercise training (RET) plays a role in muscle hypertrophy. In addition, we were interested in determining potential molecular mechanisms responsible for altering post-training muscle protein turnover...
March 9, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28274921/the-unfolded-protein-response-in-relation-to-mitochondrial-biogenesis-in-skeletal-muscle-cells
#5
Zahra S Mesbah Moosavi, David A Hood
Mitochondria are comprised of both nuclear- and mitochondrially-encoded proteins requiring precise stoichiometry for their integration into functional complexes. The augmented protein synthesis associated with mitochondrial biogenesis results in the accumulation of unfolded proteins, thus triggering cellular stress. As such, the unfolded protein responses emanating from the endoplasmic reticulum (UPR(ER)) or the mitochondrion (UPR(MT)) are triggered to ensure correct protein handling. Whether this response is necessary for mitochondrial adaptations is unknown...
March 8, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/28274919/%C3%AE-7%C3%AE-1-integrin-regulation-of-gene-transcription-in-skeletal-muscle-following-an-acute-bout-of-eccentric-exercise
#6
Ziad S Mahmassani, Kook Son, Yair Pincu, Michael Munroe, Jenny Drnevich, Jie Chen, Marni D Boppart
The α7β1 integrin is concentrated at the costameres of skeletal muscle and provides a critical link between the actin cytoskeleton and laminin in the basement membrane. We previously have demonstrated that expression of the α7BX2 integrin subunit (MCK:α7BX2) preserves muscle integrity and enhances myofiber cross sectional area following eccentric exercise. The purpose of this study was to utilize gene expression profiling to reveal potential mechanisms by which the α7BX2 integrin contributes to improvements in muscle growth post-exercise...
March 8, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/28273480/enhanced-protein-translation-underlies-improved-metabolic-and-physical-adaptations-to-different-exercise-training-modes-in-young-and-old-humans
#7
Matthew M Robinson, Surendra Dasari, Adam R Konopka, Matthew L Johnson, S Manjunatha, Raul Ruiz Esponda, Rickey E Carter, Ian R Lanza, K Sreekumaran Nair
The molecular transducers of benefits from different exercise modalities remain incompletely defined. Here we report that 12 weeks of high-intensity aerobic interval (HIIT), resistance (RT), and combined exercise training enhanced insulin sensitivity and lean mass, but only HIIT and combined training improved aerobic capacity and skeletal muscle mitochondrial respiration. HIIT revealed a more robust increase in gene transcripts than other exercise modalities, particularly in older adults, although little overlap with corresponding individual protein abundance was noted...
March 7, 2017: Cell Metabolism
https://www.readbyqxmd.com/read/28264543/sequential-bilateral-complete-rupture-of-the-rectus-femoris-muscle-in-a-patient-with-hereditary-spastic-paraplegia
#8
Lize Raes, Nathalie Draulans, Anja Van Campenhout, Els Ortibus, Koen Peers, Carlotte Kiekens
BACKGROUND: This case raises questions about the pathophysiology of muscle ruptures in highly functional patients with hereditary spastic paraplegia (HSP) who have only minor spasticity and no significant muscle shortening. Literature on the skeletal muscle changes secondary to spasticity or to the underlying disease, HSP, has been explored and compared with this clinical case. Two theoretical hypotheses are discussed. Firstly, chronic spasticity might be a risk factor for histopathological muscle alterations...
March 6, 2017: European Journal of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/28260185/-11-c-l-methyl-methionine-dynamic-pet-ct-of-skeletal-muscle-response-to-protein-supplementation-compared-to-l-ring-13-c6-phenylalanine-infusion-with-serial-muscle-biopsy
#9
Emily J Arentson-Lantz, Isra H Saeed, Lynda A Frassetto, Umesh Masharani, Roy J Harnish, Youngho Seo, Henry F VanBrocklin, Randall A Hawkins, Carina Mari-Aparici, Miguel H Pampaloni, James Slater, Douglas Paddon-Jones, Thomas F Lang
OBJECTIVE: The objective of this study was to determine if clinical dynamic PET/CT imaging with (11)C-L-methyl-methionine ((11)C-MET) in healthy older women can provide an estimate of tissue-level post-absorptive and post-prandial skeletal muscle protein synthesis that is consistent with the more traditional method of calculating fractional synthesis rate (FSR) of muscle protein synthesis from skeletal muscle biopsies obtained during an infusion of L-[ring (13)C6] phenylalanine ((13)C6-Phe)...
March 4, 2017: Annals of Nuclear Medicine
https://www.readbyqxmd.com/read/28257333/recent-advances-for-measurement-of-protein-synthesis-rates-use-of-the-virtual-biopsy-approach-and-measurement-of-muscle-mass
#10
Marc Hellerstein, William Evans
PURPOSE OF REVIEW: Flux-rate measurements of protein synthesis and breakdown (turnover) in muscle represent an ideal class of mechanism-based biomarkers for conditions of altered muscle mass and function. We describe here new metabolic labeling techniques for flux-rate measurements in humans, focusing on skeletal muscle. RECENT FINDINGS: Dynamics of the muscle proteome are accurately measured in humans by combining long-term heavy water labeling with tandem mass spectrometry...
March 2, 2017: Current Opinion in Clinical Nutrition and Metabolic Care
https://www.readbyqxmd.com/read/28257331/vitamin-d-and-muscle-trophicity
#11
Carla Domingues-Faria, Yves Boirie, Stéphane Walrand
PURPOSE OF REVIEW: We review recent findings on the involvement of vitamin D in skeletal muscle trophicity. RECENT FINDINGS: Vitamin D deficiencies are associated with reduced muscle mass and strength, and its supplementation seems effective to improve these parameters in vitamin D-deficient study participants. Latest investigations have also evidenced that vitamin D is essential in muscle development and repair. In particular, it modulates skeletal muscle cell proliferation and differentiation...
March 2, 2017: Current Opinion in Clinical Nutrition and Metabolic Care
https://www.readbyqxmd.com/read/28251839/urolithin-b-a-newly-identified-regulator-of-skeletal-muscle-mass
#12
Julie Rodriguez, Nicolas Pierre, Damien Naslain, Françoise Bontemps, Daneel Ferreira, Fabian Priem, Louise Deldicque, Marc Francaux
BACKGROUND: The control of muscle size is an essential feature of health. Indeed, skeletal muscle atrophy leads to reduced strength, poor quality of life, and metabolic disturbances. Consequently, strategies aiming to attenuate muscle wasting and to promote muscle growth during various (pathological) physiological states like sarcopenia, immobilization, malnutrition, or cachexia are needed to address this extensive health issue. In this study, we tested the effects of urolithin B, an ellagitannin-derived metabolite, on skeletal muscle growth...
March 1, 2017: Journal of Cachexia, Sarcopenia and Muscle
https://www.readbyqxmd.com/read/28237723/androgen-mediated-regulation-of-skeletal-muscle-protein-balance
#13
REVIEW
Michael L Rossetti, Jennifer L Steiner, Bradley S Gordon
Androgens significantly alter muscle mass in part by shifting protein balance in favor of net protein accretion. During various atrophic conditions, the clinical impact of decreased production or bioavailability of androgens (termed hypogonadism) is important as a loss of muscle mass is intimately linked with survival outcome. While androgen replacement therapy increases muscle mass in part by restoring protein balance, this is not a comprehensive treatment option due to potential side effects. Therefore, an understanding of the mechanisms by which androgens alter protein balance is needed for the development of androgen-independent therapies...
February 22, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28228415/reduced-skeletal-muscle-fiber-size-following-caloric-restriction-is-associated-with-calpain-mediated-proteolysis-and-attenuation-of-igf-1-signaling
#14
Yue Lu, Jennifer S Bradley, Sarah R McCoski, John M Gonzalez, Alan D Ealy, Sally E Johnson
Caloric restriction decreases skeletal muscle mass in mammals, principally due to a reduction in fiber size. The effect of suboptimal nutrient intake on skeletal muscle metabolic properties in neonatal calves was examined. The longissimus muscle (LM) was collected after 8 wks consuming a control (CON) or caloric restricted (CR) diet and muscle fiber size, gene expression and metabolic signal transduction activity was measured. Results revealed that CR animals had smaller (P < 0.05) LM fiber cross-sectional area than CON, as expected...
February 22, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28210805/transcutaneous-carbon-dioxide-application-accelerates-muscle-injury-repair-in-rat-models
#15
Shiho Akahane, Yoshitada Sakai, Takeshi Ueha, Hanako Nishimoto, Miho Inoue, Takahiro Niikura, Ryosuke Kuroda
PURPOSE: Skeletal muscle injuries are commonly observed in sports and traumatology medicine. Previously, we demonstrated that transcutaneous application of carbon dioxide (CO2) to lower limbs increased the number of muscle mitochondria and promoted muscle endurance. Therefore, we aimed to investigate whether transcutaneous CO2 application could enhance recovery from muscle injury. METHODS: Tibialis anterior muscle damage was induced in 27 Sprague Dawley rats via intramuscular injection of bupivacaine...
February 16, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28186492/requirement-of-myomaker-mediated-stem-cell-fusion-for-skeletal-muscle-hypertrophy
#16
Qingnian Goh, Douglas P Millay
Fusion of skeletal muscle stem/progenitor cells is required for proper development and regeneration, however the significance of this process during adult muscle hypertrophy has not been explored. In response to muscle overload after synergist ablation in mice, we show that myomaker, a muscle specific membrane protein essential for myoblast fusion, is activated mainly in muscle progenitors and not myofibers. We rendered muscle progenitors fusion-incompetent through genetic deletion of myomaker in muscle stem cells and observed a complete reduction of overload-induced hypertrophy...
February 10, 2017: ELife
https://www.readbyqxmd.com/read/28183860/diminished-satellite-cell-fusion-and-s6k1-expression-in-myotubes-derived-from-skeletal-muscle-of-low-birth-weight-neonatal-pigs
#17
Ying Chen, Haibo Zhu, Sydney R McCauley, Lidan Zhao, Sally E Johnson, Robert P Rhoads, Samer W El-Kadi
Low birth weight (LBWT) is consistently associated with impaired postnatal muscle growth in mammals. Satellite cell (SC)-mediated myonuclear incorporation precedes protein accumulation in the early stages of postnatal muscle development and growth. The objective of this study was to investigate proliferation and differentiation of SCs and the regulation of protein synthesis signaling in response to insulin-like growth factor (IGF)-I stimulation in SC-derived myotubes of LBWT neonatal pigs. SCs isolated from Longissimus dorsi muscle of LBWT and NBWT pigs (3-d-old, n = 8) were cultured and induced to proliferate and differentiate to myotubes in vitro...
February 2017: Physiological Reports
https://www.readbyqxmd.com/read/28177708/the-effect-of-caffeine-on-skeletal-muscle-anabolic-signaling-and-hypertrophy
#18
Timothy M Moore, Xavier M Mortensen, Conrad K Ashby, Alexander M Harris, Karson J Kump, David W Laird, Aaron J Adams, Jeremy K Bray, Ting Chen, David M Thomson
Caffeine is a widely-consumed stimulant with the potential to enhance physical performance through multiple mechanisms. However, recent in vitro findings have suggested that caffeine may block skeletal muscle anabolic signaling through AMP-activated protein kinase (AMPK)-mediated inhibition of mechanistic target of rapamycin (mTOR) signaling pathway. This could negatively affect protein synthesis and the capacity for muscle growth. The primary purpose of this study was to assess the effect of caffeine on in vivo AMPK and mTOR pathway signaling, protein synthesis and muscle growth...
January 26, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28177127/emerging-roles-of-er-stress-and-unfolded-protein-response-pathways-in-skeletal-muscle-health-and-disease
#19
REVIEW
Kyle R Bohnert, Joseph D McMillan, Ashok Kumar
Skeletal muscle is the most abundant tissue in the human body and can adapt its mass as a consequence of physical activity, metabolism, growth factors, and disease conditions. Skeletal muscle contains an extensive network of endoplasmic reticulum (ER), called sarcoplasmic reticulum, which plays an important role in the regulation of proteostasis and calcium homeostasis. In many cell types, environmental and genetic factors that disrupt ER function cause an accumulation of misfolded and unfolded proteins in the ER lumen that ultimately leads to ER stress...
February 8, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28122601/inhibition-of-stat3-signaling-ameliorates-atrophy-of-the-soleus-muscles-in-mice-lacking-the-vitamin-d-receptor
#20
Suchitra D Gopinath
BACKGROUND: Although skeletal muscle wasting has long been observed as a clinical outcome of impaired vitamin D signaling, precise molecular mechanisms that mediate the loss of muscle mass in the absence of vitamin D signaling are less clear. To determine the molecular consequences of vitamin D signaling, we analyzed the role of signal transducer and activator of transcription 3 (Stat3) signaling, a known contributor to various muscle wasting pathologies, in skeletal muscles. METHODS: We isolated soleus (slow) and tibialis anterior (fast) muscles from mice lacking the vitamin D receptor (VDR(-/-)) and used western blot analysis, quantitative RTPCR, and pharmacological intervention to analyze muscle atrophy in VDR(-/-) mice...
January 25, 2017: Skeletal Muscle
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