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Skeletal muscle hypertrophy

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https://www.readbyqxmd.com/read/28344752/involvement-of-cbl-b-mediated-macrophage-inactivation-in-insulin-resistance
#1
REVIEW
Tomoki Abe, Katsuya Hirasaka, Takeshi Nikawa
Aging and overnutrition cause obesity in rodents and humans. It is well-known that obesity causes various diseases by producing insulin resistance (IR). Macrophages infiltrate the adipose tissue (AT) of obese individuals and cause chronic low-level inflammation associated with IR. Macrophage infiltration is regulated by the chemokines that are released from hypertrophied adipocytes and the immune cells in AT. Saturated fatty acids are recognized by toll-like receptor 4 (TLR4) and induce inflammatory responses in AT macrophages (ATMs)...
March 15, 2017: World Journal of Diabetes
https://www.readbyqxmd.com/read/28341051/whey-protein-derived-exosomes-increase-protein-synthesis-and-hypertrophy-in-c2-c12-myotubes
#2
C Brooks Mobley, Petey W Mumford, John J McCarthy, Michael E Miller, Kaelin C Young, Jeffrey S Martin, Darren T Beck, Christopher M Lockwood, Michael D Roberts
We sought to examine potential amino acid independent mechanisms whereby hydrolyzed whey protein (WP) affects muscle protein synthesis (MPS) and anabolism in vitro. Specifically, we tested (1) whether 3-h and 6-h treatments of WP, essential amino acids, or l-leucine (Leu) affected MPS, and whether 6-h treatments with low-, medium-, or high doses of WP versus Leu affected MPS; (2) whether knockdown of the primary Leu transporter affected WP- and Leu-mediated changes in MPS, mammalian target of rapamycin (mTOR) signaling responses, or both, following 6-h treatments; (3) whether exosomes isolated from WP (WP-EXO) affected MPS, mTOR signaling responses, or both, compared with untreated (control) myotubes, following 6-h, 12-h, and 24-h treatments, and whether they affected myotube diameter following 24-h and 48-h treatments...
January 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28325641/spectrum-of-nondystrophic-skeletal-muscle-channelopathies-in-children
#3
Fouad Al-Ghamdi, Basil T Darras, Partha S Ghosh
BACKGROUND: The nondystrophic skeletal muscle channelopathies are a group of disorders caused by mutations of various voltage-gated ion channel genes, including nondystrophic myotonia and periodic paralysis. METHODS: We identified patients with a diagnosis of muscle channelopathy from our neuromuscular database in a tertiary care pediatric center from 2005 to 2015. We then performed a retrospective review of their medical records for demographic characteristics, clinical features, investigations, treatment, and follow-up...
February 16, 2017: Pediatric Neurology
https://www.readbyqxmd.com/read/28321637/the-time-course-of-short-term-hypertrophy-in-the-absence-of-eccentric-muscle-damage
#4
Matt S Stock, Jacob A Mota, Ryan N DeFranco, Katherine A Grue, A Unique Jacobo, Eunhee Chung, Jordan R Moon, Jason M DeFreitas, Travis W Beck
BACKGROUND: It has been proposed that the increase in skeletal muscle mass observed during the initial weeks of initiating a resistance training program is concomitant with eccentric muscle damage and edema. PURPOSE: We examined the time course of muscle hypertrophy during 4 weeks of concentric-only resistance training. METHODS: Thirteen untrained men performed unilateral concentric-only dumbbell curls and shoulder presses twice per week for 4 weeks...
March 20, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28316854/a-marked-response-to-immunosuppressive-intervention-for-abruptly-occurring-cardiac-complications-in-a-case-of-juvenile-systemic-sclerosis-overlapped-with-dermatomyositis
#5
Tsunehisa Nagamori, Yoichiro Yoshida, Hironori Takahashi, Hideharu Oka, Aya Kajihama, Koichi Nakau, Masaya Sugimoto, Masako Minami-Hori, Hiroshi Azuma
Juvenile-onset systemic sclerosis (jSSc) is a rare condition, having unique characteristic features compared to adult-onset SSc. Although cardiac involvement (CI) is known as a leading cause of mortality overall in SSc, the importance of CI in jSSc has not been emphasized. Here we present a 13-year-old female with jSSc overlapped with dermatomyositis (DM) complicated CI. She developed skin thickness and induration, Raynaud's phenomenon, digital pitting scars in fingertips, and skeletal myositis. Oral prednisolone and pulse methotrexate treatment led to the improvement of skin findings; however two weeks after the initiation she suddenly presented with muscle pain and dyspnea within a few days...
2017: Case Reports in Pediatrics
https://www.readbyqxmd.com/read/28316572/eccentric-ergometer-training-promotes-locomotor-muscle-strength-but-not-mitochondrial-adaptation-in-patients-with-severe-chronic-obstructive-pulmonary-disease
#6
Norah J MacMillan, Sophia Kapchinsky, Yana Konokhova, Gilles Gouspillou, Riany de Sousa Sena, R Thomas Jagoe, Jacinthe Baril, Tamara E Carver, Ross E Andersen, Ruddy Richard, Hélène Perrault, Jean Bourbeau, Russell T Hepple, Tanja Taivassalo
Eccentric ergometer training (EET) is increasingly being proposed as a therapeutic strategy to improve skeletal muscle strength in various cardiorespiratory diseases, due to the principle that lengthening muscle actions lead to high force-generating capacity at low cardiopulmonary load. One clinical population that may particularly benefit from this strategy is chronic obstructive pulmonary disease (COPD), as ventilatory constraints and locomotor muscle dysfunction often limit efficacy of conventional exercise rehabilitation in patients with severe disease...
2017: Frontiers in Physiology
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
#7
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/28287512/preparation-and-culture-of-myogenic-precursor-cells-primary-myoblasts-from-skeletal-muscle-of-adult-and-aged-humans
#8
Ana Soriano-Arroquia, Peter D Clegg, Andrew P Molloy, Katarzyna Goljanek-Whysall
Skeletal muscle homeostasis depends on muscle growth (hypertrophy), atrophy and regeneration. During ageing and in several diseases, muscle wasting occurs. Loss of muscle mass and function is associated with muscle fiber type atrophy, fiber type switching, defective muscle regeneration associated with dysfunction of satellite cells, muscle stem cells, and other pathophysiological processes. These changes are associated with changes in intracellular as well as local and systemic niches. In addition to most commonly used rodent models of muscle ageing, there is a need to study muscle homeostasis and wasting using human models, which due to ethical implications, consist predominantly of in vitro cultures...
February 16, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28286738/tsc2-rheb-signaling-mediates-erk-dependent-regulation-of-mtorc1-activity-in-c2c12-myoblasts
#9
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/28281528/lnc-mg-is-a-long-non-coding-rna-that-promotes-myogenesis
#10
Mu Zhu, Jiafan Liu, Jia Xiao, Li Yang, Mingxiang Cai, Hongyu Shen, Xiaojia Chen, Yi Ma, Sumin Hu, Zuolin Wang, An Hong, Yingxian Li, Yao Sun, Xiaogang Wang
Recent studies indicate important roles for long noncoding RNAs (lncRNAs) as essential regulators of myogenesis and adult skeletal muscle regeneration. However, the specific roles of lncRNAs in myogenic differentiation of adult skeletal muscle stem cells and myogenesis are still largely unknown. Here we identify a lncRNA that is specifically enriched in skeletal muscle (myogenesis-associated lncRNA, in short, lnc-mg). In mice, conditional knockout of lnc-mg in skeletal muscle results in muscle atrophy and the loss of muscular endurance during exercise...
March 10, 2017: Nature Communications
https://www.readbyqxmd.com/read/28280974/post-absorptive-muscle-protein-turnover-affects-resistance-training-hypertrophy
#11
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/28278204/sarcolipin-deletion-exacerbates-soleus-muscle-atrophy-and-weakness-in-phospholamban-overexpressing-mice
#12
Val A Fajardo, Daniel Gamu, Andrew Mitchell, Darin Bloemberg, Eric Bombardier, Paige J Chambers, Catherine Bellissimo, Joe Quadrilatero, A Russell Tupling
Sarcolipin (SLN) and phospholamban (PLN) are two small proteins that regulate the sarco(endo)plasmic reticulum Ca2+-ATPase pumps. In a recent study, we discovered that Pln overexpression (PlnOE) in slow-twitch type I skeletal muscle fibers drastically impaired SERCA function and caused a centronuclear myopathy-like phenotype, severe muscle atrophy and weakness, and an 8 to 9-fold upregulation of SLN protein in the soleus muscles. Here, we sought to determine the physiological role of SLN upregulation, and based on its role as a SERCA inhibitor, we hypothesized that it would represent a maladaptive response that contributes to the SERCA dysfunction and the overall myopathy observed in the PlnOE mice...
2017: PloS One
https://www.readbyqxmd.com/read/28277477/partial-glossectomy-as-an-adjunctive-method-to-ortho-surgical-treatment
#13
Ney Robson Bezerra Ribeiro, Leonardo de Freitas Silva, Heitor Fontes da Silva, Erik Neiva Ribeiro de Carvalho Reis, Jair Queiroz de Oliveira Neto, Raimundo Nonato Maia, Manuel de Jesus Rodrigues Mello
The macroglossia is a rare condition, congenital or acquired, characterized by hypertrophy of the lingual muscles that can cause both aesthetic and functional changes such as mandibular prognathism and malocclusion. Diagnosis is through clinical examination. Treatment consists of excision of part of the tongue and different surgical techniques have been described in the literature. The keyhole lingual resection technique has shown satisfactory results in reducing the volume and preservation of the neurovascular bundles of the tongue...
March 8, 2017: Journal of Craniofacial Surgery
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
#14
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/28251839/urolithin-b-a-newly-identified-regulator-of-skeletal-muscle-mass
#15
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/28251652/sirt1-may-play-a-crucial-role-in-overload-induced-hypertrophy-of-skeletal-muscle
#16
Erika Koltai, Zoltán Bori, Clovis Chabert, Hervé Dubouchaud, Hisashi Naito, Shuichi Machida, Kelvin Ja Davies, Zsolt Murlasits, Andrew C Fry, Istvan Boldogh, Zsolt Radak
Significant skeletal muscle mass guarantees functional wellbeing and is important for high level performance in many sports. Although the molecular mechanism for skeletal muscle hypertrophy has been well-studied, it still is not completely understood. In the present study, we used a functional overload model to induce plantaris muscle hypertrophy by surgically removing the soleus, and gastrocnemius muscles in rats. Two weeks of muscle ablation resulted in a 40% increase in muscle mass, which was associated with a significant increase in SIRT1 content and activity (P < 0...
March 2, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28246113/disseminated-cysticercosis-incidentally-diagnosed-in-a-patient-of-fracture-shaft-of-femur
#17
Noora Saeed, Aaliya Ehsan, Shaista M Vasenwala
Cysticercosis is caused by the larval form of Taenia solium tape worm, cysticercus cellulose. The life cycle of T. solium consists of 2 host, the definite host is a man who harbours the adult forms of the worm in the intestine, while the intermediate host is the pig, where the larval form (cysticercus cellulose) is found in the skeletal muscle. Cysticercosis develops when human beings incidentally become the intermediate host and the eggs mature within their small intestine. The route of entry of the eggs into the human intestine may occur through autoinfection or by ingestion of contaminated food or water...
February 28, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28209382/err%C3%AE-a-junior-orphan-with-a-senior-role-in-metabolism
#18
REVIEW
Jagannath Misra, Don-Kyu Kim, Hueng-Sik Choi
Estrogen-related receptor (ERR)γ is an orphan nuclear hormone receptor that belongs to the ERR subfamily of transcription factors. No endogenous ligand has been identified to date. ERRγ possesses ligand-independent transcriptional activity that is regulated by co-regulator interactions, and post-translational modifications (PTMs). Recent data from animal models have established ERRγ as a crucial mediator of multiple endocrine and metabolic signals. ERRγ plays important roles in pathological conditions such as insulin resistance, alcoholic liver injury, and cardiac hypertrophy, and controls energy metabolism in the heart, skeletal muscle, and pancreatic β cells...
February 13, 2017: Trends in Endocrinology and Metabolism: TEM
https://www.readbyqxmd.com/read/28209124/rna-seq-and-metabolomic-analyses-of-akt1-mediated-muscle-growth-reveals-regulation-of-regenerative-pathways-and-changes-in-the-muscle-secretome
#19
Chia-Ling Wu, Yoshinori Satomi, Kenneth Walsh
BACKGROUND: Skeletal muscle is a major regulator of systemic metabolism as it serves as the major site for glucose disposal and the main reservoir for amino acids. With aging, cachexia, starvation, and myositis, there is a preferential loss of fast glycolytic muscle fibers. We previously reported a mouse model in which a constitutively-active Akt transgene is induced to express in a subset of muscle groups leading to the hypertrophy of type IIb myofibers with an accompanying increase in strength...
February 16, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28186492/requirement-of-myomaker-mediated-stem-cell-fusion-for-skeletal-muscle-hypertrophy
#20
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
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