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muscle protein breakdown

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https://www.readbyqxmd.com/read/27906079/muscle-specific-loss-of-bmal1-leads-to-disrupted-tissue-glucose-metabolism-and-systemic-glucose-homeostasis
#1
Brianna D Harfmann, Elizabeth A Schroder, Maureen T Kachman, Brian A Hodge, Xiping Zhang, Karyn A Esser
BACKGROUND: Diabetes is the seventh leading cause of death in the USA, and disruption of circadian rhythms is gaining recognition as a contributing factor to disease prevalence. This disease is characterized by hyperglycemia and glucose intolerance and symptoms caused by failure to produce and/or respond to insulin. The skeletal muscle is a key insulin-sensitive metabolic tissue, taking up ~80 % of postprandial glucose. To address the role of the skeletal muscle molecular clock to insulin sensitivity and glucose tolerance, we generated an inducible skeletal muscle-specific Bmal1 (-/-) mouse (iMSBmal1 (-/-))...
March 30, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27906069/the-beneficial-role-of-proteolysis-in-skeletal-muscle-growth-and-stress-adaptation
#2
REVIEW
Ryan A V Bell, Mohammad Al-Khalaf, Lynn A Megeney
Muscle atrophy derived from excessive proteolysis is a hallmark of numerous disease conditions. Accordingly, the negative consequences of skeletal muscle protein breakdown often overshadow the critical nature of proteolytic systems in maintaining normal cellular function. Here, we discuss the major cellular proteolysis machinery-the ubiquitin/proteosome system, the autophagy/lysosomal system, and caspase-mediated protein cleavage-and the critical role of these protein machines in establishing and preserving muscle health...
April 6, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27875290/whole-body-protein-turnover-and-net-protein-balance-after-pediatric-thoracic-surgery-a-noninvasive-single-dose-15n-glycine-stable-isotope-protocol-with-end-product-enrichment
#3
Brenna S Fullerton, Eric A Sparks, Faraz A Khan, Jeremy G Fisher, Rocco Anzaldi, Michael R Scoville, Yong-Ming Yu, David A Wagner, Tom Jaksic, Nilesh M Mehta
BACKGROUND: We used the (15)N glycine urinary end-product enrichment technique to quantify whole body protein turnover following thoracic surgery. MATERIALS AND METHODS: A single dose of (15)N glycine (2 mg/kg) was administered orally on postoperative day 1 to children (1-18 years) following thoracic surgery. (15)N enrichment of ammonia and urea was measured in mixed urine after 12 and 24 hours, respectively, and protein synthesis, breakdown, and net balance determined...
November 15, 2016: JPEN. Journal of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/27810289/gray-meat-in-the-atlantic-sea-scallop-placopecten-magellanicus-and-the-identification-of-a-known-pathogenic-scallop-apicomplexan
#4
Susan D Inglis, Árni Kristmundsson, Mark A Freeman, Megan Levesque, Kevin Stokesbury
Atlantic sea scallop (Placopecten magellanicus) meats are normally firm and creamy white. However, scallops with small, darkened and stringy adductor muscle (gray meat) episodically occur along the Eastern Seaboard, most recently in the rotational management areas of Georges Bank after extended fishing closures. These gray meat scallops are associated with reduced harvestable biomass and mass mortality events. We tested age, nutritional stress and disease as causative agents for this condition. Adult scallops of different shell heights (SH) ranging from (90-145mm) were collected from Georges Bank and analyzed for meat quality and the presence of pathogens using biochemical, histopathological and molecular methods...
November 2016: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/27807712/the-role-of-extracellular-matrix-components-in-pin-bone-attachments-during-storage-a-comparison-between-farmed-atlantic-salmon-salmo-salar-and-cod-gadus-morhua-l
#5
Sissel B Rønning, Tone-Kari Østbye, Aleksei Krasnov, Tram T Vuong, Eva Veiseth-Kent, Svein O Kolset, Mona E Pedersen
Pin bones represent a major problem for processing and quality of fish products. Development of methods of removal requires better knowledge of the pin bones' attachment to the muscle and structures involved in the breakdown during loosening. In this study, pin bones from cod and salmon were dissected from fish fillets after slaughter or storage on ice for 5 days, and thereafter analysed with molecular methods, which revealed major differences between these species before and after storage. The connective tissue (CT) attaches the pin bone to the muscle in cod, while the pin bones in salmon are embedded in adipose tissue...
November 2, 2016: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/27798330/soy-dairy-protein-blend-or-whey-protein-isolate-ingestion-induces-similar-postexercise-muscle-mechanistic-target-of-rapamycin-complex-1-signaling-and-protein-synthesis-responses-in-older-men
#6
Michael S Borack, Paul T Reidy, Syed H Husaini, Melissa M Markofski, Rachel R Deer, Abigail B Richison, Bradley S Lambert, Mark B Cope, Ratna Mukherjea, Kristofer Jennings, Elena Volpi, Blake B Rasmussen
BACKGROUND: Previous work demonstrated that a soy-dairy protein blend (PB) prolongs hyperaminoacidemia and muscle protein synthesis in young adults after resistance exercise. OBJECTIVE: We investigated the effect of PB in older adults. We hypothesized that PB would prolong hyperaminoacidemia, enhancing mechanistic target of rapamycin complex 1 (mTORC1) signaling and muscle protein anabolism compared with a whey protein isolate (WPI). METHODS: This double-blind, randomized controlled trial studied men 55-75 y of age...
October 26, 2016: Journal of Nutrition
https://www.readbyqxmd.com/read/27767211/foxo-dependent-atrogenes-vary-among-catabolic-conditions-and-play-a-key-role-in-muscle-atrophy-induced-by-hindlimb-suspension
#7
Lorenza Brocca, Luana Toniolo, Carlo Reggiani, Roberto Bottinelli, Marco Sandri, Maria Antonietta Pellegrino
Muscle atrophy is a complex process that is in common with many different catabolic diseases including disuse/inactivity and ageing. The signalling pathways that control the atrophy program in the different disuse/inactivity conditions have not yet been completely dissected. It has been recently reported that inhibition of FoxO only partially spared muscle mass after denervation. The purposes of this study were: (i) to determine the involvement of FoxOs in hindlimb suspension disuse model, (ii) to define whether the molecular events of protein breakdown are shared among different unloaded muscles and finally (iii) to compare the data obtained in this model with another model of inactivity such as denervation...
October 21, 2016: Journal of Physiology
https://www.readbyqxmd.com/read/27765842/adrenodemedullation-activates-the-ca2-dependent-proteolysis-in-soleus-muscles-from-rats-exposed-to-cold
#8
Leandro H Manfredi, D Lustrino, Juliano Machado, Wilian Assis Silveira, Neusa Maria Zanon, Luiz C Navegantes, Isis do Carmo Kettelhut
Previous studies have shown that catecholamines in vivo and in vitro inhibit the activity of Ca(2+)-dependent proteolysis in skeletal muscles under basal conditions. In the present study we sought to investigate the role of catecholamines in regulating the Ca(2+)-dependent proteolysis in soleus and extensor digitorum longus (EDL) muscles from rats acutely exposed to cold. Overall proteolysis, the activity of proteolytic systems as well as protein levels and gene expression of different components of calpain system were investigated in rats submitted to adrenodemedullation (ADMX) and exposed to cold for 24 h...
October 20, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27756842/an-intronic-enhancer-element-regulates-angiotensin-ii-type-2-receptor-expression-during-satellite-cell-differentiation-and-its-activity-is-suppressed-in-congestive-heart-failure
#9
Tadashi Yoshida, Patrice Delafontaine
Patients with advanced congestive heart failure (CHF) or chronic kidney disease often have increased angiotensin II (Ang II) levels and cachexia. We previously demonstrated that Ang II, via its type 1 receptor, causes muscle protein breakdown and apoptosis and inhibits satellite cell (SC) proliferation and muscle regeneration, likely contributing to cachexia in CHF and chronic kidney disease. In contrast, Ang II, via its type 2 receptor (AT2R) expression, is robustly induced during SC differentiation, and it potentiates muscle regeneration...
December 2, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27749759/restorative-mechanisms-regulating-protein-balance-in-skeletal-muscle-during-recovery-from-sepsis
#10
Kristen T Crowell, David I Soybel, Charles H Lang
Muscle deconditioning is commonly observed in patients surviving sepsis. Little is known regarding the molecular mechanisms regulating muscle protein homeostasis during the recovery or convalescence phase. We adapted a sepsis-recovery mouse model that uses cecal ligation and puncture (CLP), followed 24 h later by cecal resection and antibiotic treatment, to identify putative cellular pathways regulating protein synthesis and breakdown in skeletal muscle. Ten days after CLP, body weight and food consumption did not differ between control and sepsis-recovery mice, but gastrocnemius weight was reduced...
October 5, 2016: Shock
https://www.readbyqxmd.com/read/27738123/the-effect-of-four-different-feeding-regimens-from-rearing-period-to-sexual-maturity-on-breast-muscle-protein-turnover-in-broiler-breeder-parent-stock
#11
Karen Vignale, Justina V Caldas, Judy A England, Nirun Boonsinchai, Phiphob Sodsee, Monticha Putsakum, Erik D Pollock, Sami Dridi, Craig N Coon
A study was conducted to evaluate the effect of four different feeding regimens on breast muscle protein turnover in broiler breeder Cobb-500 parent stock (PS) pullets and breeder hens. The four feeding regimens based on BW curves utilized for the study were as follows: Everyday feeding (STD-ED) (Cobb Standard BW curve), skip-a-day feeding (STD-SKIP) (Cobb Standard BW curve), lighter BW (LBW-SKIP) (BW curve 20% under), and heavier BW (HBW-SKIP) (BW curve 20% over). Each feeding regimen was provided to pullets from 4 wk to 21 wk of age...
October 12, 2016: Poultry Science
https://www.readbyqxmd.com/read/27734117/igf-1-prevents-simvastatin-induced-myotoxicity-in-c2c12-myotubes
#12
Annalisa Bonifacio, Gerda M Sanvee, Karin Brecht, Denise V Kratschmar, Alex Odermatt, Jamal Bouitbir, Stephan Krähenbühl
Statins are generally well tolerated, but treatment with these drugs may be associated with myopathy. The mechanisms of statin-associated myopathy are not completely understood. Statins inhibit AKT phosphorylation by an unclear mechanism, whereas insulin-like growth factor (IGF-1) activates the IGF-1/AKT signaling pathway and promotes muscle growth. The aims of the study were to investigate mechanisms of impaired AKT phosphorylation by simvastatin and to assess effects of IGF-1 on simvastatin-induced myotoxicity in C2C12 myotubes...
October 12, 2016: Archives of Toxicology
https://www.readbyqxmd.com/read/27708684/the-impact-of-protein-quality-on-the-promotion-of-resistance-exercise-induced-changes-in-muscle-mass
#13
REVIEW
Stuart M Phillips
Protein supplementation during resistance exercise training augments hypertrophic gains. Protein ingestion and the resultant hyperaminoacidemia provides the building blocks (indispensable amino acids - IAA) for, and also triggers an increase in, muscle protein synthesis (MPS), suppression of muscle protein breakdown (MPB), and net positive protein balance (i.e., MPS > MPB). The key amino acid triggering the rise in MPS is leucine, which stimulates the mechanistic target of rapamycin complex-1, a key signalling protein, and triggers a rise in MPS...
2016: Nutrition & Metabolism
https://www.readbyqxmd.com/read/27707689/caveolin-3-plays-a-critical-role-in-autophagy-after-ischemia-reperfusion
#14
Adam Kassan, Uyen Pham, Quynhmy Nguyen, Melissa E Reichelt, Eunbyul Cho, Piyush M Patel, David M Roth, Brian P Head, Hemal H Patel
Autophagy is a dynamic recycling process responsible for the breakdown of misfolded proteins and damaged organelles, providing nutrients and energy for cellular renovation and homeostasis. Loss of autophagy is associated with cardiovascular diseases. Caveolin-3 (Cav-3), a muscle-specific isoform, is a structural protein within caveolae and is critical to stress adaptation in the heart. Whether Cav-3 plays a role in regulating autophagy to modulate cardiac stress responses remains unknown. In the present study, we used HL-1 cells, a cardiac muscle cell line, with stable Cav-3 knockdown (Cav-3 KD) and Cav-3 overexpression (Cav-3 OE) to study the impact of Cav-3 in regulation of autophagy...
December 1, 2016: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/27689017/osteocalcin-is-necessary-and-sufficient-to-maintain-muscle-mass-in-older-mice
#15
Paula Mera, Kathrin Laue, Jianwen Wei, Julian Meyer Berger, Gerard Karsenty
OBJECTIVE: A decrease in muscle protein turnover and therefore in muscle mass is a hallmark of aging. Because the circulating levels of the bone-derived hormone osteocalcin decline steeply during aging in mice, monkeys and humans we asked here whether this hormone might regulate muscle mass as mice age. METHODS: We examined muscle mass and strength in mice lacking osteocalcin (Ocn-/-) or its receptor in all cells (Gprc6a-/-) or specifically in myofibers (Gprc6a Mck -/-) as well as in 9 month-old WT mice receiving exogenous osteocalcin for 28 days...
October 2016: Molecular Metabolism
https://www.readbyqxmd.com/read/27677502/protein-coingestion-with-alcohol-following-strenuous-exercise-attenuates-alcohol-induced-intramyocellular-apoptosis-and-inhibition-of-autophagy
#16
William J Smiles, Evelyn B Parr, Vernon G Coffey, Orly Lacham-Kaplan, John A Hawley, Donny M Camera
Alcohol ingestion decreases post-exercise rates of muscle protein synthesis, but the mechanism(s) (e.g., increased protein breakdown) underlying this observation are unknown. Autophagy is an intracellular "recycling" system required for homeostatic substrate and organelle turnover; its dysregulation may provoke apoptosis and lead to muscle atrophy. We investigated the acute effects of alcohol ingestion on autophagic cell signaling responses to a bout of concurrent (combined resistance- and endurance-based) exercise...
September 27, 2016: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/27665016/effect-of-white-striping-myopathy-on-breast-muscle-pectoralis-major-protein-turnover-and-gene-expression-in-broilers
#17
Karen Vignale, Justina V Caldas, Judy A England, Nirun Boonsinchai, Andrew Magnuson, Erik D Pollock, Sami Dridi, Casey M Owens, Craig N Coon
A study was conducted to evaluate the effect of white striping ( WS: ) of broiler breast muscle (Pectoralis major) on protein turnover and gene expression of genes related to protein degradation and fatty acid synthesis. A total of 560 day-old male broiler chicks Cobb 500 were allocated in a total of 16 pens, 35 chicks per pen. A completely randomized design was conducted with a 2 × 3 factorial arrangement (2 scores: severe and normal, and 3 breast meat samples sites). At d 60, 20 birds were randomly selected, euthanized, and scored for white striping...
September 24, 2016: Poultry Science
https://www.readbyqxmd.com/read/27625792/reversal-of-intramyocellular-lipid-accumulation-by-lipophagy-and-a-p62-mediated-pathway
#18
T Lam, R Harmancey, H Vasquez, B Gilbert, N Patel, V Hariharan, A Lee, M Covey, H Taegtmeyer
We have previously observed the reversal of lipid droplet deposition in skeletal muscle of morbidly obese patients following bariatric surgery. We now investigated whether activation of autophagy is the mechanism underlying this observation. For this purpose, we incubated rat L6 myocytes over a period of 6 days with long-chain fatty acids (an equimolar, 1.0 mM, mixture of oleate and palmitate in the incubation medium). At day 6, the autophagic inhibitor (bafilomycin A1, 200 nM) and the autophagic activator (rapamycin, 1 μM) were added separately or in combination for 48 h...
2016: Cell Death Discovery
https://www.readbyqxmd.com/read/27610086/human-skeletal-muscle-disuse-atrophy-effects-on-muscle-protein-synthesis-breakdown-and-insulin-resistance-a-qualitative-review
#19
REVIEW
Supreeth S Rudrappa, Daniel J Wilkinson, Paul L Greenhaff, Kenneth Smith, Iskandar Idris, Philip J Atherton
The ever increasing burden of an aging population and pandemic of metabolic syndrome worldwide demands further understanding of the modifiable risk factors in reducing disability and morbidity associated with these conditions. Disuse skeletal muscle atrophy (sometimes referred to as "simple" atrophy) and insulin resistance are "non-pathological" events resulting from sedentary behavior and periods of enforced immobilization e.g., due to fractures or elective orthopedic surgery. Yet, the processes and drivers regulating disuse atrophy and insulin resistance and the associated molecular events remain unclear-especially in humans...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27586837/the-impact-of-post-exercise-essential-amino-acid-ingestion-on-the-ubiquitin-proteasome-and-autophagosomal-lysosomal-systems-in-skeletal-muscle-of-older-men
#20
Jared M Dickinson, Paul T Reidy, David M Gundermann, Michael S Borack, Dillon K Walker, Andrew C D'Lugos, Elena Volpi, Blake B Rasmussen
Essential amino acid (EAA) ingestion enhances postexercise muscle protein synthesis, and in particular, the anabolic response of older adults appears sensitive to the quantity of ingested leucine. The effect of leucine ingestion on muscle breakdown following resistance exercise (RE) is less understood. The purpose of this study was to identify the impact of postexercise leucine ingestion on the ubiquitin proteasome and autophagosomal-lysosomal systems following acute RE in older men. Subjects (72±2yr) performed RE and 1h postexercise ingested 10g of EAA containing a leucine quantity similar to quality protein (Control, 1...
September 1, 2016: Journal of Applied Physiology
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