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Muscle catabolism

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https://www.readbyqxmd.com/read/28428966/nutrition-and-metabolism-in-burn-patients
#1
REVIEW
Audra Clark, Jonathan Imran, Tarik Madni, Steven E Wolf
Severe burn causes significant metabolic derangements that make nutritional support uniquely important and challenging for burned patients. Burn injury causes a persistent and prolonged hypermetabolic state and increased catabolism that results in increased muscle wasting and cachexia. Metabolic rates of burn patients can surpass twice normal, and failure to fulfill these energy requirements causes impaired wound healing, organ dysfunction, and susceptibility to infection. Adequate assessment and provision of nutritional needs is imperative to care for these patients...
2017: Burns and trauma
https://www.readbyqxmd.com/read/28428077/molecular-bases-of-the-crosstalk-between-bone-and-muscle
#2
Gerard Karsenty, Paula Mera
Exercise is an evolutionary conserved survival function that nowadays has beneficial health effects. The increased metabolic activity of contracting skeletal muscle affects the biology of many organs involved in regulating muscle functions. The discovery of hormones and cytokines secreted by bone and skeletal muscle during exercise, has recently added experimental credence to the notion that a crosstalk exists between these organs. Bone through the hormone osteocalcin, promotes exercise capacity in the mouse...
April 17, 2017: Bone
https://www.readbyqxmd.com/read/28424626/a-rat-immobilization-model-based-on-cage-volume-reduction-a-physiological-model-for-bed-rest
#3
Enrica Marmonti, Sílvia Busquets, Míriam Toledo, Marina Ricci, Marc Beltrà, Victòria Gudiño, Francesc Oliva, José M López-Pedrosa, Manuel Manzano, Ricardo Rueda, Francisco J López-Soriano, Josep M Argilés
Bed rest has been an established treatment in the past prescribed for critically illness or convalescing patients, in order to preserve their body metabolic resource, to prevent serious complications and to support their rapid path to recovery. However, it has been reported that prolonged bed rest can have detrimental consequences that may delay or prevent the recovery from clinical illness. In order to study disuse-induced changes in muscle and bone, as observed during prolonged bed rest in humans, an innovative new model of muscle disuse for rodents is presented...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28420743/cancer-cell-metabolism-the-essential-role-of-the-nonessential-amino-acid-glutamine
#4
REVIEW
Ji Zhang, Natalya N Pavlova, Craig B Thompson
Biochemistry textbooks and cell culture experiments seem to be telling us two different things about the significance of external glutamine supply for mammalian cell growth and proliferation. Despite the fact that glutamine is a nonessential amino acid that can be synthesized by cells from glucose-derived carbons and amino acid-derived ammonia, most mammalian cells in tissue culture cannot proliferate or even survive in an environment that does not contain millimolar levels of glutamine. Not only are the levels of glutamine in standard tissue culture media at least ten-fold higher than other amino acids, but glutamine is also the most abundant amino acid in the human bloodstream, where it is assiduously maintained at approximately 0...
April 18, 2017: EMBO Journal
https://www.readbyqxmd.com/read/28414295/high-salt-intake-reprioritizes-osmolyte-and-energy-metabolism-for-body-fluid-conservation
#5
Kento Kitada, Steffen Daub, Yahua Zhang, Janet D Klein, Daisuke Nakano, Tetyana Pedchenko, Louise Lantier, Lauren M LaRocque, Adriana Marton, Patrick Neubert, Agnes Schröder, Natalia Rakova, Jonathan Jantsch, Anna E Dikalova, Sergey I Dikalov, David G Harrison, Dominik N Müller, Akira Nishiyama, Manfred Rauh, Raymond C Harris, Friedrich C Luft, David H Wassermann, Jeff M Sands, Jens Titze
Natriuretic regulation of extracellular fluid volume homeostasis includes suppression of the renin-angiotensin-aldosterone system, pressure natriuresis, and reduced renal nerve activity, actions that concomitantly increase urinary Na+ excretion and lead to increased urine volume. The resulting natriuresis-driven diuretic water loss is assumed to control the extracellular volume. Here, we have demonstrated that urine concentration, and therefore regulation of water conservation, is an important control system for urine formation and extracellular volume homeostasis in mice and humans across various levels of salt intake...
April 17, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28393216/cancer-induced-cardiac-cachexia-pathogenesis-and-impact-of-physical-activity-review
#6
Yassine Belloum, Françoise Rannou-Bekono, François B Favier
Cachexia is a wasting syndrome observed in many patients suffering from several chronic diseases including cancer. In addition to the progressive loss of skeletal muscle mass, cancer cachexia results in cardiac function impairment. During the severe stage of the disease, patients as well as animals bearing cancer cells display cardiac atrophy. Cardiac energy metabolism is also impeded with disruption of mitochondrial homeostasis and reduced oxidative capacity, although the available data remain equivocal. The release of inflammatory cytokines by tumor is a key mechanism in the initiation of heart failure...
May 2017: Oncology Reports
https://www.readbyqxmd.com/read/28392425/t-cadherin-promotes-autophagy-and-survival-in-vascular-smooth-muscle-cells-through-mek1-2-erk1-2-axis-activation
#7
Emmanouil Kyriakakis, Agne Frismantiene, Boris Dasen, Dennis Pfaff, Olga Rivero, Klaus-Peter Lesch, Paul Erne, Therese J Resink, Maria Philippova
Autophagy is an evolutionary conserved intracellular catabolic process of vital importance to cell and tissue homeostasis. Autophagy is implicated in the pathogenesis of atherosclerosis but participating cells, molecular mechanisms and functional outcomes have not been fully elucidated. T-cadherin, an atypical glycosylphosphatidylinositol-anchored member of the cadherin superfamily of adhesion molecules, is upregulated on smooth muscle cells (SMCs)(1) in atherosclerotic lesions. Here, using rat and murine aortic SMCs as experimental models, we surveyed the ability of T-cadherin to regulate autophagy in SMCs during serum-starvation stress...
April 6, 2017: Cellular Signalling
https://www.readbyqxmd.com/read/28388378/protein-turnover-and-metabolism-in-the-elderly-intensive-care-unit-patient
#8
Stuart M Phillips, Roland N Dickerson, Frederick A Moore, Douglas Paddon-Jones, Peter J M Weijs
Many intensive care unit (ICU) patients do not achieve target protein intakes particularly in the early days following admittance. This period of iatrogenic protein undernutrition contributes to a rapid loss of lean, in particular muscle, mass in the ICU. The loss of muscle in older (aged >60 years) patients in the ICU may be particularly rapid due to a perfect storm of increased catabolic factors, including systemic inflammation, disuse, protein malnutrition, and reduced anabolic stimuli. This loss of muscle mass has marked consequences...
April 2017: Nutrition in Clinical Practice
https://www.readbyqxmd.com/read/28388374/summary-points-and-consensus-recommendations-from-the-international-protein-summit
#9
Ryan T Hurt, Stephen A McClave, Robert G Martindale, Juan B Ochoa Gautier, Jorge A Coss-Bu, Roland N Dickerson, Daren K Heyland, L John Hoffer, Frederick A Moore, Claudia R Morris, Douglas Paddon-Jones, Jayshil J Patel, Stuart M Phillips, Saúl J Rugeles, Menaka Sarav Md, Peter J M Weijs, Jan Wernerman, Jill Hamilton-Reeves, Craig J McClain, Beth Taylor
The International Protein Summit in 2016 brought experts in clinical nutrition and protein metabolism together from around the globe to determine the impact of high-dose protein administration on clinical outcomes and address barriers to its delivery in the critically ill patient. It has been suggested that high doses of protein in the range of 1.2-2.5 g/kg/d may be required in the setting of the intensive care unit (ICU) to optimize nutrition therapy and reduce mortality. While incapable of blunting the catabolic response, protein doses in this range may be needed to best stimulate new protein synthesis and preserve muscle mass...
April 2017: Nutrition in Clinical Practice
https://www.readbyqxmd.com/read/28388373/protein-kinetics-and-metabolic-effects-related-to-disease-states-in-the-intensive-care-unit
#10
Robert G Martindale, Daren K Heyland, Saúl J Rugeles, Jan Wernerman, Peter J M Weijs, Jayshil J Patel, Stephen A McClave
Evaluating protein kinetics in the critically ill population remains a very difficult task. Heterogeneity in the intensive care unit (ICU) population and wide spectrum of disease processes creates complexity in assessing protein kinetics. Traditionally, protein has been delivered in the context of total energy. Focus on energy delivery has recently come into question, as the importance of supplemental protein in patient outcomes has been shown in several recent trials. The ICU patient is prone to catabolism, immobilization, and impaired immunity, which is a perfect storm for massive loss of lean body tissue with a unidirectional flow of amino acids from muscle to immune tissue for immunoglobulin production, as well as liver for gluconeogenesis and acute phase protein synthesis...
April 2017: Nutrition in Clinical Practice
https://www.readbyqxmd.com/read/28387014/weak-by-the-machines-muscle-motor-protein-dysfunction-ndash-a-side-effect-of-intensive-care-unit-treatment
#11
REVIEW
O Friedrich, S Diermeier, L Larsson
Intensive care interventions involve periods of mechanical ventilation, sedation and complete mechanical silencing of patients. Critical illness myopathy (CIM) is an ICU-acquired myopathy that is associated with limb muscle weakness, muscle atrophy, electrical silencing of muscle and motor-proteinopathy. The hallmark of CIM is a preferential muscle myosin loss due to increased catabolic and reduced anabolic activity. The ubiquitin-proteasome pathway plays an important role, apart from recently identified novel mechanisms affecting nonlysosomal protein degradation or autophagy...
April 7, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28385477/espen-guideline-clinical-nutrition-in-surgery
#12
Arved Weimann, Marco Braga, Franco Carli, Takashi Higashiguchi, Martin Hübner, Stanislaw Klek, Alessandro Laviano, Olle Ljungqvist, Dileep N Lobo, Robert Martindale, Dan L Waitzberg, Stephan C Bischoff, Pierre Singer
Early oral feeding is the preferred mode of nutrition for surgical patients. Avoidance of any nutritional therapy bears the risk of underfeeding during the postoperative course after major surgery. Considering that malnutrition and underfeeding are risk factors for postoperative complications, early enteral feeding is especially relevant for any surgical patient at nutritional risk, especially for those undergoing upper gastrointestinal surgery. The focus of this guideline is to cover nutritional aspects of the Enhanced Recovery After Surgery (ERAS) concept and the special nutritional needs of patients undergoing major surgery, e...
March 7, 2017: Clinical Nutrition: Official Journal of the European Society of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/28367506/regulation-of-protein-and-mrna-expression-of-the-mtorc1-repressor-redd1-in-response-to-leucine-and-serum
#13
Adam J Black, Bradley S Gordon, Michael D Dennis, Leonard S Jefferson, Scot R Kimball
Expression of the mTORC1 repressor, Regulated in DNA Damage and Development 1 (REDD1), is elevated in skeletal muscle during various catabolic conditions including fasting, hindlimb immobilization, and sepsis. Conversely, REDD1 expression is suppressed by anabolic stimuli such as resistance exercise or nutrient consumption following a fast. Though it is known that nutrient consumption reduces REDD1 expression, it is largely unknown how nutrients and hormones individually contribute to the reduction in REDD1 expression...
December 2016: Biochemistry and Biophysics Reports
https://www.readbyqxmd.com/read/28343576/the-metabolic-response-in-fish-to-mildly-elevated-water-temperature-relates-to-species-dependent-muscular-concentrations-of-imidazole-compounds-and-free-amino-acids
#14
Fikremariam Geda, Annelies M Declercq, Sofie C Remø, Rune Waagbø, Marta Lourenço, Geert P J Janssens
Fish species show distinct differences in their muscular concentrations of imidazoles and free amino acids (FAA). This study was conducted to investigate whether metabolic response to mildly elevated water temperature (MEWT) relates to species-dependent muscular concentrations of imidazoles and FAA. Thirteen carp and 17 Nile tilapia, housed one per aquarium, were randomly assigned to either acclimation (25°C) or MEWT (30°C) for 14 days. Main muscular concentrations were histidine (HIS; P<0.001) in carp versus N-α-acetylhistidine (NAH; P<0...
April 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/28341621/cancer-cachexia-induced-muscle-atrophy-evidence-for-alterations-in-micrornas-important-for-muscle-size
#15
David Edward Lee, Jacob L Brown, Megan E Rosa-Caldwell, Thomas A Blackwell, Richard A Perry, Lemuel A Brown, Bhuwan Khatri, Dongwon Seo, Walter Gay Bottje, Tyrone Anthony Washington, Michael P Wiggs, Byung-Whi Kong, Nicholas Perry Greene
Muscle atrophy is a hallmark of cancer cachexia resulting in impaired function and quality of life and cachexia is the immediate cause of death for 20-40% of cancer patients. Multiple microRNAs (miRNAs) have been identified as being involved in muscle development and atrophy, however less is known specifically on miRNAs in cancer cachexia. PURPOSE: The purpose of this investigation was to examine the miRNA profile of skeletal muscle atrophy induced by cancer cachexia to uncover potential miRNAs involved with this catabolic condition...
March 24, 2017: Physiological Genomics
https://www.readbyqxmd.com/read/28337956/acute-renal-graft-versus-host-disease-in-a-murine-model-of-allogeneic-bone-marrow-transplantation
#16
Peter M Schmid, Abdellatif Bouazzaoui, Karin Schmid, Christoph Birner, Christian Schach, Lars S Maier, Ernst Holler, Dierk H Endemann
Acute kidney injury (AKI) is a very common complication after allogeneic bone marrow transplantation (BMT) and associated with poor prognosis. Generally kidneys are assumed to be no direct target of Graft-versus-Host Disease (GvHD), and renal impairment is often attributed to several other factors occurring in the early phase after BMT. Our study aimed to prove the existence of renal GvHD in a fully MHC-mismatched model of BALB/c mice conditioned and transplanted according to two different intensity protocols...
March 23, 2017: Cell Transplantation
https://www.readbyqxmd.com/read/28331100/microrna-434-3p-regulates-age-related-apoptosis-through-eif5a1-in-the-skeletal-muscle
#17
Patricia S Pardo, Ameena Hajira, Aladin M Boriek, Junaith S Mohamed
Increased activation of catabolic pathways, including apoptosis causes sarcopenia. However, the precise molecular mechanism that initiates apoptosis during aging is not well understood. Here, we report that aging alters miRNA expression profile in mouse skeletal muscle as evidenced by miRNA microarray and real-time PCR. We identified miR-434-3p as a highly downregulated miRNA in the skeletal muscle of aging mice. Myocytes transfected with miR-434-3p mimic prevents apoptosis induced by various apoptotic stimuli, and co-transfection of miR-434-3p antagomir abolishes the inhibitory role of miR-434-3p...
March 22, 2017: Aging
https://www.readbyqxmd.com/read/28286066/the-emerging-impact-of-malnutrition-on-surgical-patients-literature-review-and-potential-implications-on-cystectomy-for-bladder-cancer
#18
REVIEW
Conrad M Tobert, Jill M Hamilton-Reeves, Lyse A Norian, Chermaine Hung, Nathan A Brooks, Jeff M Holzbeierlein, Tracy M Downs, Douglas P Robertson, Ruth Grossman, Kenneth G Nepple
PURPOSE: Malnutrition is emerging as a significant factor in patient outcomes. A contemporary review of malnutrition for the urologist has not been performed. We provide a review of the available literature and current standards of care for malnutrition screening, assessment, and intervention with a focus on patients with bladder cancer treated with cystectomy. MATERIALS AND METHODS: Our multi-disciplinary team conducted a PubMed search of available literature on malnutrition focusing on: definition and significance, importance to urologists, screening, assessment, diagnosis, immunologic and economic impact, and interventions...
March 9, 2017: Journal of Urology
https://www.readbyqxmd.com/read/28263150/-rhabdomyolysis-caused-by-hyperemesis-gravidarum
#19
Lana Rashid Flachs Madsen, Marie Søgaard
Hyperemesis gravidarum (HG) is a condition of severe nausea and vomiting during pregnancy, accompanied by dehydration, electrolyte derangement and lack of nutrition. We describe a 26-year-old woman pregnant at 29 weeks of gestation, complaining about muscle pain and difficulties standing up after suffering from long-term HG followed by a weight loss of 35 kg. She had severe hypokalaemia and abnormally elevated muscle enzyme concentrations as a result of a massive catabolic process. We discuss severe HG as a rare cause of rhabdomyolysis and the importance of early aggressive resuscitation to avoid renal failure...
February 27, 2017: Ugeskrift for Laeger
https://www.readbyqxmd.com/read/28257332/parathyroid-hormone-stimulates-adipose-tissue-browning-a-pathway-to-muscle-wasting
#20
Sandhya S Thomas, William E Mitch
PURPOSE OF REVIEW: Studying organ-to-organ communications (i.e. crosstalk) uncovers mechanisms regulating metabolism in several tissues. What is missing is identification of mediators of different catabolic conditions contributing to losses of adipose and muscle tissues. Identifying mediators involved in organ-to-organ crosstalk could lead to innovative therapeutic strategies because several disorders such as chronic kidney disease (CKD), cancer cachexia, and other catabolic conditions share signals of worsening metabolism and increased risk of mortality...
May 2017: Current Opinion in Clinical Nutrition and Metabolic Care
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