Read by QxMD icon Read

Muscle catabolism

Katsuhiko Warita, Nana Oshima, Naoko Takeda-Okuda, Jun-Ichi Tamura, Yoshinao Z Hosaka
Chondroitin sulfate (CS), a type of glycosaminoglycan (GAG), is a factor involved in the suppression of myogenic differentiation. CS comprises two repeating sugars and has different subtypes depending on the position and number of bonded sulfate groups. However, the effect of each subtype on myogenic differentiation remains unclear. In this study, we spiked cultures of C₂C12 myoblasts, cells which are capable of undergoing skeletal muscle differentiation, with one of five types of CS (CS-A, -B, -C, -D, or -E) and induced differentiation over a fixed time...
October 21, 2016: Marine Drugs
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
Cong Ming-Hua, Zou Bao-Hua, Yu Lei
Anorexia cancer cachexia syndrome is prevalent in advanced cancer patients, which is featured by anorexia, decreased dietary intake, body weight loss (skeletal muscle mass loss), and unable to be reversed by routine nutritional support therapy. Up to now, the main mechanisms involved in cancer cachexia include excessive systemic inflammation, which is represented by increased plasma levels of IL-1, IL-6, TNF-alpha, tumor-induced factors, such as PIF and LMF. These factors eventually act on orexigenic and anorexigenic neurons located in hypothalamus or protein and lipid metabolism of peripheral tissues, which lead to anorexia, decreased dietary intake, enhanced basic metabolism rate and hyper catabolism...
October 18, 2016: Current Pharmaceutical Biotechnology
Angela M Sanford
PURPOSE OF REVIEW: The purpose of this review is to examine the concept of anorexia of aging, including its complex pathophysiology and the multifaceted interventions required to prevent adverse health consequences from this geriatric syndrome. RECENT FINDINGS: Anorexia of aging is extremely common, occurring in up to 30% of elderly individuals; however, this diagnosis is frequently missed or erroneously attributed to a normal part of the aging process. With aging, impairments in smell and taste can limit the desire to eat...
October 5, 2016: Current Opinion in Clinical Nutrition and Metabolic Care
Masakazu Saitoh, Marcelo Rodrigues Dos Santos, Markus Anker, Stefan D Anker, Stephan von Haehling, Jochen Springer
Neuromuscular electrical stimulation (NMES) seems to be safe and beneficial in improvement in functional capacity, muscle strength, and quality of life when compared with conventional aerobic exercise, while the change in muscle fiber composition and muscle size was conflicting in patients with heart failure (HF). Moreover, NMES studies seem to have beneficial effects on pro-inflammatory cytokine, oxidative enzyme activity, and protein anabolic and catabolic metabolism that are the key molecular mechanism of muscle wasting in patients with HF...
October 1, 2016: International Journal of Cardiology
Elena Lopez-Guadamillas, Pablo J Fernandez-Marcos, Cristina Pantoja, Maribel Muñoz-Martin, Dolores Martínez, Gonzalo Gómez-López, Ramón Campos-Olivas, Angela M Valverde, Manuel Serrano
Fasting is a physiological stress that elicits well-known metabolic adaptations, however, little is known about the role of stress-responsive tumor suppressors in fasting. Here, we have examined the expression of several tumor suppressors upon fasting in mice. Interestingly, p21 mRNA is uniquely induced in all the tissues tested, particularly in liver and muscle (>10 fold), and this upregulation is independent of p53. Remarkably, in contrast to wild-type mice, p21-null mice become severely morbid after prolonged fasting...
October 10, 2016: Scientific Reports
Haiyan Zhang, Wen-Jun Shen, Yihang Li, Alex Bittner, Stefanie Bittner, Juveria Tabassum, Yuan F Cortez, Fredric B Kraemer, Salman Azhar
Nordihydroguaiaretic acid (NDGA), the main metabolite of Creosote Bush, has been shown to have profound effects on the core components of metabolic syndrome, including lowering of blood glucose, free fatty acids and triglyceride levels, attenuating elevated blood pressure in several rodent models of dyslipidemia, and improving body weight, insulin resistance, diabetes and hypertension. In the present study, a high-fructose diet fed rat model of hypertriglyceridemia, dyslipidemia, insulin resistance and hepatic steatosis was employed to investigate the global transcriptional changes in the lipid metabolizing pathways in three insulin sensitive tissues: liver, skeletal muscle and adipose tissue in response to chronic dietary administration of NDGA...
2016: Nutrition & Metabolism
Belinda Spoto, Anna Pisano, Carmine Zoccali
Insulin resistance (IR) is an early metabolic alteration in CKD patients, being apparent when the glomerular filtration rate is still within the normal range and becoming almost universal in those who reach the ESKF. The skeletal muscle represents the primary site of IR in CKD and post-receptor alterations are recognized as the main defect underlying IR in this condition. Estimates of IR based on fasting insulin concentration are easier but may not be adequate in CKD patients because renal insufficiency reduces insulin catabolism...
October 5, 2016: American Journal of Physiology. Renal Physiology
Y C Han, Y G Sun, Q Li
Growth hormone (GH) plays an important role in promoting growth, protein and muscle accretion, and fat catabolism, suggesting that GH is a potential candidate gene affecting growth traits in vertebrates. In this paper, polymorphisms in GH were investigated in 632 Chinese Tibetan sheep, by using DNA sequencing. Three single nucleotide polymorphisms were identified, including two mutations (g.616G>A and g.624G>A) in intron 2 and one synonymous mutation (g.498G>C) in exon 2. Association analyses showed that both g...
August 26, 2016: Genetics and Molecular Research: GMR
Beomjeong Kim, Jeongjin Park, Ho-Geun Yoon, Kyung-Chul Choi, Kyungmi Kim, Jeongmin Lee, Jin Woong Chung, Sangin Shim, Yanghee You, Woojin Jun
The effects of Canavalia gladiata ethanolic extract on endurance swimming capacity were evaluated in a mouse model. The mice were orally administered distilled water (CON), hot water extract (CGW), or 80% ethanol extract (CGE). The swimming time to exhaustion was significantly prolonged in the CGE group. Of the three groups, the CGE showed the lowest blood lactate and the highest nonesterified fatty acid and muscle glycogen levels. These results suggest that the administration of CGE could improve endurance swimming capacity by enhancing lipid catabolism and thereby preserving glycogen stores...
October 3, 2016: Journal of Medicinal Food
Joachim Nielsen, Kasper D Gejl, Martin Hey-Mogensen, Hans-Christer Holmberg, Charlotte Suetta, Peter Krustrup, Coen P H Elemans, Niels Ørtenblad
Mitochondrial energy production involves the movement of protons down a large electrochemical gradient through ATP synthase located on the folded inner membrane, known as cristae. In mammalian skeletal muscle, the density of cristae in mitochondria is thought to be constant. However, recent experimental studies have shown that respiration per mitochondria varies.Modelling studies have hypothesised that this variation in respiration per mitochondria depends on plasticity in cristae density, but currently evidence for such a mechanism is lacking...
October 3, 2016: Journal of Physiology
Carles Lerin, Allison B Goldfine, Tanner Boes, Manway Liu, Simon Kasif, Jonathan M Dreyfuss, Ana Luisa De Sousa-Coelho, Grace Daher, Irini Manoli, Justin R Sysol, Elvira Isganaitis, Niels Jessen, Laurie J Goodyear, Kirk Beebe, Walt Gall, Charles P Venditti, Mary-Elizabeth Patti
OBJECTIVE: Plasma levels of branched-chain amino acids (BCAA) are consistently elevated in obesity and type 2 diabetes (T2D) and can also prospectively predict T2D. However, the role of BCAA in the pathogenesis of insulin resistance and T2D remains unclear. METHODS: To identify pathways related to insulin resistance, we performed comprehensive gene expression and metabolomics analyses in skeletal muscle from 41 humans with normal glucose tolerance and 11 with T2D across a range of insulin sensitivity (SI, 0...
October 2016: Molecular Metabolism
Suriyan Ponnusamy, Ryan D Sullivan, Thirumagal Thiyagarajan, Heather Tillmann, Robert H Getzenberg, Ramesh Narayanan
OBJECTIVES: To evaluate two selective androgen receptor modulators (SARMs) (GTx-024 and GTx-027) in a post-menopausal animal model in order to determine their effect on pelvic floor muscles. Stress urinary incontinence (SUI), a prevalent condition, is represented by an involuntary leakage of urine that results, at least in part, from weakened or damaged pelvic floor muscles and is triggered by physical stress. Current treatment options are limited with no oral therapies available. The pelvic floor is rich in androgen receptor and molecules with anabolic activity including (SARMs) may serve as therapeutic options for individuals with SUI...
September 28, 2016: Journal of Cellular Biochemistry
Wakako Tsuchida, Masahiro Iwata, Takayuki Akimoto, Shingo Matsuo, Yuji Asai, Shigeyuki Suzuki
It is generally recognized that synthetic glucocorticoids induce skeletal muscle weakness, and endogenous glucocorticoid levels increase in patients with muscle atrophy. It is reported that heat stress attenuates glucocorticoid-induced muscle atrophy; however, the mechanisms involved are unknown. Therefore, we examined the mechanisms underlying the effects of heat stress against glucocorticoid-induced muscle atrophy using C2C12 myotubes in vitro, focusing on expression of key molecules and signaling pathways involved in regulating protein synthesis and degradation...
September 20, 2016: Journal of Cellular Physiology
Rosa M Pérez-Serrano, M Laura González-Dávalos, Carlos Lozano-Flores, Armando Shimada, Anaid Antaramian, Alfredo Varela-Echavarría, Ofelia Mora
PURPOSE: The aim of this work was to evaluate the effect of PPAR agonists on the differentiation and metabolic features of porcine mesenchymal stem cells induced to the adipogenic or myogenic lineages. METHODS: Bone marrow MSCs from neonate pigs were isolated and identified by cell proliferation, cell surface markers or the gene expression of stem cells (CD44, CD90, CD105 or Oct4 and Nanog, respectively). Cells were differentiated into adipose or muscle cells and treated with the PPAR agonists; adipogenic and myogenic differentiation was promoted by adding these compounds...
September 20, 2016: Cells, Tissues, Organs
Mohamad Assi, Amélie Rébillard
Chronic inflammation and excessive loss of skeletal muscle usually occur during cancer cachexia, leading to functional impairment and delaying the cure of cancer. The release of cytokines by tumor promotes the formation of reactive oxygen species (ROS), which in turn regulate catabolic pathways involved in muscle atrophy. ROS also exert a dual role within tumor itself, as they can either promote proliferation and vascularization or induce senescence and apoptosis. Accordingly, previous studies that used antioxidants to modulate these ROS-dependent mechanisms, in cancer and cancer cachexia, have obtained contradictory results, hence the need to gather the main findings of these studies and draw global conclusions in order to stimulate more oriented research in this field...
2016: Oxidative Medicine and Cellular Longevity
Theodorus B M Hakvoort, Youji He, Wim Kulik, Jacqueline L M Vermeulen, Suzanne Duijst, Jan M Ruijter, Jurgen H Runge, Nicolaas E P Deutz, S Eleonore Koehler, Wouter H Lamers
: Glutamine synthetase (GS) catalyzes condensation of ammonia with glutamate to glutamine. Glutamine serves, with alanine, as major nontoxic interorgan ammonia carrier. Elimination of hepatic GS expression in mice causes only mild hyperammonemia and hypoglutaminemia, but a pronounced decrease in the whole-body muscle-to-fat ratio with increased myostatin expression in muscle. Using GS-KO/Liver and control mice, and stepwise increments of enterally infused ammonia, we show that ∼35% of this ammonia is detoxified by hepatic GS and ∼35% by urea-cycle enzymes, while ∼30% is not cleared by the liver, independent of portal ammonia concentrations ≤2 mmol/L...
September 19, 2016: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
Francesco Bifari, Enzo Nisoli
Substantial evidences have been accumulated to suggest the positive effect of branched-chain amino acid (BCAA) supplementation or BCAA-rich diets on the regulation of body weight, muscle protein synthesis, glucose homeostasis, aging process, and healthspan extension. Despite these beneficial effects, epidemiological studies have shown that altered BCAA plasma concentrations and BCAA metabolism are present in several metabolic disorders, including type 2 diabetes mellitus (T2DM) and cardiovascular diseases (CVD)...
September 17, 2016: British Journal of Pharmacology
Jann Arends, Patrick Bachmann, Vickie Baracos, Nicole Barthelemy, Hartmut Bertz, Federico Bozzetti, Ken Fearon, Elisabeth Hütterer, Elizabeth Isenring, Stein Kaasa, Zeljko Krznaric, Barry Laird, Maria Larsson, Alessandro Laviano, Stefan Mühlebach, Maurizio Muscaritoli, Line Oldervoll, Paula Ravasco, Tora Solheim, Florian Strasser, Marian de van der Schueren, Jean-Charles Preiser
Cancers are among the leading causes of morbidity and mortality worldwide, and the number of new cases is expected to rise significantly over the next decades. At the same time, all types of cancer treatment, such as surgery, radiation therapy, and pharmacological therapies are improving in sophistication, precision and in the power to target specific characteristics of individual cancers. Thus, while many cancers may still not be cured they may be converted to chronic diseases. All of these treatments, however, are impeded or precluded by the frequent development of malnutrition and metabolic derangements in cancer patients, induced by the tumor or by its treatment...
August 6, 2016: Clinical Nutrition: Official Journal of the European Society of Parenteral and Enteral Nutrition
René G Feichtinger, Erika Pétervári, Michaela Zopf, Silvia Vidali, Sepideh Aminzadeh-Gohari, Johannes A Mayr, Barbara Kofler, Márta Balaskó
Hypothalamic alpha-melanocyte-stimulating hormone (α-MSH) is a key catabolic mediator of energy homeostasis. Its anorexigenic and hypermetabolic effects show characteristic age-related alterations that may be part of the mechanism of middle-aged obesity and geriatric anorexia/cachexia seen in humans and other mammals. We aimed to investigate the role of α-MSH in mitochondrial energy metabolism during the course of aging in a rodent model. To determine the role of α-MSH in mitochondrial energy metabolism in muscle, we administered intracerebroventricular (ICV) infusions of α-MSH for 7-days to different age-groups of male Wistar rats...
August 26, 2016: Neuropeptides
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"