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https://www.readbyqxmd.com/read/28713900/nlrc5-silencing-ameliorates-cardiac-fibrosis-by-inhibiting-the-tgf%C3%A2-%C3%AE-1-smad3-signaling-pathway
#1
Hongtao Zhou, Xuefang Yu, Guiming Zhou
The proliferation of cardiac fibroblasts (CFs) and excessive deposition of extracellular matrix are the predominant pathological characteristics of cardiac fibrosis. As the largest member of the nucleotide‑binding domain and leucine‑rich repeat (NLR) family, NLRC5 has been shown to be pivotal in the development of hepatic fibrosis. However, whether NLRC5 is involved in the pathogenesis of cardiac fibrosis remains to be elucidated. The present study aimed to investigate the role of NLRC5 and its mechanisms in regulating cardiac fibrosis...
July 14, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28704095/sarcopenia-an-endocrine-disorder
#2
Alexis McKee, John E Morley, Alvin M Matsumoto, Aaron Vinik
Sarcopenia is defined as low muscle function (walking speed or grip strength) in the presence of low muscle mass. A simple screening test - the SARC-F - is available to identify persons with sarcopenia. The major endocrine causes of sarcopenia are diabetes mellitus and male hypogonadism. Other causes are decreased physical activity, loss of motor neuron units, weight loss, inflammatory cytokines, reduced blood flow to muscles, very low 25(OH) vitamin D levels and decreased growth hormone and IGF-1. Treatment for sarcopenia includes resistance and aerobic exercise, leucine enriched essential amino acids, and vitamin D...
July 13, 2017: Endocrine Practice
https://www.readbyqxmd.com/read/28690550/targeting-inflammation-and-downstream-protein-metabolism-in-sarcopenia-a-brief-up-dated-description-of-concurrent-exercise-and-leucine-based-multimodal-intervention
#3
REVIEW
Zhi Xia, Jason Cholewa, Yan Zhao, Hua-Yu Shang, Yue-Qin Yang, Kassiana Araújo Pessôa, Quan-Sheng Su, Fernanda Lima-Soares, Nelo Eidy Zanchi
Sarcopenia is defined as the progressive loss of muscle mass with age, and poses a serious threat to the physiological and psychological health of the elderly population with consequential economic and social burdens. Chronic low-grade inflammation plays a central role in the development of sarcopenia such that it alters cellular protein metabolism to favor proteolysis over synthesis, and thereby accelerates muscular atrophy. The purpose of this review is to highlight how exercise and nutrition intervention strategies can attenuate or treat sarcopenia...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28683706/sarcopenia-what-should-a-pharmacist-know
#4
Alfonso J Cruz-Jentoft
Sarcopenia (or muscle insufficiency) is a geriatric syndrome characterized by a progressive and generalized loss of skeletal muscle mass and function which has adverse consequences, particularly physical disability, falls and death. It can develop slowly, as a chronic condition that emerges over many years, or acutely, generally due to immobilization associated with an acute disease. The physiopathology of sarcopenia is complex, and affects both the muscle and its neurological and hormonal regulation...
July 1, 2017: Farmacia Hospitalaria
https://www.readbyqxmd.com/read/28668481/life-extending-dietary-restriction-and-ovariectomy-each-increase-leucine-oxidation-and-alter-leucine-allocation-in-grasshoppers
#5
John D Hatle, Ayesha Awan, Justin Nicholas, Ryan Koch, Julie R Vokrri, Marshall D McCue, Caroline M Williams, Goggy Davidowitz, Daniel A Hahn
Reduced reproduction and dietary restriction each extend lifespan in many animal models, but possible contributions of nutrient oxidation and allocation are largely unknown. Ovariectomy and eating 70% of ad libitum-feeding each extend lifespan in lubber grasshoppers. When feeding levels between the two groups are matched, ovariectomy increases fat and protein storage while dietary restriction reduces fat storage. Because of these disparities in nutrient investment, metabolism may differ between these two life-extending treatments...
June 28, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28646031/metabolism-and-acetylation-contribute-to-leucine-mediated-inhibition-of-cardiac-glucose-uptake
#6
Edith Renguet, Audrey Ginion, Roselle Gélinas, Laurent Bultot, Julien Auquier, Isabelle Robillard Frayne, Caroline Daneault, Jean-Louis Vanoverschelde, Christine Des Rosiers, Louis Hue, Sandrine Horman, Christophe Beauloye, Luc Bertrand
High plasma leucine levels strongly correlate with type 2 diabetes. Studies of muscle cells suggest that leucine alters the insulin response for glucose transport by activating an insulin-negative feedback loop driven by the mammalian target of rapamycin/p70 ribosomal S6 kinase (mTOR/p70S6K) pathway. Here, we examined the molecular mechanism involved in leucine's action on cardiac glucose uptake. Leucine was indeed able to curb glucose uptake after insulin stimulation in both cultured cardiomyocytes and perfused hearts...
June 23, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28643619/dietary-leucine-supplementation-alters-energy-metabolism-and-induces-slow-to-fast-transitions-in-longissimus-dorsi-muscle-of-weanling-piglets
#7
Qiwen Fan, Baisheng Long, Guokai Yan, Zhichang Wang, Min Shi, Xiaoyu Bao, Jun Hu, Xiuzhi Li, Changqing Chen, Zilong Zheng, Xianghua Yan
Leucine plays an important role in promoting muscle protein synthesis and muscle remodelling. However, what percentage of leucine is appropriate in creep feed and what proteome profile alterations are caused by dietary leucine in the skeletal muscle of piglets remain elusive. In this case, we applied isobaric tags for relative and absolute quantitation to analyse the proteome profile of the longissimus dorsi muscles of weanling piglets fed a normal leucine diet (NL; 1·66 % leucine) and a high-leucine diet (HL; 2·1 % leucine)...
May 2017: British Journal of Nutrition
https://www.readbyqxmd.com/read/28642676/international-society-of-sports-nutrition-position-stand-protein-and-exercise
#8
REVIEW
Ralf Jäger, Chad M Kerksick, Bill I Campbell, Paul J Cribb, Shawn D Wells, Tim M Skwiat, Martin Purpura, Tim N Ziegenfuss, Arny A Ferrando, Shawn M Arent, Abbie E Smith-Ryan, Jeffrey R Stout, Paul J Arciero, Michael J Ormsbee, Lem W Taylor, Colin D Wilborn, Doug S Kalman, Richard B Kreider, Darryn S Willoughby, Jay R Hoffman, Jamie L Krzykowski, Jose Antonio
The International Society of Sports Nutrition (ISSN) provides an objective and critical review related to the intake of protein for healthy, exercising individuals. Based on the current available literature, the position of the Society is as follows:An acute exercise stimulus, particularly resistance exercise, and protein ingestion both stimulate muscle protein synthesis (MPS) and are synergistic when protein consumption occurs before or after resistance exercise.For building muscle mass and for maintaining muscle mass through a positive muscle protein balance, an overall daily protein intake in the range of 1...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28642232/a-single-amino-acid-residue-at-transmembrane-domain-4-of-the-alpha-subunit-influences-carisoprodol-direct-gating-efficacy-at-gabaa-receptors
#9
Manoj Kumar, Manish Kumar, John Freund, Glenn H Dillon
The muscle relaxant carisoprodol (CSP, trade name Soma) has recently been controlled at the federal level as a Schedule IV drug due to its high abuse potential and consequences of misuse, such as withdrawal syndrome, delusions, seizures and even death. Recent work has shown that carisoprodol can directly gate and allosterically modulate the GABAA receptor. These actions are subunit-dependent; compared to other GABAA receptors, carisoprodol has nominal direct gating effects in α3β2γ2receptors. Here, using site-directed-mutagenesis and whole cell patch clamp electrophysiology in transiently transfected HEK293 cells, we examined the role of GABAA receptor α subunit transmembrane domain 4 (TM4) amino acids in direct gating and allosteric modulatory actions of carisoprodol...
June 22, 2017: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/28640602/dietary-n-carbamylglutamate-supplementation-in-a-reduced-protein-diet-affects-carcass-traits-and-the-profile-of-muscle-amino-acids-and-fatty-acids-in-finishing-pigs
#10
Changchuan Ye, Xiangzhou Zeng, Jinlong Zhu, Ying Liu, Qianhong Ye, Shiyan Qiao, Xiangfang Zeng
The aim of this study was to investigate whether dietary N-carbamylglutamate (NCG) supplementation in a reduced protein diet affected carcass traits and meat quality in finishing pigs. A total of 120 gilts were randomly assigned to one of four treatments for 40 days, including a standard protein diet (SP), a reduced protein diet supplemented with 1.7% l-alanine (RP + Ala), a reduced protein diet supplemented with 1.0% l-arginine (RP + Arg), and a reduced protein diet supplemented with 0.1% NCG and 1.7% l-alanine (RP + NCG)...
July 7, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28638350/branched-chain-amino-acid-ingestion-stimulates-muscle-myofibrillar-protein-synthesis-following-resistance-exercise-in-humans
#11
Sarah R Jackman, Oliver C Witard, Andrew Philp, Gareth A Wallis, Keith Baar, Kevin D Tipton
The ingestion of intact protein or essential amino acids (EAA) stimulates mechanistic target of rapamycin complex-1 (mTORC1) signaling and muscle protein synthesis (MPS) following resistance exercise. The purpose of this study was to investigate the response of myofibrillar-MPS to ingestion of branched-chain amino acids (BCAAs) only (i.e., without concurrent ingestion of other EAA, intact protein, or other macronutrients) following resistance exercise in humans. Ten young (20.1 ± 1.3 years), resistance-trained men completed two trials, ingesting either 5...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28624653/giant-ring-mitochondria-in-a-patient-with-heart-failure-and-cerebral-white-matter-disease-due-to-mt-tl1-mitochondrial-gene-mutation
#12
Brian A Houston, Daniel P Judge, Emily Brown, Marc Halushka, Lili A Barouch
BACKGROUND: The presence of giant ring mitochondria on endomyocardial biopsy is rarely reported and does not have a well-defined differential diagnosis. METHODS: We report the case of a 54-year-old man with heart failure with preserved ejection fraction and left ventricular hypertrophy, initially thought to have an infiltrative cardiomyopathy. RESULTS: The patient was found to have extensive vacuolization caused by the presence of giant ring mitochondria on endomyocardial biopsy...
June 14, 2017: Journal of Cardiac Failure
https://www.readbyqxmd.com/read/28621016/acute-effects-of-phenylbutyrate-on-glutamine-branched-chain-amino-acid-and-protein-metabolism-in-skeletal-muscles-of-rats
#13
Milan Holecek, Melita Vodenicarovova, Pavel Siman
Phenylbutyrate (PB) acts as chemical chaperone and histone deacetylase inhibitor, which is used to decrease ammonia in urea cycle disorders and has been investigated for use in the treatment of a number of lethal illnesses. We performed in vivo and in vitro experiments to examine the effects of PB on glutamine (GLN), branched-chain amino acid (BCAA; valine, leucine and isoleucine) and protein metabolism in rats. In the first study, animals were sacrificed one hour after three injections of PB (300mg/kg b...
June 16, 2017: International Journal of Experimental Pathology
https://www.readbyqxmd.com/read/28615380/leucine-differentially-regulates-gene-specific-translation-in-mouse-skeletal-muscle
#14
Micah J Drummond, Paul T Reidy, Lisa M Baird, Brian K Dalley, Michael T Howard
Background: Amino acids, especially leucine, are particularly effective in promoting protein synthesis. Leucine is known to increase the rate of protein synthesis in skeletal muscle through the mechanistic target of rapamycin complex 1-dependent, as well as -independent, signaling pathways. However, the overall translation program is poorly defined, and it is unknown how the activation of these pathways differentially controls the translation of specific mRNAs.Objective: Ribosome profiling and RNA sequencing were used to precisely define the translational program activated by an acute oral dose of leucine...
June 14, 2017: Journal of Nutrition
https://www.readbyqxmd.com/read/28608438/a-randomized-clinical-trial-investigating-the-efficacy-of-targeted-nutrition-as-adjunct-to-exercise-training-in-copd
#15
Coby van de Bool, Erica P A Rutten, Ardy van Helvoort, Frits M E Franssen, Emiel F M Wouters, Annemie M W J Schols
BACKGROUND: Evidence regarding the efficacy of nutritional supplementation to enhance exercise training responses in COPD patients with low muscle mass is limited. The objective was to study if nutritional supplementation targeting muscle derangements enhances outcome of exercise training in COPD patients with low muscle mass. METHODS: Eighty-one COPD patients with low muscle mass, admitted to out-patient pulmonary rehabilitation, randomly received oral nutritional supplementation, enriched with leucine, vitamin D, and omega-3 fatty acids (NUTRITION) or PLACEBO as adjunct to 4 months supervised high intensity exercise training...
June 12, 2017: Journal of Cachexia, Sarcopenia and Muscle
https://www.readbyqxmd.com/read/28596078/identification-of-an-oxytocinase-vasopressinase-like-leucyl-cystinyl-aminopeptidase-lnpep-in-teleost-fish-and-evidence-for-hypothalamic-mrna-expression-linked-to-behavioral-social-status
#16
Emma A Elkins, Kayla A Walti, Kathryn E Newberry, Sean C Lema
The vasotocin/vasopressin and isotocin/mesotocin/oxytocin family of nonapeptides regulate social behaviors and physiological functions associated with reproductive physiology and osmotic balance. While experimental and correlative studies provide evidence for these nonapeptides as modulators of behavior across all classes of vertebrates, mechanisms for nonapeptide inactivation in regulating these functions have been largely overlooked. Leucyl-cystinyl aminopeptidase (LNPEP) - also known as vasopressinase, oxytocinase, placental leucine aminopeptidase (P-LAP), and insulin-regulated aminopeptidase (IRAP) - is a membrane-bound zinc-dependent metalloexopeptidase enzyme that inactivates vasopressin, oxytocin, and select other cyclic polypeptides...
June 6, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28592027/-glyburide-prevents-pulmonary-artery-smooth-muscle-cell-proliferation-and-migration-via-inhibiting-nlrp3-activation
#17
Y F Liu, W Wang, T Liu, W Zhang, J Liu, J Wang
Objective: To investigate whether glyburide prevents platelet-derived growth factor (PDGF) induced pulmonary artery smooth muscle cells(PASMCs) proliferation and migration via inhibiting nucleotide binding domain leucine-rich repeat-containing receptors protein 3(NLRP3) inflammasome activation. Methods: PASMCs were divided into 4 groups: control group, glyburide group, PDGF group and PDGF+ glyburide group. Cell proliferation and migration were assessed by MTT and Transwell respectively. The NLRP3 inflammasome activation was assessed by Western blot...
June 12, 2017: Chinese Journal of Tuberculosis and Respiratory Diseases
https://www.readbyqxmd.com/read/28588499/intake-of-a-ketone-ester-drink-during-recovery-from-exercise-promotes-mtorc1-signaling-but-not-glycogen-resynthesis-in-human-muscle
#18
Tijs Vandoorne, Stefan De Smet, Monique Ramaekers, Ruud Van Thienen, Katrien De Bock, Kieran Clarke, Peter Hespel
Purpose: Ketone bodies are energy substrates produced by the liver during prolonged fasting or low-carbohydrate diet. The ingestion of a ketone ester (KE) rapidly increases blood ketone levels independent of nutritional status. KE has recently been shown to improve exercise performance, but whether it can also promote post-exercise muscle protein or glycogen synthesis is unknown. Methods: Eight healthy trained males participated in a randomized double-blind placebo-controlled crossover study. In each session, subjects undertook a bout of intense one-leg glycogen-depleting exercise followed by a 5-h recovery period during which they ingested a protein/carbohydrate mixture...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28575008/plasma-metabolome-and-skin-proteins-in-charcot-marie-tooth-1a-patients
#19
Beatriz Soldevilla, Carmen Cuevas-Martín, Clara Ibáñez, Fulvio Santacatterina, María A Alberti, Carolina Simó, Carlos Casasnovas, Celedonio Márquez-Infante, Teresa Sevilla, Samuel I Pascual, María Sánchez-Aragó, Carmen Espinos, Francesc Palau, José M Cuezva
OBJECTIVE: Charcot-Marie-Tooth 1A (CMT1A) disease is the most common inherited neuropathy that lacks of therapy and of molecular markers to assess disease severity. Herein, we have pursued the identification of potential biomarkers in plasma samples and skin biopsies that could define the phenotype of CMT1A patients at mild (Mi), moderate (Mo) and severe (Se) stages of disease as assessed by the CMT neuropathy score to contribute to the understanding of CMT pathophysiology and eventually inform of the severity of the disease...
2017: PloS One
https://www.readbyqxmd.com/read/28574481/leucine-supplementation-differently-modulates-branched-chain-amino-acid-catabolism-mitochondrial-function-and-metabolic-profiles-at-the-different-stage-of-insulin-resistance-in-rats-on-high-fat-diet
#20
Rui Liu, Hui Li, Wenjuan Fan, Qiu Jin, Tingting Chao, Yuanjue Wu, Junmei Huang, Liping Hao, Xuefeng Yang
The available findings concerning the association between branched-chain amino acids (BCAAs)-particularly leucine-and insulin resistance are conflicting. BCAAs have been proposed to elicit different or even opposite effects, depending on the prevalence of catabolic and anabolic states. We tested the hypothesis that leucine supplementation may exert different effects at different stages of insulin resistance, to provide mechanistic insights into the role of leucine in the progression of insulin resistance. Male Sprague-Dawley rats were fed a normal chow diet, high-fat diet (HFD), HFD supplemented with 1...
June 2, 2017: Nutrients
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