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Muscle metabolism

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https://www.readbyqxmd.com/read/29353351/the-multiple-roles-of-titin-in-muscle-contraction-and-force-production
#1
REVIEW
Walter Herzog
Titin is a filamentous protein spanning the half-sarcomere, with spring-like properties in the I-band region. Various structural, signaling, and mechanical functions have been associated with titin, but not all of these are fully elucidated and accepted in the scientific community. Here, I discuss the primary mechanical functions of titin, including its accepted role in passive force production, stabilization of half-sarcomeres and sarcomeres, and its controversial contribution to residual force enhancement, passive force enhancement, energetics, and work production in shortening muscle...
January 20, 2018: Biophysical Reviews
https://www.readbyqxmd.com/read/29353241/inhibition-of-endothelial-notch-signaling-impairs-fatty-acid-transport-and-leads-to-metabolic-and-vascular-remodeling-of-the-adult-heart
#2
Markus Jabs, Adam J Rose, Lorenz H Lehmann, Jacqueline Taylor, Iris Moll, Tjeerd P Sijmonsma, Stefanie E Herberich, Sven W Sauer, Gernot Poschet, Giuseppina Federico, Carolin Mogler, Eva-Maria Weis, Hellmut G Augustin, Minhong Yan, Norbert Gretz, Roland M Schmid, Ralf H Adams, Hermann-Joseph Gröne, Rüdiger Hell, Jürgen G Okun, Johannes Backs, Peter P Nawroth, Stephan Herzig, Andreas Fischer
Background -Nutrients are transported through endothelial cells before being metabolized in muscle cells. However, little is known about the regulation of endothelial transport processes. Notch signaling is a critical regulator of metabolism and angiogenesis during development. Here, we studied how genetic and pharmacological manipulation of endothelial Notch signaling in adult mice affects endothelial fatty acid transport, cardiac angiogenesis, and heart function. Methods -Endothelial-specific Notch inhibition was achieved by conditional genetic inactivation of Rbp-jκ in adult mice to analyze fatty acid metabolism and heart function...
January 20, 2018: Circulation
https://www.readbyqxmd.com/read/29352759/regional-myocardial-function-abnormalities-are-associated-with-macro-and-microcirculation-dysfunction-in-the-metabolic-syndrome-the-resolve-study
#3
Philippe Obert, Guillaume Walther, Frédéric Dutheil, Bruno Lesourd, Robert Chapier, Daniel Courteix, Agnes Vinet
Abnormalities in myocardial and vascular function have been reported in the metabolic syndrome (MetS), but whether these alterations are related remains poorly documented. Our aim was accordingly to investigate interrelationships between macro- and microcirculatory vasoreactivity and left ventricular (LV) myocardial function in MetS patients. Eighty-eight MetS individuals and 44 age- and gender-matched healthy controls were enrolled. LV global longitudinal strain (GLS) was measured using Vector Velocity Imaging...
January 19, 2018: Heart and Vessels
https://www.readbyqxmd.com/read/29351485/insulin-signaling-displayed-a-differential-tissue-specific-response-to-low-dose-dht-in-female-mice
#4
Stanley Andrisse, Katelyn Billings, Ping Xue, Sheng Wu
Hyperandrogenemia and hyperinsulinemia are believed to play prominent roles in polycystic ovarian syndrome (PCOS). We explored the effects of low dose dihydrotestosterone (DHT), a PCOS model, on insulin signaling in metabolic and re-productive tissues in a female mouse model. Insulin resistance in the energy storage tissues is associated with type 2 diabetes. Insulin signaling in the ovaries and pituitary either directly or indirectly stimulates androgen production. Energy storage and reproductive tissues were isolated and molecular assays were performed...
December 19, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29351481/regulation-of-glucose-metabolism-in-non-diabetic-metabolically-obese-normal-weight-asians
#5
Cherlyn Ding, Zhiling Chan, Yu Chung Chooi, John Choo, Suresh Anand Sadananthan, Amanda Chang, S Sasikala, Navin Michael, S Sendhil Velan, Faidon Magkos
Type 2 diabetes in Asia occurs largely in the absence of obesity. The metabolically-obese normal-weight (MONW) phenotype refers to lean subjects with metabolic dysfunction that is typically observed in people with obesity, and is associated with increased risk for diabetes. Previous studies evaluated MONW subjects who had greater BMI or total body fat than respective control groups, making interpretation of the results difficult. We evaluated insulin sensitivity (hyperinsulinemic-euglycemic clamp), insulin secretion (mixed meal with oral minimal modeling), intra-abdominal, muscle, and liver fat contents (magnetic resonance), and fasting and postprandial glucose and insulin concentrations in 18 MONW subjects and 18 metabolically-healthy controls matched for age (43{plus minus}3 and 40{plus minus}3 y; P=0...
January 2, 2018: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29351462/maximal-strength-training-induced-improvements-in-forearm-work-efficiency-are-associated-with-reduced-blood-flow
#6
Ole Kristian Berg, Stian Kwak Nyberg, Tobias Midtvedt Windedal, Eivind Wang
Maximal strength training (MST) improves work efficiency. However, since blood flow is greatly dictated by muscle contractions in arms during exercise, and vascular conductance is lower, it has been indicated that arms rely more upon adapting oxygen extraction than legs in response to the enhanced work efficiency. Thus, to investigate if metabolic and vascular responses are arm-specific, we utilized Doppler-ultrasound and a catheter placed in the subclavian vein to measure blood flow and a-vO2diff during steady state work in seven young males (24{plus minus}3(SD) years) following six-weeks of handgrip MST...
December 29, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29350465/proteomics-analysis-of-skeletal-muscle-from-leptin-deficient-ob-ob-mice-reveals-adaptive-remodeling-of-metabolic-characteristics-and-fiber-type-composition
#7
Milena Schönke, Marie Björnholm, Alexander V Chibalin, Juleen R Zierath, Atul S Deshmukh
Skeletal muscle insulin resistance, an early metabolic defect in the pathogenesis of type 2 diabetes, may be a cause or consequence of altered protein expressions profiles. Proteomics technology offers enormous promise to investigate molecular mechanisms underlying pathologies, however, the analysis of skeletal muscle is challenging. Using state-of-the-art multi-enzyme digestion and filter-aided sample preparation (MED-FASP) and a mass spectrometry (MS) based workflow, we performed a global proteomics analysis of skeletal muscle from leptin-deficient, obese, insulin resistant (ob/ob) and lean mice in mere two fractions in a short time (8 hours/sample)...
January 19, 2018: Proteomics
https://www.readbyqxmd.com/read/29350420/over-expression-of-dec1-inhibits-myogenic-differentiation-by-modulating-myog-activity-in-bovine-satellite-cell
#8
Yongzhen Huang, Xinsheng Lai, Linyong Hu, Chuzhao Lei, Xianyong Lan, Chunlei Zhang, Yun Ma, Li Zheng, Yue-Yu Bai, Fengpeng Lin, Hong Chen
Differentiated embryo chondrocyte 1 (DEC1), a member of basic-helix-loop-helix transcription factor Bhlhe40, also called stimulated by retinoic acid 13, STRA13, plays an important role in the regulation of adipogenesis, tumorigenesis, peripheral circadian output, response to hypoxia and development of metabolic syndrome. Previous studies suggested that DEC1 was involved in skeletal muscle development; however, its precise role in myoblast differentiation has not been determined. In the present study, we showed that DEC1 expressed ubiquitously in different bovine tissues and was down-regulated in differentiated bovine satellite cells...
January 19, 2018: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29350264/linking-muscle-metabolism-and-functional-variation-to-field-swimming-performance-in-bluegill-sunfish-lepomis-macrochirus
#9
David J Ellerby, Shauna Cyr, Angela X Han, Mika Lin, Lloyd A Trueblood
Skeletal muscle has diverse mechanical roles during locomotion. In swimming fish, power-producing muscles work in concert with the accessory muscles of the fins which augment and control power transfer to the water. Although fin muscles represent a significant proportion of the locomotor muscle mass, their physiological properties are poorly characterized. To examine the relationship between muscle metabolism and the differing mechanical demands placed on distinct muscle groups, we quantified the aerobic and glycolytic capacities of the myotomal, pectoral and caudal muscles of bluegill sunfish...
January 19, 2018: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/29349700/adrenergic-and-metabolic-effects-of-electrical-weapons-review-and-meta-analysis-of-human-data
#10
REVIEW
S N Kunz, H G Calkins, J Adamec, M W Kroll
INTRODUCTION: Electronic control with the CEW (conducted electrical weapon) has gained widespread acceptance as the preferred force option due to its significant injury reduction. However, a CEW application does stress the human body. In the case of the CEW, the human body response is similar to the challenge of physical exercise combined with emotional stress over a very short time interval. There has been concern whether the tension of the skeletal-muscle system together with the emotional stress of being exposed to the effects of a CEW, can lead to severe metabolic dysfunction...
January 19, 2018: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/29349633/effects-of-tetradecylthioacetic-acid-tta-treatment-on-lipid-metabolism-in-salmon-hearts-in-vitro-and-in-vivo-studies
#11
Regin Arge, Jens-Erik Dessen, Tone-Kari Østbye, Bente Ruyter, Magny S Thomassen, Kjell-Arne Rørvik
In intensive farming of Atlantic salmon, a large proportion of observed mortality is related to cardiovascular diseases and circulatory failure, indicating insufficient robustness and inadequate cardiac performance. This paper reports on the use of tetradecylthioacetic acid (TTA) where the main objective was to enhance utilisation of fatty acids (FA), considered the main energy source of the heart. In this study, three experiments were conducted: (I) an in vivo study where salmon post-smolt were administrated dietary TTA in sea, (II) an in vitro study where isolated salmon heart cells were pre-stimulated with increasing doses of TTA and (III) an in vivo experiment where salmon post-smolt were subjected to injections with increasing doses of TTA...
January 19, 2018: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/29348870/n%C3%AE%C2%B5-carboxymethyl-lysine-promotes-calcium-deposition-in-vsmcs-via-intracellular-oxidative-stress-induced-pdk4-activation-and-alters-glucose-metabolism
#12
Wen-Qi Ma, Xi-Qiong Han, Ying Wang, Xin Wang, Yi Zhu, Nai-Feng Liu
Diabetes and vascular calcification are intrinsically linked. We previously reported that advanced glycation end products (AGEs) accelerate calcium deposition in vascular smooth muscle cells (VSMCs) via excessive oxidative stress. However, the underlying mechanism remains poorly understood. Pyruvate dehydrogenase kinase 4 (PDK4) is an important mitochondrial matrix enzyme in cellular energy metabolism. Since hyperactivation of PDK4 has been reported in calcified vessels and in patients with diabetes mellitus, inhibition of PDK4 expression may be a strategy for the prevention of diabetic vascular calcification...
December 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/29348256/flavonoids-dairy-foods-and-cardiovascular-and-metabolic-health-a-review-of-emerging-biologic-pathways
#13
REVIEW
Dariush Mozaffarian, Jason H Y Wu
A growing body of nutritional science highlights the complex mechanisms and pleiotropic pathways of cardiometabolic effects of different foods. Among these, some of the most exciting advances are occurring in the area of flavonoids, bioactive phytochemicals found in plant foods; and in the area of dairy, including milk, yogurt, and cheese. Many of the relevant ingredients and mechanistic pathways are now being clarified, shedding new light on both the ingredients and the pathways for how diet influences health and well-being...
January 19, 2018: Circulation Research
https://www.readbyqxmd.com/read/29346164/the-nuclear-receptor-nor-1-is-a-pleiotropic-regulator-of-exercise-induced-adaptations
#14
Michael A Pearen, George E O Muscat
Exercise induces various physical and metabolic changes in skeletal muscle that adaptively reprograms this tissue to current physiological and environmental demands. Underlying these changes are broad modifications to gene expression. We postulate that the nuclear hormone receptor, Nor-1, is activated following exercise and this transcription factor modifies gene expression to drive the molecular and cellular adaptations associated with contractile reorganization.
January 15, 2018: Exercise and Sport Sciences Reviews
https://www.readbyqxmd.com/read/29345251/cancer-associated-cachexia
#15
REVIEW
Vickie E Baracos, Lisa Martin, Murray Korc, Denis C Guttridge, Kenneth C H Fearon
Cancer-associated cachexia is a disorder characterized by loss of body weight with specific losses of skeletal muscle and adipose tissue. Cachexia is driven by a variable combination of reduced food intake and metabolic changes, including elevated energy expenditure, excess catabolism and inflammation. Cachexia is highly associated with cancers of the pancreas, oesophagus, stomach, lung, liver and bowel; this group of malignancies is responsible for half of all cancer deaths worldwide. Cachexia involves diverse mediators derived from the cancer cells and cells within the tumour microenvironment, including inflammatory and immune cells...
January 18, 2018: Nature Reviews. Disease Primers
https://www.readbyqxmd.com/read/29345195/mitochondrial-dysfunction-and-pulmonary-hypertension-cause-effect-or-both
#16
Jeffrey D Marshall, Isabel Bazan, Yi Zhang, Wassim H Fares, Patty J Lee
Pulmonary hypertension describes a heterogeneous disease defined by increased pulmonary artery pressures, and progressive increase in pulmonary vascular resistance due to pathologic remodeling of the pulmonary vasculature involving pulmonary endothelial cells, pericytes, and smooth muscle cells.  This process occurs under various conditions, and though these populations vary, the clinical manifestations are the same: progressive dyspnea, increases in right ventricular (RV) afterload and dysfunction, RV-pulmonary artery uncoupling, and right-sided heart failure with systemic circulatory collapse...
January 18, 2018: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/29345166/effects-of-coffee-components-on-muscle-glycogen-recovery-a-systematic-review
#17
Laís Monteiro Rodrigues Loureiro, Caio Eduardo Gonçalves Reis, Teresa Helena Macedo da Costa
Coffee is one of the most consumed beverages in the world and it can improve insulin sensitivity, stimulating glucose uptake in skeletal muscle when adequate carbohydrate intake is observed. The aim of this review is to analyze the effects of coffee and coffee components on muscle glycogen metabolism. A literature search was conducted according to PRISMA and seven studies were included. They explored the effects of coffee components on various substances and signaling proteins. In one of the studies with humans, caffeine was shown to increase glucose levels, Ca2+/calmodulin-dependent protein kinase (CaMK) phosphorylation, glycogen resynthesis rates and glycogen accumulation after exercise...
January 18, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29344670/pgc-1%C3%AE-ameliorates-kidney-fibrosis-in-mice-with-diabetic-kidney-disease-through-an-antioxidative-mechanism
#18
Liwen Zhang, Jian Liu, Fangfang Zhou, Weiming Wang, Nan Chen
The production of reactive oxygen species (ROS) is a common phenomenon in podocyte impairment, which leads to the irreversible progression of chronic kidney diseases, such as diabetic kidney disease (DKD). Previous research has indicated that peroxisome proliferator‑activated receptor γ (PPARγ) coactivator‑1α (PGC‑1α) participates in mitochondrial biogenesis and energy metabolism in certain mitochondria‑enriched cells, including myocardial and skeletal muscle cells. Therefore, we hypothesized that PGC‑1α may be a protective nuclear factor against energy and oxidative stress in DKD...
January 16, 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29344085/synthesis-secretion-function-metabolism-and-application-of-natriuretic-peptides-in-heart-failure
#19
REVIEW
Shihui Fu, Ping Ping, Fengqi Wang, Leiming Luo
As a family of hormones with pleiotropic effects, natriuretic peptide (NP) system includes atrial NP (ANP), B-type NP (BNP), C-type NP (CNP), dendroaspis NP and urodilatin, with NP receptor-A (guanylate cyclase-A), NP receptor-B (guanylate cyclase-B) and NP receptor-C (clearance receptor). These peptides are genetically distinct, but structurally and functionally related for regulating circulatory homeostasis in vertebrates. In humans, ANP and BNP are encoded by NP precursor A (NPPA) and NPPB genes on chromosome 1, whereas CNP is encoded by NPPC on chromosome 2...
2018: Journal of Biological Engineering
https://www.readbyqxmd.com/read/29344054/the-carnitine-status-does-not-affect-the-contractile-and-metabolic-phenotype-of-skeletal-muscle-in-pigs
#20
Daniel Kaup, Janine Keller, Erika Most, Joachim Geyer, Klaus Eder, Robert Ringseis
Background: Recently, supplementation of L-carnitine to obese rats was found to improve the carnitine status and to counteract an obesity-induced muscle fiber transition from type I to type II. However, it has not been resolved if the change of muscle fiber distribution induced in obese rats and the restoration of the "normal" muscle fiber distribution, which is found in lean rats, in obese rats by supplemental L-carnitine is causally linked with the carnitine status. In the present study we hypothesized that fiber type distribution in skeletal muscle is dependent on carnitine status...
2018: Nutrition & Metabolism
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