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Muscle skeletal research

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https://www.readbyqxmd.com/read/28646812/oral-consumption-of-vitamin-k2-for-8-weeks-associated-with-increased-maximal-cardiac-output-during-exercise
#1
Brian K McFarlin, Andrea L Henning, Adam S Venable
Background • Vitamin K1 and K2 are not typically common in a Western diet because they are found in a variety of fermented foods. Vitamin K2 in particular has been demonstrated to restore mitochondrial function and has a key role in production of mitochondrial adenosine triphosphate. Thus, it is reasonable to speculate that dietary supplementation with vitamin K2 could increase the function of muscle with high mitochondrial content (ie, skeletal and cardiac muscle). Objective • The purpose of this study was to determine if 8 wk of dietary supplementation with Vitamin K2 could alter cardiovascular responses to a graded cycle ergometer test...
July 2017: Alternative Therapies in Health and Medicine
https://www.readbyqxmd.com/read/28638928/-fat-deposition-in-skeletal-muscle-and-its-regulation
#2
Li-Fang Zheng, Pei-Jie Chen, Yong-Zhan Zhou, Wei-Hua Xiao
Under normal condition, there are a few lipid droplets in skeletal muscle. But in skeletal muscle acute injury, muscular dystrophy, muscle atrophy, obesity, diabetes and other pathological conditions, the fat deposition in skeletal muscle increases, which implicate that the fat deposition may play an important role in the pathogenesis of these diseases. However, the mechanisms of development and regulation of fat deposition in skeletal muscle are not clear. Clarifying the key signaling pathways and regulatory factors that affect fat deposition in skeletal muscle, and exploring new ways to improve the fat deposition in skeletal muscle will not only help to deepen our understanding of the pathogenesis of these diseases, but also provide new ideas for the treatment of these diseases...
June 25, 2017: Sheng Li Xue Bao: [Acta Physiologica Sinica]
https://www.readbyqxmd.com/read/28633035/economy-and-endurance-in-human-evolution
#3
REVIEW
Herman Pontzer
The evolutionary pressures shaping humans' unique bipedal locomotion have been a focus of research since Darwin, but the origins of humans' economical walking gait and endurance running capabilities remain unclear. Here, I review the anatomical and physiological determinants of locomotor economy (e.g., limb length and posture) and endurance (e.g., muscle volume and fiber type) and investigate their development in the hominin fossil record. The earliest hominins were bipedal but retained ape-like features in the hind limb that would have limited their walking economy compared to living humans...
June 19, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28629737/the-obligatory-role-of-activin-a-in-the-formation-of-heterotopic-bone-in-fibrodysplasia-ossificans-progressiva
#4
Dana M Alessi Wolken, Vincent Idone, Sarah J Hatsell, Paul B Yu, Aris N Economides
Fibrodysplasia Ossificans Progressiva (FOP) is a rare genetic disorder that presents at birth with only minor patterning defects, but manifests its debilitating pathology early in life with episodic, yet progressive and cumulative, heterotopic ossification (HO) of ligaments, tendons, and a subset of major skeletal muscles. The resulting HO lesions are endochondral in nature, and appear to be linked to inflammatory stimuli arising in association with known injuries, or from inflammation linked to normal tissue repair...
June 16, 2017: Bone
https://www.readbyqxmd.com/read/28620318/extraction-protocols-for-individual-zebrafish-s-ventricle-myosin-and-skeletal-muscle-actin-for-in-vitro-motility-assays
#5
Lisa-Mareike Scheid, Cornelia Weber, Nasrin Bopp, Matias Mosqueira, Rainer H A Fink
The in vitro motility assay (IVMA) is a technique that enables the measurement of the interaction between actin and myosin providing a relatively simple model to understand the mechanical muscle function. For actin-myosin IVMA, myosin is immobilized in a measurement chamber, where it converts chemical energy provided by ATP hydrolysis into mechanical energy. The result is the movement of fluorescently labeled actin filaments that can be recorded microscopically and analyzed quantitatively. Resulting sliding speeds and patterns help to characterize the underlying actin-myosin interaction that can be affected by different factors such as mutations or active compounds...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28618190/relation-between-upper-limb-muscle-strength-with-exercise-capacity-quality-of-life-and-dyspnea-in-patients-with-severe-chronic-obstructive-pulmonary-disease
#6
Dicle Kaymaz, İpek Çaylı Candemir, Pınar Ergün, Neşe Demir, Filiz Taşdemir, Pervin Demir
INTRODUCTION: In chronic obstructive pulmonary disease (COPD), skeletal muscle weakness is characterized by reduced muscle strength, reduced muscle endurance and the presence of muscle fatigue especially in lower limbs. There has been little research into the upper limb skeletal muscles. OBJECTIVES: In this study, we aimed to investigate the relation of upper limb muscle strength with pulmonary function, exercise capacity, quality of life (QoL) and dyspnea sensation...
June 15, 2017: Clinical Respiratory Journal
https://www.readbyqxmd.com/read/28616806/ipragliflozin-reduces-epicardial-fat-accumulation-in-non-obese-type-2-diabetic-patients-with-visceral-obesity-a-pilot-study
#7
Tatsuya Fukuda, Ryotaro Bouchi, Masahiro Terashima, Yuriko Sasahara, Masahiro Asakawa, Takato Takeuchi, Yujiro Nakano, Masanori Murakami, Isao Minami, Hajime Izumiyama, Koshi Hashimoto, Takanobu Yoshimoto, Yoshihiro Ogawa
INTRODUCTION: Epicardial fat (EF) was reported to be independently associated with cardiovascular disease regardless of obesity. We have previously reported that a sodium-glucose co-transporter-2 (SGLT2) inhibitor, luseogliflozin, reduces the EF volume (EFV) in parallel with the reduction of body weight in obese patients (BMI ≥25 kg/m(2)) with type 2 diabetes. However, it is unknown whether SGLT2 inhibitors could reduce EFV in non-obese patients (BMI <25 kg/m(2)) with type 2 diabetes...
June 14, 2017: Diabetes Therapy: Research, Treatment and Education of Diabetes and related Disorders
https://www.readbyqxmd.com/read/28614178/patterns-of-opioid-use-and-risk-of-opioid-overdose-death-among-medicaid-patients
#8
Renu K Garg, Deborah Fulton-Kehoe, Gary M Franklin
BACKGROUND: The Centers for Disease Control and Prevention recognizes Medicaid as a high-risk population for fatal opioid overdose. Further research is needed to identify factors that put Medicaid patients at increased risk. OBJECTIVE: To determine whether patterns of opioid use are associated with risk of opioid-related mortality among opioid users. DESIGN: This is a retrospective cohort study. PATIENTS: In total, 150,821 noncancer pain patients aged 18-64 years with ≥1 opioid prescription, April 2006 to December 2010, Washington Medicaid...
July 2017: Medical Care
https://www.readbyqxmd.com/read/28595536/neuroprotective-effects-of-drug-induced-therapeutic-hypothermia-in-central-nervous-system-diseases
#9
Junwei Ma, Yibin Wang, Zhong Wang, Haiying Li, Zhimin Wang, Gang Chen
Cerebrovascular diseases often cause neurological deficits. Experimental studies have shown that drug-induced hypothermia alleviates brain damage and plays a neuroprotective role, thereby reducing mortality and ameliorating neurological deficits. Therefore, drug-induced hypothermia has an important research value and is further considered in the clinical setting. However, drug-induced hypothermia is also associated with side effects, such as ventricular tachycardia, ventricular fibrillation, suppressed immune function, infection, electrolyte imbalance, glucose metabolism disorders, and skeletal muscle tremor...
June 6, 2017: Current Drug Targets
https://www.readbyqxmd.com/read/28595527/creatine-supplementation-and-skeletal-muscle-metabolism-for-building-muscle-mass-review-of-the-potential-mechanisms-of-action
#10
Farnaz Farshidfar, Mark A Pinder, Semone B Myrie
Creatine, a very popular supplement among athletic populations, is of growing interest for clinical applications. Since over 90% of creatine is stored in skeletal muscle, the effect of creatine supplementation on muscle metabolism is a widely studied area. While numerous studies over the past few decades have shown that creatine supplementation has many favorable effects on skeletal muscle physiology and metabolism, including enhancing muscle mass (growth/hypertrophy); the underlying mechanisms are poorly understood...
June 5, 2017: Current Protein & Peptide Science
https://www.readbyqxmd.com/read/28595526/sarcopenia-an-overview-on-current-definitions-diagnosis-and-treatment
#11
Francesco Landi, Riccardo Calvani, Matteo Cesari, Matteo Tosato, Anna Maria Martone, Elena Ortolani, Giulia Savera, Sara Salini, Alex N Sisto, Anna Picca, Emanuele Marzetti
Sarcopenia, the progressive and generalized loss of skeletal muscle mass and strength/function associated with aging, increases the risk of a vast array of adverse health outcomes, including falls, morbidity, loss of independence, disability, and mortality. As such, sarcopenia poses a huge socioeconomic burden in developed countries. The development and implementation of effective interventions against sarcopenia is therefore a public health priority. A preliminary, fundamental step in such a process entails the agreement of researchers, healthcare professionals and policy-makers around a unique operational definition of sarcopenia...
June 6, 2017: Current Protein & Peptide Science
https://www.readbyqxmd.com/read/28587082/natural-products-as-alternative-choices-for-p-glycoprotein-p-gp-inhibition
#12
REVIEW
Saikat Dewanjee, Tarun K Dua, Niloy Bhattacharjee, Anup Das, Moumita Gangopadhyay, Ritu Khanra, Swarnalata Joardar, Muhammad Riaz, Vincenzo De Feo, Muhammad Zia-Ul-Haq
Multidrug resistance (MDR) is regarded as one of the bottlenecks of successful clinical treatment for numerous chemotherapeutic agents. Multiple key regulators are alleged to be responsible for MDR and making the treatment regimens ineffective. In this review, we discuss MDR in relation to P-glycoprotein (P-gp) and its down-regulation by natural bioactive molecules. P-gp, a unique ATP-dependent membrane transport protein, is one of those key regulators which are present in the lining of the colon, endothelial cells of the blood brain barrier (BBB), bile duct, adrenal gland, kidney tubules, small intestine, pancreatic ducts and in many other tissues like heart, lungs, spleen, skeletal muscles, etc...
May 25, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28580427/incidental-finding-of-low-brown-adipose-tissue-activity-in-endurance-trained-individuals-methodological-considerations-for-positron-emission-tomography
#13
Eric T Trexler, Drew McCallister, Abbie E Smith-Ryan, Rosa T Branca
Brown adipose tissue (BAT) in adults has been shown to have a meaningful impact on energy expenditure and cold-induced thermogenesis. Data from rodent research have suggested that exercise may be a promising method of increasing BAT activity, with potential applications to the treatment and prevention of obesity and diabetes. However, emerging human research using positron emission tomography (PET) with [18F] Fluorodeoxyglucose (FDG) has identified lower BAT activity in endurance-trained athletes compared to sedentary controls, despite similar metabolic rate responses to cold exposure...
March 2017: Journal of Nature and Science
https://www.readbyqxmd.com/read/28575165/genome-wide-profiling-of-sus-scrofa-circular-rnas-across-nine-organs-and-three-developmental-stages
#14
Guoming Liang, Yalan Yang, Guanglin Niu, Zhonglin Tang, Kui Li
The spatio-temporal expression patterns of Circular RNA (circRNA) across organs and developmental stages are critical for its function and evolution analysis. However, they remain largely unclear in mammals. Here, we comprehensively analysed circRNAs in nine organs and three skeletal muscles of Guizhou miniature pig (S. scrofa), a widely used biomedical model animal. We identified 5,934 circRNAs and analysed their molecular properties, sequence conservation, spatio-temporal expression pattern, potential function, and interaction with miRNAs...
May 29, 2017: DNA Research: An International Journal for Rapid Publication of Reports on Genes and Genomes
https://www.readbyqxmd.com/read/28570949/does-hypoxia-play-a-role-in-the-development-of-sarcopenia-in-humans-mechanistic-insights-from-the-caudwell-xtreme-everest-expedition
#15
Liesl Wandrag, Mario Siervo, Heather L Riley, Maryam Khosravi, Bernadette O Fernandez, Carl A Leckstrom, Daniel S Martin, Kay Mitchell, Denny Z H Levett, Hugh E Montgomery, Monty G Mythen, Michael A Stroud, Michael P W Grocott, Martin Feelisch
OBJECTIVES: Sarcopenia refers to the involuntary loss of skeletal muscle and is a predictor of physical disability/mortality. Its pathogenesis is poorly understood, although roles for altered hypoxic signaling, oxidative stress, adipokines and inflammatory mediators have been suggested. Sarcopenia also occurs upon exposure to the hypoxia of high altitude. Using data from the Caudwell Xtreme Everest expedition we therefore sought to analyze the extent of hypoxia-induced body composition changes and identify putative pathways associated with fat-free mass (FFM) and fat mass (FM) loss...
May 8, 2017: Redox Biology
https://www.readbyqxmd.com/read/28569257/current-status-and-future-prospect-of-fshd-region-gene-1
#16
Arman Kunwar Hansda, Ankit Tiwari, Manjusha Dixit
FSHD region gene 1 (FRG1), as the name suggests, is the primary candidate gene for fascioscapulohumeral muscular dystrophy disease. It seemingly affects muscle physiology in normal individuals but in FSHD, where it is found to be highly upregulated, might be involved in disruption of face, scapula and humeral skeletal muscle. Literature on FRG1, reviewed from 1996 to 2016, reveals that it is primarily associated with muscle development and maintenance. Approximately 75% of FSHD patients also show vascular abnormalities indicating that FRG1 might have some part to play in these abnormalities...
June 2017: Journal of Biosciences
https://www.readbyqxmd.com/read/28559437/fibroblast-growth-factor-21-a-regulator-of-metabolic-disease-and-health-span
#17
Ting Xie, Po Sing Leung
Fibroblast growth factor 21 (FGF21) is a potent endocrine regulator with physiological effects on glucose and lipid metabolism and thus garners much attention on its translational potential for the management of obesity and related metabolic syndromes. FGF21 is mainly expressed in several metabolically active tissue organs, such as the liver, adipose tissue, skeletal muscle and pancreas with profound effects and therapeutically relevance. Emerging experimental and clinical data point to the demonstrated metabolic benefits of FGF21 which includes, but not limit to, weight loss, glucose and lipid metabolism as well as insulin sensitivity...
May 30, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28558935/local-muscle-cooling-does-not-impact-expression-of-mitochondrial-related-genes
#18
Robert Shute, Matthew Heesch, Terence Laursen, Dustin Slivka
Recovery that takes place in a cold environment after endurance exercise elevates PGC-1α mRNA whereas ERRα and NRF2 mRNA expression are inhibited. However, the effect of local skeletal muscle cooling on mitochondrial-related gene expression is unknown. PURPOSE: To determine the impact of local skeletal muscle cooling during recovery from an acute bout of exercise on mitochondrial-related gene expression. METHODS: Recreationally-trained male cyclists (n=8, age 25±3 y, height 181±6cm, weight 79±8kg, 12...
July 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/28557061/classification-of-involuntary-movements-in-dogs-myoclonus-and-myotonia
#19
REVIEW
M Lowrie, L Garosi
Myoclonus is a sudden brief, involuntary muscle jerk. Of all the movement disorders, myoclonus is the most difficult to encapsulate into any simple framework. On the one hand, a classification system is required that is clinically useful to aid in guiding diagnosis and treatment. On the other hand, there is need for a system that organizes current knowledge regarding biological mechanisms to guide scientific research. These 2 needs are distinct, making it challenging to develop a robust classification system suitable for all purposes...
May 30, 2017: Journal of Veterinary Internal Medicine
https://www.readbyqxmd.com/read/28556909/altered-postcapillary-and-collecting-venular-reactivity-in-skeletal-muscle-with-metabolic-syndrome
#20
Kent A Lemaster, Zahra Farid, Robert W Brock, Carl D Shrader, Daniel Goldman, Dwayne N Jackson, Jefferson C Frisbee
While research into vascular outcomes of the metabolic syndrome has focused on arterial/arteriolar and capillary levels, investigation into venular function and how this impacts responses has received little attention. Using the in situ cremaster muscle of obese Zucker rats (OZR; with leans (LZR) as controls), we determined indices of venular function. At ∼17 weeks of age, skeletal muscle post-capillary venular density was reduced by ∼20% in LZR vs. OZR, although there was no evidence of remodeling of the venular wall...
May 30, 2017: Journal of Physiology
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