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Muscle skeletal research

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https://www.readbyqxmd.com/read/28220207/considerations-on-mtor-regulation-at-serine-2448-implications-for-muscle-metabolism-studies
#1
REVIEW
Vandré Casagrande Figueiredo, James F Markworth, David Cameron-Smith
The mammalian target of rapamycin (mTOR) complex exerts a pivotal role in protein anabolism and cell growth. Despite its importance, few studies adequately address the complexity of phosphorylation of the mTOR protein itself to enable conclusions to be drawn on the extent of kinase activation following this event. In particular, a large number of studies in the skeletal muscle biology field have measured Serine 2448 (Ser2448) phosphorylation as a proxy of mTOR kinase activity. However, the evidence to be described is that Ser2448 is not a measure of mTOR kinase activity nor is a target of AKT activity and instead has inhibitory effects on the kinase that is targeted by the downstream effector p70S6K in a negative feedback loop mechanism, which is evident when revisiting muscle research studies...
February 20, 2017: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/28207424/skeletal-muscle-wasting-new-role-of-nonclassical-renin-angiotensin-system
#2
Claudio Cabello-Verrugio, Juan C Rivera, Dominga Garcia
PURPOSE OF REVIEW: Skeletal muscle can be affected by many physiological and pathological conditions that contribute to the development of muscle weakness, including skeletal muscle loss, inflammatory processes, or fibrosis. Therefore, research into therapeutic treatment alternatives or alleviation of these effects on skeletal muscle is of great importance. RECENT FINDINGS: Recent studies have shown that angiotensin (1-7) [Ang-(1-7)] - a vasoactive peptide of the nonclassical axis in the renin-angiotensin system (RAS) - and its Mas receptor are expressed in skeletal muscle...
February 16, 2017: Current Opinion in Clinical Nutrition and Metabolic Care
https://www.readbyqxmd.com/read/28205203/effects-of-different-types-of-exercise-on-body-composition-muscle-strength-and-igf-1-in-the-elderly-with-sarcopenic-obesity
#3
Hung-Ting Chen, Yu-Chun Chung, Yu-Jen Chen, Sung-Yen Ho, Huey-June Wu
OBJECTIVES: To investigate the influence of resistance training (RT), aerobic training (AT), or combination training (CT) interventions on the body composition, muscle strength performance, and insulin-like growth factor 1 (IGF-1) of patients with sarcopenic obesity. DESIGN: Randomized controlled trial. SETTING: Community center and research center. PARTICIPANTS: Sixty men and women aged 65-75 with sarcopenic obesity...
February 15, 2017: Journal of the American Geriatrics Society
https://www.readbyqxmd.com/read/28198733/clinical-relevance-of-sarcopenia-in-chronic-kidney-disease
#4
Ranjani N Moorthi, Keith G Avin
PURPOSE OF REVIEW: In this article, we review sarcopenia in chronic kidney disease (CKD). We aim to present how definitions of sarcopenia from the general population may pertain to those with CKD, its assessment by clinicians and emerging therapies for sarcopenia in CKD. For this review, we limit our description and recommendations to patients with CKD who are not on dialysis. RECENT FINDINGS: Poorer parameters of lean mass, strength and physical function are associated with worsening patient-centered outcomes such as limiting mobility, falls and mortality in CKD; however, the magnitude of these associations are different in those with and without CKD...
February 13, 2017: Current Opinion in Nephrology and Hypertension
https://www.readbyqxmd.com/read/28197667/discovery-and-progress-of-direct-cardiac-reprogramming
#5
REVIEW
Hidenori Kojima, Masaki Ieda
Cardiac disease remains a major cause of death worldwide. Direct cardiac reprogramming has emerged as a promising approach for cardiac regenerative therapy. After the discovery of MyoD, a master regulator for skeletal muscle, other single cardiac reprogramming factors (master regulators) have been sought. Discovery of cardiac reprogramming factors was inspired by the finding that multiple, but not single, transcription factors were needed to generate induced pluripotent stem cells (iPSCs) from fibroblasts. We first reported a combination of cardiac-specific transcription factors, Gata4, Mef2c, and Tbx5 (GMT), that could convert mouse fibroblasts into cardiomyocyte-like cells, which were designated as induced cardiomyocyte-like cells (iCMs)...
February 14, 2017: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/28192790/systemic-pharmacologic-therapies-for-low-back-pain-a-systematic-review-for-an-american-college-of-physicians-clinical-practice-guideline
#6
Roger Chou, Richard Deyo, Janna Friedly, Andrea Skelly, Melissa Weimer, Rochelle Fu, Tracy Dana, Paul Kraegel, Jessica Griffin, Sara Grusing
Background: A 2007 American College of Physicians guideline addressed pharmacologic options for low back pain. New evidence and medications have now become available. Purpose: To review the current evidence on systemic pharmacologic therapies for acute or chronic nonradicular or radicular low back pain. Data Sources: Ovid MEDLINE (January 2008 through November 2016), Cochrane Central Register of Controlled Trials, Cochrane Database of Systematic Reviews, and reference lists...
February 14, 2017: Annals of Internal Medicine
https://www.readbyqxmd.com/read/28191538/lipodystrophy-hiv-related-and-fgf21-a-new-marker-to-follow-the-progression-of-lipodystrophy
#7
Stefano Benedini, Livio Luzi
Recently new evidence about fibroblast growth factor 21 (FGF21) highlights the opportunities to use this molecule in new pharmaceutical formulations to combat type 2 diabetes and metabolic syndrome. It is well known that HIV is per se a condition of insulin resistance and in particular the patient with HIV-related lipodystrophy has a condition strictly related to metabolic syndrome. Lipodystrophy is associated with severe metabolic side effects, including dyslipidemia, hepatic insulin resistance, and lipid oxidation impairment...
December 1, 2016: Journal of Translational Internal Medicine
https://www.readbyqxmd.com/read/28184235/phosphatidic-acid-biosynthesis-pharmacokinetics-mechanisms-of-action-and-effect-on-strength-and-body-composition-in-resistance-trained-individuals
#8
REVIEW
Peter Bond
The mechanistic target of rapamycin complex 1 (mTORC1) has received much attention in the field of exercise physiology as a master regulator of skeletal muscle hypertrophy. The multiprotein complex is regulated by various signals such as growth factors, energy status, amino acids and mechanical stimuli. Importantly, the glycerophospholipid phosphatidic acid (PA) appears to play an important role in mTORC1 activation by mechanical stimulation. PA has been shown to modulate mTOR activity by direct binding to its FKBP12-rapamycin binding domain...
2017: Nutrition & Metabolism
https://www.readbyqxmd.com/read/28177744/impact-of-hot-and-cold-exposure-on-human-skeletal-muscle-gene-expression
#9
Roksana B Zak, Robert J Shute, Matthew W S Heesch, D Taylor La Salle, Matthew P Bubak, Nicholas E Dinan, Terence L Laursen, Dustin Russel Slivka
: Many human diseases lead to a loss of skeletal muscle metabolic function and mass. Local and environmental temperature can modulate the exercise-stimulated response of several genes involved in mitochondrial biogenesis and skeletal muscle function in a human model. However, the impact of environmental temperature, independent of exercise, has not been addressed in a human model. Thus, the purpose of this study was to compare the effects of exposure to hot, cold, and room temperature conditions on skeletal muscle gene expression related to mitochondrial biogenesis and muscle mass...
December 1, 2016: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28177716/a-role-for-maternally-derived-myokines-to-optimize-placental-function-and-fetal-growth-across-gestation
#10
Chantal Dubé, Céline Aguer, Kristi Adamo, Shannon Bainbridge
Exercise during pregnancy is associated with improved health outcomes for both mother and baby, including a reduced risk of future obesity and susceptibility to chronic diseases. Overwhelming evidence demonstrates a protective effect of maternal exercise against fetal birth weight extremes, reducing the rates of both large- and small-for-gestational-age infants. It is speculated that this protective effect is mediated in part through exercise-induced regulation of maternal physiology and placental development/function...
January 17, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28170191/metabolomic-profiling-of-pompe-disease-induced-pluripotent-stem-cell-derived-cardiomyocytes-reveals-that-oxidative-stress-is-associated-with-cardiac-and-skeletal-muscle-pathology
#11
Yohei Sato, Hiroshi Kobayashi, Takashi Higuchi, Yohta Shimada, Hiroyuki Ida, Toya Ohashi
Pompe disease (PD) is a lysosomal storage disease that is caused by a deficiency of the acid α-glucosidase, which results in glycogen accumulation in the lysosome. The major clinical symptoms of PD include skeletal muscle weakness, respiratory failure, and cardiac hypertrophy. Based on its severity and symptom onset, PD is classified into infantile and late-onset forms. Lysosomal accumulation of glycogen can promote many types of cellular dysfunction, such as autophagic dysfunction, endoplasmic reticulum stress, and abnormal calcium signaling within skeletal muscle...
January 2017: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/28168870/annotation-of-functional-impact-of-voltage-gated-sodium-channel-mutations
#12
Valérie Hinard, Aurore Britan, Mathieu Schaeffer, Monique Zahn-Zabal, Urs Thomet, Jean-Sébastien Rougier, Amos Bairoch, Hugues Abriel, Pascale Gaudet
Voltage-gated sodium channels are pore-forming transmembrane proteins that selectively allow sodium ions to flow across the plasma membrane according to the electro-chemical gradient thus mediating the rising phase of action potentials in excitable cells and playing key roles in physiological processes such as neurotransmission, skeletal muscle contraction, heart rhythm and pain sensation. Genetic variations in the nine human genes encoding these channels are known to cause a large range of diseases affecting the nervous and cardiac systems...
February 7, 2017: Human Mutation
https://www.readbyqxmd.com/read/28167172/musicians-postural-quality-and-musculoskeletal-health-a-literature-s-review
#13
Patricia Blanco-Piñeiro, M Pino Díaz-Pereira, Aurora Martínez
OBJECTIVE: An analysis of the salient characteristics of research papers published between 1989 and 2015 that evaluate the relationship between postural quality during musical performance and various performance quality and health factors, with emphasis on musculoskeletal health variables. METHODS: Searches of Medline, Scopus and Google Scholar for papers that analysed the subject of the study objective. The following MeSH descriptors were used: posture; postural balance; muscle, skeletal; task performance and analysis; back; and spine and music...
January 2017: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/28165492/enhanced-development-of-skeletal-myotubes-from-porcine-induced-pluripotent-stem-cells
#14
Nicholas J Genovese, Timothy L Domeier, Bhanu Prakash V L Telugu, R Michael Roberts
The pig is recognized as a valuable model in biomedical research in addition to its agricultural importance. Here we describe a means for generating skeletal muscle efficiently from porcine induced pluripotent stem cells (piPSC) in vitro thereby providing a versatile platform for applications ranging from regenerative biology to the ex vivo cultivation of meat. The GSK3B inhibitor, CHIR99021 was employed to suppress apoptosis, elicit WNT signaling events and drive naïve-type piPSC along the mesoderm lineage, and, in combination with the DNA methylation inhibitor 5-aza-cytidine, to activate an early skeletal muscle transcription program...
February 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28161871/the-role-of-tgf%C3%AE-in-bone-muscle-crosstalk
#15
REVIEW
Jenna N Regan, Trupti Trivedi, Theresa A Guise, David L Waning
PURPOSE OF REVIEW: The role of bone-derived factors in regulation of skeletal muscle function is an important emerging aspect of research into bone-muscle crosstalk. Implications for this area of research are far reaching and include understanding skeletal muscle weakness in cancer, osteoporosis, cachexia, rare diseases of bone, and aging. RECENT FINDINGS: Recent research shows that bone-derived factors can lead to changes in the skeletal muscle. These changes can either be anabolic or catabolic, and we focus this review on the role of TGFβ in driving oxidative stress and skeletal muscle weakness in the setting of osteolytic cancer in the bone...
February 4, 2017: Current Osteoporosis Reports
https://www.readbyqxmd.com/read/28155812/human-muscle-precursor-cells-overexpressing-pgc-1%C3%AE-enhance-early-skeletal-muscle-tissue-formation
#16
Deana Haralampieva, Souzan Salemi, Ivana Dinulovic, Tullio Sulser, Simon M Ametamey, Christoph Handschin, Daniel Eberli
Muscle precursor cells (MPCs) are activated satellite cells capable of muscle fiber reconstruction. Therefore, autologous MPC transplantation is envisioned for the treatment of muscle diseases. However, the density of MPCs, as well as their proliferation and differentiation potential gradually decline with age. The goal of this research was to genetically modify human MPCs (hMPCs) to overexpress the peroxisome proliferator-activated receptor gamma coactivator (PGC-1α), a key regulator of exercise-mediated adaptation, and thereby to enhance early skeletal muscle formation and quality...
February 3, 2017: Cell Transplantation
https://www.readbyqxmd.com/read/28155183/sarcopenia-an-overview
#17
Emanuele Marzetti, Riccardo Calvani, Matteo Tosato, Matteo Cesari, Mauro Di Bari, Antonio Cherubini, Agnese Collamati, Emanuela D'Angelo, Marco Pahor, Roberto Bernabei, Francesco Landi
Sarcopenia, the age-dependent loss of muscle mass and function, is a common condition among older adults, and is associated with several adverse health outcomes. Owing to the impact of sarcopenia on quality of life, disability and mortality, a greater awareness is necessary in order to correctly identify the condition both in community and geriatric settings. Research on sarcopenia prevention and treatment is developing quickly, but many questions are still unanswered. The core of the sarcopenia condition involves quantitative and qualitative losses of skeletal muscle...
February 2, 2017: Aging Clinical and Experimental Research
https://www.readbyqxmd.com/read/28155179/the-need-of-operational-paradigms-for-frailty-in-older-persons-the-sprintt-project
#18
Matteo Cesari, Emanuele Marzetti, Riccardo Calvani, Bruno Vellas, Roberto Bernabei, Philippe Bordes, Ronenn Roubenoff, Francesco Landi, Antonio Cherubini
The exploration of frailty as a pre-disability geriatric condition represents one of the most promising research arenas of modern medicine. Frailty is today indicated as a paradigmatic condition around which the traditional healthcare systems might be re-shaped and optimized in order to address the complexities and peculiarities of elders. Unfortunately, the lack of consensus around a single operational definition has limited the clinical implementation of frailty in clinical practice. In these last years, growing attention (even beyond the traditional boundaries of geriatric medicine) has been given to physical performance measures...
February 2, 2017: Aging Clinical and Experimental Research
https://www.readbyqxmd.com/read/28152667/synthesis-and-characterization-of-electroactive-gellan-gum-spongy-like-hydrogels-for-skeletal-muscle-tissue-engineering-applications
#19
Fernanda V Berti, Pathomthat Srisuk, Lucilia da Silva, Alexandra P Marques, Rui L Reis, Vitor Manuel Correlo
Advances on materials' research for tissue engineering applications have shown that cells respond directly to physical, chemical, mechanical and electrical stimuli altering a variety of signaling cascades which consequently result in phenotypic and genotypic alterations. Gellan gum (GG) spongy-like hydrogels (SLH) open microstructure, mechanical properties, and cell performance have shown promising results for soft tissue engineering applications. Taking advantage of GG-SLH intrinsic properties and polypyrrole (PPy) electroactivity, we developed electroactive PPy-GG spongy-like hydrogels envisaging their potential use for skeletal muscle tissue engineering...
February 3, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28150539/current-best-practice-in-rehabilitation-in-interstitial-lung-disease
#20
Atsuhito Nakazawa, Narelle S Cox, Anne E Holland
Interstitial lung disease (ILD) is a group of chronic respiratory diseases characterized by dyspnoea on exertion and decline in health-related quality of life (HRQL). People with ILD experience significant exercise limitation with contributors that include ventilatory limitation, impaired gas exchange, decreased cardiac function and skeletal muscle dysfunction. Pulmonary rehabilitation (PR) is well established in patients with chronic obstructive pulmonary disease (COPD) as a means to overcome exercise limitation and improve activity-related dyspnoea...
February 2017: Therapeutic Advances in Respiratory Disease
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