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https://www.readbyqxmd.com/read/29781176/autophagy-and-mitophagy-flux-in-young-and-aged-skeletal-muscle-following-chronic-contractile-activity
#1
Heather N Carter, Yuho Kim, Avi T Erlich, Dorrin Zarrin-Khat, David A Hood
Skeletal muscle exhibits deficits in mitochondrial quality with age. Central to the maintenance of a healthy mitochondrial pool is the removal of dysfunctional organelles via mitophagy. Little is known on how mitophagy is altered with aging and chronic exercise. We assessed mitophagy flux using colchicine treatment in vivo following chronic contractile activity (CCA) of muscle in young and aged rats. CCA evoked mitochondrial biogenesis in young muscle, with an attenuated response in aged muscle. Mitophagy flux was higher in aged muscle and was correlated with the enhanced expression of mitophagy receptors and upstream transcriptional regulators...
May 20, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29774118/proteomic-profiling-of-skeletal-and-cardiac-muscle-in-cancer-cachexia-alterations-in-sarcomeric-and-mitochondrial-protein-expression
#2
Angie M Y Shum, Anne Poljak, Nicholas L Bentley, Nigel Turner, Timothy C Tan, Patsie Polly
Background: Cancer cachexia is observed in more than 50% of advanced cancer patients, and impairs quality of life and prognosis. A variety of pathways are likely to be dysregulated. Hence, a broad-spectrum understanding of the disease process is best achieved by a discovery based approach such as proteomics. Results: More than 300 proteins were identified with > 95% confidence in correct sequence identification, of which 5-10% were significantly differentially expressed in cachectic tissues ( p -value of 0...
April 24, 2018: Oncotarget
https://www.readbyqxmd.com/read/29764991/a-dgk%C3%AE-foxo-ubiquitin-proteolytic-axis-controls-fiber-size-during-skeletal-muscle-remodeling
#3
Jae-Sung You, Matthew S Dooley, Chan-Ran Kim, Eui-Jun Kim, Wei Xu, Craig A Goodman, Troy A Hornberger
Skeletal muscle rapidly remodels in response to various stresses, and the resulting changes in muscle mass profoundly influence our health and quality of life. We identified a diacylglycerol kinase ζ (DGKζ)-mediated pathway that regulated muscle mass during remodeling. During mechanical overload, DGKζ abundance was increased and required for effective hypertrophy. DGKζ not only augmented anabolic responses but also suppressed ubiquitin-proteasome system (UPS)-dependent proteolysis. We found that DGKζ inhibited the transcription factor FoxO that promotes the induction of the UPS...
May 15, 2018: Science Signaling
https://www.readbyqxmd.com/read/29761898/clinical-impact-of-muscle-quantity-and-quality-in-colorectal-cancer-patients-a-propensity-score-matching-analysis
#4
Yoshinaga Okugawa, Yuji Toiyama, Akira Yamamoto, Tsunehiko Shigemori, Chengzeng Yin, Aya Narumi, Yusuke Omura, Shozo Ide, Takahito Kitajima, Hiroyuki Fujikawa, Hiromi Yasuda, Junichiro Hiro, Shigeyuki Yoshiyama, Minako Kobayashi, Toshimitsu Araki, Donald C McMillan, Chikao Miki, Masato Kusunoki
BACKGROUND: Sarcopenia is defined as the loss of skeletal muscle mass, accompanied by decreased muscle strength, and consists of myopenia and myosteatosis. Recent evidence has suggested the predictive value of sarcopenia for the risk of perioperative and oncological outcomes in various malignancies. The aim of this study was to clarify the clinical impact of myopenia and myosteatosis in colorectal cancer (CRC) patients. METHODS: We analyzed the preoperative psoas muscle mass index and intramuscular adipose tissue content using preoperative computed tomography images from 308 CRC patients using statistical methods...
May 15, 2018: JPEN. Journal of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/29760914/gas-stunning-with-co-2-affected-meat-color-lipid-peroxidation-oxidative-stress-and-gene-expression-of-mitogen-activated-protein-kinases-glutathione-s-transferases-and-cu-zn-superoxide-dismutase-in-the-skeletal-muscles-of-broilers
#5
Lei Xu, Haijun Zhang, Hongyuan Yue, Shugeng Wu, Haiming Yang, Zhiyue Wang, Guanghai Qi
Background: Meat color and lipid peroxidation are important traits related to meat quality. CO2 concentration is a critical factor that can affect meat quality in the commercial use of gas stunning (GS). However, the effect and mechanism of CO2 stunning on meat color and lipid peroxidation during long-term storage remain poorly studied. We aimed to study the effects of GS methods, especially CO2 concentration, on meat color and meat lipid peroxidation in broilers during long-term storage at 4 °C and to explore the potential mechanism of meat color change via lipid peroxidation and the inner lipid peroxide scavenging system...
2018: Journal of Animal Science and Biotechnology
https://www.readbyqxmd.com/read/29746477/an-overview-of-technical-considerations-when-using-quantitative-real-time-pcr-analysis-of-gene-expression-in-human-exercise-research
#6
Jujiao Kuang, Xu Yan, Amanda J Genders, Cesare Granata, David J Bishop
Gene expression analysis by quantitative PCR in skeletal muscle is routine in exercise studies. The reproducibility and reliability of the data fundamentally depend on how the experiments are performed and interpreted. Despite the popularity of the assay, there is a considerable variation in experimental protocols and data analyses from different laboratories, and there is a lack of consistency of proper quality control steps throughout the assay. In this study, we present a number of experiments on various steps of quantitative PCR workflow, and demonstrate how to perform a quantitative PCR experiment with human skeletal muscle samples in an exercise study...
2018: PloS One
https://www.readbyqxmd.com/read/29732211/efficacy-of-sertraline-and-gabapentin-in-the-treatment-of-urethral-pain-syndrome-retrospective-results-of-a-single-institutional-cohort
#7
Özer Ural Cakici, Nurullah Hamidi, Emre Ürer, Emrah Okulu, Onder Kayigil
Introduction: Urethral pain syndrome is a subgroup of chronic pelvic pain syndromes and comprises a relatively challenging patient group in urological practice. Several different treatments have been used for the management of the condition from a mostly empirical basis. In this article, we present the results of a small cohort of young male patients treated with sertraline and gabapentin therapy. Material and methods: The data of 52 patients was retrospectively evaluated and 31 patients' data was included in this study...
2018: Central European Journal of Urology
https://www.readbyqxmd.com/read/29720700/in-silico-assessment-of-the-conduction-mechanism-of-the-ryanodine-receptor-1-reveals-previously-unknown-exit-pathways
#8
Leonard P Heinz, Wojciech Kopec, Bert L de Groot, Rainer H A Fink
The ryanodine receptor 1 is a large calcium ion channel found in mammalian skeletal muscle. The ion channel gained a lot of attention recently, after multiple independent authors published near-atomic cryo electron microscopy data. Taking advantage of the unprecedented quality of structural data, we performed molecular dynamics simulations on the entire ion channel as well as on a reduced model. We calculated potentials of mean force for Ba2+ , Ca2+ , Mg2+ , K+ , Na+ and Cl- ions using umbrella sampling to identify the key residues involved in ion permeation...
May 2, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29719250/mitophagy-directs-muscle-adipose-crosstalk-to-alleviate-dietary-obesity
#9
Tingting Fu, Zhisheng Xu, Lin Liu, Qiqi Guo, Hao Wu, Xijun Liang, Danxia Zhou, Liwei Xiao, Lei Liu, Yong Liu, Min-Sheng Zhu, Quan Chen, Zhenji Gan
The quality of mitochondria in skeletal muscle is essential for maintaining metabolic homeostasis during adaptive stress responses. However, the precise control mechanism of muscle mitochondrial quality and its physiological impacts remain unclear. Here, we demonstrate that FUNDC1, a mediator of mitophagy, plays a critical role in controlling muscle mitochondrial quality as well as metabolic homeostasis. Skeletal-muscle-specific ablation of FUNDC1 in mice resulted in LC3-mediated mitophagy defect, leading to impaired mitochondrial energetics...
May 1, 2018: Cell Reports
https://www.readbyqxmd.com/read/29701769/fetal-origins-of-impaired-muscle-growth-and-metabolic-dysfunction-lessons-from-the-heat-stressed-pregnant-ewe
#10
D T Yates, J L Petersen, T B Schmidt, C N Cadaret, T B Barnes, R J Posont, K A Beede
Intrauterine growth restriction (IUGR) is the second leading cause of perinatal mortality and predisposes offspring to metabolic disorders at all stages of life. Muscle-centric fetal adaptations reduce growth and yield metabolic parsimony, beneficial for IUGR fetal survival but detrimental to metabolic health after birth. Epidemiological studies have reported that IUGR-born children experience greater prevalence of insulin resistance and obesity, which progresses to diabetes, hypertension, and other metabolic disorders in adulthood that reduce quality of life...
April 26, 2018: Journal of Animal Science
https://www.readbyqxmd.com/read/29691621/clinical-impact-of-preoperative-sarcopenia-on-the-postoperative-outcomes-after-pancreas-transplantation
#11
Yasunari Fukuda, Tadafumi Asaoka, Hidetoshi Eguchi, Kazuki Sasaki, Yoshifumi Iwagami, Daisaku Yamada, Takehiro Noda, Koichi Kawamoto, Kunihito Gotoh, Shogo Kobayashi, Toshinori Ito, Yutaka Takeda, Masahiro Tanemura, Masaki Mori, Yuichiro Doki
BACKGROUND: The importance of evaluating sarcopenia is increasingly being recognized in the field of transplantation because sarcopenia can have an adverse effect on the treatment outcomes. However, the clinical significance of preoperative sarcopenia on the postoperative outcomes following pancreas transplantation (PTx) has been largely unknown. The objective of this study was to investigate the role of preoperative sarcopenia in predicting the postoperative outcomes following PTx in recipients with type 1 diabetes mellitus (T1D)...
April 24, 2018: World Journal of Surgery
https://www.readbyqxmd.com/read/29687267/muscle-quality-characteristics-of-muscles-in-the-thigh-upper-arm-and-lower-back-in-elderly-men-and-women
#12
Akito Yoshiko, Takashi Kaji, Hiroki Sugiyama, Teruhiko Koike, Yoshiharu Oshida, Hiroshi Akima
PURPOSE: The ratio of fat within skeletal muscle is an important parameter that is indicative of muscle quality, and can be assessed using ultrasonography to measure echo intensity (EI). Muscle EI indicates muscle strength and risk of physical dysfunction; however, this observation was determined following examinations of only selected muscle. The purpose of this study was to investigate the EI characteristics of muscles in several regions in elderly men and women, using physical function tests and serum cholesterol levels...
April 23, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29686822/exciting-perspectives-for-translational-myology-in-the-abstracts-of-the-2018spring-paduamuscledays-giovanni-salviati-memorial-chapter-i-foreword
#13
Ugo Carraro
Myologists working in Padua (Italy) were able to continue a half-century tradition of studies of skeletal muscles, that started with a research on fever, specifically if and how skeletal muscle contribute to it by burning bacterial toxin. Beside main publications in high-impact-factor journals by Padua myologists, I hope to convince readers (and myself) of the relevance of the editing Basic and Applied Myology (BAM), retitled from 2010 European Journal of Translational Myology (EJTM), of the institution of the Interdepartmental Research Center of Myology of the University of Padova (CIR-Myo), and of a long series of International Conferences organized in Euganei Hills and Padova, that is, the PaduaMuscleDays...
January 12, 2018: European Journal of Translational Myology
https://www.readbyqxmd.com/read/29685545/improvement-of-reliability-of-diffusion-tensor-metrics-in-thigh-skeletal-muscles
#14
Sarah Keller, Avneesh Chhabra, Shaheen Ahmed, Anne C Kim, Jonathan M Chia, Jin Yamamura, Zhiyue J Wang
OBJECTIVE: Quantitative diffusion tensor imaging (DTI) of skeletal muscles is challenging due to the bias in DTI metrics, such as fractional anisotropy (FA) and mean diffusivity (MD), related to insufficient signal-to-noise ratio (SNR). This study compares the bias of DTI metrics in skeletal muscles via pixel-based and region-of-interest (ROI)-based analysis. METHODS: DTI of the thigh muscles was conducted on a 3.0-T system in N = 11 volunteers using a fat-suppressed single-shot spin-echo echo planar imaging (SS SE-EPI) sequence with eight repetitions (number of signal averages (NSA) = 4 or 8 for each repeat)...
May 2018: European Journal of Radiology
https://www.readbyqxmd.com/read/29682760/protective-role-of-parkin-in-skeletal-muscle-contractile-and-mitochondrial-function
#15
Gilles Gouspillou, Richard Godin, Jérome Piquereau, Martin Picard, Mahroo Mofarrahi, Jasmin Mathew, Fennigje M Purves-Smith, Nicolas Sgarioto, Russell T Hepple, Yan Burelle, Sabah Na Hussain
KEY POINTS SUMMARY: Parkin, an E3 ubiquitin ligase encoded by the Park2 gene, has been implicated in the regulation of mitophagy, a quality control process whereby defective mitochondria are degraded. The exact physiological significance of Parkin in regulating mitochondrial function and contractility in skeletal muscle remains largely unexplored. Using Park2-/- mice, we show that Parkin ablation causes a decrease in muscle specific force, a severe decrease in mitochondrial respiration, mitochondrial uncoupling and an increased susceptibility to opening of the permeability transition pore...
April 22, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29682162/metabolic-alterations-in-a-slow-paced-model-of-pancreatic-cancer-induced-wasting
#16
Elisabeth Wyart, Simone Reano, Myriam Y Hsu, Dario Livio Longo, Mingchuan Li, Emilio Hirsch, Nicoletta Filigheddu, Alessandra Ghigo, Chiara Riganti, Paolo Ettore Porporato
Cancer cachexia is a devastating syndrome occurring in the majority of terminally ill cancer patients. Notably, skeletal muscle atrophy is a consistent feature affecting the quality of life and prognosis. To date, limited therapeutic options are available, and research in the field is hampered by the lack of satisfactory models to study the complexity of wasting in cachexia-inducing tumors, such as pancreatic cancer. Moreover, currently used in vivo models are characterized by an explosive cachexia with a lethal wasting within few days, while pancreatic cancer patients might experience alterations long before the onset of overt wasting...
2018: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/29673501/association-of-sarcopenia-with-nutritional-parameters-quality-of-life-hospitalization-and-mortality-rates-of-elderly-patients-on-hemodialysis
#17
Juliana Giglio, Maria Ayako Kamimura, Fernando Lamarca, Juliana Rodrigues, Fernanda Santin, Carla Maria Avesani
OBJECTIVE: This study aimed to assess whether diminished muscle mass, diminished muscle strength, or both conditions (sarcopenia) are associated with worse nutritional status, poor quality of life (QoL), and hard outcomes, such as hospitalization and mortality, in elderly patients on maintenance hemodialysis (MHD). DESIGN AND SUBJECTS: This is a multicenter observational longitudinal study that included 170 patients on MHD (age 70 ± 7 years, 65% male) from 6 dialysis centers...
May 2018: Journal of Renal Nutrition
https://www.readbyqxmd.com/read/29669697/the-prevalence-of-sarcopaenia-in-a-vascular-surgical-patient-cohort-and-its-impact-on-outcome
#18
Rachel Heard, Douglas Black, George Ramsay, Neil Scott, Diane Hildebrand
BACKGROUND: Sarcopaenia, loss of lean muscle mass and quality, has prognostic significance and can be used to guide the management of oncology patients.1 However, there is limited research into the prevalence and effect of sarcopaenia in vascular populations. We aim to investigate the prevalence of this measure of physiological reserve in a vascular patient group. METHODS: All patients admitted to a tertiary vascular unit in a single year were considered for the study...
April 16, 2018: Surgeon: Journal of the Royal Colleges of Surgeons of Edinburgh and Ireland
https://www.readbyqxmd.com/read/29662835/preoperative-low-muscle-mass-and-low-muscle-quality-negatively-impact-on-pulmonary-function-in-patients-undergoing-hepatectomy-for-hepatocellular-carcinoma
#19
Hisaya Shirai, Toshimi Kaido, Yuhei Hamaguchi, Atsushi Kobayashi, Shinya Okumura, Siyuan Yao, Shintaro Yagi, Naoko Kamo, Kojiro Taura, Hideaki Okajima, Shinji Uemoto
Background: Sarcopenia is a prognostic factor for mortality in digestive surgery. However, the correlation between preoperative cardiopulmonary function and sarcopenia in patients undergoing hepatectomy for hepatocellular carcinoma (HCC) remains unclear. Methods: The present study investigated the impact of preoperative sarcopenia on cardiopulmonary function in 402 patients who underwent first hepatectomy for HCC between April 2005 and April 2015. The quantity and quality of skeletal muscle were evaluated using psoas muscle index (PMI) and intramuscular adipose tissue content (IMAC), respectively, as determined from preoperative computed tomography imaging...
March 2018: Liver Cancer
https://www.readbyqxmd.com/read/29658965/a-comprehensive-transcriptome-analysis-of-skeletal-muscles-in-two-polish-pig-breeds-differing-in-fat-and-meat-quality-traits
#20
Katarzyna Piórkowska, Kacper Żukowski, Katarzyna Ropka-Molik, Mirosław Tyra, Artur Gurgul
Pork is the most popular meat in the world. Unfortunately, the selection pressure focused on high meat content led to a reduction in pork quality. The present study used RNA-seq technology to identify metabolic process genes related to pork quality traits and fat deposition. Differentially expressed genes (DEGs) were identified between pigs of Pulawska and Polish Landrace breeds for two the most important muscles (semimembranosus and longissimus dorsi). A total of 71 significant DEGs were reported: 15 for longissimus dorsi and 56 for semimembranosus muscles...
January 2018: Genetics and Molecular Biology
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