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muscle protein degradation

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https://www.readbyqxmd.com/read/28935570/molecular-alterations-in-a-mouse-cardiac-model-of-friedreich-s-ataxia-an-impaired-nrf2-response-mediated-via-up-regulation-of-keap1-and-activation-of-the-gsk3%C3%AE-axis
#1
Amy Anzovino, Shannon Chiang, Bronwyn E Brown, Clare L Hawkins, Des R Richardson, Michael L-H Huang
Nuclear factor-erythroid 2-related factor-2 (Nrf2) is a master regulator of the anti-oxidant response. However, studies in models of Friedreich's ataxia (FA), a neuro- and cardio-degenerative disease associated with oxidative stress, reported decreased Nrf2 expression due to unknown mechanisms. Using a mouse conditional frataxin knockout (KO) model in the heart and skeletal muscle, we examined the Nrf2 pathway in these tissues. Frataxin KO results in fatal cardiomyopathy, while skeletal muscle was asymptomatic...
September 18, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/28933591/suppression-of-chrn-endocytosis-by-carbonic-anhydrase-car3-in-the-pathogenesis-of-myasthenia-gravis
#2
Ailian Du, Shiqian Huang, Xiaonan Zhao, Kuan Feng, Shuangyan Zhang, Jiefang Huang, Xiang Miao, Fulvio Baggi, Rennolds S Ostrom, Yanyun Zhang, Xiangjun Chen, Congfeng Xu
Myasthenia gravis is an autoimmune disorder of the neuromuscular junction manifested as fatigable muscle weakness, which is typically caused by pathogenic autoantibodies against postsynaptic CHRN/AChR (cholinergic receptor nicotinic) in the endplate of skeletal muscle. Our previous studies have identified CA3 (carbonic anhydrase 3) as a specific protein insufficient in skeletal muscle from myasthenia gravis patients. In this study, we investigated the underlying mechanism of how CA3 insufficiency might contribute to myasthenia gravis...
September 21, 2017: Autophagy
https://www.readbyqxmd.com/read/28930587/prenylcysteine-oxidase-1-a-pro-oxidant-enzyme-of-low-density-lipoproteins
#3
Luis V Herrera-Marcos, Jose M Lou-Bonafonte, Maria V Martinez-Gracia, Carmen Arnal, María A Navarro, Jesus Osada
Elevated levels of low density lipoproteins (LDLs) cause atherosclerotic disease, and proteomic analyses have found that these lipoproteins are endowed with prenylcysteine lyase. This systematic review summarizes current understanding of this enzyme, now known as prenylcysteine oxidase 1 (PCYOX1), which hydrolyzes the thioether bond of prenylcysteines in the final step in the degradation of prenylated proteins, releasing hydrogen peroxide, cysteine and the isoprenoid aldehyde. Despite the high variability of the PCYOX1 gene, no polymorphism has yet been associated with any disease...
January 1, 2018: Frontiers in Bioscience (Landmark Edition)
https://www.readbyqxmd.com/read/28927399/novel-phenotypic-variant-in-the-myh7-spectrum-due-to-a-stop-loss-mutation-in-the-c-terminal-region-a-case-report
#4
Zsolt Bánfai, Kinga Hadzsiev, Endre Pál, Katalin Komlósi, Márton Melegh, László Balikó, Béla Melegh
BACKGROUND: Defects of the slow myosin heavy chain isoform coding MYH7 gene primarily cause skeletal myopathies including Laing Distal Myopathy, Myosin Storage Myopathy and are also responsible for cardiomyopathies. Scapuloperoneal and limb-girdle muscle weakness, congenital fiber type disproportion, multi-minicore disease were also reported in connection of MYH7. Pathogeneses of the defects in the head and proximal rod region of the protein are well described. However, the C-terminal mutations of the MYH7 gene are less known...
September 19, 2017: BMC Medical Genetics
https://www.readbyqxmd.com/read/28912780/inflammatory-markers-for-arterial-stiffness-in-cardiovascular-diseases
#5
REVIEW
Ioana Mozos, Clemens Malainer, Jarosław Horbańczuk, Cristina Gug, Dana Stoian, Constantin Tudor Luca, Atanas G Atanasov
Arterial stiffness predicts an increased risk of cardiovascular events. Inflammation plays a major role in large arteries stiffening, related to atherosclerosis, arteriosclerosis, endothelial dysfunction, smooth muscle cell migration, vascular calcification, increased activity of metalloproteinases, extracellular matrix degradation, oxidative stress, elastolysis, and degradation of collagen. The present paper reviews main mechanisms explaining the crosstalk between inflammation and arterial stiffness and the most common inflammatory markers associated with increased arterial stiffness, considering the most recent clinical and experimental studies...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28912364/novel-pathological-role-of-hnrnpa1-heterogeneous-nuclear-ribonucleoprotein-a1-in-vascular-smooth-muscle-cell-function-and-neointima-hyperplasia
#6
Li Zhang, Qishan Chen, Weiwei An, Feng Yang, Eithne Margaret Maguire, Dan Chen, Cheng Zhang, Guanmei Wen, Mei Yang, Bin Dai, Le Anh Luong, Jianhua Zhu, Qingbo Xu, Qingzhong Xiao
OBJECTIVE: hnRNPA1 (heterogeneous nuclear ribonucleoprotein A1) plays a variety of roles in gene expression. However, little is known about the functional involvement of hnRNPA1 in vascular smooth muscle cell (VSMC) function and neointima hyperplasia. In this study, we have attempted to investigate the functional roles of hnRNPA1 in the contexts of VSMC function, injury-induced vessel remodeling, and human atherosclerotic lesions, as well as discern the molecular mechanisms involved. APPROACH AND RESULTS: hnRNPA1 expression levels were consistently modulated during VSMC phenotype switching and neointimal lesion formation induced by wire injury...
September 14, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/28899909/depletion-of-the-mrna-translation-initiation-inhibitor-programmed-cell-death-protein-4-pdcd4-impairs-l6-myotube-formation
#7
Naomi Maeda, Abdikarim Abdullahi, Brendan Beatty, Zameer Dhanani, Olasunkanmi A J Adegoke
The mechanistic (mammalian) target of rapamycin complex 1 (mTORC1) signaling is vital for optimal muscle mass and function. Although the significance of mTORC1 in stimulating muscle growth is unequivocal, evidence in support of its role during muscle regeneration is less clear. Here, we showed that the abundance (protein and mRNA) of the mTORC1/S6K1 substrate, programmed cell death protein 4 (PDCD4), is upregulated at the onset of differentiation of L6 and C2C12 cells. The increase in PDCD4 was not associated with any changes in S6K1 activation, but the abundance of beta transducing repeat-containing protein (β-TrCP), the ubiquitin ligase that targets PDCD4 for degradation, increased...
September 2017: Physiological Reports
https://www.readbyqxmd.com/read/28898058/mechanoregulation-of-sm22%C3%AE-transgelin
#8
Rong Liu, M Moazzem Hossain, Xuequn Chen, Jian-Ping Jin
SM22α, also named transgelin, is an actin filament-associated protein in smooth muscle and fibroblast. Three decades after discovery, the biological function of SM22α remains under investigation. Here we report a novel finding that the expression and degradation of SM22α/transgelin is regulated by mechanical tension. Following a mass spectrometry identification of SM22α degradation in isolated and tension-unloaded mouse aorta, we developed specific monoclonal antibodies to study the regulation of SM22α in human fetal lung myofibroblast line MRC-5 and primary cultures of neonatal mouse skin fibroblast...
September 12, 2017: Biochemistry
https://www.readbyqxmd.com/read/28895052/the-effects-of-periostin-in-a-rat-model-of-isoproterenol-mediated-cardiotoxicity
#9
Mahmut Sözmen, Alparslan K Devrim, Yonca B Kabak, Tuba Devrim, Mert Sudagidan
Periostin is an extracellular matrix protein from fasciclin family, and it plays an important role in the cell adhesion, migration, and growth of the organism. Periostin prevents apoptosis while stimulating cardiomyocytes. The present study was designed to investigate cardioprotective effects of the recombinant murine periostin peptide administration in a rat model of isoproterenol (ISO)-induced myocardial injury. The experiment was performed on 84 adult male Sprague Dawley rats in 4 groups (n = 21): control group (1), periostin-treated group (2), ISO-treated group (3), and ISO + periostin-treated group (4)...
September 11, 2017: Cardiovascular Toxicology
https://www.readbyqxmd.com/read/28882868/genetic-ablation-of-microrna-33-attenuates-inflammation-and-abdominal-aortic-aneurysm-formation-via-several-anti-inflammatory-pathways
#10
Tetsushi Nakao, Takahiro Horie, Osamu Baba, Masataka Nishiga, Tomohiro Nishino, Masayasu Izuhara, Yasuhide Kuwabara, Hitoo Nishi, Shunsuke Usami, Fumiko Nakazeki, Yuya Ide, Satoshi Koyama, Masahiro Kimura, Naoya Sowa, Satoko Ohno, Hiroki Aoki, Koji Hasagawa, Kazuhisa Sakamoto, Kenji Minatoya, Takeshi Kimura, Koh Ono
OBJECTIVE: Abdominal aortic aneurysm (AAA) is an increasingly prevalent and ultimately fatal disease with no effective pharmacological treatment. Because matrix degradation induced by vascular inflammation is the major pathophysiology of AAA, attenuation of this inflammation may improve its outcome. Previous studies suggested that microRNA-33 inhibition and genetic ablation of microRNA-33 increased serum high-density lipoprotein cholesterol and attenuated atherosclerosis. APPROACH AND RESULTS: MicroRNA-33a-5p expression in central zone of human AAA was higher than marginal zone...
September 7, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/28881660/activation-of-perk-branch-of-er-stress-mediates-homocysteine-induced-bkca-channel-dysfunction-in-coronary-artery-via-foxo3a-dependent-regulation-of-atrogin-1
#11
Wen-Tao Sun, Xiang-Chong Wang, Shiu-Kwong Mak, Guo-Wei He, Xiao-Cheng Liu, Malcolm John Underwood, Qin Yang
The molecular mechanism of endoplasmic reticulum (ER) stress in vascular pathophysiology remains inadequately understood. We studied the role of ER stress in homocysteine-induced impairment of coronary dilator function, with uncovering the molecular basis of the effect of ER stress on smooth muscle large-conductance Ca(2+)-activated K(+) (BKCa) channels. The vasodilatory function of BKCa channels was studied in a myograph using endothelium-denuded porcine small coronary arteries. Primary cultured porcine coronary artery smooth muscle cells were used for mRNA and protein measurements and current recording of BKCa channels...
August 1, 2017: Oncotarget
https://www.readbyqxmd.com/read/28872460/deficiency-in-kelch-protein-klhl31-causes-congenital-myopathy-in-mice
#12
James B Papizan, Glynnis A Garry, Svetlana Brezprozvannaya, John R McAnally, Rhonda Bassel-Duby, Ning Liu, Eric N Olson
Maintenance of muscle structure and function depends on the precise organization of contractile proteins into sarcomeres and coupling of the contractile apparatus to the sarcoplasmic reticulum (SR), which serves as the reservoir for calcium required for contraction. Several members of the Kelch superfamily of proteins, which modulate protein stability as substrate-specific adaptors for ubiquitination, have been implicated in sarcomere formation. The Kelch protein Klhl31 is expressed in a muscle-specific manner under control of the transcription factor MEF2...
September 5, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28862673/igf-1-attenuates-hypoxia-induced-atrophy-but-inhibits-myoglobin-expression-in-c2c12-skeletal-muscle-myotubes
#13
Eva L Peters, Sandra M van der Linde, Ilse S P Vogel, Mohammad Haroon, Carla Offringa, Gerard M J de Wit, Pieter Koolwijk, Willem J van der Laarse, Richard T Jaspers
Chronic hypoxia is associated with muscle wasting and decreased oxidative capacity. By contrast, training under hypoxia may enhance hypertrophy and increase oxidative capacity as well as oxygen transport to the mitochondria, by increasing myoglobin (Mb) expression. The latter may be a feasible strategy to prevent atrophy under hypoxia and enhance an eventual hypertrophic response to anabolic stimulation. Mb expression may be further enhanced by lipid supplementation. We investigated individual and combined effects of hypoxia, insulin-like growth factor (IGF)-1 and lipids, in mouse skeletal muscle C2C12 myotubes...
September 1, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28860475/long-term-pgc1%C3%AE-overexpression-leads-to-apoptosis-autophagy-and-muscle-wasting
#14
Danesh H Sopariwala, Vikas Yadav, Pierre-Marie Badin, Neah Likhite, Megha Sheth, Sabina Lorca, Isabelle K Vila, Eun Ran Kim, Qingchun Tong, Min Sup Song, George G Rodney, Vihang A Narkar
Skeletal muscle wasting is prevalent in many chronic diseases, necessitating inquiries into molecular regulation of muscle mass. Nuclear receptor co-activator peroxisome proliferator-activated receptor co-activator 1 alpha (PGC1α) and its splice variant PGC1α4 increase skeletal muscle mass. However, the effect of the other PGC1 sub-type, PGC1β, on muscle size is unclear. In transgenic mice selectively over-expressing PGC1β in the skeletal muscle, we have found that PGC1β progressively decreases skeletal muscle mass predominantly associated with loss of type 2b fast-twitch myofibers...
August 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28859691/effect-of-oregano-essential-oil-and-benzoic-acid-supplementation-to-a-low-protein-diet-on-meat-quality-fatty-acid-composition-and-lipid-stability-of-longissimus-thoracis-muscle-in-pigs
#15
Chuanshang Cheng, Xiaming Zhang, Mao Xia, Zuhong Liu, Hongkui Wei, Zhao Deng, Chao Wang, Siwen Jiang, Jian Peng
BACKGROUND: Consumers are becoming increasingly interested in food containing appropriately high concentration of intramuscular fat (IMF) and polyunsaturated fatty acids (PUFA). The supplementation of feed with antioxidants decreases degradation of lipids in muscles thereby enhances nutritional and sensory properties of meat. Two experiments were conducted to determine the effects of adding oregano essential oil (OEO) and benzoic acid (BA) to low-protein, amino acid-supplemented diets on meat quality, sensory profile, fatty acid composition, and lipid oxidation of longissimus thoracis (LT) muscle in pigs...
August 31, 2017: Lipids in Health and Disease
https://www.readbyqxmd.com/read/28855275/dynamic-proteome-profiling-of-individual-proteins-in-human-skeletal-muscle-after-a-high-fat-diet-and-resistance-exercise
#16
Donny M Camera, Jatin G Burniston, Mark A Pogson, William J Smiles, John A Hawley
It is generally accepted that muscle adaptation to resistance exercise (REX) training is underpinned by contraction-induced, increased rates of protein synthesis and dietary protein availability. By using dynamic proteome profiling (DPP), we investigated the contribution of both synthesis and breakdown to changes in abundance on a protein-by-protein basis in human skeletal muscle. Age-matched, overweight males consumed 9 d of a high-fat, low-carbohydrate diet during which time they either undertook 3 sessions of REX or performed no exercise...
August 30, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28852047/tca-cycle-rewiring-fosters-metabolic-adaptation-to-oxygen-restriction-in-skeletal-muscle-from-rodents-and-humans
#17
Daniele Capitanio, Chiara Fania, Enrica Torretta, Agnese Viganò, Manuela Moriggi, Valentina Bravatà, Anna Caretti, Denny Z H Levett, Michael P W Grocott, Michele Samaja, Paolo Cerretelli, Cecilia Gelfi
In mammals, hypoxic stress management is under the control of the Hypoxia Inducible Factors, whose activity depends on the stabilization of their labile α subunit. In particular, the skeletal muscle appears to be able to react to changes in substrates and O2 delivery by tuning its metabolism. The present study provides a comprehensive overview of skeletal muscle metabolic adaptation to hypoxia in mice and in human subjects exposed for 7/9 and 19 days to high altitude levels. The investigation was carried out combining proteomics, qRT-PCR mRNA transcripts analysis, and enzyme activities assessment in rodents, and protein detection by antigen antibody reactions in humans and rodents...
August 29, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28851806/the-deubiquitinase-usp10-regulates-integrin-beta1-and-beta5-and-fibrotic-wound-healing
#18
Stephanie R Gillespie, Liana J Tedesco, Lingyan Wang, Audrey M Bernstein
Scarring and fibrotic disease result from the persistence of myofibroblasts characterized by high surface expression of αv integrins and subsequent activation of TGFβ, however the mechanism controlling their surface abundance is unknown. Genetic screening revealed that human primary stromal corneal myofibroblasts overexpress a subset of deubiquitinating enzymes (DUBs), which remove ubiquitin from proteins, preventing degradation. Silencing of the DUB USP10 induces a buildup of ubiquitin on integrins β1 and β5 in cell lysates whereas recombinant USP10 removes ubiquitin from these integrin subunits...
August 29, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28835844/polar-bears-experience-skeletal-muscle-atrophy-in-response-to-food-deprivation-and-reduced-activity-in-winter-and-summer
#19
John P Whiteman, Henry J Harlow, George M Durner, Eric V Regehr, Bryan C Rourke, Manuel Robles, Steven C Amstrup, Merav Ben-David
When reducing activity and using stored energy during seasonal food shortages, animals risk degradation of skeletal muscles, although some species avoid or minimize the resulting atrophy while experiencing these conditions during hibernation. Polar bears may be food deprived and relatively inactive during winter (when pregnant females hibernate and hunting success declines for other demographic groups) as well as summer (when sea ice retreats from key foraging habitats). We investigated muscle atrophy in samples of biceps femoris collected from free-ranging polar bears in the Southern Beaufort Sea (SBS) throughout their annual cycle...
2017: Conservation Physiology
https://www.readbyqxmd.com/read/28835671/a-chinese-herbal-formula-jian-pi-yi-shen-decoction-improves-muscle-atrophy-via-regulating-mitochondrial-quality-control-process-in-5-6-nephrectomised-rats
#20
Dongtao Wang, Jianping Chen, Xinhui Liu, Ping Zheng, Gaofeng Song, Tiegang Yi, Shunmin Li
Muscle atrophy is one of the serious complications of chronic kidney disease (CKD). Dysregulation of mitochondrial quality control (MQC) process, including decrease mitochondrial biogenesis, impair mitochondrial dynamics and induce activation of mitophagy, play an important role in mediating muscle wasting. This study aimed to observe effects of Jian-Pi-Yi-Shen (JPYS) decoction on muscle atrophy in CKD rats and explore its possible mechanism on regulation of MQC processes. The 5/6 nephrectomised rats were randomly allocated into 2 groups: CKD group and JPYS group...
August 23, 2017: Scientific Reports
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