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muscle protein degradation

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https://www.readbyqxmd.com/read/28806139/mask-mitigates-mapt-and-fus-induced-degeneration-by-enhancing-autophagy-through-lysosomal-acidification
#1
Mingwei Zhu, Sheng Zhang, Xiaolin Tian, Chunlai Wu
Accumulation of intracellular misfolded or damaged proteins is associated with both normal aging and late-onset degenerative diseases. Two cellular clearance mechanisms, the ubiquitin-proteasome system (UPS) and the macroautophagy/autophagy-lysosomal pathway, work in concert to degrade harmful protein aggregates and maintain protein homeostasis. Here we show that Mask, an Ankyrin-repeat and KH-domain containing protein, plays a key role in promoting autophagy flux and mitigating degeneration caused by protein aggregation or impaired UPS function...
August 14, 2017: Autophagy
https://www.readbyqxmd.com/read/28800772/endurance-training-lowers-ribosome-density-despite-increasing-ribosome-biogenesis-markers-in-rodent-skeletal-muscle
#2
Matthew A Romero, C Brooks Mobley, Melissa A Linden, Grace Margaret-Eleanor Meers, Jeffrey S Martin, Kaelin C Young, R Scott Rector, Michael D Roberts
OBJECTIVE: The purpose of this study was to examine if: (a) high sugar/high fat Western diet (WD)-feeding affects skeletal muscle ribosome biogenesis markers in hyperphagic, diabetic-prone Otsuka Long-Evans Tokushima Fatty (OLETF) rats, and (b) 12 weeks of treadmill training rescued potential detriments that WD feeding exerted on these markers. METHODS: Eight week-old male OLETF rats were fed a low-fat control diet (O-CON, n = 10) or high/sucrose/cholesterol Western diet (WD)...
August 11, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28798142/accumulation-of-smooth-muscle-22%C3%AE-protein-accelerates-senescence-of-vascular-smooth-muscle-cells-via-stabilization-of-p53-in-vitro-and-in-vivo
#3
Sui-Bing Miao, Xiao-Li Xie, Ya-Juan Yin, Li-Li Zhao, Fan Zhang, Ya-Nan Shu, Rong Chen, Peng Chen, Li-Hua Dong, Yan-Ling Lin, Pin Lv, Dan-Dan Zhang, Xi Nie, Zhen-Ying Xue, Mei Han
OBJECTIVE: Smooth muscle (SM) 22α, an actin-binding protein, displays an upregulated expression as a marker during cellular senescence. However, the causal relationship between SM22α and senescence is poorly understood. This study aimed to investigate the role of SM22α in angiotensin II (Ang II)-induced senescence of vascular smooth muscle cells (VSMCs). APPROACH AND RESULTS: We prepared a model of VSMC senescence induced by Ang II and found that the expression of SM22α in VSMCs was increased in response to chronic Ang II treatment...
August 10, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/28797528/actinin-1-and-actinin-4-play-essential-but-distinct-roles-in-invadopodia-formation-by-carcinoma-cells
#4
Hideki Yamaguchi, Yuumi Ito, Nami Miura, Yuko Nagamura, Ayaka Nakabo, Kiyoko Fukami, Kazufumi Honda, Ryuichi Sakai
Invadopodia are ventral membrane protrusions formed by cancer cells that degrade the extracellular matrix (ECM) during tumor invasion and metastasis. Formation of invadopodia is initiated by the assembly of actin filaments (F-actin) that results from the coordinated activation of several actin regulatory proteins. Actinin-1 and actinin-4 are actin bundling proteins expressed in non-muscle cells and actinin-4 is preferentially associated with malignant phenotypes of carcinoma cells. In this study, we investigated the role of actinin-1 and -4 in invadopodia formation...
August 1, 2017: European Journal of Cell Biology
https://www.readbyqxmd.com/read/28795394/mitophagy-in-maintaining-skeletal-muscle-mitochondrial-proteostasis-and-metabolic-health-with-aging
#5
Joshua C Drake, Zhen Yan
Skeletal muscle is important for overall functionality and health. Aging is associated with an accumulation of damage to mitochondria DNA and proteins. In particular, damage to mitochondrial proteins in skeletal muscle, which is a loss of mitochondrial proteostasis, contributes to tissue dysfunction and negatively impacts systemic health. Therefore, understanding the mechanisms underlying the regulation of mitochondrial proteostasis and how those mechanisms change with age is important for the development of interventions to promote healthy aging...
August 10, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28792534/primary-bovine-skeletal-muscle-cells-enters-apoptosis-rapidly-via-the-intrinsic-pathway-when-available-oxygen-is-removed
#6
Sissel Beate Rønning, Petter Vejle Andersen, Mona Elisabeth Pedersen, Kristin Hollung
Muscle cells undergo changes post-mortem during the process of converting muscle into meat, and this complex process is far from revealed. Recent reports have suggested programmed cell death (apoptosis) to be important in the very early period of converting muscle into meat. The dynamic balance that occurs between anti-apoptotic members, such as Bcl-2, and pro-apoptotic members (Bid, Bim) helps determine whether the cell initiates apoptosis. In this study, we used primary bovine skeletal muscle cells, cultured in monolayers in vitro, to investigate if apoptosis is induced when oxygen is removed from the growth medium...
2017: PloS One
https://www.readbyqxmd.com/read/28782921/autophagy-in-stem-cell-aging
#7
Miren Revuelta, Ander Matheu
Aging is responsible for changes in mammalian tissues that result in an imbalance to tissue homeostasis and a decline in the regeneration capacity of organs due to stem cell exhaustion. Autophagy is a constitutive pathway necessary to degrade damaged organelles and protein aggregates. Autophagy is one of the hallmarks of aging, which involves a decline in the number and functionality of stem cells. Recent studies show that stem cells require autophagy to get rid of cellular waste produced during the quiescent stage...
August 7, 2017: Aging Cell
https://www.readbyqxmd.com/read/28782600/mir-18a-induces-myotubes-atrophy-by-down-regulating-igfi
#8
Chuncheng Liu, Meng Wang, Min Chen, Kuo Zhang, Lijie Gu, Qiuyan Li, Zhengquan Yu, Ning Li, Qingyong Meng
Muscle atrophy occurs when there is a net loss of muscle mass, leading to a change in the balance between protein synthesis and protein degradation. Igf1 is important for protein synthesis in muscle cells and can induce local skeletal muscle hypertrophy and attenuate age-related skeletal muscle atrophy via the PI3K/Akt pathway in mice, consequently restoring and improving muscle mass and strength. In this study, we show that miR-18a expression is down-regulated during C2C12 myoblast differentiation and mouse tibialis anterior muscle postnatal development...
August 4, 2017: International Journal of Biochemistry & Cell Biology
https://www.readbyqxmd.com/read/28765970/bmp-7-enhances-snon-mrna-expression-in-renal-tubular-epithelial-cells-under-high-glucose-conditions
#9
Yuanyuan Wang, Ying Xiao, Shuang Li, Lei Shi, Lirong Liu, Yingying Zhang, Mingjun Shi, Bing Guo
The present study aimed to identify any association between bone morphogenetic protein‑7 (BMP‑7) and the expression of the transcriptional co‑repressor Ski‑related novel protein N (SnoN), in addition to alterations in tubulointerstitial fibrosis, during the development and progression of diabetic nephropathy (DN). Streptozotocin was injected into the tail veins of 20 healthy and specific pathogen‑free male Sprague‑Dawley rats. The rats were sacrificed to detect the appropriate biochemical indicators of renal pathological alterations following 24 weeks...
September 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28765595/integration-of-mirna-and-mrna-expression-profiles-reveals-microrna-regulated-networks-during-muscle-wasting-in-cardiac-cachexia
#10
Leonardo N Moraes, Geysson J Fernandez, Ivan J Vechetti-Júnior, Paula P Freire, Rodrigo W A Souza, Rolando A R Villacis, Silvia R Rogatto, Patricia P Reis, Maeli Dal-Pai-Silva, Robson F Carvalho
Cardiac cachexia (CC) is a common complication of heart failure (HF) associated with muscle wasting and poor patient prognosis. Although different mechanisms have been proposed to explain muscle wasting during CC, its pathogenesis is still not understood. Here, we described an integrative analysis between miRNA and mRNA expression profiles of muscle wasting during CC. Global gene expression profiling identified 1,281 genes and 19 miRNAs differentially expressed in muscle wasting during CC. Several of these deregulated genes are known or putative targets of the altered miRNAs, including miR-29a-3p, miR-29b-3p, miR-210-5p, miR-214, and miR-489...
August 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28764014/generation-of-bioactive-peptides-from-duck-meat-during-post-mortem-aging
#11
Dongmei Liu, Xing Chen, Jichao Huang, Ming Huang, Guanghong Zhou
The objective of this study was to investigate the endogenous release of bioactive peptides in duck meat during 7days of post-mortem aging. The degradation of muscle proteins led to release of small peptides (<5kDa). The peptides formed in the samples after 3days post-mortem exhibited highest DPPH radical scavenging, oxygen radical scavenging (ORAC) and ferric reducing antioxidant power (FRAP). By using size-exclusion chromatography, the initial extract was purified into three fractions (A-C) in which fraction C exhibited the highest antioxidant activity...
December 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28756711/the-potential-of-obscurin-as-a-therapeutic-target-in-muscle-disorders
#12
Davide Randazzo, Enrico Pierantozzi, Daniela Rossi, Vincenzo Sorrentino
Obscurin, a giant protein of striated muscles, is emerging as an important player in a wide range of processes including myofibril assembly and maintenance, muscle protein degradation and intracellular signaling. Accordingly, obscurin participates to the mechanisms by which muscles adapt to physiological requirements or to pathological cues associated with cardiac and skeletal muscle diseases. Areas covered: The structure of the different obscurin isoforms identified so far, their tissue distribution and the most recent findings on obscurin in invertebrates and mammals will be reviewed...
July 29, 2017: Expert Opinion on Therapeutic Targets
https://www.readbyqxmd.com/read/28751541/downregulation-of-cavin-1-expression-via-increasing-caveolin-1-degradation-prompts-the-proliferation-and-migration-of-vascular-smooth-muscle-cells-in-balloon-injury-induced-neointimal-hyperplasia
#13
Li-Jun Zhou, Xue-Ying Chen, Shui-Ping Liu, Lin-Lin Zhang, Ya-Nan Xu, Pan-Wei Mu, Deng-Feng Geng, Zhi Tan
BACKGROUND: Percutaneous coronary intervention has been widely used in the treatment of ischemic heart disease, but vascular restenosis is a main limitation of percutaneous coronary intervention. Our previous work reported that caveolin-1 had a key functional role in intimal hyperplasia, whereas whether Cavin-1 (another important caveolae-related protein) was involved is still unknown. Therefore, we will investigate the effect of Cavin-1 on neointimal formation. METHODS AND RESULTS: Balloon injury markedly reduced Cavin-1 protein and enhanced ubiquitin protein expression accompanied with neointimal hyperplasia in injured carotid arteries, whereas Cavin-1 mRNA had no change...
July 27, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28747825/biological-differences-between-hanwoo-longissimus-dorsi-and-semimembranosus-muscles-in-collagen-synthesis-of-fibroblasts
#14
Sivakumar Allur Subramaniyan, Inho Hwang
Variations in physical toughness between muscles and animals are a function of growth rate and extend of collagen type I and III. The current study was designed to investigate the ability of growth rate, collagen concentration, collagen synthesizing and degrading genes on two different fibroblast cells derived from Hanwoo m. longissimus dorsi (LD) and semimembranosus (SM) muscles. Fibroblast cell survival time was determined for understanding about the characteristics of proliferation rate between the two fibroblasts...
2017: Korean Journal for Food Science of Animal Resources
https://www.readbyqxmd.com/read/28740309/assessment-of-the-textural-variation-of-iced-stored-anabas-testudineus-bloch-1792-muscle-tissue-with-emphasis-on-their-collagen-and-myofibrillar-protein-content
#15
Treesa Varghese, Saleena Mathew
Post-mortem biochemical and physiological changes of climbing perch (Anabas testudineus) muscle evaluated during iced storage of 18 days compared with muscle protein content. Changes in the protein fractions, rigor index, pH value, water holding capacity, expressible water content, cook loss, textural parameters, and histochemical properties of the post mortem fish muscle were studied. The whole fish were in full rigor condition till fifth day of storage. Initial muscle pH value of 6.97 was dropped to 6.90 when the fish reached in full rigor condition, this then increased to 7...
July 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28739398/transcriptome-analysis-of-ifm-specific-actin-and-myosin-nulls-in-drosophila-melanogaster-unravels-lesion-specific-expression-blueprints-across-muscle-mutations
#16
Aditi Madan, Divesh Thimmaiya, Ari Franco-Cea, Mohammed Aiyaz, Prabodh Kumar, John C Sparrow, Upendra Nongthomba
Muscle contraction is a highly fine-tuned process that requires the precise and timely construction of large protein sub-assemblies to form sarcomeres. Mutations in many genes encoding constituent proteins of this macromolecular machine result in defective functioning of the muscle tissue. However, the pathways underlying muscle degeneration, and manifestation of myopathy phenotypes are not well understood. In this study, we explored transcriptional alterations that ensue from the absence of the two major muscle proteins - myosin and actin - using the Drosophila indirect flight muscles...
July 21, 2017: Gene
https://www.readbyqxmd.com/read/28732027/serum-irisin-and-myostatin-levels-after-2-weeks-of-high-altitude-climbing
#17
Ewa Śliwicka, Tomasz Cisoń, Zbigniew Kasprzak, Alicja Nowak, Łucja Pilaczyńska-Szcześniak
Exposure to high-altitude hypoxia causes physiological and metabolic adaptive changes by disturbing homeostasis. Hypoxia-related changes in skeletal muscle affect the closely interconnected energy and regeneration processes. The balance between protein synthesis and degradation in the skeletal muscle is regulated by several molecules such as myostatin, cytokines, vitamin D, and irisin. This study investigates changes in irisin and myostatin levels in male climbers after a 2-week high-altitude expedition, and their association with 25(OH)D and indices of inflammatory processes...
2017: PloS One
https://www.readbyqxmd.com/read/28730836/effects-of-rapid-or-slow-body-weight-reduction-on-intramuscular-protein-degradation-pathways-during-equivalent-weight-loss-on-rats
#18
Y Nonaka, S Urashima, M Inai, S Nishimura, K Higashida, S Terada
The purpose of this study was to compare the effects of short-term fasting-induced rapid weight loss with those of slower but equivalent body weight loss induced by daily calorie restriction on muscle protein degradation pathways and muscle protein content. Male Fischer rats were subjected to either 30 % calorie restriction for 2 weeks to slowly decrease body weight (Slow) or 3-day fasting to rapidly decrease body weight by a comparable level of that of the Slow group (Rapid). The final body weights were about 15 % lower in both the Slow and Rapid groups than in the Con group (p<0...
July 18, 2017: Physiological Research
https://www.readbyqxmd.com/read/28727149/aortic-microcalcification-associates-with-elastin-fragmentation-in-marfan-syndrome
#19
Shaynah A Wanga, Stijntje Hibender, Yanto Ridwan, Cindy van Roomen, Mariska Vos, Ingeborg van der Made, Nicole van Vliet, Romy Franken, Luigi Amjg van Riel, Maarten Groenink, Aeilko H Zwinderman, Barbara Jm Mulder, Carlie Jm de Vries, Jeroen Essers, Vivian de Waard
Marfan syndrome (MFS) is a connective tissue disorder, in which aortic rupture is the major cause of death. MFS patients with an aortic diameter below the advised limit for prophylactic surgery (<5cm) may unexpectedly experience an aortic dissection or rupture, despite yearly monitoring. Hence, there is a clear need for improved prognostic markers to predict such aortic events. We hypothesize that elastin fragments play a causal role in aortic calcification in MFS and that microcalcification serves as a marker for aortic disease severity...
July 20, 2017: Journal of Pathology
https://www.readbyqxmd.com/read/28727041/proteomic-features-linked-to-tenderness-of-aged-pork-loins
#20
K B Carlson, K J Prusa, C A Fedler, E M Steadham, E Huff-Lonergan, S M Lonergan
There is considerable evidence that the protein component of fresh pork makes a major contribution to tenderness. In particular, the proteomic profile can be linked to postmortem events including pH decline, tissue oxidation, and protein degradation. The objectives for this study were to determine differences in sarcoplasmic proteomes that contribute to tenderness variation in aged pork longissimus dorsi muscles (LM). A defined set of pork loins selected to be similar in pH, color, and lipid yet different in tenderness were used...
June 2017: Journal of Animal Science
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