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https://www.readbyqxmd.com/read/29147923/anti-aminoacyl-trna-synthetase-related-myositis-and-dermatomyositis-clues-for-differential-diagnosis-on-muscle-biopsy
#1
Bruna Cerbelli, Annalinda Pisano, Serena Colafrancesco, Maria Gemma Pignataro, Marco Biffoni, Silvia Berni, Antonia De Luca, Valeria Riccieri, Roberta Priori, Guido Valesini, Giulia d'Amati, Carla Giordano
Anti-synthetase syndrome is an autoimmune disease characterized by autoantibodies toward amino acyl-tRNA synthetases (ARS), anti-Jo 1 being the most commonly detected. Muscle damage develops in up to 90% of ARS-positive patients, characterized by a necrotizing myositis restricted to the perifascicular region. This topographic distribution of muscle damage may lead to a misdiagnosis of dermatomyositis (DM) at muscle biopsy. We compared morphological, immunohistochemical, and histoenzymatic features of muscle from ARS-positive patients (n = 11) with those of DM (n = 7) providing clues for their differential diagnosis...
November 16, 2017: Virchows Archiv: An International Journal of Pathology
https://www.readbyqxmd.com/read/29147102/the-relationships-between-muscle-fiber-characteristics-intramuscular-fat-content-and-fatty-acid-compositions-in-m-longissimus-lumborum-of-hanwoo-steers
#2
Seon-Tea Joo, Sung-Hyun Joo, Young-Hwa Hwang
The objective of this study was to investigate the relationship between muscle fiber characteristics, intramuscular fat (IMF) content, and fatty acids composition in longissimus lumborum (LL) muscle from Hanwoo steers. The LL muscles were obtained from four quality grades (QG) carcasses and subjected to histochemical analysis. There were significant (p<0.05) differences in fiber number percentage (FNP) and fiber area percentage (FAP) of muscle fiber types among muscles from four QGs. Both FNP and FAP of type I increased while those of type IIB decreased with increasing QG from QG 2 to QG 1(++) (p<0...
2017: Korean Journal for Food Science of Animal Resources
https://www.readbyqxmd.com/read/29147095/histochemical-characteristics-in-relation-to-meat-quality-traits-of-eight-major-muscles-from-hanwoo-steers
#3
Sung-Hyun Joo, Kyu-Won Lee, Young-Hwa Hwang, Seon-Tea Joo
The objective of this study was to determine the relationship between composition of muscle fiber types and meat quality traits of eight major muscles from Hanwoo steers. Longissimus lumborum (LL), psoas major (PM), semimembranosus (SM), semitendinosus (ST), gluteus medius (GM), triceps brachii (TB), rectus abdominis (RA) and superficialis flexor (SF) muscles were obtained from 9 Hanwoo steers and subjected to histochemical analysis. There were significant (p<0.05) differences in fiber number percentage (FNP) and fiber area percentage (FAP) of fiber types among these 8 major muscles...
2017: Korean Journal for Food Science of Animal Resources
https://www.readbyqxmd.com/read/29146687/exercise-induces-muscle-fiber-type-switching-via-transient-receptor-potential-melastatin-2-trpm2-dependent-ca-2-signaling
#4
Seo-Ho Lee, Byung-Ju Kim, Dae-Ryoung Park, Uh-Hyun Kim
The aim of the present study was to examine whether transient receptor potential melastatin 2 (TRPM2) plays a role in muscle fiber type transition during exercise. Mice were trained at a speed of 12 m/min at a slope of 0 ° for 60 min 5 consecutive d/wk for 4-wk. Exhaustion tests were performed on the treadmill (the speed was set at 6 m/min at a slope of 0° and increased at a rate of 1 m/min every 6 min). Isolated primary skeletal muscle cells from TRPM2 knockout (KO) mice showed lower amplitudes of electrical stimuli (ES)-induced Ca(2+) signals when compared to wild-type (WT) mice, due to a defect in Ca(2+) influx...
November 16, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29146092/ultrasonographic-evaluation-of-changes-in-the-muscle-architecture-of-the-gastrocnemius-with-botulinum-toxin-treatment-for-lower-extremity-spasticity-in-children-with-cerebral-palsy
#5
Akihiro Kawano, Taiichiro Yanagizono, Ichiro Kadouchi, Tetsuya Umezaki, Etsuo Chosa
BACKGROUND: Botulinum toxin A treatment involves injecting botulinum toxin A to relax muscle spasticity. Using ultrasonography, this study examined changes in the muscle architecture before and after treatment to evaluate the influence of botulinum toxin A injection on muscles. METHODS: The participants included 18 children (mean age, 6.2 years) with cerebral palsy who were treated with botulinum toxin A for lower extremity spasticity and 27 healthy children (mean age, 6...
November 13, 2017: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/29145886/are-mice-good-models-for-human-neuromuscular-disease-comparing-muscle-excursions-in-walking-between-mice-and-humans
#6
Xiao Hu, James P Charles, Turgay Akay, John R Hutchinson, Silvia S Blemker
BACKGROUND: The mouse is one of the most widely used animal models to study neuromuscular diseases and test new therapeutic strategies. However, findings from successful pre-clinical studies using mouse models frequently fail to translate to humans due to various factors. Differences in muscle function between the two species could be crucial but often have been overlooked. The purpose of this study was to evaluate and compare muscle excursions in walking between mice and humans. METHODS: Recently published musculoskeletal models of the mouse hindlimb and human lower limb were used to simulate muscle-tendon dynamics during mouse and human walking, a key daily activity...
November 16, 2017: Skeletal Muscle
https://www.readbyqxmd.com/read/29145245/case-reports-about-an-overlooked-cause-of-neck-pain-calcific-tendinitis-of-the-longus-colli-case-reports
#7
Yeong-Jin Kim, Jae-Young Park, Ki-Young Choi, Bong-Ju Moon, Jung-Kil Lee
STUDY DESIGN: Case description. OBJECTIVE: Acute calcific tendinitis of the longus colli muscle is a rare clinical entity that causes severe neck pain. This entity is not well recognized due to its nonspecific presentation such as acute neck pain, neck stiffness, and odynophagia. The importance of this disease with a review of the literature is presented. SUMMARY OF BACKGROUND DATA: Acute calcific tendinitis of the longus colli muscle is an inflammatory condition caused by deposition of calcium hydroxyapatite in the superior oblique tendon fibers of the longus colli muscle...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29145108/acute-calcific-tendinitis-of-the-longus-colli-muscle-masquerading-as-a-retropharyngeal-abscess-a-case-report-and-review-of-the-literature
#8
Uthman Alamoudi, Ahmed A Al-Sayed, Yasser AlSallumi, Matthew H Rigby, S Mark Taylor, Robert D Hart, Jonathan R B Trites
INTRODUCTION: Acute calcific longus colli tendinitis, also known as retropharyngeal or acute calcific prevertebral tendinitis, is a reactive self-limiting inflammatory response to acute or subacute deposition of amorphous calcium hydroxyapatite crystals in the tendons of the longus colli muscle, anterior to the C1-C2 disk space. CASE PRESENTATION: A 53-year-old man presented with a complaint of neck pain and odynophagia over a few days. Blood test findings showed mild leukocytosis and elevated C-reactive protein level...
November 11, 2017: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/29144589/-sphingosine-1-phosphate-immobilized-on-nanotopographical-scaffolds-improve-myogenic-differentiation
#9
Min Suk Lee, Hee Seok Yang
The skeletal muscle consists of highly aligned dense cables of collagen fibers with nanometer feature size to support muscle fibers. The skeletal myocyte can be greatly affected to differentiate by their surrounding topographical structure. To improve myogenic differentiation, we fabricated cell culture platform that sphingosine-1-phosphate (S1P) which regulated myocyte behavior was immobilized on a biomimetic nanopatterned polyurethaneacrylate (PUA) substrate using 3,4-dihydroxyphenylalanine (L-DOPA) for providing topographical and biological cues synergistically...
November 16, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/29144551/the-impact-of-volumetric-muscle-loss-injury-on-persistent-motoneuron-axotomy
#10
Benjamin T Corona, Kate E Flanagan, Christian M Brininger, Stephen M Goldman, Jarrod A Call, Sarah M Greising
INTRODUCTION: Volumetric muscle loss (VML) occurs following significant traumatic injury or surgical removal of skeletal muscle, resulting in non-recoverable loss of tissue and long-term dysfunction. Perhaps less recognized is that VML injuries inherently disrupt the neuromuscular unit, resulting in fiber denervation and presumptive motor unit rearrangement, expansion, and/or loss. To characterize neural dysfunction we quantified motoneuron axotomy, in efforts to understand how this relates to the temporal coordination of neuromuscular and morphological alterations due to injury...
November 16, 2017: Muscle & Nerve
https://www.readbyqxmd.com/read/29144179/effects-of-active-immunization-against-akirin2-on-muscle-fiber-type-composition-in-pigs
#11
Xiaoling Chen, Yafei Guo, Gang Jia, Hua Zhao, Guangmang Liu, Zhiqing Huang
The objective of this study was to investigate effects of active immunization against Akirin2 on muscle fiber-type composition in pigs. Here we showed that the titer of Akirin2 antibody in pigs immunized with porcine Akirin2 (pAkirin2) was significantly increased. Active immunization against pAkirin2 decreased succinic dehydrogenase and malate dehydrogenase activities and increased lactate dehydrogenase activity in the longissimus dorsi muscle of pigs. Active immunization against pAkirin2 significantly decreased MyHC I and MyHC IIa mRNA expressions and MyHC I protein expression and increased mRNA expressions of MyHC IIb as well as protein expressions of MyHC IIb and fast-MyHC...
November 16, 2017: Animal Biotechnology
https://www.readbyqxmd.com/read/29143581/multiple-sclerosis-symptoms-and-spasticity-management-new-data
#12
Guillermo Izquierdo
Spasticity, perceived by patients as muscle rigidity and spasms, is a common symptom in multiple sclerosis (MS). It is associated with functional impairment that can exacerbate other MS symptoms and reduce quality of life. Pharmacological treatment options are limited and frequently ineffective. Treatment adherence is a key issue to address in these patients. The efficacy and safety of 9-delta-tetrahydrocannabinol:cannabidiol (THC:CBD) oromucosal spray for treatment of MS spasticity were demonstrated in four Phase III trials...
November 2017: Neurodegenerative Disease Management
https://www.readbyqxmd.com/read/29143476/differences-in-innervated-neurons-of-the-internal-anal-sphincter-based-on-age-and-sex-a-histological-study
#13
Tomoaki Kaneko, Tetsuo Nemoto, Kimihiko Funahashi, Junichi Koike, Kazutoshi Shibuya, Hironori Kaneko
AIM: Previous studies have shown sex and age differences in anal sphincter function, but few morphological studies have focused on the quality and quantity of the nerves that control the sphincter muscles. The present study aimed to determine whether there are morphological and quantitative sex and age differences in the nerves in the conjoined longitudinal muscle. METHODS: This was a single-center, retrospective study using surgical specimens from 44 patients who underwent abdominoperineal resection between 2003 and 2012...
November 15, 2017: Geriatrics & Gerontology International
https://www.readbyqxmd.com/read/29143226/aligned-ovine-diaphragmatic-myoblasts-overexpressing-human-connexin-43-seeded-on-poly-l-lactic-acid-scaffolds-for-potential-use-in-cardiac-regeneration
#14
Carlos Sebastián Giménez, Paola Locatelli, Florencia Montini Ballarin, Alejandro Orlowski, Ricardo A Dewey, Milagros Pena, Gustavo Abel Abraham, Ernesto Alejandro Aiello, María Del Rosario Bauzá, Luis Cuniberti, Fernanda Daniela Olea, Alberto Crottogini
Diaphragmatic myoblasts (DMs) are precursors of type-1 muscle cells displaying high exhaustion threshold on account that they contract and relax 20 times/min over a lifespan, making them potentially useful in cardiac regeneration strategies. Besides, it has been shown that biomaterials for stem cell delivery improve cell retention and viability in the target organ. In the present study, we aimed at developing a novel approach based on the use of poly (L-lactic acid) (PLLA) scaffolds seeded with DMs overexpressing connexin-43 (cx43), a gap junction protein that promotes inter-cell connectivity...
November 15, 2017: Cytotechnology
https://www.readbyqxmd.com/read/29142848/injury-of-the-external-branch-of-the-superior-laryngeal-nerve-in-thyroid-surgery
#15
REVIEW
Andre S Potenza, Vergilius J F Araujo Filho, Claudio R Cernea
The external branch of the superior laryngeal nerve (EBSLN) innervates the cricothyroid muscle (CTM) to promote lengthening and thinning of the vocal fold, thus increasing voice pitch. The close relation with the superior thyroid vessels (STV) puts the EBSLN in risk every time the superior pole of the thyroid is dissected. It travels downward to innervate the CTM, lateral to the thyroid cartilage and to the inferior pharyngeal constrictor muscle (IPCM), being eventually covered by this muscle fibers as it approaches its entry point...
October 2017: Gland Surgery
https://www.readbyqxmd.com/read/29141882/transparent-anemone-shrimp-ancylomenes-pedersoni-become-opaque-after-exercise-and-physiological-stress-in-correlation-with-increased-hemolymph-perfusion
#16
Laura E Bagge, Stephen T Kinsey, Justin Gladman, Sönke Johnsen
Whole-body transparency, an effective camouflage strategy in many aquatic species, can be disrupted by environmental and/or physiological stressors. We found that tail-flip escape responses temporarily disrupt the transparency of the anemone shrimp Ancylomenes pedersoni After as few as three tail flips, the previously transparent abdominal muscle became cloudy. Eliciting additional tail flips to the point of exhaustion (16±1 s.e.m.; n=23) resulted in complete opacity, though the original transparency returned after 20-60 min of inactivity...
November 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/29140787/tgf-%C3%AE-requires-the-activation-of-canonical-and-non-canonical-signalling-pathways-to-induce-skeletal-muscle-atrophy
#17
Johanna Ábrigo, Fabian Campos, Felipe Simon, Claudia Riedel, Daniel Cabrera, Cristian Vilos, Claudio Cabello-Verrugio
The transforming growth factor type beta (TGF-β) induces skeletal muscle atrophy characterized by a decrease in fiber's diameter and levels of myosin heavy chain (MHC), also as an increase of MuRF-1 expression. In addition, TGF-β induces muscle atrophy by a mechanism dependent on reactive oxygen species (ROS). TGF-β signals by activating both canonical Smad-dependent, and non-canonical signalling pathways such as ERK1/2, JNK1/2, and p38 MAPKs. However, the participation of canonical and non-canonical signalling pathways in the TGF-β atrophic effect on skeletal muscle is unknown...
August 28, 2017: Biological Chemistry
https://www.readbyqxmd.com/read/29140299/pdgfr%C3%AE-regulated-by-mir-34a-and-foxo1-promotes-adipogenesis-in-porcine-intramuscular-preadipocytes-through-erk-signaling-pathway
#18
Yun-Mei Sun, Jin Qin, Shu-Ge Liu, Rui Cai, Xiao-Chang Chen, Xiang-Ming Wang, Wei-Jun Pang
Suitable intramuscular fat (IMF) content improves porcine meat quality. The vital genes regulating IMF deposition are necessary for the selection and breeding of an IMF trait. However, the effect and mechanism of PDGFRα on IMF deposition are still unclear. Here, PDGFRα is moderately expressed in porcine longissimus dorsi muscle (LD), whereas it highly expressed in white adipose tissue (WAT). Moreover, PDGFRα-positive cells were located in the gaps of LD fibers which there were IMF adipocytes. Compared with 180-day-old and lean-type pigs, the levels of PDGFRα were much higher in one-day-old and fat-type pigs...
November 15, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29139392/-myonuclear-domain-and-microtubule-proteome-during-skeletal-muscle-maturation
#19
Nathalie Couturier, Vincent Gache
In the normal course of muscle fiber development, myonuclei actively position and adapt a precise localization in mature fibers, shaping MyoNuclear Domains (MNDs). Myonuclei positioning in fibers appears to be essential for muscle function as defects in MNDs settings are always associated with dysfunction (i.e., centronuclear myopathy, sarcopenia). Previous studies have shown that myonuclei positioning in fibers is reversible, suggesting that in pathologies presenting MNDs impairment, myonuclei could be re-addressed to the "correct" position in fibers and this could benefit to muscle function...
November 2017: Médecine Sciences: M/S
https://www.readbyqxmd.com/read/29138988/irreversible-electroporation-of-the-uterine-cervix-in-a-rabbit-model
#20
Wei Chai, Wenlong Zhang, Zhentong Wei, Ying Xu, Jian Shi, Xiaomei Luo, Jianying Zeng, Manhua Cui, Jiannan Li, Lizhi Niu
The aim of this study was to evaluate the effects of irreversible electroporation (IRE) on the uterine cervix in a rabbit model. IRE ablation was performed in the cervices of 48 New Zealand rabbits, with one ablation lesion in each animal. Gross pathology, transmission electron microscopy, hematoxylin and eosin (H&E), Masson's trichrome (MT) stain, and terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assays were performed at pre-set time points (0 h, 12 h, 1 d, 2 d, 4 d, 7 d, 14 d, and 28 d post-IRE)...
November 14, 2017: Biomedical Microdevices
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