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Journal of Muscle Research and Cell Motility

Caputo Carlo, Bolaños Pura, Ramos Magaly, DiFranco Marino
Muscle fibres, isolated from frog tibialis anterior and mouse flexor digitorum brevis (FDB) were loaded with the fast dye MagFluo-4 to study the effects of potentiators caffeine, nitrate, Zn(2+) and perchlorate on Ca(2+) transients elicited by single action potentials. Overall, the potentiators doubled the transients amplitude and prolonged by about 1.5-fold their decay time. In contrast, as shown here for the first time, nitrate and Zn(2+), but not caffeine, activated a late, secondary component of the transient rising phase of frog but not mouse, fibres...
September 2, 2016: Journal of Muscle Research and Cell Motility
Pasquale Bianco, Massimo Reconditi, Gabriella Piazzesi, Vincenzo Lombardi
No abstract text is available yet for this article.
August 29, 2016: Journal of Muscle Research and Cell Motility
Teppei Ikeda, Osamu Ichii, Saori Otsuka-Kanazawa, Teppei Nakamura, Yaser Hosny Ali Elewa, Yasuhiro Kon
Skeletal muscle myofibers constantly undergo degeneration and regeneration. Histopathological features of 6 skeletal muscles (cranial tibial [CT], gastrocnemius, quadriceps femoris, triceps brachii [TB], lumbar longissimus muscles, and costal part of the diaphragm [CPD]) were compared using C57BL/10ScSn-Dmd (mdx) (mdx) mice, a model for muscular dystrophy versus control, C57BL/10 mice. Body weight and skeletal muscle mass were lower in mdx mice than the control at 4 weeks of age; these results were similar at 6-30 weeks...
July 29, 2016: Journal of Muscle Research and Cell Motility
Johann Caspar Rüegg
Wilhelm Hasselbach (1921-2015) is best known for his major contribution to the discovery and molecular elucidation of an ATP-driven active ion transport across a biological membrane. He had discovered SERCA, the calcium pump of the sarcoplasmic reticulum (Hasselbach and Makinose in Biochem Z 333:518-528, 1961; Biochem Z 339:94-111, 1963).
July 18, 2016: Journal of Muscle Research and Cell Motility
Wenjun Zheng, Sarah E Hitchcock-DeGregori, Bipasha Barua
Tropomyosin (Tpm) is a two-chained α-helical coiled-coil protein that binds to filamentous actin (F-actin), and regulates its interactions with myosin by occupying three average positions on F-actin (blocked, closed, and open). Mutations in the Tpm are linked to heart diseases including hypertrophic cardiomyopathy (HCM) and dilated cardiomyopathy (DCM). To elucidate the molecular mechanisms of Tpm mutations (including DCM mutation E54K, HCM mutations E62Q, A63V, K70T, V95A, D175N, E180G, L185R, E192K, and a designed synthetic mutation D137L) in terms of their effects on Tpm flexibility and its interactions with F-actin, we conducted extensive molecular dynamics simulations for the wild-type and mutant Tpm in complex with F-actin (total simulation time 160 ns per mutant)...
July 4, 2016: Journal of Muscle Research and Cell Motility
J Fernando Olivera, Gonzalo Pizarro
Raising the intracellular [Ca(2+)] ([Ca(2+)]i) was previously found to produce uncoupling between the electrical depolarization of the transverse tubules and contraction in skinned muscle fibers. Here we study the effect of elevated [Ca(2+)]i in voltage clamped cut fibers of frog skeletal muscle to establish how the charge movement, a measure of the activation of the dihydropyridine receptors (DHPR)-voltage sensors, and Ca(2+) release, a consequence of the opening of the ryanodine receptor (RyR)-release channels, were affected...
June 25, 2016: Journal of Muscle Research and Cell Motility
Feng Pan, Jing-Yi Mi, Yan Zhang, Xiao-Yun Pan, Yong-Jun Rui
The failure to accept reinnervation is considered to be one of the reasons for the poor motor functional recovery of intrinsic hand muscles (IHMs) after nerve injury. Rat could be a suitable model to be used in simulating motor function recovery of the IHMs after nerve injury as to the similarities in function and anatomy of the muscles between human and rat. However, few studies have reported the muscle fiber types composition and endplate morphologic characteristics of intrinsic forepaw muscles (IFMs) in the rat...
June 2016: Journal of Muscle Research and Cell Motility
Francesca D'Avila, Mirella Meregalli, Sara Lupoli, Matteo Barcella, Alessandro Orro, Francesca De Santis, Clementina Sitzia, Andrea Farini, Pasqualina D'Ursi, Silvia Erratico, Riccardo Cristofani, Luciano Milanesi, Daniele Braga, Daniele Cusi, Angelo Poletti, Cristina Barlassina, Yvan Torrente
Myofibrillar myopathies (MFMs) are genetically heterogeneous dystrophies characterized by the disintegration of Z-disks and myofibrils and are associated with mutations in genes encoding Z-disk or Z-disk-related proteins. The c.626 C > T (p.P209L) mutation in the BAG3 gene has been described as causative of a subtype of MFM. We report a sporadic case of a 26-year-old Italian woman, affected by MFM with axonal neuropathy, cardiomyopathy, rigid spine, who carries the c.626 C > T mutation in the BAG3 gene...
June 2016: Journal of Muscle Research and Cell Motility
John Jeshurun Michael, Sampath K Gollapudi, Murali Chandra
Failing hearts of dilated cardiomyopathy (DCM)-patients reveal systolic dysfunction and upregulation of several Protein Kinase C (PKC) isoforms. Recently, we demonstrated that the functional effects of T204E, a PKC phosphomimic of cardiac troponin T (TnT), were differently modulated by α- and β-myosin heavy chain (MHC) isoforms. Therefore, we hypothesized that the interplay between the effects of T204E and a DCM-linked mutation (K211Δ or R206W) in TnT would modulate contractile parameters linked-to systolic function in an MHC-dependent manner...
June 2016: Journal of Muscle Research and Cell Motility
Jing Hu, Ting Guo, Wen-Qian Pan, Tian Gan, Jing Wei, Jun-Peng Wang, Xiang-Jun Leng, Xiao-Qin Li
Unc45 myosin chaperone b(unc45b)gene is a molecular chaperone that mediates the folding, assembly and accumulation of thick-filament myosin in the formation of sarcomere, which plays an important role in the development of striated muscle and the stability of sarcomere. In this study, the complete cDNA sequence of unc45b gene of grass carp was obtained by rapid amplification of cDNA ends (RACE), and the characteristics of the unc45b protein predicted from gene sequence was analyzed by bioinformatics methods...
June 2016: Journal of Muscle Research and Cell Motility
Pauline M Bennett, Elisabeth Ehler, Amanda J Wilson
In cardiomyocytes columns of intermyofibrillar mitochondria run up to the intercalated disc (ID); half are collinear with those in the neighbouring cell, suggesting coordinated addition of sarcomeres and mitochondria both within and between cells during cardiomyocyte growth. Recent evidence for an association between sarcoplasmic reticulum (SR) and mitochondria indicates that the SR may be an intermediary in this coordinated behaviour. For this reason we have investigated the arrangement of SR and t tubules with respect to mitochondria and myofibrils, particularly at the ID...
June 2016: Journal of Muscle Research and Cell Motility
Yutong Jin, Ying Peng, Ziqing Lin, Yi-Chen Chen, Liming Wei, Timothy A Hacker, Lars Larsson, Ying Ge
Mammalian skeletal muscles are heterogeneous in nature and are capable of performing various functions. Tropomyosin (Tpm) is a major component of the thin filament in skeletal muscles and plays an important role in controlling muscle contraction and relaxation. Tpm is known to consist of multiple isoforms resulting from different encoding genes and alternative splicing, along with post-translational modifications. However, a systematic characterization of Tpm isoforms in skeletal muscles is still lacking. Therefore, we employed top-down mass spectrometry (MS) to identify and characterize Tpm isoforms present in different skeletal muscles from multiple species, including swine, rat, and human...
April 2016: Journal of Muscle Research and Cell Motility
Ji-Xin Wu, Liang Chen, Fei Ding, Le-Zi Chen, Yu-Dong Gu
In obstetric brachial plexus palsy (OBPP), irreversible muscle atrophy occurs much faster in intrinsic muscles of the hand than in the biceps. To elucidate the mechanisms involved, mRNA expression profiles of denervated intrinsic muscles of the forepaw (IMF) and denervated biceps were determined by microarray using the rat model of OBPP where atrophy of IMF is irreversible while atrophy of biceps is reversible. Relative to contralateral control, 446 dysregulated mRNAs were detected in denervated IMF and mapped to 51 KEGG pathways, and 830 dysregulated mRNAs were detected in denervated biceps and mapped to 52 KEGG pathways...
April 2016: Journal of Muscle Research and Cell Motility
Kevin A Murach, James R Bagley, Kathryn A McLeland, Jose A Arevalo, Anthony B Ciccone, Kylie K Malyszek, Yuan Wen, Andrew J Galpin
Single muscle fiber sodium dodecyl sulfate polyacrylamide gel-electrophoresis (SDS-PAGE) is a sensitive technique for determining skeletal muscle myosin heavy chain (MHC) composition of human biopsy samples. However, the number of fibers suitable to represent fiber type distribution via this method is undefined. Muscle biopsies were obtained from the vastus lateralis (VL) of nine resistance-trained males (25 ± 1 year, height = 179 ± 5 cm, mass = 82 ± 8 kg). Single fiber MHC composition was determined via SDS-PAGE...
April 2016: Journal of Muscle Research and Cell Motility
Yulia N Lomonosova, Olga V Turtikova, Boris S Shenkman
Under muscle disuse conditions decrease of expression of MyHC of slow type, and sometimes of type IIa, as well as upregulation of expression of IIb and IId/x isoforms were observed. Through dephosphorylation and entry of NFAT molecules to the nucleus calcineurin/NFATc1 signaling pathway promotes upregulation of the slow MyHC expression. We supposed that downregulation of calcineurin pathway took place during unloading. The study was aimed to analyze the states of the myonuclear NFAT inhibitors calsarcin I (CSI) and calsarcin II (CSII) (also referred to as myozenin II and I) and GSK3β in rat soleus during hindlimb suspension (HS)...
April 2016: Journal of Muscle Research and Cell Motility
Sandra Furlan, Simone Mosole, Marta Murgia, Nagarjuna Nagaraj, Francesco Argenton, Pompeo Volpe, Alessandra Nori
Calsequestrin (Casq) is a high capacity, low affinity Ca(2+)-binding protein, critical for Ca(2+)-buffering in cardiac and skeletal muscle sarcoplasmic reticulum. All vertebrates have multiple genes encoding for different Casq isoforms. Increasing interest has been focused on mammalian and human Casq genes since mutations of both cardiac (Casq2) and skeletal muscle (Casq1) isoforms cause different, and sometime severe, human pathologies. Danio rerio (zebrafish) is a powerful model for studying function and mutations of human proteins...
April 2016: Journal of Muscle Research and Cell Motility
Yulia N Lomonosova, Olga V Turtikova, Boris S Shenkman
No abstract text is available yet for this article.
December 7, 2015: Journal of Muscle Research and Cell Motility
(no author information available yet)
No abstract text is available yet for this article.
December 2015: Journal of Muscle Research and Cell Motility
Magdalena Kozakowska, Katarzyna Pietraszek-Gremplewicz, Alicja Jozkowicz, Jozef Dulak
Reactive oxygen species (ROS) are generated in skeletal muscle both during the rest and contractile activity. Myogenic cells are equipped with antioxidant enzymes, like superoxide dismutase, catalase, glutathione peroxidase, γ-glutamylcysteine synthetase and heme oxygenase-1. These enzymes not only neutralise excessive ROS, but also affect myogenic regeneration at several stages: influence post-injury inflammatory reaction, enhance viability and proliferation of muscle satellite cells and myoblasts and affect their differentiation...
December 2015: Journal of Muscle Research and Cell Motility
Thomas P Burghardt, Xiaojing Sun, Yihua Wang, Katalin Ajtai
Myosin in muscle transduces ATP free energy into the mechanical work of moving actin. It has a motor domain transducer containing ATP and actin binding sites, and, mechanical elements coupling motor impulse to the myosin filament backbone providing transduction/mechanical-coupling. The mechanical coupler is a lever-arm stabilized by bound essential and regulatory light chains. The lever-arm rotates cyclically to impel bound filamentous actin. Linear actin displacement due to lever-arm rotation is the myosin step-size...
December 2015: Journal of Muscle Research and Cell Motility
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