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  • 1
    Electronic Resource
    Electronic Resource
    Differences in the distribution of synemin, paranemin, and plectin in skeletal muscles of wild-type and desmin knock-out mice (2000)
    Springer
    Histochemistry and cell biology 114 (2000), S. 39-47 
    Details
    ISSN: 1432-119X
    Keywords: Cytoskeleton Desmin knock-out mice Intermediate filament-associated proteins Myotendinous junctions Neuromuscular junctions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. Mice lacking the gene encoding for the intermediate filament protein desmin have a surprisingly normal myofibrillar organization in skeletal muscle fibers, although myopathy develops in highly used muscles. In the present study we examined how synemin, paranemin, and plectin, three key cytoskeletal proteins related to desmin, are organized in normal and desmin knock-out (K/O) mice. We show that in wild-type mice, synemin, paranemin, and plectin were colocalized with desmin in Z-disc-associated striations and at the sarcolemma. All three proteins were also present at the myotendinous junctions and in the postsynaptic area of motor endplates. In the desmin K/O mice the distribution of plectin was unaffected, whereas synemin and paranemin were partly affected. The Z-disc-associated striations were in general no longer present in between the myofibrils. In contrast, at the myotendinous and neuromuscular junctions synemin and paranemin were still present. Our study shows that plectin differs from synemin and paranemin in its binding properties to the myofibrillar Z-discs and that the cytoskeleton in junctional areas is particularly complex in its organization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004180000158
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  • 2
    Electronic Resource
    Electronic Resource
    Mitoskelin: A mitochondrial protein found in cytoskeletal preparations (1989)
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 13 (1989), S. 274-287 
    Details
    ISSN: 0886-1544
    Keywords: complex I ; mitochondria ; bovine cardiac muscle ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: A 70 kD protein, which we have named mitoskelin, is highly enriched in cytoskeletal preparations from bovine cardiac muscle. Mitoskelin has three main variants with isoelectric points between 5.6 and 5.8. Immunoblotting with polyclonal antibodies directed against mitoskelin shows that, like intermediate filament proteins, the majority of mitoskelin resists solubilization from a myocardial homogenate by a series of extraction solutions ranging from very low salt to 0.6 M KI buffers and by 0.1-1% Nonidet P-40 detergent. By double-label immunofluorescence on cells and tissues, mitoskelin is colocalized with the mitochondrial marker cytochrome c oxidase. Mitoskelin is associated with the inner membranes of mitochondria as shown by immunoelectron microscopy and immunoblotting Immunological cross-reactivity and similarities of molecular weight, pI, distribution, and chromatographic properties indicate that mitoskelin is the 70 kD component of complex I (NADH: ubiquinone oxidoreductase), a portion of the mitochondrial oxidative phosphorylation system. No function or activity has yet been demonstrated for the 70 kD component of the 25-polypeptide complex I. Dialysis against physiological buffers allows purified, urea-solubilized mitoskelin to form 10 nm wide filamentous structures that do not closely resemble intermediate filaments. These results suggest the exciting possibility that mitochondria may contain a membrane-associated filamentous skeleton.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cm.970130406
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  • 3
    Electronic Resource
    Electronic Resource
    Different temporal patterns of expression result in the same type, amount, and distribution of filamin (ABP) in cardiac and skeletal myofibrils (1994)
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 27 (1994), S. 248-261 
    Details
    ISSN: 0886-1544
    Keywords: myogenesis ; protein isoforms ; muscle types ; Z-disc ; phosphorylation ; chicken muscle ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The morphogenesis of functional myofibrils in chick skeletal and cardiac muscle occurs in greatly different time spans, in about 7 and 2 days, respectively. In chick skeletal myogenic cells, one isoform of the 250 kD actin-binding protein (ABP) filamin is associated with stress fiber-like structures of myoblasts and early myotubes, then disappears for approximately 4 days, whereupon a second filamin isoform reappears at the Z-disc periphery. We sought to determine if cardiac myogenesis involves this sequence of appearance, disappearance, and reappearance of a new filamin isoform in a compressed time scale. It was known that in mature heart, filamin is localized at the Z-disc periphery as in mature (fast) skeletal muscle, and is also associated with intercalated discs. We find that myocardial filamin has an apparent molecular weight similar to that of adult skeletal muscle filamin and lower than that of smooth muscle filamin, and that both skeletal and cardiac muscle contain roughly 200 filamin monomers per sarcomere. Two-dimensional peptide mapping shows that myocardial filamin is very similar to skeletal muscle filamin. Myocardial, slow skeletal, and fast skeletal muscle filamins are all phosphorylated, as previously shown for filamin of non-striated muscle. Using immunofluorescence, we found that filamin could not be detected in the developing heart until the 14-somite stage, when functional myofibrils exist and the heart has been beating for 3 to 4 hours. We conclude that in cardiac and skeletal myogenesis, different sequences of filamin gene expression result in myofibrils with similar filamin distributions and isoforms. © 1994 Wiley-Liss, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cm.970270306
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  • 4
    Electronic Resource
    Electronic Resource
    Reduction of density and anisotropic distribution of intermediate filaments occur during avian skeletal myogenesis (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    American Journal of Anatomy 171 (1984), S. 427-440 
    Details
    ISSN: 0002-9106
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Chicken skeletal muscle taken from embryos in ovo was examined by thin-section electron microscopy. Measurements of filament diameters reveal three nonoverlapping groups of filaments: thin (actin myofibrillar) filaments with mean diameters of 5.3 ± 0.6 nm (S.D.), thick (myosin myofibrillar) filaments with mean diameters of 15 ± 1.4 nm, and intermediate filaments with mean diameters of 9.3 ± 0.9 nm. During muscle development these diameters do not change. By counting the number of filaments observed in the sarcoplasm at different stages, we find that the spatial density of intermediate filaments decreases during avian myogenesis in ovo, from 91 intermediate filaments/μm2 at 6 days to 43 intermediate filaments/μm2 at 17 days in ovo. Initially randomly arranged, some intermediate filaments become associated with Z discs, sarcoplasmic reticulum, nuclear membrane, and the sarcolemma between 6 and 10 days in ovo. These associated intermediate filaments course both parallel and transverse to myofibrils, forming lateral connections between myofibrillar Z discs and longitudinal connections from Z disc to Z disc within myofibrils. Intermediate filaments also appear to connect Z discs with the nuclear membrane. The intermediate filament associations persist through day 17 of development, after which the presence of cytoskeletal filaments is obscured by the densely packed myofibrils and membranes. Intermediate filament distribution becomes anisotropic during development. A greater proportion of intermediate filaments in the immediate perimyofibrillar area are oriented parallel to myofibrils than in other areas, so that the majority of the intermediate filaments nearest the myofibrils course parallel to them. The longitudinal intramyofibrillar intermediate filaments persist throughout development, as shown by their existence in KI-extracted adult myofibrils.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aja.1001710407
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