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Journal of Cell Science, Vol 112, Issue 6 867-876, Copyright © 1999 by Company of Biologists

JOURNAL ARTICLES

Plectin is a linker of intermediate filaments to Z-discs in skeletal muscle fibers

T Hijikata, T Murakami, M Imamura, N Fujimaki and H Ishikawa
Department of Anatomy, Gunma University School of Medicine, Maebashi, Gunma 371-8511, Japan. hijikata@sb.gunma-u.ac.jp

Plectin is a versatile linker protein which is associated with various types of cytoskeletal components and/or filaments including intermediate filaments, and its deficiency causes the disruption of myofibrils, or muscular dystrophy. To better understand the functional role of plectin in skeletal muscle fibers, we have examined the topological and structural relationships of plectin to intermediate filaments and Z-discs in rat diaphragm muscles by confocal and immunoelectron microscopy. Immunofluorescence analysis revealed that plectin was colocalized with desmin at the periphery of Z-discs. This plectin localization around Z-discs was constantly maintained irrespective of the contracted or extended state of the muscle fibers, suggesting either direct or indirect association of plectin with Z-discs. Immunogold labeling in skinned muscle fibers clearly demonstrated that plectin-labeled fine threads linked desmin intermediate filaments to Z-discs and connected intermediate filaments to each other. These results indicate that through plectin threads desmin intermediate filaments form lateral linkages among adjacent Z-discs, preventing individual myofibrils from disruptive contraction and ensuring effective force generation.
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