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Cytoskeletal Proteins in Myotendinous Junctions of Human Extraocular Muscles
Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Anatomy.
Umeå University, Faculty of Medicine, Department of Clinical Sciences, Ophthalmology. Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Anatomy.
2021 (English)In: Investigative Ophthalmology and Visual Science, ISSN 0146-0404, E-ISSN 1552-5783, Vol. 62, no 2, p. 1-10Article in journal (Refereed) Published
Abstract [en]

Purpose: The purpose of this study was to investigate the cytoskeletal composition of myotendinous junctions (MTJs) in the human extraocular muscles (EOMs). Desmin and other major cytoskeletal proteins are enriched at the MTJs of ordinary myofibers, where they are proposed to be of particular importance for force transmission and required to maintain myofiber integrity. Methods: EOM and limb muscle samples were analyzed with immunohistochemistry using antibodies against the intermediate filament proteins desmin, nestin, keratin 19, vimentin, and different myosin heavy chain (MyHC) isoforms. MTJs were identified by labeling with antibodies against laminin or tenascin. Results: In contrast to MTJs in lumbrical muscle where desmin, nestin, and keratin 19 were always present, approximately one-third of the MTJs in the EOMs lacked either desmin and/or nestin, and all MTJs lacked keratin 19. Approximately 6% of the MTJs in the EOMs lacked all of these key cytoskeletal proteins. Conclusions: The cytoskeletal protein composition of MTJs in human EOMs differed significantly from that of MTJs in limb muscles. These differences in cytoskeletal protein composition may indicate particular adaptation to meet the functional requirements of the EOMs.

Place, publisher, year, edition, pages
ARVO journals , 2021. Vol. 62, no 2, p. 1-10
National Category
Ophthalmology
Identifiers
URN: urn:nbn:se:umu:diva-181570DOI: 10.1167/iovs.62.2.19ISI: 000624567800019Scopus ID: 2-s2.0-85101667975OAI: oai:DiVA.org:umu-181570DiVA, id: diva2:1538610
Available from: 2021-03-19 Created: 2021-03-19 Last updated: 2023-09-05Bibliographically approved

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Liu, Jing-XiaDomellöf, Fatima Pedrosa

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