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Human extraocular muscles: unique pattern of myosin heavy chain expression during myotube formation
Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Anatomy. Department of Musculoskeletal Research, National Institute for Working Life, Umeå, Sweden.
Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Anatomy.
University of Sydney.
University of Sydney.
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2000 (English)In: Investigative Ophthalmology and Visual Science, ISSN 0146-0404, Vol. 41, no 7, 1608-1616 p.Article in journal (Refereed) Published
Abstract [en]

PURPOSE: To study the myosin heavy chain composition of the human extraocular muscles (EOMs) during development.

METHODS: EOMs from human fetuses of 8 to 22 weeks of gestation were studied with immunocytochemistry and gel electrophoresis. Antibodies specific against nine isoforms of myosin heavy chain (MyHC) were used in serial frozen sections.

RESULTS: The developing EOMs had a delayed time course of myotube formation and a unique composition and distribution of MyHCs compared with human limb skeletal muscle. The primary myotubes coexpressed two developmental isoforms of MyHCI from the earliest stages. The third developmental MyHCI delineated the future orbital layer at 10 to 12 weeks of gestation. MyHC-slow tonic also appeared early, whereas MyHC alpha-cardiac and MyHC-extraocular, important components of adult EOM, were never detected at the gestational ages studied.

CONCLUSIONS: The developmental features of the EOMs differed significantly from those reported for limb muscles of the corresponding ages. It is clear that the knowledge of limb muscle development does not fully apply to more specialized muscles, such as the eye muscles. The extreme complexity displayed by the EOMs probably reflects their distinct embryonic origin, innervation, and regulatory program of myogenesis.

Place, publisher, year, edition, pages
Association for Research in Vision and Ophthalmology , 2000. Vol. 41, no 7, 1608-1616 p.
National Category
Ophthalmology Other Basic Medicine
URN: urn:nbn:se:umu:diva-81930ISI: 000087387300002PubMedID: 10845576OAI: diva2:658874
Available from: 2013-10-23 Created: 2013-10-23 Last updated: 2013-12-13Bibliographically approved

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Pedrosa-Domellöf, FatimaHolmgren, YlvaThornell, Lars-Eric
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