Effect of Dystrophin Deficiency on Selected Intrinsic Laryngeal Muscles of the mdx Mouse Background: Intrinsic laryngeal muscles (ILM) show biological differences from the broader class of skeletal muscles. Yet most research regarding ILM specialization has been completed on a few muscles, most notably the thyroarytenoid and posterior cricoarytenoid. Little information exists regarding the biology of other ILM. Early evidence suggests that the ... Research Note
Research Note  |   June 2010
Effect of Dystrophin Deficiency on Selected Intrinsic Laryngeal Muscles of the mdx Mouse
 
Author Affiliations & Notes
  • Lisa T. Fry
    Marshall University, Huntington, WV
  • Joseph C. Stemple
    University of Kentucky, Lexington
  • Richard D. Andreatta
    University of Kentucky, Lexington
  • Anne L. Harrison
    University of Kentucky, Lexington
  • Francisco H. Andrade
    University of Kentucky, Lexington
  • Contact author: Lisa T. Fry, Department of Communication Disorders, Marshall University, 1 John Marshall Drive, Huntington, WV 25755. E-mail: thomasl@marshall.edu.
  • © 2010 American Speech-Language-Hearing AssociationAmerican Speech-Language-Hearing Association
Article Information
Speech, Voice & Prosody / Speech
Research Note   |   June 2010
Effect of Dystrophin Deficiency on Selected Intrinsic Laryngeal Muscles of the mdx Mouse
Journal of Speech, Language, and Hearing Research, June 2010, Vol. 53, 633-647. doi:10.1044/1092-4388(2009/09-0010)
History: Received January 23, 2009 , Accepted September 1, 2009
 
Journal of Speech, Language, and Hearing Research, June 2010, Vol. 53, 633-647. doi:10.1044/1092-4388(2009/09-0010)
History: Received January 23, 2009; Accepted September 1, 2009

Background: Intrinsic laryngeal muscles (ILM) show biological differences from the broader class of skeletal muscles. Yet most research regarding ILM specialization has been completed on a few muscles, most notably the thyroarytenoid and posterior cricoarytenoid. Little information exists regarding the biology of other ILM. Early evidence suggests that the interarytenoid (IA) and cricothyroid (CT) may be more similar to classic skeletal muscle than their associated laryngeal muscles. Knowledge of the IA and CT’s similarity or dissimilarity to typical skeletal muscle may hold implications for the treatment of dysphonia.

Purpose: The purpose of this study was to further define IA and CT biology by examining their response to the biological challenge of dystrophin deficiency.

Method: Control and dystrophin-deficient superior cricoarytenoid (SCA; mouse counterpart of IA) and CT muscles were examined for fiber morphology, sarcolemmal integrity, and immunohistochemical detection of dystrophin.

Results: Despite the absence of dystrophin, experimental muscles did not show disease markers.

Conclusions: The SCA and the CT appear spared in dystrophin-deficient mouse models. These laryngeal muscles possess specializations that separate them from typical skeletal muscle. Considered in light of previous research, the CT and IA may represent transitional form of muscle, evidencing properties of typical and specialized skeletal muscle.

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