|
|
|
|
 |
|||
|
|||
Volume 52 (5): 581-590, 2004
Copyright ©The Histochemical Society, Inc.
Fiber Types in Rat Laryngeal Muscles and Their Transformations After Denervation and Reinnervation
Department of Physiology and Institute for Biomedical Research, School of Medical Sciences, Faculty of Medicine, University of Sydney, New South Wales, Australia
Correspondence to: Dr. J. F. Y. Hoh, Dept. of Physiology, Bldg F13, University of Sydney, Sydney, NSW 2006, Australia. E-mail: joeh{at}physiol.usyd.edu.au
The intrinsic laryngeal muscles cricothyroid (CT) and thyroarythenoid (TA) differ in myosin expression. CT expresses limb myosin heavy chains (MyHCs) and TA expresses an MyHC found in extraocular (EO) muscles, in addition to limb isoforms. We used immunohistochemical (IHC) analyses with highly specific monoclonal antibodies (MAbs) against various MyHCs to study muscle fiber types in rat CT and TA and to investigate whether nerves to laryngeal muscles control MyHC expression. CT was found to have the full complement of limb fiber types. TA had three major fiber types: 2b/eo, co-expressing 2B and EO MyHCs, 2x/2b, co-expressing 2X and 2B MyHCs, and 2x, expressing 2X MyHC. Type 2a and slow fibers were absent. TA consisted of two divisions: the external division (TA-X), which is homogeneously 2b/eo, and the vocalis division (TA-V), composed principally of 2x and 2b/eo fibers with a minority of 2x/2b fibers. TA-V had two compartments that differ in fiber type composition. At 4 weeks after cutting and re-uniting the recurrent laryngeal nerve (RLN), many 2b/eo fibers in the TA-X began to express 2X MyHC, while EO and 2B MyHC expression in these fibers progressively declined. By 12 weeks, up to 16.5% of fibers in the TA-X were of type 2x. These findings suggest that nerve fibers originally innervating 2x fibers in TA-V and other muscles have randomly cross-innervated 2b/eo fibers in the TA-X and converted them into 2x fibers. We conclude that CT and TA are distinct muscle allotypes and that laryngeal muscle fibers are subject to neural regulation.
(J Histochem Cytochem 52:581–590, 2004)
Key Words: muscle fiber • myosin heavy chain • neuronal modulation
CiteULike 
Complore 
Connotea 
Del.icio.us 
Digg 
Reddit 
Technorati What's this?
This article has been cited by other articles:
|
|
 |
|
  H. S. Rhee and J. F.Y. Hoh Immunohistochemical Analysis of Myosin Heavy Chain Expression in Laryngeal Muscles of the Rabbit, Cat, and Baboon J. Histochem. Cytochem., October 1, 2008; 56(10): 929 - 950. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 L. B. Thomas, G. L. Joseph, T. D. Adkins, F. H. Andrade, and J. C. Stemple Laryngeal Muscles Are Spared in the Dystrophin Deficient mdx Mouse J Speech Lang Hear Res, June 1, 2008; 51(3): 586 - 595. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 C. M. Adreani, Z. B. Li, M. Lehar, L. L. Southwood, P. L. Habecker, P. W. Flint, and E. J. Parente Myosin heavy chain composition in normal and atrophic equine laryngeal muscle. Vet. Pathol., November 1, 2006; 43(6): 881 - 889. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
N. V. Welham, G. Marriott, and D. M. Bless Proteomic profiling of rat thyroarytenoid muscle. J Speech Lang Hear Res, June 1, 2006; 49(3): 671 - 685. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. Bergrin, S. Bicer, C. A. Lucas, and P. J. Reiser Three-dimensional compartmentalization of myosin heavy chain and myosin light chain isoforms in dog thyroarytenoid muscle Am J Physiol Cell Physiol, May 1, 2006; 290(5): C1446 - C1458. [Abstract] [Full Text] [PDF]
|
|
| Guidelines | Subscriptions | About | exPRESS - Current - Archive | Business Information | Contact |