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Effects of aging on thyroarytenoid muscle regeneration
Author(s) -
Lee Kyungah,
Kletzien Heidi,
Connor Nadine P.,
Schultz Edward,
Chamberlain Connie S.,
Bless Diane M.
Publication year - 2012
Publication title -
the laryngoscope
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.181
H-Index - 148
eISSN - 1531-4995
pISSN - 0023-852X
DOI - 10.1002/lary.23589
Subject(s) - regeneration (biology) , mitotic index , anatomy , medicine , biology , mitosis , microbiology and biotechnology
Objectives/Hypothesis: Regenerative properties of age‐associated changes in the intrinsic laryngeal muscles following injury are unclear. The purpose of this study was to investigate the regenerative properties of the thyroarytenoid (TA) muscle in an aging rat model. The hypothesis was that following myotoxic injury, old animals would exhibit a decrease in mitotic activities of muscle satellite cells when compared with younger rats, suggesting reduced regenerative potential in the aging rat TA muscle. Study Design: Animal group comparison. Methods: Regeneration responses following injury to the TA muscle were examined in 18 young adult, middle‐aged, and old Fischer 344/Brown Norway rats. TA muscle fiber cross‐sectional area (CSA), satellite cell mitosis (number/fiber), and regeneration index (CSA injured side/CSA noninjured side) were measured and compared across age groups. Results: Young adult animals had a significantly higher regeneration index than the middle‐aged and old groups. Within the lateral region of the TA muscle (LTA), the regeneration index was significantly higher in the young adult animals than in the middle‐aged and old animals. The regeneration index of the medial TA was significantly higher than the LTA across all age groups. Conclusions: The regenerative capacity of the TA muscle is impaired with increasing age. Laryngoscope, 2012