Korean J Otorhinolaryngol-Head Neck Surg.  2013 Aug;56(8):506-510. 10.3342/kjorl-hns.2013.56.8.506.

Histologic Changes of Vocal Fold Aging in a Rat Model

Affiliations
  • 1Department of Otorhinolaryngology-Head and Neck Surgery, Inha University School of Medicine, Incheon, Korea. ymk416@inha.ac.kr, jylim@inha.ac.kr

Abstract

BACKGROUND AND OBJECTIVES
Aging causes atrophy in mucosa of vocal folds, resulting in various deleterious changes in phonation. Eventually, these changes impair an elderly individual's ability to communicate with others and affect their quality of life. This investigation was carried out to determine the morphological characteristics of vocal folds in two different aged groups of rats, and to perform a validation of a rat model of age-related changes in larynx.
SUBJECTS AND METHOD
Larynges were obtained from 12 rats, of which 6 rats were 6 months old and the others 18 months old. The middle portion of each vocal folds were stained with haematoxylin and eosin (H&E), Masson's trichrome (MT), Alcian blue (AB) and compared.
RESULTS
Extracellular matrix in lamina propria of vocal folds presented lower density in 18 months-old rats than in 6 months-old rats (p<0.05). Also more severe fibrosis was observed in 18 months-old rats than in 6 months-old rats (p<0.05). Six months-old rats showed higer concentration of hyaluronic acid than did 18 months-old rats (p<0.05).
CONCLUSION
Aged vocal folds showed increased fibrosis and decreased density of collagen and hyaluronic acids in the lamina propria compared to young vocal fold.

Keyword

Aging; Extracellular matrix; Hyaluronic acid; Lamina propria; Larynx; Vocal cord

MeSH Terms

Aged
Aging
Alcian Blue
Animals
Atrophy
Collagen
Eosine Yellowish-(YS)
Extracellular Matrix
Fibrosis
Hyaluronic Acid
Larynx
Mucous Membrane
Phonation
Quality of Life
Rats
Vocal Cords
Alcian Blue
Collagen
Eosine Yellowish-(YS)
Hyaluronic Acid
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