Details

Autor(en) / Beteiligte

• Aires, Mateus M.
• Oliveira, Karine V. G.
• Amaral, Jônatas B.
• Mônico‐Neto, Marcos
• Martins, João Roberto M.
• Santiago, Aline L.
• De Biase, Noemi G.

Titel

Effect of Testosterone on the Thyroarytenoid Muscle and Lamina Propria of Female Rat Vocal Folds

Ist Teil von

• The Laryngoscope, 2024-05, Vol.134 (5), p.2316-2321

Ort / Verlag

Hoboken, USA: John Wiley & Sons, Inc

Erscheinungsjahr

2024

Link zum Volltext

Quelle

MEDLINE

Beschreibungen/Notizen

• Objective To analyze the effects of androgen therapy on the thyroarytenoid (TA) muscle, expression of androgen receptors (ARs) and hyaluronic acid (HA) concentration in the vocal folds (VFs) of adult female rats. Methods Twenty‐one adult female Wistar rats were divided into experimental and control groups. The experimental group received weekly intramuscular injections of nandrolone decanoate for 9 weeks. Following euthanasia and dissection of the VFs, histomorphometric analysis of the TA muscle, immunohistochemical evaluation of ARs, and measurement of HA concentration using the ELISA‐like fluorimetric method were performed. Results The experimental group exhibited a significantly larger mean fiber cross‐sectional area in the TA muscle compared to the control group (434.3 ± 68.6 μm2 versus 305.7 ± 110.1 μm2; p = 0.029), indicating muscle hypertrophy. There was no significant difference in the number of muscle fibers. The experimental group showed higher expression of ARs in the lamina propria (62.0% ± 30.3% versus 22.0% ± 22.8%; p = 0.046) and in the TA muscle (45.0% ± 22.6% versus 18.3% ± 9.8%; p = 0.024). There was no significant difference in the concentration of HA. Conclusion Exposure of adult female rats to androgen therapy resulted in hypertrophy of the TA muscle and increased expression of ARs in the VFs. The TA muscle seems to be the primary target of testosterone action in the VF, and the up‐regulation of ARs might contribute to the persistent deepening of the voice. Level of Evidence NA Laryngoscope, 134:2316–2321, 2024 Exposure of adult female rats to androgen therapy resulted in hypertrophy of the thyroarytenoid (TA) muscle and increased expression of androgen receptors in the vocal folds. The TA muscle seems to be the primary target of testosterone action in the larynx, and the up‐regulation of androgen receptors may contribute to the permanent deepening of the voice.