Treatment of acute vocal fold scar with local injection of basic fibroblast growth factor: a canine study.
CONCLUSIONS
Results of the current study revealed improved phonation threshold pressure (PTP), normalized mucosal wave amplitude (NMWA), and less contraction of the lamina propria in injured larynges treated with basic fibroblast growth factor (bFGF).


OBJECTIVE
We investigated the effects of local injection of bFGF for treatment of acute vocal fold injury in a canine model.


METHODS
Vocal folds of eight beagles were unilaterally injured by removal of the mucosa under direct laryngoscopy. Four beagles received local injections of bFGF delivered to the scarred vocal fold at 1 month after injury. The remaining four beagles received local injections of saline and served as a sham-treatment group. Larynges were harvested 5 months after treatment and excised larynx experiments were performed to measure PTP, NMWA, and normalized glottal gap (NGG). Histologic staining was performed to evaluate structural changes of the extracellular matrix.


RESULTS
Excised larynx measurements revealed significantly lower PTP and increased NMWA in bFGF-treated vocal fold. Elastica Van Gieson staining revealed less contraction of the bFGF-treated vocal fold. Histologic measurements revealed that the thickness of the lamina propria was significantly greater in the bFGF-treated vocal fold. Alcian blue staining revealed improved restoration of hyaluronic acid in the bFGF-treated vocal fold.
Suehiro
Atsushi
A
Department of Otolaryngology-Head & Neck Surgery, Kyoto University, Japan.
Hirano
Shigeru
S
Kishimoto
Yo
Y
Rousseau
Bernard
B
Nakamura
Tatsuo
T
Ito
Juichi
J
D000818:Animals; D002921:Cicatrix / Q000628:therapy*; D004195:Disease Models, Animal; D004285:Dogs; D016222:Fibroblast Growth Factor 2 / Q000494:pharmacology*; D006820:Hyaluronic Acid / Q000378:metabolism; D007267:Injections; D008297:Male; D010699:Phonation; D011446:Prospective Studies; D014732:Vibration; D014827:Vocal Cords / Q000187:drug effects* / Q000293:injuries* / Q000378:metabolism
D016222:Fibroblast Growth Factor 2; D006820:Hyaluronic Acid