Chronic vocal fold scar restoration with hepatocyte growth factor hydrogel |
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Authors: | Yo Kishimoto MD Shigeru Hirano MD PhD Yoshiharu Kitani MD Atsushi Suehiro MD Hiroo Umeda MD PhD Ichiro Tateya MD PhD Shin‐ichi Kanemaru MD PhD Yasuhiko Tabata PhD DMedSci DPharm Juichi Ito MD PhD |
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Affiliation: | 1. Department of Otolaryngology–Head and Neck Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan;2. Department of Otolaryngology, Vanderbilt University Bill Wilkerson Center for Otolaryngology and Communication Sciences, Nashville, Tennessee, U.S.A.;3. Department of Otolaryngology, Head and Neck Surgery, Kitano Hospital, Tazuke Kofukai Medical Research Institute, Osaka, Japan;4. Department of Biomaterials, Field of Tissue Engineering, Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan |
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Abstract: | Objectives/Hypothesis: Therapeutic challenges exist in the management of vocal fold scarring. We have previously demonstrated the therapeutic potential of hepatocyte growth factor (HGF) in the management of acute phase vocal fold scarring using a novel hydrogel‐based HGF drug delivery system (DDS). However, the effect of HGF on matured vocal fold scarring remains unclear. The current study aims to investigate the effect of HGF‐DDS on chronic vocal fold scarring using a canine model. Study Design: Animal model. Methods: Vocal folds from eight beagles were unilaterally scarred by stripping the entire layer of the lamina propria; contralateral vocal folds were kept intact as normal controls. Six months after the procedures, hydrogels (0.5 mL) containing 1 μg of HGF were injected into the scarred vocal folds of four dogs (HGF‐treated group). Hydrogels containing saline solution were injected into the other four dogs (sham group). Histological and vibratory examinations on excised larynges were completed for each group 9 months after the initial surgery. Results: Experiments conducted on excised larynges demonstrated significantly better vibrations in the HGF‐treated group in terms of mucosal wave amplitude. Although phonation threshold pressure was significantly lower in the HGF‐treated group compared with the sham group, no significant differences were observed in the normalized glottal gap between HGF‐treated and sham groups. Histological examinations of the HGF‐treated vocal folds showed reduced collagen deposition and less tissue contraction with favorable restoration of hyaluronic acid. Conclusions: Results suggest that administration of HGF may have therapeutic potential in the treatment of chronic vocal fold scarring. Laryngoscope, 2010 |
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Keywords: | Chronic vocal fold scarring drug delivery system hepatocyte growth factor |
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