2007年10月
Novel therapy for hearing loss: Delivery of insulin-like growth factor 1 to the cochlea using gelatin hydrogel
OTOLOGY & NEUROTOLOGY
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- 巻
- 28
- 号
- 7
- 開始ページ
- 976
- 終了ページ
- 981
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- 出版者・発行元
- LIPPINCOTT WILLIAMS & WILKINS
Hypothesis: Local application of recombinant human insulin-like growth factor I (rhIGF-1) via a biodegradable hydrogel after onset of noise-induced hearing loss (NIHL) can attenuate functional and histologic damage.
Background: The biodegradable gelatin hydrogel makes a complex with drugs by static electric charges and releases drugs by degradation of gelatin polymers. We previously demonstrated the efficacy of local rhIGF-1 application via hydrogels before noise exposure for prevention of NIHL.
Methods: First, we used an enzyme-linked immunosorbent assay to measure human IGF-1 concentrations in the cochlear fluid after placing a hydrogel containing rhIGF-1 onto the round window membrane of guinea pigs. Second, the functionality and the histology of guinea pig cochleae treated with local rhIGF-1 I application at different concentrations after noise exposure were examined. Control animals were treated with a hydrogel immersed in physiologic saline alone.
Results: The results revealed sustained delivery of rhIGF-1 into the cochlear fluid via the hydrogel. The measurement of auditory brainstem responses demonstrated that local rhIGF-1 treatment significantly reduced the threshold elevation from noise. Histologic analysis exhibited increased survival of outer hair cells by local rhlGF-1 application through the hydrogel.
Conclusion: These findings indicate that local rhlGF-1 treatment via gelatin hydrogels is effective for treatment of NIHL.
Background: The biodegradable gelatin hydrogel makes a complex with drugs by static electric charges and releases drugs by degradation of gelatin polymers. We previously demonstrated the efficacy of local rhIGF-1 application via hydrogels before noise exposure for prevention of NIHL.
Methods: First, we used an enzyme-linked immunosorbent assay to measure human IGF-1 concentrations in the cochlear fluid after placing a hydrogel containing rhIGF-1 onto the round window membrane of guinea pigs. Second, the functionality and the histology of guinea pig cochleae treated with local rhIGF-1 I application at different concentrations after noise exposure were examined. Control animals were treated with a hydrogel immersed in physiologic saline alone.
Results: The results revealed sustained delivery of rhIGF-1 into the cochlear fluid via the hydrogel. The measurement of auditory brainstem responses demonstrated that local rhIGF-1 treatment significantly reduced the threshold elevation from noise. Histologic analysis exhibited increased survival of outer hair cells by local rhlGF-1 application through the hydrogel.
Conclusion: These findings indicate that local rhlGF-1 treatment via gelatin hydrogels is effective for treatment of NIHL.
- リンク情報
- ID情報
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- ISSN : 1531-7129
- Web of Science ID : WOS:000249858400020