Single Administration of a Sustained-Release Formulation of KB-R7785 Inhibits Tympanic Membrane Regeneration in an Animal Model
Department of Otolaryngology, Head and Neck Surgery, Stanford University, California, USA
Department of Ear Sciences, The University of Western Australia, Western Australia, AUS; The Ear Science Institute, Western Australia, AUS
Department of Orthopedic Surgery, Stanford University, California, USA
Department of Orthopedic Surgery, Stanford University, California, USA; Department of Materials Science and Engineering, Stanford University, California, USA
J Int Adv Otol 2016; 12: 237-240
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Key Words: Tympanic membrane, chronic perforation, tympanic perforation, wound healing
OBJECTIVE: A pressure equalization tube placed within the tympanic membrane is the only clinically available method for inhibiting tympanic membrane regeneration. Problems associated with this include associated otorrhea, biofilm formation, medial migration of the tube, tube retention, induction of granulation tissue, and a small but significant rate of cholesteatoma. We aimed to demonstrate that a single administration of a sustained-release polymer formulation of KB-R7785 maintains tympanic membrane perforation for at least 6 months.
MATERIALS and METHODS: Sustained-release KB-R7785 was delivered within a novel polymer hydrogel to 20 mice with bilateral acute tympanic membrane perforations (a total of 40 perforations). The perforations were monitored at 3-month intervals until 9 months.
RESULTS: At 3 months, 90% of perforations were open (n=36/40). At 6 months, 75% of perforations were open (total n=30/40). At 9 months, 22.5% of perforations were open (total n=6/40). The majority of tympanic membrane perforations (75%) were open (not healed) beyond 6 months and close (fully healed) prior to 9 months (77.5%). Once healed, tympanic membranes resembled their normal histological appearance.
CONCLUSION: This study demonstrates that a single administration of a sustained-release polymer formulation of KB-R7785 inhibits tympanic membrane regeneration for 6–9 months.