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Round window membrane permeability to transforming growth factor-alpha: an in vitro study
1Department of Otorhinolaryngology, Mayo Clinic and Mayo Foundation, Rochester, MN 55905, USA.
Summary
Transforming growth factor-alpha (TGF-alpha) can regenerate mammalian cochlear hair cells. This study shows TGF-alpha passes through the round window membrane (RWM), suggesting potential for hearing recovery treatments.
Area of Science:
- Otolaryngology
- Regenerative Medicine
- Auditory Physiology
Background:
- Transforming growth factor-alpha (TGF-alpha) promotes mammalian hair cell regeneration after ototoxic injury.
- Growth factor-augmented regeneration may improve cochlear function recovery.
- Transtympanic delivery to the round window membrane (RWM) is a viable drug route.
Purpose of the Study:
- To evaluate the permeability of the mammalian RWM to TGF-alpha.
- To establish an in vitro model for RWM permeability studies.
Main Methods:
- Harvested guinea pig RWM tissues were placed in a 2-chamber apparatus.
- TGF-alpha was applied to the middle-ear side, and concentrations were measured via ELISA over 96 hours.
Main Results:
- TGF-alpha permeated the RWM within 96 hours.
- Detected TGF-alpha concentrations were sufficient to stimulate hair cell regrowth.
Conclusions:
- TGF-alpha can pass through the mammalian RWM.
- This in vitro model facilitates RWM physiology and permeability research.
