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Thyroxine treatments do not correct inner ear defects in tmprss1 mutant mice
Syazana Hanifa1, Hamish S Scott, Pauline Crewther
1The Bionic Ear Institute, University of Melbourne, East Melbourne, Victoria, Australia.
Neuroreport
|August 5, 2010
Summary
Complete deficiency of transmembrane serine protease 1 (TMPRSS1) causes hearing loss and tectorial membrane defects. Treated mice showed no improvement, indicating impaired thyroxine response in the inner ear.
Area of Science:
- Genetics
- Otolaryngology
- Developmental Biology
Background:
- TMPRSS1 (hepsin) deficiency causes severe hearing loss and cochlear malformations in mice.
- These mice exhibit significantly reduced thyroxine levels compared to wild-type.
- Thyroxine is crucial for normal inner ear development.
Purpose of the Study:
- To investigate the role of TMPRSS1 in inner ear development.
- To determine if thyroxine supplementation can rescue hearing loss and cochlear deformities in TMPRSS1-deficient mice.
Main Methods:
- Generated TMPRSS1-deficient mice.
- Administered thyroxine during prenatal and postnatal development.
- Assessed hearing function and tectorial membrane morphology.
Main Results:
- TMPRSS1 deficiency led to severe to profound hearing loss and enlarged tectorial membranes.
- Thyroxine treatment, whether prenatal or postnatal, failed to ameliorate hearing loss or correct tectorial membrane deformities.
- This suggests an intrinsic defect in thyroxine responsiveness in the inner ear of TMPRSS1-deficient mice.
Conclusions:
- TMPRSS1 is essential for normal inner ear development and auditory function.
- Inner ear development in TMPRSS1-deficient mice is unresponsive to thyroxine supplementation.
- TMPRSS1 deficiency likely impairs the inner ear's ability to respond to thyroxine in vivo.
