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External and middle ear pathology in TGF-alpha-deficient animals
C G Wright1, K S Robinson, W L Meyerhoff
1Department of Otolaryngology, University of Texas Southwestern Medical Center, Dallas 75235-9035, USA.
The American Journal of Otology
|March 1, 1996
Summary
Transforming growth factor-alpha (TGF-alpha) deficiency causes ear pathology in mice, mimicking human cholesteatoma. This suggests TGF-alpha plays a role in the disease
Area of Science:
- Developmental Biology
- Otolaryngology
- Dermatology
Background:
- Transforming growth factor-alpha (TGF-alpha) is a peptide regulating growth, produced by keratinocytes.
- Overexpression of TGF-alpha is linked to epidermal diseases like middle ear cholesteatoma.
- The waved-1 mutant mouse exhibits a severe deficiency in TGF-alpha.
Purpose of the Study:
- To investigate ear pathology in waved-1 mutant mice with TGF-alpha deficiency.
- To explore the potential role of TGF-alpha in cholesteatoma pathogenesis.
Main Methods:
- Histological examination of external and middle ear structures in waved-1 mutant mice.
- Age range of study subjects: 2 weeks to 6.5 months.
Main Results:
- Mutants displayed epidermal hyperplasia of the external ear canal (EAC) and tympanic membrane (TM).
- Enlarged sebaceous glands adjacent to the EAC were observed.
- Accumulation of sebum and keratin in the EAC led to TM displacement into the middle ear.
Conclusions:
- The observed ear pathology in waved-1 mutants resembles cholesteatoma development in Mongolian gerbils.
- TGF-alpha deficiency may contribute to cholesteatoma pathogenesis.