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[Study on TGF beta 1, TGF beta 2, TGF beta 3 expression in the chick basilar papilla following gentamicin toxicity]
Abstract:
The beta-type transforming growth factors (TGF beta s) are secreted proteins, which play an important role in regulation of cell proliferation and differentiation in the embryonic inner ear. In order to probe into the effect of TGF beta s on the hair cell regeneration, expression of TGF beta 1, TGF beta 2 and TGF beta 3 proteins were examined by using immunohistochemistry in the chicken basilar papilla during hair cell regeneration following gentamicin ototoxicity. Ten-day-old chickens received daily subcutaneous injection of gentamicin sulfate 50 mg/kg of ten consecutive days. The animals were allowed to survive 1,3,7,14,21 and 28 days before sacrifice and preparation for examination of the expression of TGF beta 1, TGF beta 2 and TGF beta 3 proteins. Immunostaining results demonstrated that TGF beta 2 and TGF beta 3 proteins were observed in the damaged region of basilar papilla. TGF beta 2 and TGF beta 3 proteins positive cells were limited to the lumenal nuclear layer within the damaged region. TGF beta 1 protein positive cell was not found in our study. These results indicated that TGF beta 2 and TGF beta 3 proteins might play a role in regulating proliferation of the supporting cells immigrated into the lumenal nuclear layer during hair cell regeneration.
Insights
Transforming growth factors (TGF beta s) are crucial for inner ear development. This study found TGF beta 2 and TGF beta 3 proteins involved in supporting cell proliferation during hair cell regeneration after gentamicin damage.
Area of Science:
- Developmental Biology
- Ototoxicology
- Cell Biology
Context:
- Beta-type transforming growth factors (TGF beta s) regulate cell proliferation and differentiation.
- Hair cell regeneration is critical for hearing restoration.
- Gentamicin ototoxicity is a common cause of hearing loss.
Purpose:
- To investigate the role of TGF beta 1, TGF beta 2, and TGF beta 3 in hair cell regeneration.
- To examine the expression of TGF beta proteins in the chicken basilar papilla following gentamicin-induced damage.
Summary:
- Immunohistochemistry was used to analyze TGF beta protein expression in the basilar papilla of chickens after gentamicin sulfate injections.
- TGF beta 2 and TGF beta 3 proteins were detected in the damaged region, specifically in the lumenal nuclear layer.
- TGF beta 1 protein was not found, suggesting TGF beta 2 and TGF beta 3 may regulate supporting cell proliferation during regeneration.
Impact:
- Provides insights into the molecular mechanisms of hair cell regeneration.
- Identifies potential therapeutic targets for treating hearing loss.
- Highlights the specific roles of TGF beta 2 and TGF beta 3 in auditory tissue repair.