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[Transforming growth factor-beta (TGF-beta) inhibits epithelial wound healing of organ-cultured rabbit cornea]
1Department of Ophthalmology, Kyoto Prefectural University of Medicine, Japan.
Abstract:
Transforming growth factor-beta (TGF-beta) is a unique polypeptide growth factor which has been found to stimulate mesenchymal cell proliferation and inhibit epithelial cell growth. Whether or not TGF-beta inhibits corneal epithelial wound closure remains controversial. This study evaluated the effects of TGF-beta on corneal epithelial wound healing in vitro. Rabbit corneas with an artificial 8 mm epithelial defect were organ-cultured for 48 hr in TC-199 supplemented with TGF-beta (100 pg/ml, 1 ng/ml, or 10 ng/ml). The contralateral eye served as control. TGF-beta at 1 ng/ml and 10 ng/ml concentrations showed significant decrease in wound-healing rate compared with the control. 5-bromo-2'-deoxyuridine-immunohistochemistry showed a significant decrease in S-phase cell count in the 1 ng/ml group compared with the control. These results strongly suggest that TGF-beta inhibits corneal epithelial wound healing.
Insights
Transforming growth factor-beta (TGF-beta) inhibits corneal epithelial wound healing. This study found that higher TGF-beta concentrations significantly slowed the healing rate in rabbit corneas.
Area of Science:
- Ophthalmology
- Cell Biology
- Wound Healing Research
Context:
- Transforming growth factor-beta (TGF-beta) is known to influence cell proliferation, stimulating mesenchymal cells while inhibiting epithelial cells.
- The specific role of TGF-beta in corneal epithelial wound closure has been a subject of ongoing scientific debate.
- Understanding growth factor roles is crucial for developing effective ocular surface treatments.
Purpose:
- To investigate the in vitro effects of TGF-beta on the rate of corneal epithelial wound healing.
- To determine if TGF-beta concentrations influence cell proliferation during the wound healing process.
Summary:
- Rabbit corneas with induced epithelial defects were organ-cultured with varying concentrations of TGF-beta (100 pg/ml, 1 ng/ml, 10 ng/ml).
- A significant reduction in corneal epithelial wound healing rate was observed at TGF-beta concentrations of 1 ng/ml and 10 ng/ml compared to controls.
- 5-bromo-2'-deoxyuridine immunohistochemistry revealed a decreased S-phase cell count in the 1 ng/ml TGF-beta group, indicating reduced cell proliferation.
Impact:
- These findings provide strong evidence that TGF-beta inhibits corneal epithelial wound healing.
- The results suggest potential therapeutic implications for managing corneal injuries and diseases.
- Further research could explore TGF-beta antagonists for promoting corneal repair.