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The effect of transforming growth factor-alpha (TGF alpha) on rabbit and primate lens epithelial cells in vitro
1Kabi Pharmacia Ophthalmics, Department of Biology, Uppsala, Sweden.
Abstract:
TGF alpha, a member of the epidermal growth factor family stimulates proliferation of various cells. In the search for molecules that regulate cell division in the lens epithelium, the effect of numerous growth factors including EGF and FGF has been determined. In this study, the effect of TGF alpha on lens epithelial cells (LEC) from rabbit and monkey was investigated and compared to FGF and EGF. Since TGF alpha is suggested to be a factor that is regulated by auto and/or paracrine mechanisms, an immunohistochemical visualisation of the factor in the rabbit lens in situ was performed. TGF alpha stimulates LEC in a dose-dependent manner with a maximal threefold increase in cellular proliferation at 100 ng/ml. At a concentration above 10 ng/ml the cells lost their epithelial morphology and became irregular and star-shaped. Since TGF alpha is a potent LEC mitogen and has shown to increase in aqueous humour after trauma to the eye, this factor might be one of the molecules that regulate normal cell division in the ocular lens as well as LEC growth after cataract surgery.
Insights
Transforming growth factor alpha (TGF-α) significantly boosts lens epithelial cell (LEC) proliferation in a dose-dependent manner. This potent mitogen may regulate normal ocular lens cell division and post-injury LEC growth.
Area of Science:
- Ophthalmology
- Cell Biology
- Molecular Biology
Background:
- Cell proliferation in the lens epithelium is crucial for ocular health.
- Growth factors like EGF and FGF are known regulators of cell division.
- Transforming growth factor alpha (TGF-α), part of the epidermal growth factor family, is investigated for its role in cell proliferation.
Purpose of the Study:
- To investigate the effect of TGF-α on rabbit and monkey lens epithelial cells (LECs).
- To compare the mitogenic effects of TGF-α with FGF and EGF on LECs.
- To visualize TGF-α in the rabbit lens in situ to understand its regulatory mechanisms.
Main Methods:
- Dose-dependent proliferation assays using rabbit and monkey LECs.
- Comparison of TGF-α with FGF and EGF effects.
- Immunohistochemical staining for TGF-α visualization in rabbit lenses.
Main Results:
- TGF-α stimulated LEC proliferation in a dose-dependent manner, with maximum effect at 100 ng/ml.
- A threefold increase in cellular proliferation was observed at optimal TGF-α concentrations.
- At concentrations above 10 ng/ml, TGF-α induced morphological changes in LECs, leading to irregular, star-shaped cells.
Conclusions:
- TGF-α is a potent mitogen for lens epithelial cells.
- TGF-α may play a role in regulating normal cell division in the ocular lens.
- Increased TGF-α levels post-eye trauma suggest its involvement in LEC growth and repair, potentially after cataract surgery.