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Mitogenic effects of epidermal growth factor and transforming growth factor-alpha on EGF-receptor positive human
A J Crew1, S P Langdon, E P Miller
1ICRF Medical Oncology Unit, Western General Hospital, Edinburgh, U.K.
Abstract:
The role of epidermal growth factor (EGF) and transforming growth factor-alpha (TGF-alpha) in the growth modulation of three human ovarian adenocarcinoma cell lines, PEO1, PEO4 and PEO14, has been examined by measuring responses of the cells growing in monolayer culture to exogenous addition of the growth factors. The presence of EGF receptors in the cell lines has been confirmed by ligand binding and immunocytochemical staining using a monoclonal antibody directed against the EGF receptor. The growth of all three cell lines was stimulated by both EGF and TGF-alpha. Dose-response effects were noted with the greatest growth stimulation occurring at concentrations between 0.1 and 10 nmol/l. The stimulatory effects of EGF and TGF-alpha were accompanied by changes in the cell cycle distribution as detected by flow cytometric analysis. It is concluded that EGF and TGF-alpha are important growth regulators in these EGF-receptor positive ovarian cancer cells.
Insights
Epidermal growth factor (EGF) and transforming growth factor-alpha (TGF-alpha) significantly stimulate ovarian cancer cell growth. These growth factors are key regulators in EGF-receptor positive ovarian cancer.
Area of Science:
- Oncology
- Cell Biology
- Molecular Biology
Background:
- Ovarian adenocarcinoma cell lines (PEO1, PEO4, PEO14) were investigated for their response to growth factors.
- The presence of epidermal growth factor (EGF) receptors was confirmed in these cell lines.
Purpose of the Study:
- To examine the role of EGF and transforming growth factor-alpha (TGF-alpha) in modulating the growth of human ovarian adenocarcinoma cells.
- To determine if EGF and TGF-alpha influence cell cycle distribution.
Main Methods:
- Cells were cultured in monolayers and treated with exogenous EGF and TGF-alpha.
- Ligand binding assays and immunocytochemical staining were used to confirm EGF receptor presence.
- Flow cytometry analyzed cell cycle distribution changes.
Main Results:
- Both EGF and TGF-alpha demonstrated a stimulatory effect on the growth of all three ovarian cancer cell lines.
- Optimal growth stimulation was observed at concentrations ranging from 0.1 to 10 nmol/l.
- Stimulatory effects correlated with alterations in cell cycle distribution.
Conclusions:
- EGF and TGF-alpha are significant growth regulators for these specific human ovarian adenocarcinoma cell lines.
- The findings highlight the importance of EGF receptor signaling in ovarian cancer progression.