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Effect of epidermal growth factor on rat pleural mesothelial cell growth
A Van der Meeren1, F Levy, A Renier
1INSERM U 139, CHU Henri Mondor, Créteil, France.
Abstract:
We recently reported that the growth of normal rat pleural mesothelial cells (RPMCs) is inhibited by conditioned media from either in vivo or in vitro transformed RPMCs. In this study we report that the growth of normal RPMCs is inhibited by epidermal growth factor (EGF). This was demonstrated by using three methods of investigation. Two types of studies were carried out with growing cells. First, cell counts indicated that the number of cells was reduced in EGF-treated cultures when compared with untreated cultures. Second, the percentage of S cells detected by flow cytometry following treatment with EGF was lower than without EGF. In other experiments, incorporation of tritiated thymidine in confluent cells was decreased by EGF treatment, either in the presence or absence of fetal calf serum; these effects were dose dependent and were observed from 2 ng/ml EGF. Lower EGF concentrations did not significantly modify thymidine incorporation when compared with untreated cells. Analysis of 125I EGF binding experiments by the Scatchard method indicated that RPMCs posses EGF receptors (about 10(5) per cell) with low ligand binding affinity (Kd = 1.7 +/- 0.4 nM). These results indicate that EGF might modulate the growth of RPMCs.
Insights
Epidermal growth factor (EGF) inhibits normal rat pleural mesothelial cell (RPMC) growth. Studies show reduced cell counts, lower S-phase cells via flow cytometry, and decreased thymidine incorporation with EGF treatment.
Area of Science:
- Cell Biology
- Molecular Biology
- Oncology
Background:
- Normal rat pleural mesothelial cells (RPMCs) growth is inhibited by conditioned media from transformed RPMCs.
- Epidermal growth factor (EGF) is a key regulator of cell growth and differentiation.
Purpose of the Study:
- To investigate the effect of EGF on the growth of normal RPMCs.
- To determine the mechanism by which EGF influences RPMC proliferation.
Main Methods:
- Cell counting to assess proliferation.
- Flow cytometry to analyze cell cycle distribution.
- Tritiated thymidine incorporation assays to measure DNA synthesis.
- 125I EGF binding studies with Scatchard analysis to quantify EGF receptors.
Main Results:
- EGF treatment significantly reduced the number of RPMCs in a dose-dependent manner.
- Flow cytometry revealed a lower percentage of S-phase cells in EGF-treated cultures.
- EGF decreased thymidine incorporation in confluent RPMCs, with effects observed from 2 ng/ml.
- RPMCs possess approximately 10^5 EGF receptors per cell with a Kd of 1.7 +/- 0.4 nM.
Conclusions:
- EGF inhibits the proliferation of normal rat pleural mesothelial cells.
- EGF exerts its inhibitory effect through interaction with specific EGF receptors on RPMCs.
- These findings suggest a potential role for EGF in modulating mesothelial cell growth.