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Ligand activation of overexpressed epidermal growth factor receptors transforms NIH 3T3 mouse fibroblasts
H Riedel1, S Massoglia, J Schlessinger
1Department of Developmental Biology, Genentech, South San Francisco, CA 94080.
Abstract:
The cell surface receptor for the mitogenic peptide epidermal growth factor (EGF) is involved in control of normal cell growth and may play a role in the genesis of human neoplasia such as squamous carcinoma and glioblastoma. Soft-agar growth and focus-formation experiments with NIH 3T3 mouse fibroblasts transfected with an expression plasmid demonstrated the ligand-dependent transforming potential of the human EGF receptor without structural alterations. Activation of overexpressed normal receptor alone appears to be sufficient for transformation of NIH 3T3 cells in vitro.
Insights
The epidermal growth factor (EGF) receptor drives cell growth and cancer. Overexpressing this receptor in mouse cells caused them to transform, indicating its oncogenic potential.
Area of Science:
- Molecular Biology
- Cell Biology
- Cancer Research
Background:
- The epidermal growth factor (EGF) receptor is a cell surface receptor crucial for regulating normal cell growth.
- Dysregulation of the EGF receptor is implicated in human cancers like squamous carcinoma and glioblastoma.
- The precise mechanisms by which the EGF receptor contributes to neoplasia require further elucidation.
Purpose of the Study:
- To investigate the transforming potential of the human epidermal growth factor (EGF) receptor.
- To determine if overexpression and activation of the normal EGF receptor are sufficient for cellular transformation.
- To explore the role of the EGF receptor in the context of cancer genesis.
Main Methods:
- NIH 3T3 mouse fibroblasts were transfected with an expression plasmid encoding the human EGF receptor.
- Soft-agar growth assays were performed to assess anchorage-independent growth.
- Focus-formation experiments were utilized to evaluate transformation phenotypes.
Main Results:
- Transfected NIH 3T3 cells exhibited ligand-dependent transformation.
- Overexpression of the normal human EGF receptor alone was sufficient to induce transformation in vitro.
- The transforming potential was observed without any structural alterations to the receptor.
Conclusions:
- The epidermal growth factor (EGF) receptor possesses inherent transforming capabilities.
- Activation of an overexpressed, normal EGF receptor can drive cellular transformation.
- These findings highlight the EGF receptor's significant role in the development of certain human cancers.