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[Regulation of EGF receptor by tumor promoters]
Abstract:
Regulation of the EGF receptor system by tumor promoters Nobuyoshi Shimizu (Dept. of Mol. Biol., Keio Univ. Sch. Med.) EGF inhibits the growth of several tumor cell lines that possess extremely high numbers of EGF receptors. The growth of some of these cell lines is also inhibited by the tumor promoter 12-O-tetradecanoyl phorbol 13-acetate (TPA) while others are insensitive to TPA. We have isolated variants from these cells that are no longer affected by EGF and/or TPA. Initial characterization of these cell variants is presented with regard to the TPA-directed regulation of the EGF receptor system.
Insights
Tumor cell growth is regulated by epidermal growth factor (EGF) and tumor promoter 12-O-tetradecanoyl phorbol 13-acetate (TPA). Researchers isolated cell variants resistant to EGF and/or TPA to study this regulation.
Area of Science:
- Molecular Biology
- Cell Biology
- Cancer Research
Background:
- Epidermal Growth Factor (EGF) inhibits the growth of specific tumor cell lines with high EGF receptor numbers.
- The tumor promoter 12-O-tetradecanoyl phorbol 13-acetate (TPA) also inhibits growth in some of these cell lines, but not all.
Purpose of the Study:
- To investigate the regulation of the EGF receptor system by tumor promoters.
- To characterize cell variants exhibiting altered sensitivity to EGF and TPA.
Main Methods:
- Isolation of tumor cell variants resistant to EGF and/or TPA.
- Initial characterization of these variants focusing on TPA-directed regulation of the EGF receptor system.
Main Results:
- Successfully isolated cell variants with differential resistance to EGF and TPA.
- These variants provide a model system to dissect the mechanisms of TPA-mediated regulation of EGF receptors.
Conclusions:
- Cell variants offer a valuable tool for understanding the complex interplay between EGF receptor signaling and tumor promoter activity.
- Further characterization of these variants will elucidate specific pathways involved in TPA's regulation of the EGF receptor system.