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Selection of transformed cells in serum-free media
Abstract:
NIH3T3 cells grow in a serum-free basal nutrient medium supplemented with fibronectin, transferrin, insulin, epidermal growth factor (EGF) and high density lipoprotein (HDL). The individual omission from the serum-free medium of insulin, EGF, or HDL results in greatly reduced cell growth. These growth-restrictive conditions can be used to select for cells transformed with SV40, the polyomavirus middle T antigen gene, the activated human ras gene, and the mouse c-myc gene.
Insights
NIH3T3 cells require specific growth factors like insulin, epidermal growth factor (EGF), and high-density lipoprotein (HDL) for optimal proliferation in serum-free media. Omitting these factors creates selective conditions for identifying cells transformed by oncogenes or viral genes.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- NIH3T3 cells are a common model for studying cell growth and transformation.
- Serum-free media are essential for defined cell culture conditions.
- Specific growth factors play critical roles in mammalian cell proliferation.
Purpose of the Study:
- To define the essential growth factors for NIH3T3 cells in a serum-free medium.
- To investigate the impact of omitting individual growth factors on cell proliferation.
- To establish selective conditions for identifying transformed cells.
Main Methods:
- Culturing NIH3T3 cells in a serum-free basal nutrient medium.
- Supplementing the medium with fibronectin, transferrin, insulin, epidermal growth factor (EGF), and high-density lipoprotein (HDL).
- Assessing cell growth under conditions where insulin, EGF, or HDL were individually omitted.
Main Results:
- NIH3T3 cells demonstrated significantly reduced growth when insulin, EGF, or HDL were individually removed from the serum-free medium.
- These specific nutrient-deprived conditions served as a selective pressure for cell growth.
- Transformed cells, including those with SV40, polyomavirus middle T antigen, activated human ras, or mouse c-myc genes, could be selected under these restrictive conditions.
Conclusions:
- Insulin, EGF, and HDL are crucial for the growth of NIH3T3 cells in serum-free conditions.
- The selective growth restriction induced by omitting these factors provides a method for identifying cells transformed by specific oncogenes and viral genes.
- This approach offers a valuable tool for studying cell transformation and oncogenesis.