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Quantitative assay for carcinogen altered differentiation in mouse epidermal cells.
M F Kulesz-Martin1, B Koehler, H Hennings
1Laboratory of Experimental Pathology, National Cancer Institute, Bethesda, MD 20205, USA.
Carcinogenesis
|January 1, 1980
Summary
Chemical carcinogens alter epidermal cell differentiation. This study developed a method to quantify these changes in vitro, identifying a potential early marker for preneoplastic cells. This research aids in understanding carcinogenesis.
Area of Science:
- Dermatology
- Cell Biology
- Carcinogenesis Research
Background:
- Epidermal cell proliferation and differentiation are tightly regulated by calcium ion concentration.
- Dysregulation of these processes is linked to epidermal carcinogenesis in vivo.
Purpose of the Study:
- To investigate if chemical carcinogens alter the phenotypic response of epidermal cells to calcium.
- To develop a quantitative in vitro assay for carcinogen-induced changes in epidermal cell differentiation.
Main Methods:
- Normal primary epidermal cells were cultured in low calcium medium and treated with chemical carcinogens.
- Cells were subsequently transferred to high calcium medium to induce differentiation.
- Surviving colonies were quantified to assess the effect of carcinogen treatment.
Main Results:
- Carcinogen treatment (7,12-dimethylbenz[a]anthracene or N-methyl-N'-nitro-N-nitrosoguanidine) resulted in a 4-10 fold increase in surviving epidermal colonies compared to controls.
- Colony formation was dose-dependent and increased with prolonged culture in low calcium.
- Cells from colonies exhibited epidermal morphology but lacked anchorage-independent growth or tumor-forming potential.
Conclusions:
- This in vitro model system provides a quantitative assay for detecting carcinogen-induced alterations in epidermal cell differentiation.
- The method may select for early properties of preneoplastic epidermal cells, aiding in carcinogenesis research.