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Polyamines regulate expression of the neoplastic phenotype in mouse skin
A Peralta Soler1, G Gilliard, L Megosh
1The Lankenau Medical Research Center, Wynnewood, Pennsylvania 19096, USA.
Cancer Research
|May 1, 1998
Summary
Elevated polyamine levels, especially putrescine, drive skin cancer development and maintenance in mice. Inhibiting ornithine decarboxylase with DFMO reversed tumor growth and regression.
Area of Science:
- Oncology
- Biochemistry
- Dermatology
Background:
- Elevated polyamine levels are common in neoplastic cells and tissues.
- Polyamines play a role in cell growth and proliferation.
Purpose of the Study:
- To investigate the role of polyamines, specifically putrescine, in the development and maintenance of skin neoplastic phenotype.
- To evaluate the efficacy of ornithine decarboxylase inhibition in a mouse model of skin carcinogenesis.
Main Methods:
- Utilized transgenic mice overexpressing ornithine decarboxylase in the skin.
- Administered alpha-difluoromethylornithine (DFMO), a specific inhibitor of ornithine decarboxylase.
- Assessed tumor development, regression, apoptosis, and cell proliferation rates.
Main Results:
- DFMO treatment reversibly blocked squamous papilloma formation after carcinogen exposure.
- DFMO treatment led to rapid, reversible regression of existing papillomas.
- Tumor cell proliferation decreased significantly with DFMO treatment, while apoptosis remained unaffected.
- Normal epidermal keratinocyte proliferation was not affected by DFMO.
Conclusions:
- Elevated polyamine levels, particularly putrescine, are essential for the development and maintenance of the neoplastic phenotype in skin.
- Inhibition of ornithine decarboxylase by DFMO represents a potential therapeutic strategy for skin neoplasms.