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Published on: December 19, 2019
Carcinogen 7,12-dimethylbenz[a]anthracene-induced mammary tumorigenesis is accelerated in Smad3 heterozygous mice
Zhengxue Liu1,2,3,4, Tanima Kundu-Roy1,2,3, Isao Matsuura1,2,3,5
1Center for Advanced Biotechnology and Medicine, Rutgers, The State University of New Jersey, Piscataway, NJ, USA.
Abstract:
Previous studies based on cell culture and xenograft animal models suggest that Smad3 has tumor suppressor function for breast cancer during early stages of tumorigenesis. In this report, we show that DMBA (7,12-dimethylbenz[a]anthracene), a chemical carcinogen, induces mammary tumor formation at a significantly higher frequency in the Smad3 heterozygous mice than in the Smad3 wild type mice. This is the first genetic evidence showing that Smad3 inhibits mammary tumor formation in a mouse model. Our findings support the notion that Smad3 has important tumor suppressor function for breast cancer.
Insights
Smad3 acts as a tumor suppressor in early breast cancer development. Genetic evidence from a mouse model shows Smad3 deficiency significantly increases mammary tumor formation, confirming its inhibitory role.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- Smad3's tumor suppressor role in breast cancer is suggested by cell culture and xenograft models.
- Early stages of tumorigenesis are when Smad3's function is thought to be critical.
Purpose of the Study:
- To provide genetic evidence for Smad3's role in mammary tumor formation using a mouse model.
- To investigate the impact of Smad3 deficiency on chemically induced breast cancer.
Main Methods:
- Utilizing Smad3 heterozygous and wild type mice.
- Inducing mammary tumors using the chemical carcinogen 7,12-dimethylbenz[a]anthracene (DMBA).
- Comparing tumor formation frequency between different mouse genotypes.
Main Results:
- Mammary tumor formation occurred at a significantly higher frequency in Smad3 heterozygous mice compared to wild type mice.
- DMBA administration led to increased tumor incidence in mice with reduced Smad3 levels.
Conclusions:
- This study provides the first genetic evidence that Smad3 inhibits mammary tumor formation in a mouse model.
- The findings reinforce the concept of Smad3 as a crucial tumor suppressor in breast cancer development.
