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[The relationship between stomach tumor development in mice and DMBA distribution]
Abstract:
The character of blastomogenic action of 7,12-dimethylbenz(a)anthracene on the stomach in its parenteral administration was studied on different lines of mice. Under the same conditions DMBA distribution was investigated in the proventriculus and gastric glandular tissues. In DMBA application on mice skin oin the dosage of 0.05 mg per animal in 0.1 ml of acetone proventricular tumors developed in 34% of mice of line CC57Br, in 10% of mice of line CC57W, and in 11% of mice of line C3HA, and in 19% of white nonpedigree mice. In intraperitoneal injection of DMBA in the dose of 0.5 mg per mouse in 0.2 ml of saline solution proventricular tumors appeared in 56% of CC57Br mice (in 9 of 16) and in one of five mice of CC57W line. Whereas, in application of DMBA onto mice skin in the dose of 0.5 mg per mouse in 0.1 ml of acetone the DMBA content in the proventriculus was 13 times higher than that in gastric glandular tissues.
Insights
7,12-dimethylbenz(a)anthracene (DMBA) causes proventricular tumors in mice, with higher incidence in CC57Br mice. DMBA distribution studies reveal higher concentrations in the proventriculus after topical skin application.
Area of Science:
- Oncology
- Toxicology
- Carcinogenesis
Background:
- 7,12-dimethylbenz(a)anthracene (DMBA) is a known carcinogen.
- The blastomogenic effects of DMBA on the stomach, specifically the proventriculus, require further investigation.
- Understanding DMBA distribution is crucial for assessing its carcinogenic potential.
Purpose of the Study:
- To investigate the blastomogenic action of DMBA on the mouse stomach.
- To compare the incidence of proventricular tumors across different mouse lines after DMBA administration.
- To determine the distribution of DMBA in gastric tissues following different administration routes.
Main Methods:
- Studied blastomogenic action of DMBA on different mouse lines (CC57Br, CC57W, C3HA, nonpedigree).
- Administered DMBA via topical skin application and intraperitoneal injection.
- Quantified DMBA distribution in proventricular and gastric glandular tissues.
Main Results:
- Topical DMBA application induced proventricular tumors in 34% of CC57Br mice, 10% of CC57W, 11% of C3HA, and 19% of nonpedigree mice.
- Intraperitoneal DMBA injection resulted in proventricular tumors in 56% of CC57Br mice and one CC57W mouse.
- Topical DMBA application led to a 13-fold higher DMBA concentration in the proventriculus compared to gastric glandular tissues.
Conclusions:
- DMBA exhibits blastomogenic activity on the mouse proventriculus.
- Mouse strain (e.g., CC57Br) influences susceptibility to DMBA-induced proventricular tumors.
- Topical application of DMBA results in preferential accumulation in the proventriculus, suggesting a potential mechanism for tumor induction.