Related Experiment Video
Updated: Aug 12, 2026
Induction of Invasive Transitional Cell Bladder Carcinoma in Immune Intact Human MUC1 Transgenic Mice: A Model for Immunotherapy Development
Published on: October 31, 2013
[Development of renal tumors in rats on intermittently injected methylcholanthrene and nitrosodimethylamine]
Abstract:
Experiments on 892 non-inbred male rats studied the development of renal tumors in the animals intermittently administered two substances different in the mechanism of carcinogenic action. Renal pre-injection of methylcholantherene (MC) in a small dose insufficient to induce renal tumors in the study period, followed by dermal applications of this agent was shown to enhance a blastomogenic effect, as manifested by both early occurrence of precarcinogenic changes and early development of renal tumors at the site of primary injection of MC into the kidney. The effect of nitrosodimethylamine (NDMA) intermittently injected in a nephrotropic dose was studied in the second series of the experiments. The intermittent injection of NDMA in courses during 8 weeks gave rise to renal tumors in the early period, caused increases in the number of tumors and in the area of renal tumor proliferates. The mechanism of enhanced renal blastomogenesis is discussed in terms of the mechanisms responsible for initiation and progression.
Insights
This study shows that pre-injecting methylcholanthrene (MC) and intermittent nitrosodimethylamine (NDMA) injections enhance renal tumor development in rats. These findings offer insights into carcinogen mechanisms and tumor progression.
Area of Science:
- Oncology
- Toxicology
- Experimental Pathology
Context:
- Investigates the development of renal tumors in male rats.
- Utilizes two distinct carcinogenic agents with different mechanisms of action.
- Examines the effects of intermittent administration of carcinogens.
Purpose:
- To evaluate the blastomogenic effect of methylcholanthrene (MC) with pre-injection and dermal application.
- To determine the impact of intermittent nitrosodimethylamine (NDMA) injections on renal tumor formation.
- To elucidate the mechanisms underlying enhanced renal blastomogenesis.
Summary:
- Renal pre-injection of a low dose of MC followed by dermal application accelerated precarcinogenic changes and tumor development.
- Intermittent NDMA injections over 8 weeks led to early renal tumors, increased tumor number, and larger tumor areas.
- The study discusses initiation and progression mechanisms contributing to enhanced renal blastomogenesis.
Impact:
- Provides a model for studying renal tumor development and carcinogen interactions.
- Contributes to understanding the stages of tumor initiation and progression.
- Informs strategies for carcinogen risk assessment and prevention.
