Experimental esophageal carcinogenesis: technical standardization and results

Area of Science:

• Toxicology
• Carcinogenesis
• Gastroenterology

Background:

• Esophageal cancer remains a significant global health concern.
• Understanding chemical carcinogens is crucial for prevention and treatment strategies.
• Diethylnitrosamine (DEN) is a known potent carcinogen.

Purpose of the Study:

• To investigate the efficacy of diethylnitrosamine (DEN) in inducing epidermoid carcinoma of the esophagus.
• To evaluate the dose-dependent relationship between DEN exposure and tumor development in Wistar rats.
• To characterize the pathological features of DEN-induced esophageal lesions.

Main Methods:

• Wistar rats were administered DEN in drinking water at a dose of 10 mg/kg body weight.
• Four experimental groups were exposed for 90, 120, 150, or 200 days.
• A control group received untreated drinking water.
• Esophaguses were examined macroscopically and microscopically.

Main Results:

• No preneoplastic lesions or carcinomas were observed in the control group.
• DEN administration led to a significant increase in in situ, submucosal, microinvasive, and advanced esophageal carcinomas in exposed groups (P < 0.05).
• Tumor incidence and severity were dose-dependent on DEN exposure duration, with the T200 group showing the highest tumor burden.
• Pulmonary and liver carcinomas were also noted in the T200 group.

Conclusions:

• Diethylnitrosamine (DEN) is a reliable agent for inducing experimental esophageal epidermoid carcinoma in Wistar rats.
• The development and progression of esophageal lesions are directly related to the duration of DEN exposure.
• This model provides valuable insights into esophageal carcinogenesis and potential therapeutic targets.