Inductions of Ornithine Decarboxylase and DNA Synthesis in Rat Stomach Mucosa by Formaldehyde

Abstract
Administration of formaldehyde at doses of 11 to 110 mg/kg body weight by gastric intubation to male F344 rats induced up to 100-fold increase in ornithine decarboxylase activity with a maximum after 16 hr and up to 49-fold increase in DNA synthesis with a maximum after 16 hr in the pyloric mucosa of the stomach. These results suggest that formaldehyde has tumor-promoting activity in carcinogenesis in the glandular stomach.