Related Experiment Video
Updated: Jul 15, 2026
The Dimethylnitrosamine Induced Liver Fibrosis Model in the Rat
Published on: June 17, 2016
Iron deposition and fat accumulation in dimethylnitrosamine-induced liver fibrosis in rat
Jin-Yang He1, Wen-Hua Ge, Yuan Chen
1Tropical Medicine Institute of Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong Province, China. sunny12345678_89@yahoo.com.cn
Aim:
To investigate if iron deposition and fat accumulation in the liver play a pathogenetic role in dimethylnitrosamine (DMN)-induced liver fibrosis in rat.
Methods:
Thirty rats were treated with DMN at does consecutive days of 10 microL/kg daily, i.p., for 3 consecutive day each week for 4 wk. Rats (n=30) were sacrificed on the first day (model group A) and 21(st) d (model group B) after cessation of DMN injection. The control group (n=10) received an equivalent amount of saline. Liver tissues were stained with hematoxylin and eosin (HE) and Masson and Prussian blue assay and observed under electron microscopy. Serum alanine aminotransferase (ALT) and liver tissue hydroxyproline (Hyp) content were tested.
Results:
The liver fibrosis did not automatically reverse, which was similar to previous reports, the perilobular deposition of iron accompanied with collagen showed marked characteristics at both the first and 21(st) d after cessation of DMN injection. However, fat accumulation in hepatocytes occurred only at the 21(st) d after cessation of DMN injection.
Conclusion:
Iron deposition and fat accumulation may play important roles in pathological changes in DMN-induced rat liver fibrosis. The detailed mechanisms of these characteristics need further research.
Insights
Dimethylnitrosamine (DMN)-induced liver fibrosis in rats shows persistent iron deposition and collagen, with fat accumulation appearing later. These findings suggest iron and fat play key roles in the progression of DMN-induced liver fibrosis.
Area of Science:
- Hepatology
- Toxicology
- Pathology
Background:
- Dimethylnitrosamine (DMN) is a potent hepatotoxin used to induce liver fibrosis in animal models.
- Understanding the pathogenetic mechanisms of DMN-induced liver fibrosis is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the roles of iron deposition and fat accumulation in the pathogenesis of DMN-induced liver fibrosis in rats.
- To determine the temporal relationship between iron deposition, fat accumulation, and liver fibrosis progression.
Main Methods:
- Rats were administered DMN for 4 weeks, with tissue analysis performed at different time points post-treatment.
- Histological examination included hematoxylin and eosin (HE), Masson, and Prussian blue staining.
- Biochemical markers such as serum alanine aminotransferase (ALT) and liver hydroxyproline (Hyp) were measured.
Main Results:
- Persistent liver fibrosis was observed, characterized by perilobular iron deposition and collagen accumulation.
- Fat accumulation in hepatocytes was evident at 21 days after DMN cessation, but not immediately after.
- Serum ALT and liver hydroxyproline levels indicated ongoing liver injury and fibrosis.
Conclusions:
- Iron deposition and subsequent fat accumulation are implicated in the pathological changes of DMN-induced rat liver fibrosis.
- These findings highlight potential therapeutic targets for managing liver fibrosis.
- Further research is needed to elucidate the detailed mechanisms underlying these observations.
Related Concept Videos
01:23Cirrhosis I: Introduction
01:24Cirrhosis II: Pathophysiology