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Histopathological investigation of DMF-induced hepatotoxicity
H Itoh1, T Uchikoshi, K Oikawa
1First Department of Pathology St. Marianna University School of Medicine, Kawasaki, Japan.
Abstract:
N,N-Dimethylformamide (DMF) has been implicated in the production of hepatotoxicity in male and female F344 rats. Repeated administration of dosages of 0.75 and 1.0 ml/kg DMF for up to 12 weeks produced massive liver necrosis associated with decreased body weight gain. Macroscopically, areas of necrotic change were well pronounced in every hepatic lobe, being yellowish-red in coloration, irregular in shape, and varying in size, but were most striking immediately adjacent to the porta hepatis. Among the lobes, those which were relatively small were most markedly affected, and occasionally an entire lobe was involved. Light and electron microscopic studies revealed the hepatic architecture to be occupied by massive fibrosis. There were, however, sharp lines of demarcation between surviving normal and necrotic areas. Hemosiderosis involving macrophages was accompanied by proliferative bile ductules and a number of multinucleated giant cells. The distribution and quality of the hepatic lesions produced by DMF were discussed.
Insights
N,N-Dimethylformamide (DMF) causes significant liver damage (hepatotoxicity) in rats, leading to necrosis and fibrosis. This study details the macroscopic and microscopic changes observed following repeated DMF administration.
Area of Science:
- Toxicology
- Hepatology
- Animal Studies
Background:
- N,N-Dimethylformamide (DMF) is a common industrial solvent.
- Previous studies suggest a potential link between DMF exposure and liver damage.
Purpose of the Study:
- To investigate the hepatotoxic effects of N,N-Dimethylformamide (DMF) in male and female F344 rats.
- To characterize the pathological changes in the liver following repeated DMF administration.
Main Methods:
- Repeated administration of N,N-Dimethylformamide (DMF) at dosages of 0.75 and 1.0 ml/kg for up to 12 weeks.
- Macroscopic, light microscopic, and electron microscopic examination of rat livers.
- Assessment of body weight changes.
Main Results:
- Massive liver necrosis and decreased body weight gain were observed in DMF-treated rats.
- Histopathological findings included massive fibrosis, proliferative bile ductules, and multinucleated giant cells.
- Necrotic changes were most pronounced near the porta hepatis, affecting smaller lobes significantly.
Conclusions:
- Repeated N,N-Dimethylformamide (DMF) administration induces severe hepatotoxicity in F344 rats.
- The observed liver lesions are characterized by necrosis, fibrosis, and inflammation.
- DMF-induced hepatotoxicity warrants further investigation for potential human health risks.