Toxicol Res.  2013 Sep;29(3):187-193.

Hepatotoxicity in Rats Treated with Dimethylformamide or Toluene or Both

• Kim KW
• Chung YH

Abstract

The effects of toluene in dimethylformamide (DMF)-induced hepatotoxicity were investigated with respect to the induction of cytochrome P-450 (CYP) and the activities of related enzymes. The rats were treated intraperitoneally with the organic solvents in olive oil (Single treatment groups: 450 [D1], 900 [D2], 1,800 [D3] mg DMF, and 346 mg toluene [T] per kg of body weight; Combined treatment groups: D1+T, D2+T, and D3+T) once a day for three days, while the control group received just the olive oil. Each group consisted of 4 rats. The activities of the xenobiotic metabolic enzymes and the hepatic morphology were assessed. The immunoblots indicated that the expression of CYP2E1 was considerably enhanced depending on the dosage of DMF and the CYP2E1 blot densities were significantly increased after treatment with both DMF and toluene, compared to treatment with DMF alone. The activities of glutathione-S-transferase and glutathione peroxidase were either decreased or remained unaltered after treatment with DMF and toluene, whereas the lipid peroxide levels were increased with increasing dosage of DMF and toluene. The liver tissue in the D3 group (1,800 mg/kg of DMF) showed signs of microvacuolation in the central vein region and a large necrotic zone around the central vein, in rats treated with both DMF (1,800 mg/kg) and toluene (D3T). These results suggest that the expression of CYP2E1 is induced by DMF and enhanced by toluene. These changes may have facilitated the accelerated formation of N-methylformamide (NMF) from toluene, and the generated NMF may directly induce liver damage.

Keyword

Dimethylformamide; Toluene; Cytochrome P-4502E1; Enzyme; Lipid peroxides

MeSH Terms

Animals
Body Weight
Cytochrome P-450 CYP2E1
Cytochrome P-450 Enzyme System
Dimethylformamide*
Formamides
Glutathione Peroxidase
Lipid Peroxides
Liver
Olea
Plant Oils
Rats*
Solvents
Toluene*
Veins
Olive Oil
Cytochrome P-450 CYP2E1
Cytochrome P-450 Enzyme System
Dimethylformamide
Formamides
Glutathione Peroxidase
Lipid Peroxides
Plant Oils
Solvents
Toluene