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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Induction of gamma-glutamyltransferase-positive and nonspecific esterase-positive foci in rat liver by partial hepatectomy following single injection of N-nitrosodiethylamine.

The effect of partial hepatectomy (PH) on alteration of liver foci induced by N-nitrosodiethylamine (DENA) was studied in inbred F344 male rats. As early as 2 weeks after PH was performed 6 hours after an injection of 100 mg DENA/kg, gamma-glutamyltransferase-positive hepatocellular foci were induced, whereas DENA alone induced no foci until 12 weeks after PH. The focus counts of the group with PH performed 6 hours after an injection of 100 mg DENA/kg were consistently greater than those of a group with PH performed at 24 hours following DENA injection. At 3 and 6 weeks after PH was done at 12 weeks following treatment with 100 or 200 mg DENA/kg, the focus count was significantly increased compared with that in nonhepatectomized groups. The results indicate that increased liver cell proliferation resulting from PH enhances the conversion of persisting DNA damage to a permanent alteration in DNA. The effect at 12 weeks after exposure supports the concept that DNA damage in hepatocytes is highly persistent.[1]


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