Histopathological staining illustrated the effects of two dietary
oils on CCl4 induced liver injury. The livers from normal groups fed
with either corn oil or olive oil showed a normal architecture with
little fibrous portal expansion, indicates the 20% high fat intake have
little effect on the liver (Fig. 1). In CCl4-induced liver fibrosis, large fibrous septa formation and remarkable collagen accumulation
around the portalwere observed; several portal–portal linkage bridging
fibrosis were also found under the light microscope (Fig. 1).
Comparing the photomicrograph from CCl4 treated animals fed with
corn oil or EVOO, the results showed that the CCl4 induced tissue
architecture alteration was much weaker in the olive oil CCl4+ group,
and the fibre formation was lower than corn oil CCl4+ group. Histological
activity index analysis confirmed the difference; the scores
of the corn oil CCl4+ group are significantly higher than the olive
oil CCl4+ group (p < 0.05).