Abstract
Immunohistochemical examinations of hepatic stellate cells (HSCs) were performed on six enlarged livers from broiler chickens with malformation of the extrahepatic biliary tract (group 1) and on eight broiler livers affected with naturally occurring cholangiohepatitis without biliary malformation (group 2). The livers from both groups were grossly enlarged, firm and tan-coloured, and histologically revealed severe diffuse fibrosis with proliferation of bile ductules. HSCs positive for muscle actin and desmin actively proliferated in the perisinusoidal space and around newly formed bile ductules. There was no difference in the immunohistochemical reactivities and location of HSCs between the two groups. The findings suggest that the diffuse hepatic fibrosis found in group 2 as well as group 1 results from reactive proliferation of HSCs.
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