The comparison of the collagen fiber contents and hepatic stellate cell distribution in male and female chicken livers

The difference in collagen fiber content, morphological properties and hepatic stellate cell (HSC) distribution was investigated in the liver of both sexes in chicken. Collagen fiber specimens were obtained by maceration treatment with NaOH solution. HSCs were detected using desmin-specific immunohistochemistry. The ratio of liver weight to body weight was larger in the female than the male chickens. Collagen fiber content, the numerical density of HSCs and the percentage area displaying desmin immunopositivity were not different between the right and left lobes of the liver, in both male and female chickens. However, all of these parameters were larger in the males than the females. In the light microscopic observation, many HSCs in the male had large and elongated cytoplasmic processes. Conversely, HSCs with poorly developed cytoplasmic processes were frequently observed in females. Liver tissue is structurally stronger in male chickens than females and the activity and density of HSCs may be related to the collagen fiber content in chicken liver.