Pathological features of chronic liver injury induced by Helicobacter hepaticus in BALB/cCr mice / 中华临床感染病杂志

ABSTRACT

Objective To observe pathological features of liver injury induced by Helicobacter hepaticus ( H.hepaticus) and the difference between male and female BALB/cCr mice.Methods Fifty SPF-class BALB/cCr mice (25 males and 25 females) were administrated by gavage with 0.2 mL bacterial suspension (1 ×108 CUF/ml) of H.hepaticus standard strain ATCC 51450 for 3 times with 48 h intervals. The control group (25 males and 25 females) received same volume of phosphate buffered saline (PBS). Mice were sacrificed in batches ( n=5) after fasting for 12 h at month 1, 3, 6, 9 and 12.Enzyme linked immunosorbent assay ( ELISA) was used to determine the serum level of H.hepaticus IgG antibodies.Liver tissue samples were taken for histopathology examiantion, micro-aerobic bacteria isolation, culture and identification.t test was used to analyze the differences in serum levels of H.hepaticus IgG antibody and liver histopathologic scores between different time points and groups. Results The seroprevalance of H. hepaticus-IgG antibody in male BALB/cCr mice infected with H.hepaticus were all positive, peaked at 6 month, and then gradually declined.H.hepaticus-IgG antibody levels at 3, 6, 9 and 12 month were higher than that at 1 month (t=2.828, 4.300, 3.536 and 4.500, P0.05).Conclusion Compared with female mice, H.hepaticus colonization and histopathologic changes in liver are more significant in male BALB/cCr mice infected with H.hepaticus, and the histological scores are increased as infection time extended.