RESUMEN
Objective To observe the effect of transforming growth factor-β1 (TGF-β1) vaccine on the degree of hepatic fibrosis in rats ,and to explore the effect of TGF-β1 vaccine on the insulin-like growth factor binding protein (IGFBP)3 and IGFBP7 .Methods The hepatic fibrosis rat model was set up by injecting N-nitrosodimethylamine . Among them , 10 rats were injected with TGF-β1 vaccine , and additional 10 rats were set up as healthy control group .Changes in hepatic pathology were observe and the expressions of IGFBP3 and IGFBP7 were detected by the methods of immunohistochemistry , reverse transcription polymerase chain reaction (RT-PCR) and Western blot in rat fibrosis tissues after 6 weeks . Normality test and analysis of variance were conducted .LSD test was conducted if variances were tested homogeneity .Categorical data were analyzed using Fisher exact test . Results Changes in hepatic histology and serum levels of hyaluronic acid and laminin suggested that TGF-β1 vaccine interventions could reduce the extent of hepatic fibrosis in rats .The expressions of IGFBP3 mRNA in control group ,hepatic fibrosis model group and vaccine intervention group were 1 .735 ± 0 .097 ,1 .165 ± 0 .096 and 1 .491 ± 0 .046 ,respectively (t= 4 .575 ,6 .285 and 8 .489 ,respectively ,all P< 0 .05) .The expressions of IGFBP7 in the above three groups were 0 .497 ± 0 .021 ,1 .250 ± 0 .064 and 0 .885 ± 0 .149 ,respectively (t= 5 .161 ,30 .101 and 7 .250 , respectively ,all P < 0 .05 ) . Immunohistochemistry proved that the expressions of IGFBP7 in fibrosis model group and TGF-β1 vaccine group were all significantly higher than control group ;and the expressions of IGFBP3 in fibrosis model group and TGF-β1 vaccine group were all significantly lower than control group .The expressions of IGFBP3 protein in control group , hepatic fibrosis model group and vaccine intervention group were 7 .508 ± 0 .357 ,5 .200 ± 0 .210 and 5 .751 ± 0 .178 ,respectively (t = 7 .622 ,6 .180 and 29 .156 , respectively ,all P < 0 .05) . The expressions of IGFBP7 were 1 .176 ± 0 .051 ,1 .735 ± 0 .115 and 1 .428 ± 0 .056 ,respectively (t = 7 .188 ,4 .827 and 8 .649 ,respectively ,all P< 0 .05) .Conclusion TGF-β1 vaccine can affect the expressions of IGFBP3 and IGFBP7 ,which plays an important role in the formation and development of hepatic fibrosis .