Related Experiment Video
Updated: Jun 27, 2026
A Mouse Model of Chronic Liver Fibrosis for the Study of Biliary Atresia
Published on: February 3, 2023
Immunological investigation of the hepatic tissue from infants with biliary atresia
Haruna Baba1, Yoshikazu Ohtsuka, Tohru Fujii
1Department of Pediatrics and Adolescence Medicine, Juntendo University School of Medicine, 2-1-1, Hongo, Bunkyo-ku, Tokyo, 113-8421, Japan.
Purpose:
Matrix metalloproteinases (MMPs) and their endogenous tissue inhibitors [tissue inhibitors of metalloproteinases (TIMPs)] have been implicated in tissue injury and remodeling in many organs. The objective of this study was to evaluate the expression of MMP-3 and -9, and TIMP-1, -2, and -3 and their relationship to liver fibrosis in infants with biliary atresia.
Methods:
The expression of MMP-3 and-9 and TIMP-1, -2 and -3 was investigated in liver tissue samples of nine patients with biliary atresia. In addition, the expression of CCR-4 and CCR-5 was analyzed to investigate the activation of Th1 and Th2 cells. The mRNA levels were measured by semiquantitative reverse transcriptase polymerase chain reaction.
Results:
The expression of MMP-3 was higher than that of MMP-9 in all samples (P < 0.01). The expression of TIMP-1 was higher than that of TIMP-2 and -3 in all samples (P < 0.01). The expression of CCR-5 was higher than that of CCR-4 (P < 0.05), which implied higher activation of Th1 cells relative to Th2 cells.
Conclusion:
Our findings suggest that MMP-3, possibly induced by Th1 cytokines, and its balance with TIMP-1, may be one of the factors involved in the pathogenesis of biliary atresia.
Insights
Matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMPs) are key in biliary atresia. MMP-3 and TIMP-1 levels suggest their role in infant liver disease pathogenesis.
Area of Science:
- Biochemistry
- Immunology
- Pediatric Hepatology
Background:
- Matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMPs) are crucial in tissue remodeling and injury.
- Their role in pediatric liver diseases like biliary atresia is not fully understood.
Purpose of the Study:
- To investigate the expression of MMP-3, MMP-9, TIMP-1, TIMP-2, and TIMP-3 in infants with biliary atresia.
- To explore the relationship between these factors and liver fibrosis.
- To analyze the activation of Th1 and Th2 cells via CCR-4 and CCR-5 expression.
Main Methods:
- Analysis of liver tissue samples from nine infants with biliary atresia.
- Measurement of mRNA levels for MMPs and TIMPs using semiquantitative reverse transcriptase polymerase chain reaction.
- Assessment of CCR-4 and CCR-5 expression to evaluate T-helper cell activation.
Main Results:
- MMP-3 expression was significantly higher than MMP-9.
- TIMP-1 expression was significantly higher than TIMP-2 and TIMP-3.
- CCR-5 expression was higher than CCR-4, indicating greater Th1 cell activation.
Conclusions:
- Elevated MMP-3, potentially induced by Th1 cytokines, and its balance with TIMP-1 may contribute to biliary atresia pathogenesis.
- These findings highlight the potential involvement of MMPs and TIMPs in the development of this infant liver condition.
