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Altered extracellular matrix component gene expression in murine polycystic kidney
I Ebihara1, T Nakamura, T Takahashi
1Department of Medicine, Juntendo University School of Medicine, Tokyo, Japan.
Abstract:
The DBA/2FG-pcy mouse has a form of slowly progressive kidney disease that appears similar in many respects to that seen in the autosomal dominant form of human polycystic kidney disease. This study was designed to assess how the expression of extracellular matrix component genes is regulated in a model of murine polycystic kidney disease and control DBA/2 mice at 8, 16, and 30 weeks of age. The mRNA levels encoding for collagen IV, the B1 and B2 chains of laminin, heparan sulfate proteoglycan, fibronectin, and collagens I and III increased with the progression of cystic lesions in the kidney of DBA/2FG-pcy mice. At 30 weeks of age, mRNA levels for collagen IV, laminin B1 and B2, heparan sulfate proteoglycan, fibronectin, and collagens I and III were increased 8.1-fold, 7.0-fold, 7.0-fold, 9.8-fold, 7.0-fold, 5.5-fold, and 5.4-fold, respectively, compared to those of control DBA/2 mice. An immunofluorescence study revealed the irregular staining for collagen IV, laminin, heparan sulfate proteoglycan, and collagens I and III around the cysts. These data suggest that changes in the expression of basement membrane components and interstitial collagens are associated with the development of polycystic kidney disease.
Insights
This study reveals that extracellular matrix gene expression increases with kidney cyst development in a mouse model of polycystic kidney disease (PKD). These findings highlight the role of matrix components in PKD progression.
Area of Science:
- Nephrology
- Molecular Biology
- Genetics
Background:
- Polycystic kidney disease (PKD) is a genetic disorder characterized by kidney cyst formation.
- The DBA/2FG-pcy mouse model exhibits a slowly progressive kidney disease resembling human autosomal dominant PKD.
- Understanding the molecular mechanisms underlying PKD progression is crucial for developing therapeutic strategies.
Purpose of the Study:
- To investigate the regulation of extracellular matrix (ECM) component gene expression in a murine model of PKD.
- To compare ECM gene expression in DBA/2FG-pcy mice with control DBA/2 mice at different ages (8, 16, and 30 weeks).
Main Methods:
- Quantitative analysis of mRNA levels for key ECM components including collagen IV, laminin (B1 and B2 chains), heparan sulfate proteoglycan, fibronectin, and collagens I and III.
- Immunofluorescence staining to visualize the distribution of ECM proteins around kidney cysts.
Main Results:
- Significant upregulation of mRNA for collagen IV, laminin, heparan sulfate proteoglycan, fibronectin, and collagens I and III was observed with increasing cyst progression in DBA/2FG-pcy mice.
- At 30 weeks, mRNA levels for these ECM components were markedly elevated compared to controls (e.g., collagen IV increased 8.1-fold).
- Immunofluorescence revealed irregular deposition of these ECM proteins surrounding the developing cysts.
Conclusions:
- Altered expression of basement membrane components and interstitial collagens is associated with the pathogenesis of polycystic kidney disease in this mouse model.
- These ECM changes may play a significant role in the development and progression of kidney cysts in PKD.