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Published on: July 19, 2018
Expression and function of matrix Gla protein in human peritoneal mesothelial cells
Yihui Zhai1, Ling Chen, Meike Hömme
11Division of Pediatric Nephrology, Center for Children and Adolescent Medicine, University Hospital for Pediatric and Adolescent Medicine, Heidelberg, Germany.
Matrix Gla protein (MGP) is expressed by peritoneal mesothelial cells and regulates peritoneal calcification. Suppressing MGP significantly increases calcium and phosphorus deposition, highlighting its role in peritoneal calcium homeostasis.
Area of Science:
- Nephrology
- Cell Biology
- Biochemistry
Background:
- Chronic peritoneal dialysis (PD) is linked to peritoneal calcification, a process potentially regulated like bone mineralization.
- Ectopic calcification in vascular tissue is an active, regulated process, suggesting similar mechanisms may occur in the peritoneum.
Purpose of the Study:
- To investigate the role of matrix Gla protein (MGP), secreted by peritoneal mesothelial cells, in regulating peritoneal calcification.
- To determine if MGP expression and function are influenced by factors present in peritoneal dialysis fluids and cytokines.
Main Methods:
- Quantified MGP mRNA and protein in human primary mesothelial cells (HPMC) exposed to PD fluid components and cytokines using RT-PCR and Western blot.
- Investigated in vivo MGP expression via immunohistochemistry.
- Assessed the functional impact of MGP by silencing it with siRNA and measuring calcium phosphate deposition.
Main Results:
- MGP was detected in mesothelial cells and culture medium, with its expression modulated by glucose, IGF1, and TGFß1.
- Silencing MGP in HPMC led to a significant increase (90-100%) in calcium and phosphorus deposition.
- MGP's inhibitory effect on calcification was observed at physiological calcium and phosphorus concentrations.
Conclusions:
- Matrix Gla protein (MGP) is expressed by human peritoneal mesothelial cells and its expression is regulated by key factors in the peritoneal environment.
- MGP acts as a potent inhibitor of calcification in vitro, suggesting a crucial role in maintaining peritoneal calcium homeostasis.
- These findings identify MGP as a potential therapeutic target for preventing or treating peritoneal calcification in patients undergoing PD.
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