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Fetuin-A (AHSG) prevents extraosseous calcification induced by uraemia and phosphate challenge in mice
Ralf Westenfeld1, Cora Schäfer, Ralf Smeets
1Department of Nephrology and Clinical Immunology, University Hospital Aachen, Pauwelsstrasse 30, D-52057 Aachen, Germany. ralf.westenfeld@rwth-aachen.de
Insights
Fetuin-A deficiency exacerbates calcification in chronic kidney disease (CKD) and high phosphate diets, leading to severe vascular and tissue calcification. This highlights fetuin-A
Area of Science:
- Nephrology
- Vascular Biology
- Biochemistry
Background:
- Chronic kidney disease (CKD) is linked to vascular and tissue calcification.
- Vascular calcification is an independent predictor of cardiovascular mortality in hemodialysis patients.
Purpose of the Study:
- To investigate the role of fetuin-A in CKD-associated calcification.
- To determine the influence of CKD, dietary phosphate, and fetuin deficiency on calcification.
Main Methods:
- Utilized a mouse model with graded renal insufficiency induced by nephrectomy and high phosphate diet.
- Compared wild-type and fetuin-A-deficient mice on a calcification-resistant genetic background (C57BL/6).
- Assessed hyperphosphataemia, BUN, hyperparathyroidism, and von Kossa staining for calcification; analyzed osteopontin expression.
Main Results:
- Fetuin-A deficient mice with CKD and high phosphate diet exhibited severe calcification in kidneys, heart, and lungs, despite a moderate calcium-phosphate product.
- Wild-type mice under identical conditions showed only renal calcification, despite a higher calcium-phosphate product.
- Osteopontin induction preceded calcification, indicating differentiation into osteoblast-like cells.
Conclusions:
- Fetuin-A deficiency, CKD, and high phosphate diet synergistically contribute to extraosseous calcification.
- Fetuin-A plays a critical protective role against widespread calcification in CKD.
Background:
Chronic kidney disease (CKD) is associated with vascular and tissue calcification. The extent of vascular calcification has been identified as an independent risk factor of cardiovascular death in patients on haemodialysis.
Methods:
We studied the role of fetuin-A in CKD-associated calcification using a mouse model of graded renal insufficiency generated by nephrectomy and high phosphate diet. We used wild-type and fetuin-A-deficient mice on the calcification resistant genetic background C57BL/6 to study the influence on calcification of CKD, dietary phosphate and fetuin deficiency. Hyperphosphataemia, elevated BUN, hyperparathyroidism and von Kossa histochemistry served as indicators of calcification disease. The expression of osteopontin, a marker of osteoblast-like cell differentiation was analyzed by realtime PCR and immunohistochemistry.
Results:
We detected tissue and genotype-specific susceptibility for calcification. Fetuin-A-deficient mice with CKD and high phosphate diet had only a moderately elevated serum calcium phosphate product (6.9 +/- 1.4 mmol(2)/l(2)), but suffered severe calcification of kidney, heart and lung. In contrast, wild-type mice under the same conditions developed renal calcinosis only despite an elevated serum calcium phosphate product (9.6 +/- 0.9 mmol(2)/l(2)). Calcification was preceded by the local induction of osteopontin, a marker for osteoblast-like cell differentiation.
Conclusion:
Fetuin-A deficiency, CKD and high phosphate diet act synergistically in the pathogenesis of extraosseous calcification.
