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Phophate-induced renal calcification in the rat
Canadian Journal of Physiology and Pharmacology
|January 1, 1979
Summary
Semisynthetic diets with inorganic phosphate can cause nephrocalcinosis in rats. Dietary calcium, protein, and phosphate source influence the severity of this kidney condition.
Area of Science:
- Nephrology
- Nutritional Science
- Toxicology
Background:
- Nephrocalcinosis is a condition characterized by calcium deposits in the kidney.
- Understanding the dietary factors contributing to nephrocalcinosis is crucial for preventing kidney damage.
Purpose of the Study:
- To investigate the induction of nephrocalcinosis in Wistar rats using semisynthetic diets.
- To determine the effects of varying calcium (Ca) and phosphorus (P) concentrations on renal calcification.
Main Methods:
- Weanling female Wistar rats were fed semisynthetic diets with controlled Ca and P levels for 4-6 weeks.
- Renal Ca and P concentrations were measured and compared to control rats fed standard rodent chow.
Main Results:
- Nephrocalcinosis was induced by semisynthetic diets with inorganic phosphate as low as 0.5% (w/w).
- Lesion severity correlated with dietary phosphate (0.5-1.0%), but was modified by Ca and protein levels.
- Higher dietary Ca (0.5-1.0%) decreased severity at 0.5% phosphate; lower protein (15% casein) increased severity.
Conclusions:
- Semisynthetic diets, particularly those high in inorganic phosphate, can induce nephrocalcinosis in rats.
- Dietary factors like calcium, protein, and the source of phosphate (inorganic vs. organic) significantly modify the development and severity of renal calcification.