The influence of dietary phosphorus and magnesium concentrations on the calcium content of heart and kidneys of DBA/2 and NMRI mice.
Dystrophic cardiac calcification (DCC) is often found in DBA/2 mice, reportedly in association with low plasma magnesium levels in this mouse strain. It was hypothesized that high-phosphorus diets and low-magnesium diets that are known to lower plasma magnesium concentrations would promote the development of DCC. DBA/2 mice were fed diets with either low-magnesium (0.02%, w/w) or high-phosphorus (0.8%) concentrations or a combination of the two variables. NMRI mice were given either a low- (0.2%) or high- (0.6%) phosphorus diet. Female, but not male, NMRI mice accumulated calcium in the heart when fed the high-phosphorus diet; neither gender developed kidney calcification. DBA/2 mice with either a low-magnesium or a high-phosphorus intake developed marked cardiac calcifications. The combination of low-magnesium and high-phosphorus intake caused severe calcification of the heart, kidney and tongue. Increasing the dietary magnesium content (0.08%) and reducing phosphorus (0.2%) did not fully prevent cardiac calcification, but reduced heart calcium concentrations in male DBA/2 mice. It is concluded that diets for DCC-susceptible mice should contain adequate amounts of magnesium and low, but sufficient amounts of phosphorus in order not to additionally stimulate cardiac calcification.
van den Broek
F A
FA
Small Animal Centre, Agricultural University Wageningen, The Netherlands.
Beynen
A C
AC
D000818:Animals; D001835:Body Weight; D002114:Calcinosis; D002118:Calcium / Q000032:analysis*; D004032:Diet; D005260:Female; D007668:Kidney / Q000737:chemistry*; D008274:Magnesium / Q000008:administration & dosage*; D008297:Male; D051379:Mice; D008811:Mice, Inbred DBA; D009206:Myocardium / Q000737:chemistry* / Q000473:pathology; D009929:Organ Size; D010758:Phosphorus / Q000008:administration & dosage*; D013045:Species Specificity
D010758:Phosphorus; D008274:Magnesium; D002118:Calcium