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Inhibitory effect of high protein intake on nephrocalcinogenesis in female rats

Published online by Cambridge University Press:  09 March 2007

J. G. H. Sterck ,
J. Ritskes-Hoitinga  and
A. C. Beynen
J. G. H. Sterck
Affiliation:
Department of Human Nutrition, Agricultural University, PO Box 8129, 6700 EV Wageningen Department of Laboratory Animal Science, State University, PO Box 80.166, 3508 TD Utrecht, The Netherlands
J. Ritskes-Hoitinga
Affiliation:
Department of Laboratory Animal Science, State University, PO Box 80.166, 3508 TD Utrecht, The Netherlands
A. C. Beynen
Affiliation:
Department of Human Nutrition, Agricultural University, PO Box 8129, 6700 EV Wageningen Department of Laboratory Animal Science, State University, PO Box 80.166, 3508 TD Utrecht, The Netherlands
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Abstract

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Increased intakes of protein have been shown to reduce kidney calcification (nephrocalcinosis) in female rats. Two questions were addressed in the present study. First, can protein-induced inhibition of nephrocalcinosis be demonstrated when the diets used are balanced for calcium, magnesium and phosphorus in the added protein? Second, can the protein effect be explained by the frequently observed magnesiuria after giving high-protein diets? Nephrocalcinosis was induced in female rats by giving purified diets containing 151 g casein/kg and either an increased concentration of P (6 v. 2 g/kg) or a decreased concentration of Mg (0·1 v. 0·4 g/kg). To these diets 151 g ovalbumin/kg was added at the expense of glucose, and the diets were balanced for Ca, Mg and P in ovalbumin. The diets were given for 29 d. In rats fed on the diet containing 151 g protein/kg, an increased intake of P or a decreased intake of Mg caused nephrocalcinosis as measured chemically by analysis of kidney Ca as well as histologically by scoring kidney sections stained according to Von Kossa's method. The addition of ovalbumin to the diet prevented the induction of nephrocalcinosis. High P intake and low Mg intake with the low-protein diets induced enhanced loss of albumin in urine, suggesting that nephrocalcinosis caused kidney damage. Increased protein intake with a non-calcinogenic diet also caused increased albumin excretion in urine. Irrespective of the composition of the background diet, increased protein intake caused increased urinary excretion of Mg. When all dietary groups were considered, differences in nephrocalcinosis and urinary Mg output were not proportionally related.

Nephrocalcinosis: Phosphorus: Magnesium: Protein: Rat

Keywords

NephrocalcinosisPhosphorusMagnesiumProteinRat
Type
Metabolism Effects of Diet
Information
British Journal of Nutrition , Volume 67 , Issue 2 , March 1992 , pp. 223 - 233
Copyright
Copyright © The Nutrition Society 1992

References

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