Abstract
The phosphatonin, secreted frizzled-related protein-4 (sFRP-4), induces phosphaturia and inhibits 25-hydroxyvitamin D 1α-hydroxylase activity normally induced in response to hypophosphatemia. To determine the mechanism by which sFRP-4 alters renal phosphate (Pi) transport, we examined the effect of sFRP-4 on renal brush border membrane (BBMV) Na+-dependent Pi uptake, and the abundance and localization of the major Na+–Pi-IIa co-transporter in proximal tubules and opossum kidney (OK) cells. Infusion of sFRP-4 increased renal fractional excretion of Pi and decreased renal β-catenin concentrations. The increase in renal Pi excretion with sFRP-4 infusion was associated with a 21.9±3.4% decrease in BBMV Na+-dependent Pi uptake (P<0.001) compared with a 39.5±2.1% inhibition of Na+-dependent Pi transport in renal BBMV induced by PTH (P<0.001). sFRP-4 infusion was associated with a 30.7±4.8% decrease in Na+–Pi-IIa co-transporter protein abundance (P<0.01) assessed by immunoblotting methods compared to a 45.4±8.8% decrease induced by PTH (P<0.001). In OK cells, sFRP-4 reduced surface expression of a heterologous Na+–Pi-IIa co-transporter. We conclude that sFRP-4 increases renal Pi excretion by reducing Na+–Pi-IIa transporter abundance in the brush border of the proximal tubule through enhanced internalization of the protein.
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Acknowledgments
The authors wish to thank Stacy Sommer for assistance in the animal experiments. These studies were supported by NIH grant DK 65830 to R. Kumar, the Swiss National Science Foundation (31-65397.01) to H. Murer, and the sixth European Frame Work EuReGene Project (005085) to C. A. Wagner and H. Murer. Theresa J. Berndt and Bernhard Bielesz contributed equally to this work.
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Berndt, T.J., Bielesz, B., Craig, T.A. et al. Secreted frizzled-related protein-4 reduces sodium–phosphate co-transporter abundance and activity in proximal tubule cells. Pflugers Arch - Eur J Physiol 451, 579–587 (2006). https://doi.org/10.1007/s00424-005-1495-2
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DOI: https://doi.org/10.1007/s00424-005-1495-2