Abstract

Background. Matrix extracellular phosphoglycoprotein (MEPE), first isolated from tumour-derived tissue from a patient with oncogenic hypophosphataemia, is a putative phosphatonin that has received much less attention than fibroblast growth factor-23. To date, its effect on renal tubular phosphate reabsorption remains undefined.

Methods. A renal clearance study was performed in anaesthetized rats infused intravenously with a range of doses of MEPE.

Results. MEPE had no effect on glomerular filtration rate (inulin clearance) but caused rapid, dose-dependent increases in absolute and fractional phosphate excretion, wholly attributable to reduced phosphate reabsorption. At a maximal dose, MEPE increased fractional phosphate excretion more than 2-fold, whereas no change was observed in time controls.

Conclusion. The results lend support to the hypothesis that MEPE contributes to the phosphaturia of oncogenic hypophosphataemia and of hypophosphataemic rickets.

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