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Magnesium stimulates renal phosphate reabsorption.

Julia Thumfart1, Susanne Jung, Salah Amasheh

  • 1Department of Pediatric Nephrology, Charité University Children's Hospital, Augustenburger Platz 1, 13353 Berlin, Germany.

American Journal of Physiology. Renal Physiology
|August 15, 2008
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High dietary magnesium intake enhances kidney phosphate reabsorption by increasing NaPi-IIa and NaPi-IIc transporters. This effect is partly dependent on parathyroid hormone (PTH) for NaPi-IIa but not NaPi-IIc.

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Area of Science:

  • Nephrology
  • Renal Physiology
  • Mineral Metabolism

Background:

  • Renal phosphate (Pi) reabsorption, primarily in the proximal tubule, is crucial for maintaining phosphate homeostasis.
  • Sodium-dependent phosphate cotransporters NaPi-IIa and NaPi-IIc in the brush-border membrane (BBM) regulate Pi handling.
  • NaPi-IIa expression is modulated by dietary Pi and parathyroid hormone (PTH).

Purpose of the Study:

  • To investigate the impact of altered dietary magnesium (Mg2+) intake on renal Pi handling.
  • To determine the molecular mechanisms by which Mg2+ influences renal Pi reabsorption.
  • To elucidate the role of PTH in Mg2+-mediated changes in Pi transport.

Main Methods:

  • Rats were fed diets with normal (0.2%) or high (2.5%) Mg2+ concentrations.
  • Urinary Pi excretion and renal expression of NaPi-IIa and NaPi-IIc were assessed.
  • Experiments were repeated in parathyroidectomized (PTX) rats to evaluate PTH dependency.

Main Results:

  • High Mg2+ diet decreased urinary Pi excretion and increased NaPi-IIa and NaPi-IIc protein expression.
  • Serum PTH levels slightly decreased, while FGF-23 remained unchanged with high Mg2+ diet.
  • In PTX rats, Mg2+ did not affect Pi excretion or NaPi-IIa expression, but increased NaPi-IIc expression.

Conclusions:

  • Dietary Mg2+ significantly influences renal Pi handling, promoting Pi reabsorption.
  • NaPi-IIa regulation by high Mg2+ is PTH-dependent.
  • NaPi-IIc regulation by high Mg2+ appears to be PTH-independent, suggesting a distinct regulatory pathway.