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Media Gallery

Approximately 60-70% of dietary phosphate, 1000-1500 mg/day, is absorbed in the small intestine. Although vitamin D can enhance the absorption, especially under conditions of dietary phosphate depletion, intestinal phosphate absorption does not require the presence of active vitamin D. Specifically, high serum phosphate and high dietary phosphate intake do not significantly impair intestinal uptake. The movement of phosphate in and out of bone, the reservoir containing most of the total body phosphate, is generally balanced. Renal excretion of excess dietary phosphate intake ensures maintenance of phosphate homeostasis, maintaining serum phosphate at a level of approximately 3-4 mg/dL in the serum.
The vast majority of filtered phosphate is reabsorbed by type 2a sodium phosphate cotransporters located on the apical membrane of the renal proximal tubule. The expression of these cotransporters is increased by low dietary phosphate intake and several growth factors to enhance phosphate absorption. The expression is decreased by high dietary phosphate intake, parathyroid hormone (PTH), FGF23, and dopamine. Phosphate absorption in the remainder of the nephron is generally mediated by type 3 sodium phosphate cotransporters. No direct evidence has been found related to the regulation of these transporters in renal cells under physiologic conditions. The absorption in the proximal tubule is regulated such that the final excretion matches the dietary excess in order to maintain homeostasis.
Hyperphosphatemia inhibits 1-alpha hydroxylase in the proximal tubule directly and indirectly through stimulation of FGF23, thus inhibiting the conversion of 25-hydroxy vitamin D3 to the active metabolite, 1,25 dihydroxyvitamin D3. FGF23 additionally increases the expression of 24-hydroxylase, leading to inactivation of active 1,25 dihydroxyvitamin D3. The decrease in active vitamin D production with high phosphate is somewhat offset by the ability of hyperphosphatemia to stimulate the secretion of parathyroid hormone (PTH), which will increase the activity of 1-alpha hydroxylase. The result is generally a neutral effect on intestinal phosphate absorption. Hyperphosphatemia-stimulated PTH secretion is mediated through an as yet unidentified pathway. With normal renal function, the transient increase in PTH and decrease in vitamin D serve to inhibit renal and intestinal absorption of phosphate, resulting in resolution of the hyperphosphatemia. In contrast, under conditions of renal failure, sustained hyperphosphatemia results in sustained hyperparathyroidism. The hyperparathyroidism enhances renal phosphate excretion but also enhances bone resorption, releasing more phosphate into the serum. As renal failure progresses and the ability of the kidney to excrete phosphate continues to diminish, the action of PTH on the bone can exacerbate the already present hyperphosphatemia.

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Author

Eleanor Lederer, MD, FASN Professor of Medicine, Chief, Nephrology Division, Director, Nephrology Training Program, Director, Metabolic Stone Clinic, Kidney Disease Program, University of Louisville School of Medicine; Consulting Staff, Louisville Veterans Affairs Hospital

Eleanor Lederer, MD, FASN is a member of the following medical societies: American Association for the Advancement of Science, American Society for Bone and Mineral Research, American Society of Nephrology, American Society of Transplantation, International Society of Nephrology, Kentucky Medical Association, National Kidney Foundation

Disclosure: Serve(d) as a director, officer, partner, employee, advisor, consultant or trustee for: American Society of Nephrology<br/>Received income in an amount equal to or greater than $250 from: Healthcare Quality Strategies, Inc.

Coauthor(s)

Rosemary Ouseph, MD Professor of Medicine, Director of Kidney Transplant, University of Louisville School of Medicine

Rosemary Ouseph, MD is a member of the following medical societies: American Society for Bone and Mineral Research, American Society of Nephrology, American Society of Transplant Surgeons

Disclosure: Nothing to disclose.

Vibha Nayak, MD Assistant Professor of Nephrology, Director of Home Dialysis, Kidney Disease Program, University of Louisville School of Medicine

Vibha Nayak, MD is a member of the following medical societies: American Society of Nephrology

Disclosure: Nothing to disclose.

Chief Editor

Vecihi Batuman, MD, FASN Professor of Medicine, Section of Nephrology-Hypertension, Deming Department of Medicine, Tulane University School of Medicine

Vecihi Batuman, MD, FASN is a member of the following medical societies: American College of Physicians, American Society of Hypertension, American Society of Nephrology, Southern Society for Clinical Investigation

Disclosure: Nothing to disclose.

Acknowledgements

Jeffrey L Arnold, MD, FACEP Chairman, Department of Emergency Medicine, Santa Clara Valley Medical Center

Jeffrey L Arnold, MD, FACEP is a member of the following medical societies: American Academy of Emergency Medicine and American College of Physicians

Disclosure: Nothing to disclose. Andrew J Dailey, MD Fellow, Department of Medicine, Division of Nephrology, University of Louisville School of Medicine