Phosphate Intake's Effect on the Skeletal System - Pilot

2014-08-27 03:50:13 | BioPortfolio


The purpose of this study is to determine the effects of different amounts of phosphorus in the diet on hormones that control phosphorus and bone health both in men who are healthy and in ones who have moderate kidney disease.


Chronic kidney disease affects 11% of the US population; over half of those affected have skeletal manifestations of their renal disease. Renal osteodystrophy is a complex disease, in which multiple mineral systems and related hormones play a role, including phosphate homeostasis. Phosphate regulation primarily depends on renal handling of phosphate, which is partly controlled by parathyroid hormone and vitamin D. However, other mediators in this system clearly exist. Recently, evidence has been accruing that one such factor may be FGF23, a protein produced by osteogenic cells. States of excess FGF23 are associated with marked phosphate wasting, hypophosphatemia, osteomalacia, and inappropriately low calcitriol. FGF23 levels are measurable in healthy humans and markedly elevated in patients who require hemodialysis, although its physiologic role in either state is unknown. Some retrospective evidence suggests that FGF23 is affected by phosphate intake. We are performing a pilot study to gather preliminary data describing the response of FGF23 to changes in dietary phosphorus intake in healthy men and in men with moderate renal insufficiency. The specific aims of this pilot study are: 1) To examine the physiologic effects of alterations in dietary phosphorus on FGF23 in healthy subjects; 2) To examine the physiologic response of FGF23 to dietary phosphorus alterations in patients with moderate renal failure; 3) To assess whether serum levels of 1,25-dihydroxyvitamin D vary inversely with those of FGF23 when dietary phosphate is changed; 4) To determine the temporal pattern of calcitropic hormones and FGF23 in response to dietary phosphate changes; and 5) To determine the variability of the changes in serum FG 23 in response to dietary phosphate manipulations. The proposed research plan is a dietary intervention trial in which we will study the response of serum FGF23 levels to diets with varying phosphorus contents in healthy adults and adults with moderate renal insufficiency.

Study Design

Allocation: Randomized, Control: Active Control, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Crossover Assignment, Masking: Double Blind (Subject, Investigator, Outcomes Assessor), Primary Purpose: Treatment




dietary phosphorus


University of California
San Francisco
United States


Active, not recruiting


University of California, San Francisco

Results (where available)

View Results


Published on BioPortfolio: 2014-08-27T03:50:13-0400

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Medical and Biotech [MESH] Definitions

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Stable phosphorus atoms that have the same atomic number as the element phosphorus, but differ in atomic weight. P-31 is a stable phosphorus isotope.

Unstable isotopes of phosphorus that decay or disintegrate emitting radiation. P atoms with atomic weights 28-34 except 31 are radioactive phosphorus isotopes.

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The amounts of various substances in the diet recommended by governmental guidelines as needed to sustain healthy life.

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