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Phosphate Intake's Effect on the Skeletal System - Pilot

This study has been completed.
Information provided by (Responsible Party):
University of California, San Francisco Identifier:
First received: September 13, 2005
Last updated: October 8, 2013
Last verified: October 2013
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.

Condition Intervention
Kidney Failure, Chronic
Behavioral: dietary phosphorus

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double Blind (Participant, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Phosphate Intake's Effect on the Skeletal System Calcitropic Hormones and FGF23 - Pilot Study

Resource links provided by NLM:

Further study details as provided by University of California, San Francisco:

Primary Outcome Measures:
  • urine phosphorus [ Time Frame: Daily ]

Enrollment: 27
Study Start Date: March 2004
Study Completion Date: July 2008
Primary Completion Date: July 2008 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: 1
dietary phosphorus
Behavioral: dietary phosphorus
varying amts dietary phosphorus
Active Comparator: 2
Behavioral: dietary phosphorus
varying amts dietary phosphorus

Detailed Description:
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.

Ages Eligible for Study:   21 Years to 65 Years   (Adult)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Healthy Men 21-65 years old with Creatinine clearance > 70 ml/min/1.73 m2 as calculated using the equation derived from the Modification of Diet in Renal Disease (MDRD) study
  • Men 21-65 years old with Creatinine clearance between 30 and 59 ml/min/1.73 m2 as calculated using the equation derived from the MDRD study31

Exclusion Criteria:

  • Medications affecting bone metabolism
  • Abnormal liver or GI function
  • Extreme electrolyte abnormalities
  • BMI >30 kg/m2
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Please refer to this study by its identifier: NCT00187629

United States, California
University of California
San Francisco, California, United States, 94143
Sponsors and Collaborators
University of California, San Francisco
Principal Investigator: Diana M Antoniucci, MD University of California, San Francisco
  More Information

Responsible Party: University of California, San Francisco Identifier: NCT00187629     History of Changes
Other Study ID Numbers: H40550-24730
Study First Received: September 13, 2005
Last Updated: October 8, 2013

Additional relevant MeSH terms:
Renal Insufficiency
Kidney Failure, Chronic
Kidney Diseases
Urologic Diseases
Renal Insufficiency, Chronic processed this record on April 28, 2017