The Impact of Phosphate Metabolism on Healthy Aging

  • End date
    Nov 30, 2022
  • participants needed
  • sponsor
    Yale University
Updated on 23 May 2022
x-linked hypophosphatemia


Determine the association between duration and dose of chronic conventional therapy with Pi and renal (nephrocalcinosis/nephrolithiasis), vascular (endothelial function), and cardiovascular function (echo- cardiography) in patients with hereditary hypophosphatemic rickets with hypercalciuria (HHRH) and patients with X-linked hypophosphatemia (XLH).


The central hypothesis of this proposal is that patients with X-linked hypophosphatemia (XLH), when matched for duration and dose of phosphate (Pi) therapy to patients with hereditary hypophosphatemic rickets with hypercalciuria (HHRH), will evidence greater cardiovascular and vascular debility than patients with HHRH. The overall objectives of this project are to utilize our existing longitudinal databases for individuals with XLH and HHRH through an interdisciplinary collaboration between pediatric and adult endocrinology to: i) quantify the impact of exposure to Pi therapy across the lifespan on cardiovascular and renal complications, which are key aging endpoints, ii) determine the acute response to Pi loading in XLH and HHRH by studying the changes in surrogate markers of cardiovascular and renal function.

Condition Hypophosphatemia, Rickets, Hypercalciuria, XLH, HHRH
Treatment phosphate, phosphate
Clinical Study IdentifierNCT03771105
SponsorYale University
Last Modified on23 May 2022


Yes No Not Sure

Inclusion Criteria

Children above the age of 13 years
Younger and older adults with XLH and HHRH with confirmed NPT2c mutations affecting both copies of the NPT2c gene (HHRH) or one copy of the PHEX gene (XLH)
Be willing to provide access to prior medical records to determine eligibility including imaging, biochemical, medical, and surgical history data
Be willing and able to complete all aspects of the study
Be willing to adhere to the study visit schedule and comply with the assessments (in the opinion of the investigator)

Exclusion Criteria

Subjects will be excluded, if they are children younger than age 13 years
Subjects that have other diseases likely to impact bone and mineral metabolism (e.g. renal, hepatic, gastrointestinal disorders, and malignancy)
Subjects that are currently pregnant
Subjects that received medical therapy or developed any condition, which in the opinion of the investigator, could present a concern for either subject safety or difficulty with data interpretation
Subjects will be excluded from Aim 2, if they are unable to tolerate supplemental phosphate
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