Parathyroid Hormone (PTH) Homeostasis in Bartter Syndrome
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|ClinicalTrials.gov Identifier: NCT01021280|
Recruitment Status : Unknown
Verified June 2012 by Daniel Landau MD, Soroka University Medical Center.
Recruitment status was: Not yet recruiting
First Posted : November 26, 2009
Last Update Posted : June 14, 2012
Parathyroid hormone (PTH) gland calcium sensing receptor (CASR) regulates PTH secretion. CASR is also expressed in nephron thick ascending limb (TAL). Bartter syndrome (BS), a normotensive hypokalemic tubulopathy, may be due to mutations in different TAL channels, including the potassium channel ROMK. Mutations in CASR may also cause BS through its effects on ROMK function. However, it is unknown whether ROMK mutations exert any effects on CASR function and PTH physiology. Preliminary data from our center shows that PTH levels were specifically elevated in type II (where ROMK is mutated) and not in type IV (where another gene, Barttin is defective) BS, without a common explanation. We assume that the mutation in ROMK may cause a dysregulation of PTH secretion via possible interaction with CASR.
The purpose of this study is: to investigate the PT-gland function and regulation in BS.
Methods: Patients with BS type II and IV and normal controls will undergo a standard protocol of controlled ionic hypo- and hypercalcemia, during which PTH secretion, phosphate balance and calcium excretion will be followed. Calcium Vs PTH response curves will be generated and compared.
Expected impact and benefit: the results of this study will help understand the mechanisms of PTH regulation beyond CASR.
|Condition or disease|
|Study Type :||Observational|
|Estimated Enrollment :||15 participants|
|Official Title:||Case-control Study of the PTH Homeostasis in Adolescents and Young Adults With Bartter Syndrome|
|Study Start Date :||January 2013|
|Estimated Primary Completion Date :||December 2013|
|Estimated Study Completion Date :||June 2014|
Type II BS
Adolescents and young adults with type II Bartter syndrome
Type IV BS
Adolescents and adults with type IV Bartter syndrome
Age and sex- matched controls
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01021280
|Soroka University medical Center|
|Beer Sheva, Israel, 84101|
|Contact: Daniel Landau, MD 972-8-6400546 email@example.com|
|Contact: Ruth Schreiber, MD 972-8-6400546 firstname.lastname@example.org|
|Principal Investigator: Daniel Landau, MD|
|Sub-Investigator: Ruth Schreiber, MD|