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Endothelin Receptor Antagonism in Proteinuric Nephropathy

This study has been completed.
British Heart Foundation
Information provided by:
University of Edinburgh Identifier:
First received: July 23, 2008
Last updated: NA
Last verified: August 2006
History: No changes posted
The number of people with kidney problems is increasing rapidly, related in part to the increasing prevalence of diabetes. Patients with kidney problems tend to have protein leaking into the urine (proteinuria). Both proteinuria and the kidney disease itself are associated with an increased risk of heart disease. Reducing proteinuria is an important treatment goal in people with kidney problems. Endothelin is a chemical produced both by blood vessels and the kidney. Higher than normal levels of endothelin are thought to contribute to progression of kidney disease and proteinuria. By using drugs that block the effects of endothelin ('endothelin receptor antagonists') we can hopefully reduce both of these. The purpose of the study is to ascertain whether endothelin receptor antagonists improve kidney function and reduce proteinuria more so than other commonly used drugs.

Condition Intervention Phase
Chronic Kidney Disease Proteinuria Drug: BQ-123 (selective endothelin A receptor antagonist) Drug: 0.9 % saline Drug: Nifedipine Phase 1

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Triple (Participant, Investigator, Outcomes Assessor)
Primary Purpose: Basic Science
Official Title: The Systemic & Renal Effects of Endothelin Receptor Antagonism in Proteinuric Nephropathy

Resource links provided by NLM:

Further study details as provided by University of Edinburgh:

Primary Outcome Measures:
  • Proteinuria [ Time Frame: Acute change in proteinuria over 4 hour period following BQ-123 dosing ]
  • Blood pressure [ Time Frame: Acute change in blood pressure over 4 hour period following BQ-123 dosing ]

Secondary Outcome Measures:
  • Arterial stiffness (as measured by pulse wave velocity) [ Time Frame: Acute change in arterial stiffness over 4 hour period following BQ-123 dosing ]
  • Endothelial function (as measured by flow-mediated dilatation) [ Time Frame: Acute change in endothelial function over 4 hour period following BQ-123 dosing ]

Enrollment: 22
Study Start Date: May 2006
Study Completion Date: December 2007
Primary Completion Date: November 2007 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Placebo Comparator: 1
Placebo control arm of study
Drug: 0.9 % saline
Single 15ml 0.9% saline infused for 15 mins as placebo control
Experimental: 2
BQ-123 arm of study
Drug: BQ-123 (selective endothelin A receptor antagonist)
Single dose of BQ-123 given at a dose of 1000 nmol/min for 15 min intravenously.
Active Comparator: 3
Nifedipine arm of study
Drug: Nifedipine
Single dose of nifedipine 10 mg given orally as active control
Other Name: Adalat

Detailed Description:

Response to ETA Receptor Antagonism/Nifedipine/Placebo Prior to the study visit subjects will be asked to refrain from alcohol for 24 hours. Tea and coffee will not be permitted for at least 12 hours before each visit. Studies will be conducted in a quiet, temperature-controlled room.

On arrival at the Clinical Research Centre on the study day, a brief medical enquiry and examination will confirm the ongoing suitability of the subject for the study. An intravenous cannula will be inserted into the antecubital fossa of each arm. We have developed a basic protocol described fully in our previous studies that allows us to measure systemic haemodynamics by the well validated technique of bioimpedance and renal function by standard para-aminohippurate (PAH; renal blood flow) and inulin (glomerular filtration rate) clearance studies.

Urinary protein excretion will be measured by collecting urine over 30 minute time periods. To ascertain the contribution of renal haemodynamics to any change in protein excretion renal blood flow and glomerular filtration rate will be measured. In addition, blood and urine will also be assayed for sodium, creatinine and osmolality to allow calculation of fractional excretion of sodium and free water clearance.

Systemic haemodynamic monitoring will be performed at 15 minute intervals during drug/placebo administration and at 30 minute intervals outwith these periods.


Ages Eligible for Study:   18 Years to 70 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Male or female
  • Age 18-70
  • Body mass index <35
  • Blood pressure <160/110 mmHg
  • CKD stage 2-5 as per the K/DOQI classification
  • Proteinuria in one of the following categories: 0.3-1.5, >1.5-3.0, and >3.0-6.0 g/24hrs
  • Normal serum albumin

Exclusion Criteria:

  • Subject is below the age of legal consent, or is mentally or legally incapacitated
  • History of multiple and/or severe allergic reactions to drugs (including study drugs), or food
  • The subject has donated blood (450 ml) within the last 4 weeks
  • Past or present drug or alcohol abuse including intravenous drug abuse at any time
  • Participation in another clinical trial within 1 month
  • Considered to be at high risk of HIV or hepatitis B
  • Pregnant
  Contacts and Locations
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Please refer to this study by its identifier: NCT00722215

United Kingdom
Clinical Research Centre, Western General Hospital
Edinburgh, Scotland, United Kingdom, EH4 2XU
Sponsors and Collaborators
University of Edinburgh
British Heart Foundation
Principal Investigator: Neeraj Dhaun, MBChB The University of Edinburgh
Study Director: David J Webb, MD The University of Edinburgh
  More Information

Responsible Party: Dr Neeraj Dhaun, The University of Edinburgh Identifier: NCT00722215     History of Changes
Other Study ID Numbers: 2006/WCRC/02
Study First Received: July 23, 2008
Last Updated: July 23, 2008

Keywords provided by University of Edinburgh:
Endothelin antagonist
Chronic kidney disease
Cardiovascular disease
Blood pressure
Arterial stiffness
Endothelial function

Additional relevant MeSH terms:
Kidney Diseases
Renal Insufficiency, Chronic
Urologic Diseases
Renal Insufficiency
Urination Disorders
Urological Manifestations
Signs and Symptoms
Endothelin A Receptor Antagonists
Calcium Channel Blockers
Membrane Transport Modulators
Molecular Mechanisms of Pharmacological Action
Vasodilator Agents
Tocolytic Agents
Reproductive Control Agents
Physiological Effects of Drugs
Antihypertensive Agents
Endothelin Receptor Antagonists processed this record on September 21, 2017