Study of Propranolol as Anti-Adhesive Therapy in Sickle Cell Disease (SCD)

This study is ongoing, but not recruiting participants.
Sponsor:
Collaborator:
Information provided by (Responsible Party):
Laura M. De Castro, Duke University Medical Center
ClinicalTrials.gov Identifier:
NCT01077921
First received: February 26, 2010
Last updated: April 29, 2013
Last verified: April 2013
  Purpose

An open label, prospective, randomized cross-over phase II study in up to 60 sickle cell patients who are either homozygous for Hb S or have HbSB0 thalassemia. Initially, each patient will be treated for 6 weeks with placebo or a standard dose of propranolol (40 mg) every 12 hrs. This will be followed by a 2-week washout period after which, patients will receive the other treatment modality (placebo or propranolol).

We Hypothesize that propranolol administered in vivo on a daily basis for 6 weeks (1) will decrease baseline adhesion to endothelial cells and will substantially abrogate epinephrine-stimulated adhesion to endothelial cells, as measured in vitro; (2) will improve biomarkers of endothelial activation and dysfunction; and (3) can be safely used in patients with SCD. Thus, the use of propranolol in SCD may represent a safe and effective means of anti-adhesive therapy in SCD.

Study Objectives:

Primary Objective:

• To establish the safety and efficacy of long-term therapy with propranolol as an anti-adhesive therapy for SCD.

Secondary Objective:

• To evaluate changes in soluble markers of endothelial activation and dysfunction.

Correlative Science Objective:

• To determine whether response to propranolol therapy is associated with polymorphisms in genes encoding the proteins involved in the upregulation of SS RBC adhesion by epinephrine.


Condition Intervention Phase
Sickle Cell Disease
Drug: Propranolol
Drug: Placebo
Phase 2

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Crossover Assignment
Masking: Double Blind (Subject, Caregiver, Investigator)
Primary Purpose: Treatment
Official Title: Phase II Study of Propranolol as Anti-Adhesive Therapy for Sickle Cell Disease

Resource links provided by NLM:


Further study details as provided by Duke University:

Primary Outcome Measures:
  • Establish the safety and efficacy of long-term therapy with propranolol as an anti-adhesive therapy for SCD [ Time Frame: 16 weeks ] [ Designated as safety issue: Yes ]
    The stickiness of SS RBC will be evaluated by a well-established in vitro assay of adhesion of SS RBCs to cultured endothelial cells using a flow chamber. Each patient participant will be carefully monitored for any adverse events. Specifically, we will monitor the following: hemoglobin, hematocrit, and changes in cardiovascular parameters (HR, BP, 02 saturation). Also occurrence of symptoms and medical complications will be monitored.


Secondary Outcome Measures:
  • Evaluate changes in soluble markers of endothelial activation and dysfunction. [ Time Frame: 16 weeks ] [ Designated as safety issue: No ]
    Plasma levels of sVCAM-1, sICAM-1, sE-selectin, and sP-selectin will be measured on plasma samples using ELISA kits. We theorize that reduction in SS RBC adhesion to endothelium due to chronic propranolol therapy will reduce endothelial activation and dysfunction, since SS RBC adhesion has been previously shown to induce expression of such markers in vitro. All patient participants will also have genotyping performed on two specific genes, ADRB2 and ADCY6. Polymorphisms in these genes have been associated with adhesion of RBCs to laminin.


Enrollment: 27
Study Start Date: June 2010
Estimated Study Completion Date: July 2013
Primary Completion Date: March 2013 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Propranolol
Drug arm
Drug: Propranolol
Treatment will be with a standard propranolol dose of 40 mg every 12 hrs.Each patient will participate in 6 weeks of treatment with placebo or study drug (propranolol), followed by a 2-week wash-out period and then 6 weeks of treatment with the other modality (placebo or propranolol).
Placebo Comparator: Sugar pill
Placebo arm
Drug: Placebo
Treatment will be with a standard propranolol dose of 40 mg every 12 hrs.Each patient will participate in 6 weeks of treatment with placebo or study drug (propranolol), followed by a 2-week wash-out period and then 6 weeks of treatment with the other modality (placebo or propranolol).

  Eligibility

Ages Eligible for Study:   18 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No
Criteria

Inclusion Criteria:

  • Diagnosis by electrophoresis (HEP) of Hemoglobin (Hgb) SS or Hgb Sβ0 thalassemia (all patients followed at our clinic have HEP-confirmed diagnosis on file)
  • Age ≥ 18 years
  • Blood pressure (BP) Systolic ≥ 95mm Hg and Diastolic ≥ 50mm Hg
  • Heart rate (HR) ≥ 70 and ≤ 110 bpm
  • Oxygen saturation by pulse oximeter and at room air ≥ 92%
  • Hematocrit (Hct) ≥ 20% and Hb > 6.0 g/dL
  • Euthyroid status as indicated by normal TSH
  • SS RBCs obtained during screening period demonstrating an adhesion response to epinephrine of 40% over non-stimulated baseline adhesion to endothelial cells
  • Capacity to understand and sign informed consent

Exclusion Criteria:

  • History of vaso-occlusive episode during the 6 wks prior to screening
  • RBC transfusion during the 3 months prior to study entry
  • Ongoing pregnancy
  • History of heart failure, MI, bradyarrhythmias, conduction defects
  • History of asthma or reactive airway disease
  • History of thyroid disease
  • Diabetes
  • Renal insufficiency (BUN >21 mg/dL and/or Creatinine >1.4 mg/dL)
  • Use during the screening or study period of any of the following medications: antihypertensives, diuretics, thyroid replacement therapy, anti-arrhythmia medications, bronchodilators, inhaled steroids, insulin, or hypoglycemic medication
  • History of allergy to sulfonamides
  Contacts and Locations
Please refer to this study by its ClinicalTrials.gov identifier: NCT01077921

Locations
United States, North Carolina
Duke University Medical Center
Durham, North Carolina, United States, 27710
Sponsors and Collaborators
Laura M. De Castro
  More Information

Publications:
Responsible Party: Laura M. De Castro, Associate Professor, Duke University Medical Center
ClinicalTrials.gov Identifier: NCT01077921     History of Changes
Other Study ID Numbers: Pro00018427, K01 HL96434-02., 5 R21 HL096123-02
Study First Received: February 26, 2010
Last Updated: April 29, 2013
Health Authority: United States: Food and Drug Administration

Keywords provided by Duke University:
sickle
adhesion
propranolol

Additional relevant MeSH terms:
Anemia, Sickle Cell
Anemia, Hemolytic, Congenital
Anemia, Hemolytic
Anemia
Hematologic Diseases
Hemoglobinopathies
Genetic Diseases, Inborn
Propranolol
Anti-Arrhythmia Agents
Cardiovascular Agents
Therapeutic Uses
Pharmacologic Actions
Antihypertensive Agents
Adrenergic beta-Antagonists
Adrenergic Antagonists
Adrenergic Agents
Neurotransmitter Agents
Molecular Mechanisms of Pharmacological Action
Physiological Effects of Drugs
Vasodilator Agents

ClinicalTrials.gov processed this record on April 23, 2014