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Endothelial Progenitor Cells and Nitric Oxide in Cardiac Rehabilitation Program Participants

This study has been completed.
Sponsor:
Information provided by:
National Institutes of Health Clinical Center (CC)
ClinicalTrials.gov Identifier:
NCT00308633
First received: March 28, 2006
Last updated: October 31, 2009
Last verified: October 2009
  Purpose

This study will measure blood levels of endothelial progenitor cells (EPCs) and nitric oxide (NO) in patients with coronary artery disease (CAD) who are participating in a 3-month cardiac rehabilitation program at Suburban Hospital in Bethesda, MD. EPCs are a kind of stem cell produced by the bone marrow that can develop into cells found in arteries and in the heart and, therefore, can repair diseased vessels. The study will examine whether the EPCs are affected by exercise and will look at how they may contribute to repair of cells lining the diseased arteries as a result of participation in the rehabilitation program.

People with coronary artery disease may be eligible for this study. Candidates are screened with a medical history, physical examination, electrocardiogram, and blood tests. CAD patients also to a treadmill exercise test.

Volunteers' participation ends at the screening visit. The blood drawn at screening is used to identify EPC specific genes to compare with the EPC genes from patients with CAD.

CAD patients participate in Suburban Hospital's cardiac rehabilitation program. The exercise portion of the program includes 36 sessions of about 60 minutes each, spaced over approximately 3 months. Patients have a baseline blood test at screening and repeat blood tests at the end of each month of participation in the rehabilitation program. Some of the blood will be used for genetic tests to see how genes of the EPCs are changed by the patient's participation in the rehabilitation program.


Condition
Coronary Artery Disease (CAD)

Study Type: Observational
Official Title: Mechanism and Vascular Effects of Endothelial Progenitor Cell Mobilization in Patients With Coronary Artery Disease Undergoing Cardiac Rehabilitation

Resource links provided by NLM:


Further study details as provided by National Institutes of Health Clinical Center (CC):

Estimated Enrollment: 55
Study Start Date: March 2006
Primary Completion Date: December 2007 (Final data collection date for primary outcome measure)
Detailed Description:

Exercise training has long been recommended as a means of improving effort tolerance and reducing morbidity and mortality in patients with coronary artery disease (CAD). One mechanism of benefit may be through improved endothelial function with enhanced nitric oxide (NO) bioactivity. Such an effect may augment blood flow to exercising skeletal muscle and to the myocardium, and reduce vascular inflammation, platelet activation and adherence which could diminish the risk of thrombosis. In 46 patients with CAD, participating in the Suburban Hospital cardiac rehabilitation program (Protocol 03-H-0086), we detected increases in circulating endothelial progenitor cells (EPCs), which may have the capacity to repair diseased or dysfunctional endothelium. In the last 23 participants (following amendment of the protocol) a subset showed increase in whole blood nitrite - a marker of intravascular NO - at completion of program. However, not all patients showed EPC mobilization or increased intravascular NO despite compliant program participation and improved effort tolerance. One possibility is that EPCs from patients who fail to derive vascular benefit as evidenced by increased intravascular NO may have different EPC gene expression profiles at baseline or in response to repetitive exercise, resulting in diminished protection of EPCs against oxidant stress with initiation of apoptosis, compared with EPC gene expression in patients who show evidence of EPC mobilization and endothelial repair. The purpose of our study is to 1) Prospectively demonstrate a relationship between EPC mobilization and increased whole blood nitrite as a marker of improved vascular NO bioactivity due to EPC mobilization, and 2) Determine EPC gene expression profiles, with a focus on activation or suppression of genes whose products regulate intravascular redox potential, apoptosis and growth factor and cytokine secretion. We hypothesize that activation or suppression of critical genes in EPCs at baseline or during exercise may determine EPC mobilization, endothelial differentiation and vascular repair potential as evidenced by increased intravascular NO.

  Eligibility

Ages Eligible for Study:   21 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes
Criteria
  • INCLUSION CRITERIA:

Adults older than 21 years.

Coronary artery disease established by angiography.

At least two months interval since myocardial infarction or coronary artery bypass surgery.

At least one month interval since percutaneous coronary intervention or congestive heart failure symptoms.

No medical condition that might prohibit safe participation in cardiac rehabilitation.

Subject understands protocol and provides written, informed consent in addition to willingness to comply with specified follow-up evaluations.

EXCLUSION CRITERIA:

Significant structural heart disease (e.g. hypertrophic or dilated cardiomyopathy, valvular heart disease) as determined by echocardiography.

Angina pectoris that is prolonged in duration (greater than 20 minutes), or does not respond to nitroglycerin (2 tablets) within 2 weeks of referral to the program.

Subjects physically unable to perform cardiac rehabilitation protocol due to neurologic or orthopedic conditions.

Women of childbearing age unless recent pregnancy test is negative.

Lactating women.

Implantable cardioverter-defibrillator (ICD)

  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00308633

Locations
United States, Maryland
National Institutes of Health Clinical Center, 9000 Rockville Pike
Bethesda, Maryland, United States, 20892
Suburban Hospital
Bethesda, Maryland, United States, 20814
Sponsors and Collaborators
  More Information

Publications:
ClinicalTrials.gov Identifier: NCT00308633     History of Changes
Other Study ID Numbers: 060122, 06-H-0122
Study First Received: March 28, 2006
Last Updated: October 31, 2009
Health Authority: United States: Federal Government

Keywords provided by National Institutes of Health Clinical Center (CC):
Cardiac Rehabilitation
Apoptosis
Gene Expression
Nitric Oxide
Reactive Oxygen Species
Coronary Artery Disease
CAD

Additional relevant MeSH terms:
Coronary Artery Disease
Coronary Disease
Myocardial Ischemia
Arterial Occlusive Diseases
Arteriosclerosis
Cardiovascular Diseases
Heart Diseases
Vascular Diseases
Nitric Oxide
Anti-Asthmatic Agents
Antioxidants
Autonomic Agents
Bronchodilator Agents
Cardiovascular Agents
Endothelium-Dependent Relaxing Factors
Free Radical Scavengers
Gasotransmitters
Molecular Mechanisms of Pharmacological Action
Neurotransmitter Agents
Peripheral Nervous System Agents
Pharmacologic Actions
Physiological Effects of Drugs
Protective Agents
Respiratory System Agents
Therapeutic Uses
Vasodilator Agents

ClinicalTrials.gov processed this record on November 23, 2014