Coronary ArteriosclerosisNCT00013975
Endothelial Progenitor Cells and Risk Factors for Coronary Artery Disease
An observational study of Coronary Arteriosclerosis, run by National Heart, Lung, and Blood Institute (NHLBI) at 1 site in United States.
Trial summary
This study will measure and compare the levels of endothelial progenitor cells (EPCs) in the blood of people with and without risk factors for atherosclerosis (hardening of the arteries) to see if there is a relationship between these cells and cardiovascular risk factors such as smoking, high cholesterol level and… Read more about this study
- Who is it for?
- Any age
- Conditions the study is for
- Coronary Arteriosclerosis
- How many people
- 120 participants
- Where
- 1 siteUnited States
- Study dates
- Mar 2001to Mar 2003
- Phase
- Observational
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages Any age
- All sexes
- No healthy volunteers
- Child, Adult, Older adult
Who may be able to join
- Men: aged 21 and above with or without cardiovascular risk factors
- Women - post menopausal (based on clinical history) with and without cardiovascular risk factors
Who cannot join
- Pre-menopausal women
- History of cancer
- Evidence of proliferative retinopathy
- History of migraine-type headache
- History of cluster headache
- History of raised intraocular pressure
Show all 12Show fewer
- History of raised intracranial pressure
- Hypersensitivity to organic nitrates
- History of hyperthyroidism
- Any intercurrent illness
- Any other chronic disease not including cardiovascular risk factors.
- No current medications including vitamins for at least 1 week.
Trial locations and contacts
1 site in 1 country.
United States1 site
National Heart, Lung and Blood Institute (NHLBI)
Bethesda, Maryland, 20892
About this study
This study will measure and compare the levels of endothelial progenitor cells (EPCs) in the blood of people with and without risk factors for atherosclerosis (hardening of the arteries) to see if there is a relationship between these cells and cardiovascular risk factors such as smoking, high cholesterol level and high blood pressure.
Healthy male volunteers between the ages of 21 and 55 years with and without heart disease risk factors may be eligible for this study. Candidates must have no evidence of coronary or peripheral vascular disease, proliferative retinopathy, or other chronic disease and no history of cancer, migraine-type headache, cluster headache, raised intraocular pressure, raised intracranial pressure, hyperthyroidism.
Read more
Participants will undergo the following procedures at the NIH Clinical Center:
- Medical history and physical examination
- Blood tests to measure EPC level and various risk and growth factors
- Brachial reactivity study - This ultrasound study tests how well the subject's arteries widen. The subject rests on a bed for 30 minutes. An ultrasound measuring device is placed over the artery just above the elbow. The size of the artery and blood flow through it are measured before and after inflating a pressure cuff around the forearm. The pressure cuff stops the flow of blood to the arm for a few minutes. After a 15-minute rest, the drug nitroglycerin is sprayed under the subject's tongue. Before the nitroglycerin spray and 3 minutes after it, the size of the artery and blood flow through it are measured again.
Read the detailed description
Evidence suggests that risk factors for atherosclerosis contribute to atherogenesis by causing endothelial injury. However, little is known about determinants of endothelial cell repair and regeneration. We propose that mobilization of endothelial progenitor cells (EPCs) constitutes one mechanism for ongoing endothelial repair. EPCs are a bone marrow derived cell population that can be isolated from peripheral blood. Among human peripheral mononuclear cells, EPCs are relatively abundant with an estimated frequency of 1 in 500 to 1 in 1000 cells. Evidence suggests that EPCs can participate in angiogenesis under pathophysiological circumstances. Under normal conditions, however, adult organisms undergo little if any active angiogenesis. One explanation for this set of observations is that high circulating levels of EPCs may exist to allow these cells to participate in functions beyond angiogenesis. We hypothesize that one such function is in the repair of ongoing endothelial injury. To test this hypothesis, we will measure peripheral blood EPC activity by ascertaining the number of EPC colony forming units from peripheral blood sampling. We intend to correlate this biological determinant with the degree of endothelial dysfunction assessed by flow-mediated brachial artery reactivity, and an atherosclerotic risk stratification method developed by the Framingham study. We hypothesize that a correlation will exist between the atherosclerotic risk profile, endothelial function and EPC activity and that the EPC activity will therefore become a novel surrogate biological marker for cumulative cardiovascular risk.
- Conditions
- Coronary Arteriosclerosis
- Keywords
- Framingham Risk Scoring, Brachial Artery Reactivity, EPC Colony Assay, Healthy Volunteer, Atherosclerosis Risk Factors, Cholesterol, Hypertension, Smoking, Diabetes, Postmenopausal, Heart Disease Risk Factors, Risk Factors
- Medical subject headings
- Coronary Artery Disease, Hypertension, Smoking, Diabetes Mellitus
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted5 Apr 2001 (estimated)
- Study startMar 2001
- Study completionMar 2003
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (3)Papers the sponsor has linked to this study.
- Other trials for Coronary ArteriosclerosisStudies of the same condition, open and under way.
- More trials run by National Heart, Lung, and Blood Institute (NHLBI)The sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Enrolment
- 120 participants
Sponsor and investigators
- Sponsor type
- US National Institutes of Health
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00013975
- Sponsor's protocol ID
- 010119
- Other IDs
- 01-H-0119
- Status last verified
- Mar 2003
- First submitted
- 4 Apr 2001
- Last updated
- 4 Mar 2008
- Results posted
- No
Publications
Shi Q, Rafii S, Wu MH, Wijelath ES, Yu C, Ishida A, Fujita Y, Kothari S, Mohle R, Sauvage LR, Moore MA, Storb RF, Hammond WP. Evidence for circulating bone marrow-derived endothelial cells. Blood. 1998 Jul 15;92(2):362-7.
PubMed 9657732Asahara T, Murohara T, Sullivan A, Silver M, van der Zee R, Li T, Witzenbichler B, Schatteman G, Isner JM. Isolation of putative progenitor endothelial cells for angiogenesis. Science. 1997 Feb 14;275(5302):964-7. doi: 10.1126/science.275.5302.964.
PubMed 9020076Ross R. The pathogenesis of atherosclerosis: a perspective for the 1990s. Nature. 1993 Apr 29;362(6423):801-9. doi: 10.1038/362801a0.
PubMed 8479518
Study at a glance
From the registry record, last updated by the sponsor on 4 Mar 2008. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Endothelial Progenitor Cells and Risk Factors for Coronary Artery Disease
- ClinicalTrials.gov ID
- NCT00013975
- Acronym / sponsor ID
- 010119
- Conditions
- Coronary Arteriosclerosis
- Keywords
- Framingham Risk Scoring, Brachial Artery Reactivity, EPC Colony Assay, Healthy Volunteer, Atherosclerosis Risk Factors, Cholesterol, Hypertension, Smoking
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 120 participants
- Lead sponsor
- National Heart, Lung, and Blood Institute (NHLBI)US National Institutes of Health
- Study start
- Mar 2001
- Study completion
- Mar 2003
- First posted
- 5 Apr 2001 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This study will measure and compare the levels of endothelial progenitor cells (EPCs) in the blood of people with and without risk factors for atherosclerosis (hardening of the arteries) to see if there is a relationship between these cells and cardiovascular risk factors such as smoking, high cholesterol level and high blood pressure.
Healthy male volunteers between the ages of 21 and 55 years with and without heart disease risk factors may be eligible for this study. Candidates must have no evidence of coronary or peripheral vascular disease, proliferative retinopathy, or other chronic disease and no history of cancer, migraine-type headache, cluster headache, raised intraocular pressure, raised intracranial pressure, hyperthyroidism.
Participants will undergo the following procedures at the NIH Clinical Center:
- Medical history and physical examination
- Blood tests to measure EPC level and various risk and growth factors
- Brachial reactivity study - This ultrasound study tests how well the subject's arteries widen. The subject rests on a bed for 30 minutes. An ultrasound measuring device is placed over the artery just above the elbow. The size of the artery and blood flow through it are measured before and after inflating a pressure cuff around the forearm. The pressure cuff stops the flow of blood to the arm for a few minutes. After a 15-minute rest, the drug nitroglycerin is sprayed under the subject's tongue. Before the nitroglycerin spray and 3 minutes after it, the size of the artery and blood flow through it are measured again.
Detailed description
Evidence suggests that risk factors for atherosclerosis contribute to atherogenesis by causing endothelial injury. However, little is known about determinants of endothelial cell repair and regeneration. We propose that mobilization of endothelial progenitor cells (EPCs) constitutes one mechanism for ongoing endothelial repair. EPCs are a bone marrow derived cell population that can be isolated from peripheral blood. Among human peripheral mononuclear cells, EPCs are relatively abundant with an estimated frequency of 1 in 500 to 1 in 1000 cells. Evidence suggests that EPCs can participate in angiogenesis under pathophysiological circumstances. Under normal conditions, however, adult organisms undergo little if any active angiogenesis. One explanation for this set of observations is that high circulating levels of EPCs may exist to allow these cells to participate in functions beyond angiogenesis. We hypothesize that one such function is in the repair of ongoing endothelial injury. To test this hypothesis, we will measure peripheral blood EPC activity by ascertaining the number of EPC colony forming units from peripheral blood sampling. We intend to correlate this biological determinant with the degree of endothelial dysfunction assessed by flow-mediated brachial artery reactivity, and an atherosclerotic risk stratification method developed by the Framingham study. We hypothesize that a correlation will exist between the atherosclerotic risk profile, endothelial function and EPC activity and that the EPC activity will therefore become a novel surrogate biological marker for cumulative cardiovascular risk.
Study design
Who may qualify
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Child, Adult, Older adult
Key inclusion criteria (2 listed)
- Men: aged 21 and above with or without cardiovascular risk factors
- Women - post menopausal (based on clinical history) with and without cardiovascular risk factors
Key exclusion criteria (12 listed)
- Pre-menopausal women
- History of cancer
- Evidence of proliferative retinopathy
- History of migraine-type headache
- History of cluster headache
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Not reported in the source record.
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 4 Mar 2008.
- Background: PubMed 9657732Shi Q, Rafii S, Wu MH, Wijelath ES, Yu C, Ishida A, Fujita Y, Kothari S, Mohle R, Sauvage LR, Moore MA, Storb RF, Hammond WP. Evidence for circulating bone marrow-derived endothelial cells. Blood. 1998 Jul 15;92(2):362-7.
- Background: PubMed 9020076Asahara T, Murohara T, Sullivan A, Silver M, van der Zee R, Li T, Witzenbichler B, Schatteman G, Isner JM. Isolation of putative progenitor endothelial cells for angiogenesis. Science. 1997 Feb 14;275(5302):964-7. doi: 10.1126/science.275.5302.964.
- Background: PubMed 8479518Ross R. The pathogenesis of atherosclerosis: a perspective for the 1990s. Nature. 1993 Apr 29;362(6423):801-9. doi: 10.1038/362801a0.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Coronary Arteriosclerosis, run by National Heart, Lung, and Blood Institute (NHLBI) at 1 site in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 2 inclusion and 12 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 4 Mar 2008. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT00013975, which also lists 3 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 4 Mar 2008.