Discovery of New Circulating Biomarkers of Coronary Atherosclerosis

Status Completed

Clinical Trial Summary

The study hypothesis is that differential proteomic techniques can be used to discover new circulating biomarkers of coronary atherosclerosis in the blood of patients suffering from coronary artery disease (either stable or unstable) who will be compared to a group of patients without coronary artery disease

Clinical Trial Description

Hypothesis: Our hypothesis is that coronary atherosclerosis induces both quantitative and qualitative modifications of circulating proteins, which can be captured by a differential proteomic approach applied to serum or plasma samples. Identification of such modifications in the circulating blood of patients with coronary artery disease (versus patients without coronary artery disease) and/or of patients with acute coronary syndromes (versus stable coronary artery disease) may lead to discovery of new biomarkers of coronary atherosclerosis and of atherosclerotic plaque vulnerability.

Objectives:

Primary objective: Identification of new circulating biomarkers of stable and unstable coronary artery disease using a new approach of differential proteomics.

Secondary objectives:

- Evaluation of the diagnostic value of these new biomarkers for the diagnosis of stable and unstable coronary artery disease.

- Comparison of the diagnostic value of these new biomarkers to the diagnostic value of 1) other validated biomarkers of atherosclerosis (eg, CRP, IL-6, CD40L, markers of leukocyte activation, …); and 2) of non-invasive measures of arterial function (eg, carotid artery intima-media thickness, pulse wave velocity, ankle/brachial index, …)

- Description of the relationship between these new biomarkers and major adverse coronary events (death, myocardial infarction, revascularization) during a 12-month follow-up.

Methods:

Uniq center, prospective study. Three groups of patients will be studied. Group 1: Non-ST-elevation acute myocardial infarction; Group 2: Stable coronary artery disease; Group 3: normal coronary arteries and absence of other detectable atherosclerotic lesions.

A new proteomic approach will be applied to serum and plasma samples obtained 1 month after the index hospitalisation. This approach includes 3 steps: 1) equalisation of circulating proteins (expose low-concentration proteins belonging to the "deep-proteome"); 2) Retention chromatography; and 3) protein separation using 2D-electrophoresis and Surface-Enhanced Laser Desorption/Ionisation Time-of-Flight (SELDI-TOF).

Biomarkers with the highest diagnostic value will be subsequently identified using Matrix-Assisted Laser Desorbtion/Ionisation Time-of-Flight (MALDI-TOF) and tandem mass spectrometry (MS/MS).

Perspectives:

Validation of the diagnostic and prognostic values of the new biomarkers discovered and identified using the proteomic approach described above will require development of more straightforward measurement techniques (eg, ELISA), which will be used prospectively or retrospectively in other cohorts of patients with coronary artery disease. Basic studies will be performed in parallel, so as to better understand the role of these new biomarkers in the pathophysiology of atherosclerosis. ;

Study Design

Time Perspective: Prospective

Related Conditions & MeSH terms

Clinical Trial Details

NCT number	NCT00430820
Study type	Observational
Source	Assistance Publique - Hôpitaux de Paris
Contact
Status	Completed
Phase	N/A
Start date	March 2007
Completion date	November 2009

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