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J Am Coll Cardiol. 2013 Oct 1;62(14):1267-1276. doi: 10.1016/j.jacc.2013.05.073. Epub 2013 Jul 3.

Aspirin exposure reveals novel genes associated with platelet function and cardiovascular events.

Author information

1
Institute for Genome Sciences & Policy, Duke University, Durham, North Carolina; Department of Medicine, Duke University, Durham, North Carolina. Electronic address: deepak.voora@duke.edu.
2
Institute for Genome Sciences & Policy, Duke University, Durham, North Carolina.
3
Department of Medicine, Duke University, Durham, North Carolina.
4
Division of Genomic Medicine, The George Washington University/Medical Faculty Associates, Washington, DC.
5
Division of Cardiology, Department of Medicine, The George Washington University/Medical Faculty Associates, Washington, DC.
6
Institute for Genome Sciences & Policy, Duke University, Durham, North Carolina; Department of Medicine, Duke University, Durham, North Carolina. Electronic address: geoffrey.ginsburg@duke.edu.

Abstract

OBJECTIVES:

The aim of this study was to develop ribonucleic acid (RNA) profiles that could serve as novel biomarkers for the response to aspirin.

BACKGROUND:

Aspirin reduces death and myocardial infarction (MI), suggesting that aspirin interacts with biological pathways that may underlie these events.

METHODS:

Aspirin was administered, followed by whole-blood RNA microarray profiling, in a discovery cohort of healthy volunteers (HV1) (n = 50) and 2 validation cohorts of healthy volunteers (HV2) (n = 53) and outpatient cardiology patients (OPC) (n = 25). Platelet function was assessed using the platelet function score (PFS) in HV1 and HV2 and the VerifyNow Aspirin Test (Accumetrics, Inc., San Diego, California) in OPC. Bayesian sparse factor analysis identified sets of coexpressed transcripts, which were examined for associations with PFS in HV1 and validated in HV2 and OPC. Proteomic analysis confirmed the association of validated transcripts in platelet proteins. Validated gene sets were tested for association with death or MI in 2 patient cohorts (n = 587 total) from RNA samples collected at cardiac catheterization.

RESULTS:

A set of 60 coexpressed genes named the "aspirin response signature" (ARS) was associated with PFS in HV1 (r = -0.31, p = 0.03), HV2 (r = -0.34, Bonferroni p = 0.03), and OPC (p = 0.046). Corresponding proteins for the 17 ARS genes were identified in the platelet proteome, of which 6 were associated with PFS. The ARS was associated with death or MI in both patient cohorts (odds ratio: 1.2 [p = 0.01]; hazard ratio: 1.5 [p = 0.001]), independent of cardiovascular risk factors. Compared with traditional risk factors, reclassification (net reclassification index = 31% to 37%, p ≤ 0.0002) was improved by including the ARS or 1 of its genes, ITGA2B.

CONCLUSIONS:

RNA profiles of platelet-specific genes are novel biomarkers for identifying patients who do not respond adequately to aspirin and who are at risk for death or MI.

KEYWORDS:

ARS; CAD; CATHGEN; CI; Catheterization Genetics; DUMC; Duke University Medical Center; HV1; HV2; MI; MPV; OPC; OR; PCR; PFS; RNA; RT-PCR; aspirin; aspirin response signature; biomarkers; confidence interval; coronary artery disease; genes; healthy volunteer discovery cohort; healthy volunteer validation cohort; mean platelet volume; myocardial infarction; odds ratio; outpatient cardiology cohort; platelet function score; platelets; polymerase chain reaction; real-time polymerase chain reaction; ribonucleic acid

Comment in

PMID:
23831034
PMCID:
PMC3786046
DOI:
10.1016/j.jacc.2013.05.073
[Indexed for MEDLINE]
Free PMC Article

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