Journal
JOURNAL OF PROTEOME RESEARCH
Volume 5, Issue 11, Pages 2928-2934Publisher
AMER CHEMICAL SOC
DOI: 10.1021/pr060062+
Keywords
mass spectrometry; immunoassay; myocardial infarction; multiplexing; human plasma
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Funding
- NCI NIH HHS [5 R44 CA99117-03] Funding Source: Medline
- NHLBI NIH HHS [5 R44 HL072671-03] Funding Source: Medline
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Reported here is the development of a multiplexed mass spectrometric immunoassay (MSIA) for the detection of myocardial infarction (MI). The assay is the product of a study that systematically progresses from biomarker discovery-to identification and verification-to assay design, data analysis, and statistical challenge. During targeted population proteomics investigations, two novel biomarkers, serum amyloid A1 alpha and S-sulfated transthyretin, were found to be responsive to MI. These putative markers were subsequently screened in larger cohorts of individuals to verify their responsiveness toward MI. Upon verification, a multiplexed assay was designed that was capable of simultaneously monitoring the new markers plus a previously established MI-marker ( myoglobin). The multiplexed MSIA was applied to two 96-sample sets comprised of 48-MI/48-healthy and 19-MI/77-healthy, which served as training and case cohorts, respectively. Data evaluation using either preset reference levels or multivariate analysis exhibited sensitivities and specificities of > 97%. These findings illustrate the importance of using systematic approaches in clinical proteomics to discover biomarkers and produce high-performance assays relevant to disease.
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