Multiplexed LC–ESI–MRM-MS-based Assay for Identification of Coronary Artery Disease Biomarkers in Human Plasma

Mohammad A. Anwar, Darlene Liying Dai, Janet Wilson-McManus, Derek Smith, Gordon A. Francis, Christoph H. Borchers, Bruce M. McManus, John S. Hill, Gabriela V. Cohen Freue

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Purpose: A highly-multiplexed LC–ESI–multiple reaction monitoring-MS-based assay is developed for the identification of coronary artery disease (CAD) biomarkers in human plasma. Experimental design: The assay is used to measure 107 stable isotope labeled peptide standards and native peptides from 64 putative biomarkers of cardiovascular diseases in tryptic digests of plasma from subjects with (n = 70) and without (n = 45) angiographic evidence of CAD and no subsequent cardiovascular mortality during follow-up. Results: Extensive computational and statistical analysis reveals six plasma proteins associated with CAD, namely apolipoprotein CII, C reactive protein, CD5 antigen-like, fibronectin, inter alpha trypsin inhibitor heavy chain H1, and protein S. The identified proteins are combined into a LASSO-logistic score with high classification performance (cross-validated area under the curve = 0.74). When combined with a separate score computed from markers currently used in the clinic with similar performance, the area under the receiver operating curve increases to 0.84. Similar results are observed in an independent set of subjects (n = 87). Conclusions and clinical relevance: If externally validated, the assay and identified biomarkers can improve CAD risk stratification.

Original languageEnglish
Article number1700111
JournalProteomics - Clinical Applications
Volume13
Issue number4
DOIs
Publication statusPublished - Jul 2019
Externally publishedYes

Keywords

  • biomarkers
  • classification
  • coronary artery disease
  • MRM-MS
  • proteomics

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