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Molecular & Cellular Proteomics 3:1200-1210, 2004.
© 2004 by The American Society for Biochemistry and Molecular Biology, Inc.

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Research

In Vitro Biomarker Discovery for Atherosclerosis by Proteomics^*

Estelle M. Fach, Leah-Ann Garulacan, Ji Gao, Qing Xiao, Stephen M. Storm, Yves P. Dubaquie, Stanley A. Hefta and Gregory J. Opiteck

From the Department of Clinical Discovery, Pharmaceutical Research Institute, Bristol-Myers Squibb Company, Princeton, NJ 08543

The purpose of this study was to identify in vitro and then prioritize a tractable set of protein biomarker candidates of atherosclerosis that may eventually be developed to measure the extent, progression, regression, and stability of atherosclerotic lesions. A study was conducted using an in vitro"foam cell" model based on the stimulation of differentiated THP1 cells with oxidized low-density lipoprotein (oxidized LDL) as compared with low-density lipoprotein (LDL). Analysis of the proteins contained in the cell supernatant using proteome scanning technology identified 59 proteins as being increased, 57 with no statistically measurable difference, and 17 decreasing in abundance following treatment with oxidized LDL, as compared with LDL. From the up-regulated list, proteins were prioritized based on their analytical confidence as well as their relevance to atherosclerosis pathways. Within the group of increased abundance, seven families of proteins were of particular interest: fatty acid-binding proteins, chitinase-like enzymes, cyclophilins, cathepsins, proteoglycans, urokinase-type plasminogen activator receptor, and a macrophage scavenger receptor.

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