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Proteomic analysis of circulating human monocytes in coronary artery disease

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Abstract

Monocytes play an important role in inflammation and atherosclerosis; however, the molecular details underlying these diverse functions are not completely understood. Proteomic analysis of monocytes can provide new insights into their biological role in coronary artery disease (CAD). Twenty angiographically confirmed male, CAD patients (≥50% stenosis) attending cardiology clinic of Nehru Hospital, PGIMER, Chandigarh, and who were not receiving any lipid lowering therapy and 20 TMT negative subjects who served as controls were enrolled in the study. Circulating monocytes isolated from overnight fasting blood samples were analyzed by 2D gel electrophoresis (pH 4–7), and differentially expressed protein spots were subjected to mass spectrometry and identification of proteins. We observed 333 ± 40 protein spots in monocytes from patients and 312 ± 20 in controls; out of which 63 protein spots showed altered intensity in CAD patients. Thirteen spots showed fivefold increased and two protein spots showed fivefold decreased expression in CAD group as compared to control group, respectively. Two proteins showing decreased expression in monocytes from CAD patients were identified as: (i) glutathione transferase and (ii) heat shock protein 70 KDa. Proteins showing increased expression in CAD patients were identified as: (i) vimentin, (ii) mannose binding lectin receptor protein, and (iii) S100A8 calcium-binding protein. The results of our study offer identification of several proteins in monocytes which can provide new perspectives in role of monocytes in pathogenesis of atherosclerosis.

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Acknowledgment

This research project was funded by the Department of Biotechnology (DBT), New Delhi, India (DBT ref. no. BT/PR8001/MED/12/306/2006).

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The authors declare that they have no conflict of interests.

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Authors and Affiliations

  1. Department of Experimental Medicine and Biotechnology, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India

    Aruna Poduri & Madhu Khullar

  2. Department of Cardiology, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India

    Ajay Bahl & Kewal K. Talwar

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  1. Aruna Poduri
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  2. Ajay Bahl
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  4. Madhu Khullar
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Correspondence to Madhu Khullar.

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Poduri, A., Bahl, A., Talwar, K.K. et al. Proteomic analysis of circulating human monocytes in coronary artery disease. Mol Cell Biochem 360, 181–188 (2012). https://doi.org/10.1007/s11010-011-1055-3

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