CD11c/CD18 Expression is upregulated on blood monocytes during hypertriglyceridemia and enhances adhesion to vascular cell adhesion molecule-1

R. Michael Gower, Huaizhu Wu, Greg A. Foster, Sridevi Devaraj, Ishwarlal Jialal, Christie M. Ballantyne, Anne A Knowlton, Scott I. Simon

Research output: Contribution to journalArticle

95 Citations (Scopus)

Abstract

Objective- Atherosclerosis is associated with monocyte adhesion to the arterial wall that involves integrin activation and emigration across inflamed endothelium. Involvement of β2-integrin CD11c/CD18 in atherogenesis was recently shown in dyslipidemic mice, which motivates our study of its inflammatory function during hypertriglyceridemia in humans. Methods and results- Flow cytometry of blood from healthy subjects fed a standardized high-fat meal revealed that at 3.5 hours postprandial, monocyte CD11c surface expression was elevated, and the extent of upregulation correlated with blood triglycerides. Monocytes from postprandial blood exhibited an increased light scatter profile, which correlated with elevated CD11c expression and uptake of lipid particles. Purified monocytes internalized triglyceride-rich lipoproteins isolated from postprandial blood through low-density lipoprotein-receptor- related protein-1, and this also elicited CD11c upregulation. Laboratory-on-a-chip analysis of whole blood showed that monocyte arrest on a vascular cell adhesion molecule-1 (VCAM-1) substrate under shear flow was elevated at 3.5 hours and correlated with blood triglyceride and CD11c expression. At 7 hours postprandial, blood triglycerides decreased and monocyte CD11c expression and arrest on VCAM-1 returned to fasting levels. Conclusion- During hypertriglyceridemia, monocytes internalize lipids, upregulate CD11c, and increase adhesion to VCAM-1. These data suggest that analysis of monocyte inflammation may provide an additional framework for evaluating individual susceptibility to cardiovascular disease.

Original languageEnglish (US)
Pages (from-to)160-166
Number of pages7
JournalArteriosclerosis, Thrombosis, and Vascular Biology
Volume31
Issue number1
DOIs
StatePublished - Jan 2011

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Vascular Cell Adhesion Molecule-1
Hypertriglyceridemia
Monocytes
Triglycerides
Up-Regulation
Integrins
Atherosclerosis
Low Density Lipoprotein Receptor-Related Protein-1
Lipids
Emigration and Immigration
Lipoproteins
Endothelium
Meals
Fasting
Healthy Volunteers
Flow Cytometry
Cardiovascular Diseases
Fats
Inflammation
Light

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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CD11c/CD18 Expression is upregulated on blood monocytes during hypertriglyceridemia and enhances adhesion to vascular cell adhesion molecule-1. / Gower, R. Michael; Wu, Huaizhu; Foster, Greg A.; Devaraj, Sridevi; Jialal, Ishwarlal; Ballantyne, Christie M.; Knowlton, Anne A; Simon, Scott I.

In: Arteriosclerosis, Thrombosis, and Vascular Biology, Vol. 31, No. 1, 01.2011, p. 160-166.

Research output: Contribution to journalArticle

Gower, R. Michael ; Wu, Huaizhu ; Foster, Greg A. ; Devaraj, Sridevi ; Jialal, Ishwarlal ; Ballantyne, Christie M. ; Knowlton, Anne A ; Simon, Scott I. / CD11c/CD18 Expression is upregulated on blood monocytes during hypertriglyceridemia and enhances adhesion to vascular cell adhesion molecule-1. In: Arteriosclerosis, Thrombosis, and Vascular Biology. 2011 ; Vol. 31, No. 1. pp. 160-166.
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