Direct proinflammatory effect of C-reactive protein on human endothelial cells

Area of Science:

• Cardiovascular Biology
• Immunology
• Cellular Biology

Background:

• C-reactive protein (CRP) is a key acute-phase reactant and a significant risk factor for coronary heart disease.
• The specific impact of CRP on vascular cell function, particularly endothelial cells, remains largely uncharacterized.

Purpose of the Study:

• To investigate the effects of CRP on the expression of adhesion molecules in human endothelial cells.
• To determine if CRP contributes to the inflammatory processes implicated in atherosclerosis.

Main Methods:

• Human umbilical vein and coronary artery endothelial cells were incubated with recombinant human CRP.
• Expression of vascular cell adhesion molecule (VCAM-1), intercellular adhesion molecule (ICAM-1), and E-selectin was quantified using flow cytometry.
• Experiments were conducted with and without human serum to assess CRP's dependency on serum factors.

Main Results:

• CRP (10 microg/mL) significantly upregulated ICAM-1, VCAM-1, and E-selectin expression in endothelial cells, with effects comparable to interleukin-1beta.
• CRP-induced adhesion molecule expression was dependent on the presence of human serum in the culture medium.
• Dose-dependent effects were observed in coronary artery endothelial cells, with maximal induction at 50 microg/mL CRP.

Conclusions:

• CRP directly induces the expression of adhesion molecules in human endothelial cells, contingent upon the presence of serum.
• These findings support the hypothesis that CRP contributes to the inflammatory component of atherosclerosis.
• Targeting CRP may offer a novel therapeutic strategy for treating atherosclerosis.