A novel role of CCN3 in regulating endothelial inflammation

Area of Science:

• Cardiovascular Biology
• Endothelial Cell Function
• Molecular Mechanisms of Inflammation

Background:

• The vascular endothelium is crucial for cardiovascular health, but mechanisms of endothelial homeostasis are not fully understood.
• CCN3, a CCN family protein, has known roles in various cell types, but its function in endothelial cells is unexplored.
• Understanding CCN3's role could reveal new therapeutic targets for cardiovascular diseases.

Purpose of the Study:

• To investigate the function of CCN3 in endothelial cells.
• To elucidate the regulatory mechanisms of CCN3 expression and its impact on endothelial inflammatory responses.
• To determine CCN3's role in cardiovascular disease pathogenesis.

Main Methods:

• Immunohistochemical analysis of CCN3 expression in mouse tissues.
• Investigated CCN3 transcriptional regulation by laminar shear stress (LSS) and statins in human umbilical vein endothelial cells (HUVECs).
• Utilized promoter analysis, adenoviral overexpression, knockdown studies, and NF-κB activity assays.

Main Results:

• CCN3 is robustly expressed in the endothelium of various blood vessels.
• Laminar shear stress and statins induce CCN3 expression via Kruppel-like factor 2 (KLF2), while proinflammatory cytokines suppress it.
• CCN3 overexpression inhibits cytokine-induced vascular adhesion molecule-1 (VCAM-1) and monocyte adhesion, whereas CCN3 knockdown enhances these effects.
• CCN3 negatively regulates NF-κB activity by reducing its nuclear translocation and binding to the VCAM-1 promoter.

Conclusions:

• CCN3 is a novel regulator of endothelial cells.
• CCN3 exhibits anti-inflammatory properties by inhibiting NF-κB-mediated VCAM-1 expression and monocyte adhesion.
• CCN3 represents a potential therapeutic target for modulating endothelial inflammation in cardiovascular disease.