CCN2 (Cellular Communication Network Factor 2) Deletion Alters Vascular Integrity and Function Predisposing to...

Area of Science:

• Cardiovascular Biology
• Molecular Biology
• Pathology

Background:

• Cellular communication network factor 2 (CCN2) is a matricellular protein implicated in cell communication and signaling.
• CCN2 is frequently overexpressed in cardiovascular diseases, yet its precise function remains unclear.

Purpose of the Study:

• To investigate the role of CCN2 in maintaining aortic wall homeostasis and its response to vascular injury.
• To elucidate CCN2's involvement in angiotensin II (Ang II)-induced aortic pathology.

Main Methods:

• Utilized inducible <i>Ccn2</i>-deficient mice subjected to Ang II infusion to induce vascular damage.
• Assessed aortic integrity and aneurysm development using magnetic resonance imaging, echography, and histological examination.
• Performed RNA sequencing and gene ontology analysis to identify molecular pathways affected by CCN2 deficiency.

Main Results:

• CCN2 deficiency led to a 60% mortality rate in mice due to rapid aortic aneurysm development and rupture following Ang II infusion.
• <i>Ccn2</i> deletion resulted in decreased blood pressure, aortic structural/functional changes, and increased metalloproteinase activity, worsened by Ang II.
• Gene ontology analysis revealed aldosterone biosynthesis as a key pathway affected by CCN2 deficiency; spironolactone treatment mitigated aneurysm formation and mortality.

Conclusions:

• CCN2 is essential for maintaining aortic structural and functional integrity, particularly under stress induced by Ang II.
• CCN2's protective role involves, in part, the regulation of the aldosterone pathway.
• These findings offer new insights into vascular pathologies and potential therapeutic targets.