Osteogenic regulation of vascular calcification

Area of Science:

• Biomedical research
• Cardiovascular science
• Molecular biology

Background:

• Vascular calcification is a growing concern in aging and dysmetabolic populations, contributing to cardiovascular mortality.
• Osteogenic processes, including BMP2-Msx2 signaling, are implicated in vascular calcification.
• Existing animal models do not fully recapitulate the molecular mechanisms of Msx2 in vascular calcification.

Purpose of the Study:

• To investigate the role of Msx2 in diet-induced vascular calcification.
• To determine if Msx2 signaling promotes vascular calcification through Wnt pathway activation.
• To explore Msx2 as a potential therapeutic target for diabetic vascular disease.

Main Methods:

• Developed a diet-induced animal model of diabetes, dyslipidemia, and vascular calcification using LDLR-deficient mice.
• Utilized CMV-Msx2Tg+;LDLR+ transgenic mice to study Msx2 overexpression in vascular calcification.
• Analyzed vascular calcium accumulation via alizarin red staining and gene expression of osteogenic markers (ALP) and signaling pathways (Wnt, Dkk1).

Main Results:

• High-fat diets induced vascular calcification in male LDLR-deficient mice, with increased aortic BMP2 and Msx2 expression.
• CMV-Msx2Tg+ mice on high-fat diets exhibited significant vascular calcium accumulation, particularly in coronary arteries and aorta.
• Msx2 upregulated aortic Wnt ligand expression while downregulating Dkk1, indicating enhanced Wnt signaling, and promoted pro-osteogenic milieu.

Conclusions:

• Aortic Msx2 signaling plays a pro-osteogenic role in vascular calcification, partly through enhancing paracrine Wnt signaling.
• Msx2 contributes to the initiation and progression of diabetic vascular disease.
• Targeting Msx2-Wnt cascades presents a potential therapeutic strategy for mitigating diabetic vascular complications.