Lipoprotein (a)-mediated vascular calcification: population-based and in vitro studies

Area of Science:

• Cardiovascular Biology
• Molecular Medicine
• Vascular Biology

Background:

• Lipoprotein (a) [Lp(a)] is a known causal risk factor for cardiovascular diseases.
• The specific role of Lp(a) in vascular calcification remains incompletely understood.
• This study investigates the association between Lp(a) and vascular calcification.

Purpose of the Study:

• To determine the correlation between Lp(a) levels and coronary artery calcification (CAC) severity in a patient cohort.
• To elucidate the in vitro mechanisms by which Lp(a) contributes to vascular calcification.
• To identify potential molecular pathways targeted by Lp(a) in vascular calcification.

Main Methods:

• Population-based study of 2806 patients undergoing coronary computed tomography to assess Lp(a) and CAC.
• In vitro experiments using human aortic smooth muscle cells (HASMCs) to study Lp(a)-induced calcification.
• Investigation of signaling pathways including Notch1, BMP2-Smad1/5/9, and NF-κB.

Main Results:

• Lp(a) showed an independent correlation with the presence and severity of CAC.
• Lp(a) stimulation increased calcific deposition and alkaline phosphatase activity in HASMCs.
• Lp(a) activated Notch1 signaling, up-regulating BMP2 and NF-κB pathways, leading to vascular calcification.

Conclusions:

• Elevated Lp(a) is independently associated with CAC presence and severity.
• Lp(a) promotes vascular calcification through Notch1-NF-κB and Notch1-BMP2-Smad1/5/9 signaling pathways.
• Lp(a) represents a potential novel therapeutic target for managing vascular calcification.