NEXN protects against vascular calcification by promoting SERCA2 SUMOylation and stabilization

Area of Science:

• Cardiovascular Biology
• Molecular Mechanisms of Disease
• Vascular Biology

Background:

• Vascular calcification is a major risk factor for cardiovascular diseases.
• It is driven by smooth muscle cell phenotypic transition.
• The role of Nuclear factor X (NEXN) in vascular calcification is not well understood.

Purpose of the Study:

• To investigate the cell-specific roles and molecular mechanisms of NEXN in vascular calcification.
• To determine how NEXN influences the phenotypic transition of vascular smooth muscle cells.

Main Methods:

• Multi-transcriptomics analysis in male mice.
• Generation of vascular smooth muscle cell-specific NEXN knockout and overexpression models.
• Assessment of vascular calcification progression.

Main Results:

• Vascular smooth muscle cell-specific NEXN knockout exacerbated calcification.
• NEXN overexpression alleviated vascular calcification.
• NEXN interacts with SERCA2, enhancing its SUMOylation, stability, and function.

Conclusions:

• NEXN plays a protective role against vascular calcification.
• NEXN-SERCA2 interaction is a key mechanism in preventing calcification.
• Targeting NEXN-SERCA2 interactions or SERCA2 SUMOylation may offer therapeutic strategies for vascular calcification.