Activating PRKG1 Variant Enhances Smooth Muscle Cell Deformability to Cause Aortopathy

Area of Science:

• Cardiovascular Biology
• Genetics
• Molecular Medicine

Background:

• Aortic dissection is often linked to aging and hypertension.
• Rare genetic variants are emerging as critical factors in aortic disease.
• The PRKG1 gene plays a role in vascular smooth muscle cell function.

Purpose of the Study:

• To investigate the role of the PRKG1 V219I genetic variant in aortic dissection.
• To elucidate the molecular mechanisms by which PRKG1 variants predispose individuals to aortic aneurysms and dissections.
• To understand the cellular and structural changes induced by the PRKG1 V219I variant.

Main Methods:

• Analysis of patients with aortic aneurysms and the PRKG1 V219I variant.
• In vitro studies using vascular smooth muscle cells expressing the V219I variant.
• Assessment of cell size, deformability, actin cytoskeleton dynamics, and extracellular matrix signaling.

Main Results:

• Vascular smooth muscle cells with the V219I variant were larger and more deformable.
• Aberrant actin cytoskeleton dynamics and altered extracellular matrix signaling were observed.
• These changes resulted in weakened structural integrity and increased tissue elasticity.

Conclusions:

• The PRKG1 V219I variant causes significant alterations in vascular smooth muscle cell properties.
• Increased tissue elasticity due to PRKG1 variants is a key pathomechanism for aortic dissection.
• This study provides a mechanistic model for PRKG1-associated aortic disease.