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Activating PRKG1 Variant Enhances Smooth Muscle Cell Deformability to Cause Aortopathy.

Marie E Jost1, Moyra Schweizer1, Philipp Henning2

  • 1Department of Experimental Pharmacology and Toxicology, Cardiovascular Research Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; DZHK (German Center for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.

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PubMed
Summary
This summary is machine-generated.

Rare genetic variants in PRKG1 can cause aortic dissection by increasing tissue elasticity. The V219I variant in vascular smooth muscle cells leads to larger, more deformable cells and weakened structural integrity, explaining predisposition to this condition.

Keywords:
actin cytoskeletoncGMP-bindingcGMP-dependent protein kinasedeformabilityinherited aortopathykinase activityvariants of unknown significance

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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.