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Measurement of Pulse Propagation Velocity, Distensibility and Strain in an Abdominal Aortic Aneurysm Mouse Model
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Downregulation of transforming growth factor, beta receptor 2 and Notch signaling pathway in human abdominal aortic

Erik Biros1, Philip J Walker, Maria Nataatmadja

  • 1Vascular Biology Unit, School of Medicine, James Cook University, Townsville, Queensland 4811, Australia.

Atherosclerosis
|February 8, 2012
PubMed
Abstract

Insights

Genetic changes in FBN1 and TGFBR2 genes, linked to Marfan syndrome, were found in abdominal aortic aneurysm (AAA) patients. These alterations, particularly TGFBR2 deletions, correlate with reduced gene expression and may contribute to AAA development.

Area of Science:

  • Vascular Biology
  • Genetics
  • Molecular Pathology

Background:

  • Marfan syndrome (MFS) is associated with FBN1 and TGFBR2 gene mutations, leading to vascular complications like aneurysms.
  • Abdominal aortic aneurysm (AAA) is an acquired vascular disease with an unknown etiology.
  • Investigating MFS-related genes in AAA may reveal insights into AAA pathogenesis.

Purpose of the Study:

  • To determine the presence of genetic aberrations in FBN1 and TGFBR2 in patients with AAA.
  • To explore the relationship between these genetic changes and gene expression in AAA tissue.

Main Methods:

  • Copy number variation (CNV) analysis of FBN1 and TGFBR2 genes in AAA biopsies.
  • Gene expression analysis of FBN1, TGFBR2, NOTCH3, HEY2, and TAGLN in AAA and control biopsies.
  • Comparison of gene expression levels between AAA patients and organ donor controls.

Main Results:

  • Deletions in FBN1 exon 66 and TGFBR2 exon 8 were identified in a majority of AAA patients.
  • TGFBR2 deletion was associated with significant downregulation of TGFBR2 expression in AAA.
  • Notch signaling pathway components (NOTCH3, HEY2) were downregulated in AAA, while TAGLN expression remained unchanged.

Conclusions:

  • Acquired alterations in FBN1 and TGFBR2 genes may play a role in AAA pathogenesis.
  • Downregulation of TGF-β and Notch signaling pathways could contribute to AAA development.
  • Further research is needed to elucidate the precise mechanisms involved in AAA formation.

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