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Updated: May 13, 2026

Isolation of Human Primary Valve Cells for In vitro Disease Modeling
07:31

Isolation of Human Primary Valve Cells for In vitro Disease Modeling

Published on: April 16, 2021

Noggin attenuates the osteogenic activation of human valve interstitial cells in aortic valve sclerosis

Paolo Poggio1, Rachana Sainger, Emanuela Branchetti

  • 1Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.

Cardiovascular Research
|March 14, 2013
PubMed

Insights

Aortic valve sclerosis (AVSc) can be induced to show osteogenic markers. Combining BMP4 and mechanical stimulation drives valve interstitial cells (VICs) toward a calcified phenotype.

Area of Science:

  • Cardiovascular Biology
  • Biomaterials Science
  • Cellular Biology

Background:

  • Aortic valve sclerosis (AVSc) is a precursor to calcific aortic valve stenosis (AVS), affecting 25-30% of individuals over 65.
  • AVSc involves leaflet thickening but is often asymptomatic due to minimal impact on valve mechanics.
  • The pathogenesis of AVSc remains understudied, particularly using human tissue samples.

Purpose of the Study:

  • To investigate the role of BMP4 in the osteogenic transdifferentiation of human valve interstitial cells (VICs) in AVSc.
  • To explore the combined effects of BMP4 and mechanical stimulation on VICs derived from AVSc specimens.
  • To elucidate the mechanisms underlying the progression from AVSc to more advanced stages of aortic stenosis.

Main Methods:

  • Human aortic valve specimens from 60 patients (AVS, AVSc, and controls) were analyzed.
  • In vitro and ex vivo experiments utilized cell culture and a Tissue Engineering (TE) Aortic Valve model.
  • BMP4 and its antagonist Noggin were used to modulate VIC activation and biomineralization, alongside mechanical stimulation.

Main Results:

  • Non-calcified AVSc leaflets, when treated with BMP4 and mechanical stimulation, expressed osteogenic and biomineralization markers.
  • BMP4 alone did not induce osteogenic transdifferentiation; however, combined with mechanical stretch, it activated VICs towards a late calcified phenotype.
  • The BMP4 antagonist Noggin effectively reduced VIC activation and biomineralization, highlighting BMP4's crucial role.

Conclusions:

  • This study provides the first evidence using AVSc specimens that human sclerotic aortic valves can be induced to exhibit an osteogenic phenotype.
  • The findings suggest that BMP4 signaling, in conjunction with mechanical forces, plays a significant role in the progression of AVSc towards severe aortic stenosis.
  • These insights could inform future therapeutic strategies targeting AVSc and AVS.
Abstract

Keywords:
Aortic valve sclerosisBone morphogenetic protein 4Calcific aortic stenosisValve interstitial cells

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