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Related Experiment Video

Updated: Nov 12, 2025

Isolation of Mouse Interstitial Valve Cells to Study the Calcification of the Aortic Valve In Vitro
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New calcification model for intact murine aortic valves.

Boudewijn P T Kruithof1, Vera van de Pol2, Tamara Los2

  • 1Department of Cardiology, Leiden University Medical Center, Leiden, The Netherlands; Department of Cell and Chemical Biology, Leiden University Medical Center, Leiden, The Netherlands; Netherlands Heart Institute, Utrecht, The Netherlands.

Journal of Molecular and Cellular Cardiology
|March 21, 2021
PubMed
Summary

Researchers developed a novel ex vivo model to study calcific aortic valve disease (CAVD) in intact mouse aortic valves. This system allows for the investigation of calcification mechanisms, aiding the development of new pharmacological treatments for CAVD.

Keywords:
Calcific aortic valve diseaseCalcificationDexamethasoneEx vivo flow modelOsteogenic mediumPhosphate bufferValvular interstitial cells

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Area of Science:

  • Cardiovascular Biology
  • Translational Medicine
  • Biomaterials Science

Background:

  • Calcific aortic valve disease (CAVD) is a prevalent condition with no current medical treatments, necessitating surgical intervention.
  • Developing effective pharmacological treatments for CAVD is hindered by the absence of suitable experimental systems that preserve valve structure and function.
  • Existing in vitro models often fail to replicate the complex mechanical and biochemical environment of the native aortic valve.

Purpose of the Study:

  • To establish a novel ex vivo model for studying calcification in intact mouse aortic valves.
  • To investigate the mechanisms of aortic valve calcification using a Miniature Tissue Culture System (MTCS).
  • To compare in vitro and ex vivo cellular responses to osteogenic stimuli in the context of aortic valve disease.

Main Methods:

  • Utilized the Miniature Tissue Culture System (MTCS), an ex vivo flow model for whole mouse hearts.
  • Cultured aortic valves from wild-type mice ex vivo and exposed them to osteogenic medium (OSM) or inorganic phosphates (PI).
  • Analyzed calcification, osteogenic marker expression, and endochondral differentiation in aortic valve leaflets and roots.

Main Results:

  • Osteogenic calcification was observed in aortic valve leaflets cultured ex vivo with inorganic phosphates (PI), but not with OSM.
  • In vitro cultured valvular interstitial cells calcified under both OSM and PI conditions, highlighting in vitro-ex vivo differences.
  • Endochondral differentiation occurred in the aortic root near the valve hinge under both PI and OSM, with dexamethasone inducing this process but inhibiting leaflet calcification.

Conclusions:

  • An ex vivo model for intact murine aortic valve calcification was successfully established, enabling the study of CAVD initiation and progression.
  • The model demonstrated in vitro-ex vivo differences, emphasizing the importance of ex vivo systems for pre-clinical translational research in CAVD.
  • Findings suggest that dexamethasone's effect on endochondral differentiation and leaflet calcification may partly explain the absence of OSM-induced calcification in the ex vivo valve model.