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Related Experiment Video

Updated: May 13, 2025

Isolation of Primary Patient-specific Aortic Smooth Muscle Cells and Semiquantitative Real-time Contraction Measurements In Vitro

Isolation of Primary Patient-specific Aortic Smooth Muscle Cells and Semiquantitative Real-time Contraction Measurements In Vitro

Published on: February 15, 2022

PTEN Regulates Myofibroblast Activation in Valvular Interstitial Cells Based on Subcellular Localization.

Dilara Batan^1,2, Georgios Tseropoulos^1,2, Bruce E Kirkpatrick^1,2,3

¹Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado, 80303, USA.

Advanced Biology

|April 15, 2025

Summary

The tumor suppressor PTEN (phosphatase and tensin homolog) protects against aortic valve stenosis (AVS) by preventing valvular interstitial cell activation. PTEN promotes a quiescent fibroblast phenotype, offering a potential therapeutic target for AVS.

Keywords:

fibrosis heart valve hydrogels interstitial cells

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Last Updated: May 13, 2025

Isolation of Primary Patient-specific Aortic Smooth Muscle Cells and Semiquantitative Real-time Contraction Measurements In Vitro

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Published on: February 15, 2022

Isolation of Human Primary Valve Cells for In vitro Disease Modeling

Isolation of Human Primary Valve Cells for In vitro Disease Modeling

Published on: April 16, 2021

Isolation and Characterization of Primary Rat Valve Interstitial Cells: A New Model to Study Aortic Valve Calcification

Isolation and Characterization of Primary Rat Valve Interstitial Cells: A New Model to Study Aortic Valve Calcification

Published on: November 20, 2017

Area of Science:

Cardiovascular Biology
Cellular Biology
Fibrosis Research

Background:

Aortic valve stenosis (AVS) involves disrupted mechanics and left ventricle hypotrophy due to altered valve leaflet function.
Valvular interstitial cells (VICs) activate into myofibroblasts, a key feature of AVS, characterized by increased αSMA.
The tumor suppressor PTEN (phosphatase and tensin homolog) is implicated in regulating fibrosis in various tissues.

Purpose of the Study:

To investigate the role of PTEN as a protective factor against matrix-induced myofibroblast activation in VICs.
To determine PTEN's function in regulating VIC phenotype and its potential as a therapeutic target for AVS.

Main Methods:

Analysis of PTEN levels in human aortic valve tissue (healthy vs. diseased).
Treatment of VIC cultures with pharmacological inducers and manipulation of PTEN levels (overexpression/inhibition).
Assessment of myofibroblast activation, nuclear PTEN localization, and fibroblast phenotype on stiff matrices.

Main Results:

Human aortic valve disease tissue shows lower PTEN levels compared to healthy tissue.
PTEN overexpression inhibited stiffness-induced myofibroblast activation in VICs.
PTEN inhibition exacerbated myofibroblast activation; increased nuclear PTEN correlated with quiescence.

Conclusions:

PTEN suppresses VIC activation and promotes a quiescent fibroblast phenotype.
PTEN functions as a protective factor in the context of AVS.
PTEN represents a potential pharmacological target for treating aortic valve stenosis.