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Isolation and Characterization of Primary Rat Valve Interstitial Cells: A New Model to Study Aortic Valve Calcification
Published on: November 20, 2017
PTEN Regulates Myofibroblast Activation in Valvular Interstitial Cells Based on Subcellular Localization
Dilara Batan1,2, Georgios Tseropoulos1,2, Bruce E Kirkpatrick1,2,3
1Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado, 80303, USA.
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.
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.
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