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Assembly and Characterization of Polyelectrolyte Complex Micelles
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Integrin α5β1 regulates PP2A complex assembly through PDE4D in atherosclerosis
Sanguk Yun1, Rui Hu1, Melanie E Schwaemmle1
1Department of Internal Medicine, Yale Cardiovascular Research Center, and.
The Journal of Clinical Investigation
|August 14, 2019
Summary
Fibronectin activates endothelial cells via phosphodiesterase 4D5 (PDE4D5) in vascular remodeling and atherosclerosis. Inhibiting this interaction reduced inflammation and plaque size in mice, revealing a new therapeutic target.
Area of Science:
- Vascular Biology
- Cell Signaling
- Atherosclerosis Research
Background:
- Fibronectin in vascular walls drives endothelial inflammation and atherosclerosis.
- This process involves integrin α5 binding to phosphodiesterase 4D5 (PDE4D5), leading to its activation and hydrolysis of anti-inflammatory cAMP.
- Activated PDE4D5 promotes inflammatory signaling, contributing to vascular remodeling and disease progression.
Purpose of the Study:
- To investigate the in vivo role of PDE4D5 in fibronectin-mediated endothelial activation and atherosclerosis.
- To elucidate the mechanism of PDE4D5 activation by integrin signaling.
- To identify novel therapeutic strategies targeting the fibronectin-integrin-PDE4D5 axis.
Main Methods:
- In vivo studies using genetically modified mice with a mutated integrin binding site in PDE4D5.
- Assessment of endothelial inflammatory activation in athero-prone arterial regions.
- Analysis of atherosclerotic plaque size and stability markers in a hyperlipidemia model.
- Proteomic analysis to identify PDE4D5-interacting proteins and regulatory complexes.
Main Results:
- Mutation of the integrin binding site in PDE4D5 significantly reduced endothelial inflammatory activation.
- In a hyperlipidemia model, this mutation decreased atherosclerotic plaque size and increased plaque stability markers.
- Proteomics identified the PP2A regulatory subunit B55α as a key component in recruiting PP2A to PDE4D5, facilitating its dephosphorylation and activation.
- The PDE4D5-PP2A-B55α complex also dephosphorylated and activated the transcription factor Yap.
Conclusions:
- PDE4D5 acts as a crucial mediator of matrix-specific endothelial cell (EC) phenotype regulation through an unconventional adapter role.
- The fibronectin-integrin-PDE4D5-PP2A-B55α pathway represents a novel mechanism controlling EC inflammatory responses and atherosclerotic development.
- Targeting this pathway holds potential for therapeutic interventions in vascular diseases like atherosclerosis.
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