Piezo1 in PASMCs: Critical for Hypoxia-Induced Pulmonary Hypertension Development

Area of Science:

• Cardiovascular Research
• Pulmonary Medicine
• Cellular Mechanobiology

Background:

• Pulmonary hypertension (PH) is a progressive, incurable disease characterized by pulmonary arterial smooth muscle cell (PASMC) contraction and proliferation.
• Altered mechanical stress in pulmonary arteries is a key stimulus for PASMC dysfunction during PH.
• Mechanosensitive ion channels, like Piezo1, translate mechanical stimuli into cellular responses relevant to PH pathogenesis.

Purpose of the Study:

• To investigate the specific role of Piezo1 in PASMCs in the development and progression of PH.
• To determine if targeting Piezo1 in PASMCs can ameliorate PH-related pathology.

Main Methods:

• Assessed Piezo1 expression in PASMCs and lung tissues from PH patients.
• Utilized smooth muscle cell-specific, conditional Piezo1 knockout mouse models.
• Evaluated Piezo1 function in isolated mouse lungs, pulmonary arteries, and in vivo after chronic hypoxia-induced PH.

Main Results:

• PASMCs from PH patients showed elevated Piezo1 expression and proliferation.
• Piezo1 knockout in PASMCs prevented hypoxia-induced proliferation and reduced vasoconstriction.
• Piezo1-deficient mice were protected against PH, exhibiting improved hemodynamics and preserved lung capillaries.

Conclusions:

• Piezo1 in PASMCs is a critical mediator in PH pathogenesis.
• Targeting Piezo1 influences pulmonary vascular tone, arterial remodeling, and endothelial cell senescence.
• Piezo1 represents a potential therapeutic target for treating pulmonary hypertension.