Enhanced PIEZO1 Function Contributes to the Pathogenesis of Sickle Cell Disease

Area of Science:

• Hematology
• Molecular Biology
• Physiology

Background:

• Sickle cell disease (SCD) involves red blood cell (RBC) dehydration and hemolysis due to altered cation permeability.
• PIEZO1, a mechanosensitive cation channel, regulates RBC volume and its gain-of-function mutations cause hemolytic anemia.

Purpose of the Study:

• To investigate the role of PIEZO1 in SCD pathophysiology.
• To determine if dietary interventions can modulate PIEZO1 function in SCD.

Main Methods:

• Assessed PIEZO1 channel function in human and mouse sickle erythrocytes.
• Administered a diet enriched with eicosapentaenoic acid (EPA) to a mouse model of SCD.
• Measured hemolysis and inflammatory markers.

Main Results:

• PIEZO1 function is upregulated in sickle erythrocytes, similar to gain-of-function mutations.
• EPA-enriched diet reduced PIEZO1 activity, hemolysis, and inflammation in SCD mice.
• EPA treatment improved cation permeability and reduced dehydration in sickle erythrocytes.

Conclusions:

• Upregulated PIEZO1 contributes to sickle erythrocyte dehydration and hemolysis in SCD.
• Dietary EPA shows therapeutic potential by reducing PIEZO1-mediated cation leak and hemolysis.
• Targeting PIEZO1 offers a novel strategy for SCD treatment.