Piezo1 selectively enhances TGF-β1-induced IgA class switching by B cells

Area of Science:

• Immunology
• Cell Biology
• Biophysics

Background:

• Piezo1 is a mechanosensitive ion channel involved in cellular processes like gene transcription and cell migration.
• While Piezo1's role in T cell differentiation and B cell responses is suggested, its specific function in B cell antibody production remains unclear.

Purpose of the Study:

• To investigate the role of Piezo1 in immunoglobulin A (IgA) class switching and antibody production in mouse B cells.
• To elucidate the molecular mechanisms by which Piezo1 influences IgA production.

Main Methods:

• Quantitative real-time PCR (qRT-PCR) to measure gene expression.
• Flow cytometric analysis to assess surface IgA expression.
• Isotype-specific ELISA to quantify IgA production.
• Use of Piezo1 agonist (Yoda1) and inhibitor (OB-1).
• Piezo1 knockdown B cells were utilized.

Main Results:

• The Piezo1 agonist Yoda1 upregulated TGF-β1-induced germline α transcripts (GLTα), post-switch α transcripts, surface IgA expression, and IgA production.
• The Piezo1 inhibitor OB-1 and Piezo1 knockdown reduced IgA class switching and IgA production.
• Piezo1 was found to enhance TGF-β1-induced Smad3 phosphorylation.

Conclusions:

• Piezo1 selectively enhances TGF-β1-induced IgA class switching.
• The mechanism involves Piezo1-mediated Smad3 phosphorylation, leading to increased IgA production in B cells.