Interaction between Ras and Bcl2L12 in B cells suppresses IL-10 expression

Area of Science:

• Immunology
• Cell Biology
• Molecular Medicine

Background:

• Recurrent tonsillitis pathogenesis requires further investigation.
• Interleukin-10 (IL-10) is crucial for immune regulation.
• Ras activation is implicated in various immune disorders.

Purpose of the Study:

• To investigate the role of Ras activation in downregulating IL-10 expression in tonsillar B cells.
• To explore the mechanism by which Ras activation affects IL-10 levels in the context of recurrent tonsillitis.

Main Methods:

• Isolation of B cells from surgically removed tonsil tissues of patients with recurrent acute tonsillar inflammation using flow cytometry.
• Analysis of Ras activation, IL-10, and Bcl2L12 expression using Ras-specific enzyme-linked immunosorbent assay and immunological methods.
• Investigation of the interaction between Bcl2L12, GTPase activating protein (GAP), and Ras, and the involvement of the MAPK/Sp1 pathway.

Main Results:

• Tonsillar B cells (tBC) from inflamed tonsils exhibited higher Ras activation, lower IL-10, and higher Bcl2L12 expression compared to peripheral B cells (pBC).
• Bcl2L12 formed a complex with GAP, inhibiting Ras deactivation and promoting its activation.
• Ras activation, via the MAPK/Sp1 pathway, increased Bcl2L12 expression, which in turn suppressed IL-10 production in tBCs.
• Inhibition of Ras or its signaling pathway counteracted the suppression of IL-10 expression.

Conclusions:

• Bcl2L12 interacts with Ras activation to impair immune tolerance in tonsils by reducing IL-10 expression in tBCs.
• Targeting Bcl2L12 presents a potential strategy to restore IL-10 expression and immune tolerance in recurrent tonsillitis.