B10 Promotes Polarization and Pro-Resolving Functions of Bone Marrow Derived Macrophages (BMDM) Through PD-1...

Area of Science:

• Immunology
• Cell Biology

Background:

• Regulatory B cells (Bregs) modulate immune responses.
• B-10 cells are key Breg subsets with potent immunoregulatory functions.
• Macrophage polarization is critical in inflammatory processes.

Purpose of the Study:

• To investigate the role of B-10 cells in macrophage polarization.
• To elucidate the involvement of the PD-1 signaling pathway in B-10 cell-mediated macrophage modulation.

Main Methods:

• Co-culture of mouse B-10 cells with bone marrow-derived macrophages (BMDMs).
• Utilized wild-type (WT) and PD-1 knockout (PD-1 KO) BMDMs.
• Employed direct contact and Transwell co-culture systems.

Main Results:

• Direct co-culture induced M2 anti-inflammatory macrophage polarization.
• Upregulated M2 markers (F4/80+, CD206+, CD163+) and genes (IL-1ra, IL-10, Arg-1).
• Enhanced macrophage phagocytosis and pro-resolving mediator secretion; PD-1 signaling was crucial.

Conclusions:

• B-10 cells promote anti-inflammatory macrophage phenotypes through PD-1 signaling.
• This interaction enhances macrophage function in resolving inflammation.
• Findings suggest PD-1-mediated B-10 cell activity as a therapeutic target for inflammatory diseases.