Hydrogen Sulfide Promotes Osteogenesis by Modulating Macrophage Polarization

Area of Science:

• Immunology
• Biochemistry
• Regenerative Medicine

Background:

• Macrophages are crucial for bone repair.
• Hydrogen sulfide (H₂S) plays a role in bone formation and regeneration.
• The influence of H₂S on macrophage polarization in bone regeneration is not well understood.

Purpose of the Study:

• To investigate the effect of H₂S on macrophage polarization.
• To determine the impact of H₂S-modulated macrophages on bone regeneration.

Main Methods:

• Utilized the H₂S-donor GYY4137 to treat macrophages.
• Assessed macrophage polarization markers (CD-206, IL-10, i-NOS, TNF-α).
• Co-cultured treated macrophages with osteoblastic MC3T3-E1 cells to evaluate bone regeneration markers (cell viability, mineralization).

Main Results:

• GYY4137 treatment shifted M0/M1 macrophages towards an M2-like phenotype, indicated by increased CD-206 and IL-10, and decreased i-NOS and TNF-α.
• Co-culture with GYY4137-treated M0 macrophages enhanced MC3T3-E1 cell viability.
• Significant promotion of mineralized particle formation in MC3T3-E1 cells was observed when co-cultured with IL-4-treated and GYY4137-treated M0 macrophages.

Conclusions:

• Hydrogen sulfide promotes macrophage M2 polarization.
• H₂S-induced M2 macrophages enhance osteoblast viability and function.
• Hydrogen sulfide is a potential therapeutic agent for promoting bone regeneration.