Beta-Glucan: A Macrophage Differentiation Modulator That Accelerates the Wound Healing Response

Area of Science:

• Immunology
• Wound Healing
• Biomaterials

Background:

• Beta Glucans (β-glucans) are polysaccharides with known wound healing benefits.
• Understanding their immunomodulatory effects on macrophages is key to optimizing therapeutic applications.

Purpose of the Study:

• To investigate how β-glucans influence macrophage polarization during wound healing.
• To evaluate the efficacy of β-glucan hydrogel in accelerating excisional wound closure and modulating the inflammatory response.

Main Methods:

• Human monocytes were differentiated into M0, M1, and M2 macrophages in vitro, with β-glucan treatment assessed via flow cytometry.
• A murine full-thickness excisional wound model was used, treating wounds with β-glucan hydrogel or vehicle.
• Wound closure rate, inflammatory cell infiltration (neutrophils, M2 macrophages), and matrix deposition were analyzed.

Main Results:

• β-glucan promoted M0 macrophage differentiation but inhibited M1 pro-inflammatory macrophage polarization.
• In vivo, β-glucan hydrogel accelerated wound healing, characterized by an earlier, resolved inflammatory phase.
• Wounds treated with β-glucan showed increased M2 macrophages and decreased neutrophils, with no significant impact on matrix deposition.

Conclusions:

• β-glucans effectively modulate macrophage differentiation, favoring an anti-inflammatory M2 phenotype.
• β-glucan hydrogel accelerates excisional wound healing by managing inflammation without negatively affecting matrix formation.
• β-glucans represent a promising therapeutic strategy for managing chronic and acute wounds.