Molecular Weight-Driven Tunable Hyaluronic Acid-Based Hydrogels Modulate Immune Polarization in Three-Dimensional...

Area of Science:

• Biomaterials Science
• Immunology
• Regenerative Medicine

Background:

• Macrophage behavior is influenced by the extracellular matrix (ECM), with hyaluronic acid (HA) playing a key immunomodulatory role.
• Previous research on HA's immunomodulatory effects often used 2D cultures, limiting physiological relevance.
• Hyaluronic acid's effects are molecular weight (MW)-dependent, but in vivo conditions are complex to replicate.

Purpose of the Study:

• To investigate the molecular weight-dependent immunomodulatory effects of hyaluronic acid (HA) on macrophages within a 3D hydrogel system.
• To explore HA-based hydrogels as biomimetic scaffolds for controlling immune responses.

Main Methods:

• Fabrication of HA-based hydrogels with distinct biophysical properties using varying HA molecular weights (MWs) and PEG-SH4 cross-linking.
• Encapsulation of immortalized macrophages within the 3D HA hydrogels.
• Assessment of macrophage expression of pro-inflammatory and anti-inflammatory markers.

Main Results:

• Hydrogels incorporating high-MW HA significantly increased the expression of anti-inflammatory markers in macrophages.
• The biophysical characteristics of the HA hydrogels influenced the immunomodulatory effects of HA.
• Demonstrated MW-dependent immunomodulatory capacity of HA in a 3D environment.

Conclusions:

• High-molecular-weight hyaluronic acid in 3D hydrogels can promote an anti-inflammatory macrophage phenotype.
• HA-based hydrogels serve as effective ECM-mimetic scaffolds for modulating immune cell responses.
• Customizable HA hydrogels show promise for applications in regenerative medicine and immunomodulation.