Decellularized Adipose Matrix Rejuvenates Photoaged Skin through Immune Microenvironment Modulation

Area of Science:

• Biomaterials Science
• Immunology
• Dermatology

Background:

• Photoaging, caused by UV exposure, leads to skin damage and chronic inflammation.
• Current treatments focus on structural repair, neglecting immune modulation for skin regeneration.
• There's a need for biomaterials that restore extracellular matrix and regulate immune responses.

Purpose of the Study:

• To investigate the therapeutic potential of decellularized adipose matrix (DAM) for photoaged skin.
• To explore DAM's ability to modulate the skin's immune microenvironment.
• To assess DAM's impact on fibroblast function and skin rejuvenation.

Main Methods:

• Established a photoaged mouse model using UVB irradiation.
• Prepared DAM via physicochemical decellularization.
• Evaluated DAM's effects on macrophage polarization and fibroblast function in vitro.
• Developed and tested a hyaluronic acid-DAM hydrogel (HA/DAM) in vivo.

Main Results:

• DAM promoted M1 to M2 macrophage polarization in vitro.
• M2-conditioned medium enhanced fibroblast resistance to oxidative stress, migration, and ECM synthesis.
• In vivo, HA/DAM increased dermal thickness and collagen density.
• HA/DAM restructured the immune microenvironment via M2 macrophage polarization.

Conclusions:

• DAM effectively induces M2 macrophage polarization and rescues photoaged fibroblast function.
• This immune modulation offers a novel strategy for skin antiaging.
• DAM demonstrates significant clinical potential for skin rejuvenation.