Adipose tissue engineering using mesenchymal stem cells attached to injectable PLGA spheres

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Soft tissue defect reconstruction presents significant challenges in plastic surgery.
• A clinical need exists for effective solutions to reconstruct soft tissue defects.

Purpose of the Study:

• To differentiate mesenchymal stem cells (MSCs) into adipocytes.
• To assess the feasibility of constructing adipose tissue using MSCs attached to injectable poly(lactic-co-glycolic acid) (PLGA) spheres.
• To design injectable PLGA spheres for scar-free transplantation.

Main Methods:

• Mesenchymal stem cells (MSCs) and adipocyte-differentiated MSCs (adipo-MSCs) were attached to PLGA spheres.
• Cells and spheres were cultured for 7 days.
• The constructs were injected into nude mice and evaluated after 2 weeks.
• Lipid accumulation was assessed in vitro, and tissue formation was evaluated in vivo using techniques like GFP tracing, Oil Red O staining, and Western blotting.

Main Results:

• In vitro studies showed significantly higher lipid accumulation in adipo-MSCs compared to MSCs.
• In vivo, the group injected with adipo-MSCs on PLGA spheres (APLGA) exhibited massive new tissue formation.
• The control group with MSCs on PLGA spheres (MPLGA) showed minimal tissue formation.
• GFP testing confirmed the newly formed tissue originated from the injected MSCs.
• Oil Red O staining and Western blot analysis (expression of PPARγ and C/EBPα) confirmed the formation of actual adipose tissue in the APLGA group.

Conclusions:

• Injectable PLGA spheres effectively support the differentiation of MSCs into adipocytes.
• This approach provides an efficient model for adipose tissue engineering.
• The developed method holds potential for addressing soft tissue defects in plastic and reconstructive surgery.