Fetal subcutaneous cells have potential for autologous tissue engineering

Area of Science:

• Regenerative Medicine
• Developmental Biology
• Biomaterials Science

Background:

• Congenital malformations impact 3% of newborns, necessitating reconstructive surgery.
• Availability of autologous tissue for perinatal surgical implantation is crucial for infants with prenatally diagnosed soft tissue defects.

Purpose of the Study:

• To investigate fetal subcutaneous cells as a viable cellular source for tissue engineering applications.
• To assess the potential of these cells for creating autologous tissue transplants before birth.

Main Methods:

• Fetal subcutaneous biopsies were collected at 20-21 weeks gestation.
• Cells were isolated, expanded in vitro, and characterized for mesenchymal markers and differentiation potential.
• Cells were seeded onto small intestine submucosa or collagen gel matrices and cultured for up to 8 weeks to evaluate coverage, viability, proliferation, and angiogenesis.

Main Results:

• Fetal subcutaneous cells expanded to 43 population doublings and differentiated into adipogenic and osteogenic lineages.
• Cells demonstrated poor adherence and migration on small intestine submucosa but migrated and proliferated effectively in collagen gels for 8 weeks.
• Cells expressed mesenchymal markers (Ki67, CD73, α-smooth muscle actin) but not endothelial (CD31) or epithelial (cytokeratin) markers.

Conclusions:

• Fetal subcutaneous cells possess favorable characteristics for developing autologous tissue engineering constructs.
• These cells can be harvested during pregnancy for potential use in reconstructive surgery after birth.
• This approach supports the creation of patient-specific tissue grafts for treating severe congenital malformations.