Regeneration of diaphragm with bio-3D cellular patch

Area of Science:

• Regenerative Medicine
• Biomaterials Engineering
• Paediatric Surgery

Background:

• Congenital diaphragmatic hernia (CDH) in neonates often necessitates surgical repair using patches.
• Current mesh patches have limitations including foreign material complications and hernia recurrence.
• There is a critical need for advanced biomaterials for CDH repair.

Purpose of the Study:

• To develop and evaluate a novel scaffold-free, bio-3D printed human cell patch for diaphragmatic defect repair.
• To assess the safety, efficacy, and tissue integration of these cellular patches in a preclinical model.

Main Methods:

• Utilized a novel bio-3D printing technique to create large, scaffold-free tissue patches from human cells.
• Transplanted the generated cellular patches into rats with surgically induced diaphragmatic defects.
• Monitored survival, tissue integration via CT scans, and histological regeneration over an extended period (710 days).

Main Results:

• The bio-3D printed cellular patches exhibited high elasticity and strength.
• All implanted rats survived for over 710 days, indicating high biocompatibility and safety.
• CT and histological analyses confirmed complete tissue integration, muscle regeneration, neovascularization, and neuronal network formation within the repaired diaphragms.

Conclusions:

• Scaffold-free, bio-3D printed human cell patches represent a safe and effective therapeutic strategy for diaphragmatic defect repair.
• These cellular constructs demonstrate excellent tissue integration and regenerative potential, overcoming limitations of current mesh materials.
• The findings strongly support the advancement of this technology towards clinical trials for paediatric CDH treatment.