Site-dependent acellularisation effects explain altered tissue mechanics: ultrastructural insights.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Histology

Background:

• Acellular scaffolds are crucial for soft tissue repair, providing a matrix for cell remodeling.
• Sodium-dodecyl-sulphate (SDS) is used for acellularization, but its effects on the extracellular matrix (ECM) vary by tissue.
• Understanding tissue-layer specific ECM changes is vital for scaffold development.

Purpose of the Study:

• To investigate the impact of SDS acellularization on the ECM of different tissue layers.
• To analyze site-dependent alterations in collagen organization within porcine ureters, oesophagi, and skin.

Main Methods:

• Porcine ureters, oesophagi, and skin samples were acellularized using SDS.
• Control samples remained in a native state.
• Histological and ultrastructural electron microscopy were employed for analysis.

Main Results:

• Acellularization with SDS led to moderate to strong decreases in collagen density and clumping across all tissues.
• Collagen bundle alignment changed differently across tissue layers: straightening to coiling in ureter intima and oesophagus, and vice versa in ureter media/adventitia.
• Skin samples showed discontinuous acellularization with collagen curling and subepidermal disruptions, while fiber integrity remained intact.

Conclusions:

• SDS-induced acellularization causes significant, site-specific alterations in ECM collagen organization.
• These ECM changes provide a basis for understanding the increased stiffness observed in acellularized ureters and skin.
• Further research into tissue-specific ECM remodeling is essential for optimizing acellular scaffold design.