Optimizing α-Gal Epitope Removal in Porcine Dermal Matrix: Enzyme Selection and Tissue Form Matter

Area of Science:

• Biomaterials Science
• Immunology
• Biotechnology

Background:

• Porcine acellular dermal matrix (pADM) is a xenograft material.
• Residual α-Gal epitopes in pADM can trigger adverse immune responses and xenograft failure.
• Effective reduction of α-Gal epitopes is crucial for xenograft safety and efficacy.

Purpose of the Study:

• To evaluate decellularization and α-galactosidase treatment for eliminating α-Gal epitopes in pADM.
• To compare the efficacy of different α-galactosidases (Aspergillus vs. Coffea).
• To investigate the influence of tissue form (intact vs. microparticle) on epitope removal.

Main Methods:

• Decellularization of porcine dermis to create pADM.
• Treatment of intact pADM and pADM microparticles with Aspergillus and Coffea α-galactosidases.
• Quantification of residual α-Gal epitopes post-treatment.

Main Results:

• Decellularization removed approximately 80% of α-Gal epitopes, leaving ~20% in pADM.
• Coffea α-galactosidase effectively eliminated epitopes from intact pADM, unlike Aspergillus α-galactosidase.
• Both Aspergillus and Coffea α-galactosidases equally removed epitopes from pADM microparticles.
• Tissue form significantly impacted enzymatic cleavage efficacy.

Conclusions:

• The choice of α-galactosidase and tissue form is critical for efficient α-Gal epitope reduction in pADM.
• Coffea α-galactosidase is suitable for intact pADM, while both enzymes are effective on microparticles.
• Findings provide guidance for developing safer xenogeneic grafts and tissue scaffolds.