Decellularized biologic muscle-fascia abdominal wall scaffold graft

Abstract

Background: Complex abdominal wall reconstruction using biologic mesh can lead to increased recurrence rates, nonincorporation, and high perioperative costs. We developed a novel decellularization method and applied it to porcine muscle fascia to mirror target-tissue architecture. The aims of this study were to analyze mechanical strength and tissue-graft incorporation.

Methods: After serial decellularization, muscle-fascia mesh was created and tested for mechanical strength and DNA content. The muscle-fascia mesh was implanted subcutaneously in rats (n = 4/group) and the cohorts killed 1 to 4 weeks later. Explants were examined histologically or immunohistochemically.

Results: Mechanical testing demonstrated equivalent strength compared with a commercially available biological mesh (AlloDerm), with mechanical strength attributable to the fascia component. Grafts were successfully implanted with no observable adverse events. Gross necroscopy revealed excellent subdermal scaffold engraftment. Microscopic evaluation identified progressive collagen deposition within the graft, neoangiogenesis, and presence of CD34 positive cells, in the absence of discernable graft rejection.

Conclusion: This study confirms a decellularization process can successfully create a DNA-free composite abdominal wall (muscle-fascia) scaffold that can be implanted intraspecies without rejection. Expanding this approach may allow exploitation of the angiogenic capacities of decellularized muscle, concomitant with the inherent strength of decellularized fascia, to perform preclinical analyses of graft strength in animal models in vivo.