Body wall repair using small intestinal submucosa seeded with cells.

Objective: Prosthetic repair of large ventral abdominal wall defects has been associated with high complication rates. This study was aimed at applying tissue engineering to body wall replacement.

Methods: Syngeneic Lewis rats underwent harvest of skeletal muscle specimens. Once expanded in vitro, skeletal muscle cells or fibroblasts were suspended in a collagen gel. All animals underwent creation of a 2.5- x 3-cm abdominal wall defect. The defect was repaired with the cell-seeded gel placed in between 2 pieces of small intestinal submucosa (SIS). The control group was repaired by SIS with acellular gel. Animals were killed at different time-points for histologic and mechanical examination. Statistical analysis was by analysis of variance (ANOVA).

Results: Abdominal wall hernia was present in 6 of 24 fibroblast-seeded constructs (25%), 5 of 21 skeletal muscle cell-seeded constructs (23.9%), and 16 of 21 acellular grafts (76.2%), respectively (P <.05). At harvest, cell-seeded constructs were thicker with better cellular infiltration, whereas acellular grafts were thin, low in cell density, and poor in mechanical resistance.

Conclusions: Unlike acellular collagen matrices, engineered cellular constructs have better cell infiltration and mechanical performance. Tissue engineering may be a viable alternative for body-wall replacement.