ABSTRACT
BACKGROUND:Studies have found that smal intestinal submucosa that is directly implanted into the lesion cannoteffectively promote celgrowth and differentiationin vivoandin vitro, because of its smal pore size and poor permeability. OBJECTIVE:To establish the smal intestinal submucosa sponge and to explore its morphological characteristics. METHODS:Porcinesmall intestinal submucosa was prepared by physiochemical method. Thenthe small intestinal submucosa with the mass fraction of 1%, 2%, 3% and 4% was cross-linked by 50, 100 and150 mmol/L 1-ehyl-3-(3-dimethylaminopropyl) carbodimide hydrochloride, respectively, so as to obtain smal intestinal submucosa sponge, whose morphology was detected by lighting and scanning electron microscope. In the meanwhile, smal intestinal submucosa as control group, and smal intestinal submucosa sponge as test groupwere intramuscularly implanted into the back of rats,respectively. At 1, 2 and 3 weeks after implantation, histological changes andimplantdegradation were observed by hematoxylin-eosin staining. RESULTS AND CONCLUSION:The smal intestinal submucosa sponge, which was prepared by the smal intestinal submucosa with the mass fraction of 1% and 100 mmol/L cross-linking agent, had elastic and close space structure, uniform pore size and regular structure, so it was selected as the implant into themuscle.At 1 week after implantation, in the test group,the mesh sponge had the complete structure withfew neutrophils, lymphocytes and giant cel reaction, andsoft tissue hyperplasia and migration surrounding the implant appeared;in the control group,there were numerous inflammatory cels, and wound adhesion and little migration of surrounding tissues could be found.At 3 weeks, inflammatory cels mostly disappeared, and fibroblast-like cels and vascular components appeared, with thinner and regular colagen fiber bundles, and connective tissue-like structures could be found. In contrast, the control group stil had numerous inflammatory cels and few colagen fibers. In conclusion, smal intestinal submucosa sponge isapotential material used asthe tissue-engineered skinscaffold.