ABSTRACT
Objective To prepare a new type of micropore porcine acellular dermis matrix with the aid of laser (LPADM),and to validate the healing effect of the LPADM through the phrase Ⅰ composite transplanting on the back of the full- thickness skin defects in SD rats.Methods In vitro,the allogeneic fibroblasts were separately cultured with the LPADM (LPADM group) or the non-pore PADM (non-pore LPADM group),while fibroblasts cultured by pure medium were used as control.After culture of 1 day,3 days and 5 days,the contents of IL-10,IL-6,TGF-β1,LN,VEGF expressed by fibroblasts were determined by double-antibody sandwich ELISA method.In vivo,the phrase Ⅰ transplantations of LPADM graft with split-thickness autologous skin were carried on the backs of the full-thickness cutaneous defects of SD rats.The healing condition was observed and analyzed by histological tests.Results The differences of the absorbance value between the LPADMgroup,PADM group and control group in each day were not statistically significant (F=0.050-1.763,P＞0.05).The transplantation of LPADM graft with split-thickness autologous skin graft resulted in high rate of surviving without signs of rejection 3 weeks later.After 1-month of transplantation,the regenerated skin was well enough to be lifted without any serious scars.Conclusions The phrase Ⅰ transplantation of LPADM graft with split-thickness autologous skin graft can accelerate the healing process of full-thickness skin wounds with high biological safety.
ABSTRACT
Objective To investigate the clinical effect of acellular allogenic dermis combined with split-thickness autogenous skin graft for coverage of wound in extremity joint. Methods After contraction scar, giant pigmented nevus and capillary hemangioma being removed, acellular allogenic dermis with split-thickness autogenous skin graft was used to repair 25 cases of wounds of elbow, ankle, knee and wrist joints. The area of wounds was from 7cm?11cm to 12cm?19cm. Out of 25 wounds, there were 4 in wrist, 8 in elbow, 7 in ankle and 6 in knee joints. The survival rate of graft skin and improvement degree of joint function were observed. Results All grafts survived and had the smooth surface without obvious pigmentation and wound contraction. The function of joint was significantly improved after operation. Conclusion Tissue-engineered dermis with autogenous epithelium is an ideal graft for coverage of various wounds in extremity joint.
ABSTRACT
Objective To build artificial dermis by using the acellular dermis,collagen membrane and collagen gel as scaffolds.Methods The fibroblasts were isolated from infant skin.The 3~(rd) generation cells were seeded into 3 different scaffolds.The artificial dermis was detected by HE staining,phase contrast microscope or scanning electron microscope.Results The fibroblasts implanted on the ADM began to rupture and died after 2 to 3 days.Though the fibroblasts proliferated well in collagen gel,the artificial dermis contracted obviously.Another artificial dermis contracted slightly by inoculating fibroblasts on collagen membrane,and the fibroblasts on them were in appropriate proliferation.Conclusion The artificial dermis built by collagen membrane as scaffolds has a preferable structure for an ideal substitute of skin.