无细胞异种真皮与表皮细胞悬液复合移植的研究

目的　研究用无细胞异种真皮与表皮细胞悬液复合移植的效果及组织学变化。方法　将 4 2只裸鼠分为实验组及对照组 ,实验组于背部全层皮肤缺损创面移植无细胞异种真皮及人表皮细胞悬液 ,对照组单纯移植人表皮细胞悬液。于术后 2、3和 5周计算创面愈合率 ,术后 3、6和 12周计算创面收缩率 ,并取活检行组织学检测。结果　实验组创面愈合率高 ,分别为 79.1%± 4 .5 % ,89.6 %± 4 .4 % ,98.1%± 3.4 % ,收缩程度轻为 16 .3%± 5 .2 % ,2 5 .5 %±7.2 % ,32 .5 %± 7.1% ,外观平整 ,质地良好 ,胶原纤维排列整齐 ,基底细胞桥粒 -半桥粒结构及基底膜等结构重建明显 ,未见明显的急性排斥反应 ;对照组创面愈合率分别为 6 9.2 %± 4 .9% ,78.2 %± 7.6 % ,90 .6 %± 5 .0 % ,收缩率为2 0 .5 %± 6 .0 % ,31.3%± 6 .9% ,4 4 .6 %± 7.2 % ,与实验组相比 ,均有统计学意义 (P<0 .0 5 ) ,愈合后的表皮质地薄 ,易破溃 ,胶原纤维紊乱 ,表皮 -真皮连接结构重建不明显。结论　无细胞异种真皮与表皮细胞悬液复合移植修复创面 ,可改善创面愈合质量。

EXPERIMENTAL STUDY ON TRANSPLANTATION OF ACELLULAR XENO-DERMIS AND SUSPENDED KERATINOCYTES

Objective To investigate the outcome and histological changes of transplantation of acellular xeno dermis combined with suspended keratinocytes. Methods Forty two nude mice with full thickness skin defect on the back were randomly divided into 2 groups, then acellular xeno dermisand and suspended keratinocytes were adopted to cover the skin defect in the experimental group, pure suspended keratinocytes in the control group. The area of wound healing was calculated 2, 3 and 5 weeks after transplantation, and the rates of wound contraction were also calculated, and biopsy for histological examination was performed 3, 6 and 12 weeks after transplantation. Results Compared with the experimental group, the control group showed delayed wound healing ( P< 0.05), intensive wound contraction ( P< 0.05), poor durability, elasticity, and cosmetic appearances as well as disordered collagen fibers. In contrast, it was observed that the proliferation of collagen fibers was regularly organized, with no obvious acute immuno rejection responses in the experimental group. Conclusion The composite transplantation of acellular xeno dermis and suspended keratinocytes could promote the wound healing with a satisfactory outcome.