优选人脱细胞真皮基质及荧光标记示踪与其复合培养的成纤维细胞

目的 优选人脱细胞真皮基质(ADM)并评价其生物学特性. 方法 通过高渗盐-NaOH消蚀法(A组)、高渗盐-十二烷基硫酸钠(SDS)法(B组)和DispaseⅡ-Triton X-100法(C组)制作人脱细胞真皮基质,以特殊染色、免疫组织化学观察3种方法 制作ADM的组成成分;四甲基偶氮唑盐(MTT)细胞毒性实验评价3种方法 制作ADM的细胞毒性反应;细胞培养法评价其细胞相容性,优选ADM .重组腺病毒绿色荧光表达载体(Ad-GFP)转染的人成纤维细胞(FB)接种在优选ADM上,荧光显微镜观察 FB的生长情况. 结果 3种方法 均能够保留胶原纤维、弹性纤维, A组和C组能够完全脱去细胞,B组未能完全脱去细胞;A组和B组制备ADM细胞毒性反应小于1级;C组制备ADM细胞毒性反应大于1级.A组与B组24h 3T3细胞贴壁数有统计学意义( P <0.05),3T3细胞能够在A组ADM表面贴附;优选A组ADM.转染Ad-GFP的FB在优选ADM上生长和增殖良好. 结论 高渗盐-NaOH消蚀法制备的ADM蕴涵丰富的生物信息,细胞毒性小,生物相容性好,是一种很好的生物支架材料.

Study on optimizing human acellular dermal matrix and fluorescence labeling the Co-cultured fibroblasts

Objective To optimize human acellular dermal matrix(ADM) and evaluate its biological characters. Methods Human skin was treated with hypertonic saline followed by NaOH maceration(group A), hypertonic saline followed by sodium dodecyl sulfate (SDS) detergent(group B) or Dispase Ⅱ followed by Triton X-100(group C), the resulting ADM were sectioned, and then were stained by special immunohistochemistry method. The cytotoxicity of them were evaluated by methyl thiazolyl tetrazolium (MTT) colorimetry and then cell compatibility was analyzed by cell culture;The optimized ADM resulted was choosen for use. Fibrablasts(FBs)were transfected with adenovirus vector encoding green fluorescent protein gene(Ad-GFP)and the growth of them on the optimized ADM was observed by fluorescent microscopy. Results Collagen and elastic fibers can still be observed in three kinds of ADM. The cells in dermis can be disintegrated both in group A and C, but not in group B. The cytotoxicity scores of the ADM prepared in group A and B were grade 0 or grade 1, while that of group C was more than grade 1.The ADM prepared by NaCl-NaOH maceration had good biocompatibility. There was statistical difference in adhering number of NIH3T3 cells in group A and B. NIH3T3 cells grew well in group A and the resulted ADM was optimized. FBs transfected with Ad-GFP grew well in the optimized ADM. Conclusion The ADM prepared by NaCl-NaOH maceration was a good tissue engineering biomaterial with a little cytotoxicity and rich in resouce.