人脂肪来源干细胞与膀胱脱细胞基质-丝素蛋白双层支架的生物相容性研究

目的观察人脂肪来源干细胞(Human adipose derived stem cells,h ASCs)在膀胱黏膜下脱细胞基质-丝素蛋白(Bladder acellular matrix graft-silk fibroin,BAMG-SF)双层支架材料中的生长情况,分析其生物相容性。方法取h ASCs,置于BAMG-SF浸提液中培养,CCK-8法检测其细胞活力,评价BAMG-SF支架的细胞毒性并绘制生长曲线。扫描电镜观察BAMG-SF双层支架材料的表面形貌。将h ASCs传代扩增后接种到BAMG-SF双层支架材料上,体外培养1周后,转至裸鼠皮下培养1周、2周,HE染色观察细胞在支架上的生长情况。HLA免疫荧光鉴定裸鼠皮下双层支架上细胞的种属来源。结果 h ASCs在BAMG-SF双层支架浸提液中可保持较高的增殖率,根据细胞相对增殖率与细胞毒性分级关系证实BAMG-SF双层支架浸提液无细胞毒性。由h ASCs在BAMG-SF浸提液和DMEM培养基中的生长曲线可知,BAMG-SF有利于h ASCs的生长。将h ASCs接种到BAMG-SF双层支架材料上,经过体外、内培养,h ASCs均能长入支架的空隙内,且体内培养比体外培养有更多的h ASCs细胞长入支架。HLA检测显示支架内细胞部分为h ASCs。结论新型BAMG-SF双层支架材料安全无毒,与h ASCs生物相容性好,可作为细胞载体应用于组织工程膀胱的研究。

Human Adipose-De rived Stem Cells and its Biocompatibility with Bladder Acellular Matrix Graft-Silk Fibroin Bilayer Scaffold

Objective To observe the growth of human adipose-derived stem cells （hASCs） in bladder acellular matrix graft-silk fibroin （BAMG-SF） bilayer scaffold and to analyze the biological compatibility of BAMG-SF with hASCs. Methods hASCs were isolated from human subcutaneous adipose tissue after collagenase digesting, filtrating and centrifuging, then cultured in the leaching solution of BAMG-SF. The cytotoxicity of scaffold was evaluated by CCK-8 cell viability assay, and the growth curves were also observed. Surface morphology on BAMG-SF was observed by scanning electron microscopy （SEM）. The hASCs of passage 3 were seeded onto the BAMG-SF bilayer scaffolds for 1 week, then the BAMG-SF bilayer scaffolds seeded with hASCs were transplanted into nude mouse for 1 week or 2 weeks. The growth of cells in BAMG-SF biomaterials was observed by HE staining. The species origin of these cells in the BAMG-SF scaffolds cultured in vivo was detected by Immunofluorescence. Results hASCs maintained high proliferation rate in the leaching solution of BAMG-SF and the BAMG-SF scaffolds were nontoxic absolutely. According to the growth curves of hASCs cultured in the leaching solution of the BAMG-SF and DMEM, BAMG-SF scaffolds were conducive to the growth of hASCs. The histological study found that hASCs could grow into the space of the BAMG-SF scaffolds after cultured in vitro and in vivo. There were more cells in the scaffolds cultured in vivo than in vitro. Immuno-fluorescence suggested that some of the cells inside the scaffolds were hASCs. Conclusion BAMG-SF bilayer scaffolds are nontoxic and have a good biocompatibility with hASCs, which can be used as a vehicle for hASCs in bladder defect reconstruction.