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人骨髓间充质干细胞的转分化在聚(L-乳酸)-共-聚(ε-己内酯)/胶原纳米纤维支架上生成功能性肝球。

Trans-differentiation of human mesenchymal stem cells generates functional hepatospheres on poly(l-lactic acid)-co-poly(ε-caprolactone)/collagen nanofibrous scaffolds.

作者信息

Bishi Dillip Kumar, Mathapati Santosh, Venugopal Jayarama Reddy, Guhathakurta Soma, Cherian Kotturathu Mammen, Ramakrishna Seeram, Verma Rama Shanker

机构信息

Healthcare and Energy Materials Laboratory, Nanoscience and Nanotechnology Initiative, Faculty of Engineering, National University of Singapore, Singapore.

出版信息

J Mater Chem B. 2013 Aug 28;1(32):3972-3984. doi: 10.1039/c3tb20241k. Epub 2013 Jul 1.

Abstract

Mesenchymal stem cell (MSC)-based liver tissue engineering on nanofibrous scaffold holds great promise for cell-based therapy in liver injuries and end-stage liver failure treatments. We investigated the hepatic trans-differentiation potential of human MSCs on a biocomposite poly(l-lactic acid)-co-poly (ε-caprolactone)/collagen (PLACL/collagen) nanofibrous scaffold. The nanofibrous scaffolds comprised of PLACL, collagen and a PLACL/collagen blend (2 : 1) were fabricated by electrospinning and also evaluated for fiber morphology, surface wettability, functional groups, porosity and tensile properties. Hepatic trans-differentiation of human bone marrow-derived MSCs (hMSCs) was carried out on these scaffolds over a period of 28 days using sequential induction with hepatogenic growth factors. Hepatogenesis was confirmed by scanning electron microscopy (SEM), cell phenotype tracking dye expression, quantitative expression of hepatic genes, immunofluorescence staining of hepatocyte-specific markers and albumin release. The results proved that the porous PLACL/collagen nanofibrous scaffold supported enhanced hMSC proliferation and hepatic trans-differentiation compared to individual PLACL and collagen scaffolds as well as a monolayer culture on tissue culture plate (TCP). Interestingly, hMSC-derived hepatocyte-like cells on PLACL/collagen nanofibrous scaffolds could aggregate to form functional 'hepatospheres' similar to normal hepatic spheroids. The present study concludes that PLACL/collagen nanofibrous scaffolds are potentially biomimetic and upon sequential induction with hepatogenic growth factors/cytokines, it augments trans-differentiation of hMSCs towards functional hepatosphere formation. Such bioengineered nanofibrous scaffold hepatic construct provides a promising approach for cellular therapy of damaged livers in end-stage liver failure treatments.

摘要

基于间充质干细胞(MSC)的纳米纤维支架肝脏组织工程在肝脏损伤和终末期肝衰竭治疗的细胞治疗方面具有巨大潜力。我们研究了人MSC在生物复合聚(L-乳酸)-共-聚(ε-己内酯)/胶原蛋白(PLACL/胶原蛋白)纳米纤维支架上的肝转分化潜力。通过静电纺丝制备了由PLACL、胶原蛋白和PLACL/胶原蛋白共混物(2∶1)组成的纳米纤维支架,并对其纤维形态、表面润湿性、官能团、孔隙率和拉伸性能进行了评估。使用肝源性生长因子进行序贯诱导,在这些支架上对人骨髓来源的MSC(hMSC)进行了28天的肝转分化。通过扫描电子显微镜(SEM)、细胞表型追踪染料表达、肝脏基因的定量表达、肝细胞特异性标志物的免疫荧光染色和白蛋白释放来确认肝细胞生成。结果证明,与单独的PLACL和胶原蛋白支架以及组织培养板(TCP)上的单层培养相比,多孔PLACL/胶原蛋白纳米纤维支架支持hMSC增殖和肝转分化增强。有趣的是,PLACL/胶原蛋白纳米纤维支架上hMSC来源的肝细胞样细胞可以聚集形成类似于正常肝球体的功能性“肝球体”。本研究得出结论,PLACL/胶原蛋白纳米纤维支架具有潜在的仿生功能,在肝源性生长因子/细胞因子的序贯诱导下,可增强hMSC向功能性肝球体形成的转分化。这种生物工程纳米纤维支架肝脏构建体为终末期肝衰竭治疗中受损肝脏的细胞治疗提供了一种有前景的方法。

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