中文摘要：

背景：大多哺乳类细胞在正常生理状态下多以三维结构存在，为还原细胞本身在体内的自然状态，很多研究者开始尝试在体外对细胞进行三维培养，球形培养是一种常见的三维培养模式。目的：尝试用3种不同的方法在体外对人脂肪干细胞进行球形培养，并观察其生物学特征。 方法：对提取的脂肪来源细胞进行表面 Marker 流式检测以及成脂成骨诱导鉴定后，证实为脂肪干细胞。先后用低黏附培养法、hanging-drop培养法和Eppendorf管培养法3种方法在体外对脂肪干细胞进行球形培养，对3种方法形成球形的特点进行比较分析，并通过 Imagej 软件计算出3组多细胞球体的平均面积，利用Viability/Cytotoxicity Assay Kit for Animal Live＆amp;Dead Cel s试剂盒对3组多细胞球体进行活力检测。结果与结论：①通过流式细胞术鉴定细胞表型标志物，其中CD29，CD44，CD59完全阳性，同时成脂成骨诱导也为阳性，证实提取的细胞为脂肪干细胞。3代以内脂肪干细胞多呈长梭形，并克隆状生长。②低黏附培养法、hanging-drop 培养法、Eppendorf 管培养法均可使脂肪干细胞聚集成球形生长，但所成多细胞球形有所差异。低黏附培养法所形成的细胞球形大小不一，不易控制；而hanging-drop培养法和Eppendorf管培养法均可使脂肪干细胞形成大小均一的球形，但在大小和形成时间上有所不同。③3种不同方法所形成的球形细胞均保持较好的细胞活力。

英文摘要：

BACKGROUND：Many types of mammalian cells aggregate and display three-dimensional multicellular spheroids when they are in normal physiological conditions. In order to observe and explore cellular natural states, many researchers try to use spherical cellculture in vitro, a common three-dimensional culture pattern. OBJECTIVE：To use three different methods for spherical culture in vitro of adipose-derived stem cells and to observe their biological features. METHODS：Adipose-derived stem cells were confirmed by the analysis of the markers for cellphenotypes as wel as adipogenic and osteogenic differentiation potential assays. Three different methods of sphere cultures were used as fol ows：（1） ultra low attachment culture;（2） hanging-drop culture and （3） Eppendorf tube culture. The sphere formation was compared among above three methods. We used Imagej to calculate mean areas of these spheres. And we used Viability/Cytotoxicity Assay Kit for Animal Live＆amp;Dead cells to detect their vitality. RESULTS AND CONCLUSION：（1） Adipose-derived stem cells were confirmed by the analysis of the markers for cellphenotypes, CD29, CD44, CD59 were positive, as wel as adipogenic and osteogenic differentiation potential assays were positive. The conventional monolayer cultures of adipose-derived stem cells showed spindle and cloning growth within three passages. （2） Ultra low attachment culture, hanging-drop culture, Eppendorf tube culture al could elicit adipose-derived stem cells spherical growth. However, spherical size, shape and uniformity differed depending on cellnumbers, culture time and spherical culture methods. The ultra low attachment culture was comparatively difficult to control spherical shape and uniformity of adipose-derived stem cells. But hanging-drop culture and Eppendorf tube culture were able to form even cellspheres. （3） Spherical formation of adipose-derived stem cells using our three methods displayed good cellvitality.