在2D及3D環境培養人類脂肪幹細胞其多能性及分化能力;Pluripotency and Differentiation Ability of Human Adipose-Derived Stem Cells Culture in 2-D and 3-D culture

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Title:	在2D及3D環境培養人類脂肪幹細胞其多能性及分化能力;Pluripotency and Differentiation Ability of Human Adipose-Derived Stem Cells Culture in 2-D and 3-D culture
Authors:	謝肇文;Hsieh, Chao-Wen
Contributors:	化學工程與材料工程學系
Keywords:	人類脂肪幹細胞;2D培養;3D培養;多能性;分化能力;human Adipose-derived Stem cells;2D cultivation system;3D cultivation system;Pluripotency;Differentiation Ability
Date:	2017-08-22
Issue Date:	2017-10-27 13:00:05 (UTC+8)
Publisher:	國立中央大學
Abstract:	充間質幹細胞於再生醫學領域中被普遍認為是十分具有潛力的細胞來源相較於胚胎幹細胞以及誘導多能性幹細胞。這是因為充間質幹細胞不會如胚胎幹細胞產生道德方面的疑慮以及誘導多能性幹細胞在體內會有產生腫瘤發生的可能。但應用上的問題則在於充間質幹細胞會有無法長久培養及多能性遠遠低於胚胎幹細胞和誘導多能性幹細胞。在之前的研究發現，人類脂肪幹細胞在TCPS培養盤上，其多能性基因 (Oct4,Sox2,Nanog)會急速的下降。但相較於含有許多細胞自脂肪中所萃取出的SVF溶液以及在培養液中懸浮培養圓球體符合幹細胞在胚胎中最原始的型態，培養在TCPS培養盤上面的多能性則遠遠不足。在此研究中，我們在TCPS培養盤以及Ultra low attachment培養盤上面培養人類脂肪幹細胞。幹細胞會貼附在TCPS培養盤上並開始生長於表面，稱之為2D培養。則細胞培養在Ultra low attachment培養盤中，人類脂肪幹細胞會懸浮於培養液中所以稱為3D培養。在一段時間的培養後，我們會因為其培養環境不同去比較其多能性以及分化人類脂肪幹細胞為成骨細胞，軟骨細胞去比較培養環境的不同其分化能力。並透過免疫螢光染色法以及多能性基因的檢測去比較兩種培養方式的多能性。結果顯示在懸浮培養中，其多能性都會優於培養在TCPS培養盤上的幹細胞。甚至於，培養在較低多能性的TCPS培養盤上後，幹細胞接著被培養在懸浮培養環境中，我們發現其多能性會回復以及維持較高多能性。分化能力亦然，不論是成骨分化或者軟骨分化，懸浮培養出的幹細胞，其分化能力都優於貼附培養後的幹細胞。 ;Human adult stem cells, such as human adipose-derived stem cells, are considered to be an attractive source of stem cells than human embryonic stem cells (hESCs) and human induced pluripotent stem cells (hiPSCs). This is because human adult stem cells do not generate the ethical concerns that accompany in hESCs. Although human adipose-derived stem cells (hADSCs) are promising for use in regenerative medicine, their lower expansion ability (aging problem) due to the lower pluripotency of hADSCs compared with hESCs and hiPSCs is a critical issue. It’s found that the pluripotency gene expression of Oct4, Sox2, and Nanog in hADSCs after cultivation on TCPS dramatically decreased compared to those in the cells in stromal vascular fraction (SVF) as well as the cells in 3-D culture. There are high pluripotent stem cells in SVFs and 3-D culture, although SVF has more heterogeneous population compared to hADSCs cultured on tissue culture polystyrene (TCPS) dishes. It’s evaluated whether hADSCs can be explained by “Stochastic model” or “Elite model” by hADSCs culture in 2-D culture and 3-D culture sequentially. Precisely, we evaluated the difference of gene expression of the cells when hADSCs were cultured in the 2-D condition (TCPS) and in 3-D condition (ultra low attachment dish) sequentially. It is found that the pluripotent gene expression of hADSCs (Oct4, Sox2 and Nanog) in suspension (3-D culture) is higher than that on TCPS (2-D culture). Especially, low pluripotent gene expression of hADSCs cultured on TCPS is changed to be higher pluripotent gene expression after hADSCs are shifted in 3-D culture
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