人類多功能幹細胞再生醫跟再生醫學領域來說是一種非常有吸引力的的細胞，因為它們具有多能性以至於可以去分化成不同的人體細胞。所以如何去培養人類胚胎幹細胞已經成為一個熱門的主題。通常在多數的細胞研究中需要換培養液，且培養液中的生長因子需要儲存在非常低溫的冰箱下不然會降解跟變形。而降解跟變形的生長因子是造成培養人類多功能幹細胞的培養的成本很高的原因之一。 在這個研究中把血管生成之纖維母細胞生長因子(FGF-2)嫁接在培養皿上有兩個目的。其一是讓細胞培養中減少培養液中FGF-2的用量；其二是讓生長因子嫁接在表面以至於可以使用比培養液懸浮的生長因子單位密度還要低還可以維持細胞的多能性。那為了確保實驗室成功的我們使用另外一種沒有FGF-2的培養液去培養細胞。目前使用兩種水凝膠來當作基底，嫁接了半胱氨酸與寡肽。其中生長因子會與交聯劑鍵結後與半胱氨酸鍵結於水凝膠表面上。在目前的實驗中我們已經可以維持細胞的多能性且讓細胞可以培養超過代。我們堅信我們開發的材料表面應該是可以讓人類多功能幹細胞在培養中保持多能性。 短期目標是能讓人類多功能幹細胞能在生長因子嫁接的表面上維持多能性，最終目標是能夠嫁接不同生長因子促進人類多功能幹細胞分化成特定的細胞。 ;Human embryonic stem cells (hESCs) are an attractive prospect for regenerative medicine and tissue engineering because of their pluripotency to differentiate into different types of cells. Therefore, how to culture hPSCs has been to consider a very critical issues. Typically, the culture medium of hESCs contains growth factors such as FGF-2 and TGF-β1, which should be stored at -20 ~ -80 degree to prevent denaturation of the growth factors. This process is leading to the high cost of hESC culture medium. In this experiment, we designed hESC culture dishes immobilized with FGF-2 to reduce the usage of FGF-2 in the culture medium. PVA-IA and CMC hydrogels were grafted with cysteine, which enables to graft the oligopeptide (VN2C) and growth factor (FGF-2) via crosslinker of PEG-SPDP. hESCs (H9) are expected to proliferate and maintain their pluripotency on modified hydrogel surface grafted with FGF-2 in the medium without using FGF-2. To verify this idea, hESCs were cultured on FGF-2 immobilized surface in Essential 6 cell culture medium plus TGF-β1, which corresponds to Essential 8 cell culture medium minus FGF-2. We added Essential 8 medium at first day to stabilize the hESCs to attach on the surface. hESCs culture on CMC-VN2C-FGF surface were found to keep their pluripotency after long term cultivation (>5 passages). It should be a promising surface, which is immobilized growth factor on cell culture dishes for reducing usage of growth factor such as FGF-2 in the culture medium of hESCs as well as human induced pluripotent stem cells (hiPSCs). The next step is to immobilized the growth factors on the surface to control the hESCs differentiation into specific lineages of the cells.
