將成體皮膚細胞“重編程”為類似干細胞的技術是一項重大科學發(fā)現(xiàn),,它為研究胚胎干細胞應用潛力提供了一條不受倫理問題阻礙的方法。目前,,有研究者利用成體豬構建了這種重編程干細胞,。由于豬是一種生理上與人類非常相似的大動物,所以該工作為研究這種新型“誘導多能干細胞”(iPS)技術的治療性潛力提供了一種很有價值的模型,。
科學家們已經利用多種動物成功構建iPS細胞,,包括小鼠和人類。這兩種系統(tǒng)都能幫助研究者回答關于這些細胞的許多生物學和遺傳學問題,,但是距離臨床仍存在著障礙,。在未通過動物模型的安全性和有效性檢測之前,不能在人體中檢測這些iPS細胞,,但是由于體型,、生理以及壽命等方面的差異,小鼠并不是一種理想的動物模型,。
中國科學院廣州生物醫(yī)藥與健康研究院裴端卿及其同事們找到了一種更好的臨床前動物模型:豬,。這種大型動物與人類有極為相似的生物學特性,它們在醫(yī)藥領域已經有了不少的貢獻,,如:利用豬胰島素治療糖尿病或利用豬心臟瓣膜進行外科移植,。
該研究小組通過改進現(xiàn)有的iPS技術,成功的利用一種小型藏香豬(其體型小巧,,便于飼養(yǎng)和維護)構建出了干細胞系,。生化分析表明,這些細胞表達的關鍵蛋白質能夠證明它們是“干細胞”,,而且具有分化為其他類型細胞的能力,。
更重要的是,,與其他動物相比,這種豬iPS細胞更容易與人干細胞整合,,這進一步證明了它們在臨床前研究中的價值,。研究者們認為,豬iPS這項令人激動的新興技術的出現(xiàn),,將會使該領域迅速發(fā)展,。(生物谷Bioon.com)
生物谷推薦原始出處:
JBC doi:10.1074/jbc.M109.008938 on April 17, 2009
Generation of induced pluripotent stem cell lines from tibetan miniature pig
Miguel Angel Esteban, Jianyong Xu, Jiayin Yang, Meixiu Peng, Dajiang Qin, Wen Li, Zhuoxin Jiang, Jiekai Chen, Kang Deng, Mei Zhong, Jinglei Cai, Liangxue Lai, and Duanqing Pei1
From the GIBH, China
Induced pluripotent stem cells (iPS) technology appears to be a general strategy to generate pluripotent stem cells from any given mammalian species. So far, iPS cells have been reported for mouse, human, rat and monkey. These four species also have established embryonic stem cell (ESC) lines which serve as gold standard for pluripotency comparisons. Attempts have been made to generate porcine ESC by various means without success. Here we report the successful generation of pluripotent stem cells from fibroblasts isolated from Tibetan miniature pig using a modified iPS protocol. The resulting iPS cell lines more closely resemble human ESC than cells from other species, have normal karyotype, stain positive for alkaline phosphatase, express high levels of ESC-like markers (Nanog, Rex1, Lin28, SSEA4), and can differentiate into teratomas composed of the three germ layers. Since porcine physiology closely resembles human, the iPS cells reported here provide an attractive model to study certain human diseases or assess therapeutical applications of iPS in a large animal model.