美國科學家表示,,在新近完成的研究中,他們將普通循環(huán)血液中的細胞經(jīng)過重組,,獲得了與胚胎干細胞從分子和功能上難以區(qū)分的細胞,。該研究為人們提供了快速得到干細胞源的途徑以及獲取胚胎干細胞的替代方法,被譽為革命性的成果。相關論文發(fā)表于《血液》雜志,。
長期以來,,人們始終期望胚胎干細胞能作為治療多種疾病的途徑。然而,,對于它們的研究和利用一直是人們在政治和倫理方面具有爭議的問題,。
在新完成的研究中,為生成誘導多能干細胞,,研究人員先從26歲男性志愿者那里采集到血液,,并將血液中只生產(chǎn)血細胞的干細胞——CD34+細胞分離出來,然后將它們放在添加了生長因子的環(huán)境中培養(yǎng)6天,,以增加它們的數(shù)目,。在CD34+細胞培養(yǎng)期間,研究人員用攜帶重組因子的病毒感染它們,,于是通常在胚胎干細胞中表達的基因?qū)D34+細胞重新設置(reset)成胚胎狀態(tài),。兩周后,培養(yǎng)環(huán)境中出現(xiàn)了物理特性同胚胎干細胞相似的細胞,。
為了解這些細胞是否從功能上也同胚胎干細胞類似,,研究人員決定對CD34+的誘導多能干細胞的細胞線進行分析,看看它們帶不帶有干細胞的“標識”,。結(jié)果他們發(fā)現(xiàn),,誘導多能干細胞表達出了與胚胎干細胞相同的“標識”,并且具有分化成不同特殊類型細胞的能力,。
研究主要報告人,、波士頓兒童醫(yī)院霍華德休斯醫(yī)學研究所研究人員喬治·戴利博士表示,新的研究結(jié)果證明,,人類血液中的細胞能夠轉(zhuǎn)變成干細胞,。由于血液十分容易獲得,因此將其轉(zhuǎn)換成多能干細胞以得到針對病人的特殊干細胞提供了方便的途徑,。他認為,,干細胞是重要的研究工具,有朝一日將用于治療人類多種疾病,。(生物谷Bioon.com)
生物谷推薦原始出處:
Blood March 18, 2009; DOI 10.1182/blood-2009-02-204800.
Generation of induced pluripotent stem cells from human blood
Yuin-Han Loh, Suneet Agarwal, In-Hyun Park, Achia Urbach, Hongguang Huo, Garrett C. Heffner, Kitai Kim, Justine D. Miller, Kitwa Ng, and George Q. Daley*
1 Department of Medicine, Division of Pediatric Hematology Oncology, Children's Hospital Boston, and Dana-Farber Cancer Institute, Boston, MA, United States
2 Harvard Stem Cell Institute, Cambridge, MA, United States
3 Howard Hughes Medical Institute, Boston, MA, United States
4 Division of Hematology, Brigham and Women's Hospital, Boston, MA, United States
Human dermal fibroblasts obtained by skin biopsy can be reprogrammed directly to pluripotency by the ectopic expression of defined transcription factors. Here, we describe the derivation of induced pluripotent stem (iPS) cells from CD34+ mobilized human peripheral blood cells using retroviral transduction of OCT4/ SOX2/ KLF4/ MYC. Blood derived human iPS cells are indistinguishable from human embryonic stem (ES) cells with respect to morphology, expression of surface antigens and pluripotency-associated transcription factors, DNA methylation status at pluripotent cell-specific genes, and the capacity to differentiate in vitro and in teratomas. The ability to reprogram cells from human blood will allow the generation of patient-specific stem cells for diseases in which the disease-causing somatic mutations are restricted to cells of the hematopoietic lineage.