虽然多细胞生物的很多不同细胞类型一旦分化之后保持稳定对这些生物的成功很重要,但在通过将体细胞暴露于一种所谓的“转录因子鸡尾酒”来生成诱导多能干(iPS)细胞方面所取得的进展却凸显了这样一个事实:几乎任何细胞都有被重新编程的潜力。这便提出了一个问题;细胞类型之间的相互转换是因生理原因出现的,还是在疾病背景下出现的?
Thomas Graf 和Tariq Enver利用来自血液细胞系的例子来说明转录因子转分化(transdifferentiation)的原理,他们得出的结论是,转分化从根本上来说是一个与分化类似、与iPS重新编程不同的过程。他们假设,一个细胞类型向另一个的转化可以作为一个正常发育过程发生;同时他们还猜测了在再生医学中对细胞系进行强行重新编程的前景。(生物谷Bioon.com)
生物谷推荐原始出处:
Nature 462, 587-594 (3 December 2009) | doi:10.1038/nature08533
Forcing cells to change lineages
The ability to produce stem cells by induced pluripotency (iPS reprogramming) has rekindled an interest in earlier studies showing that transcription factors can directly convert specialized cells from one lineage to another. Lineage reprogramming has become a powerful tool to study cell fate choice during differentiation, akin to inducing mutations for the discovery of gene functions.