一个有趣的现象（附图）

dabai22222

千细胞 发表于 2010-12-24 12:12
3 d' p& N2 j% j' w5 t5 g9 b) z4 |这个让我想到一个以前听到一个讲座; L  J% F% t' E6 A) W
这个现象和接触抑制相关，还有P53通路相关，这个研究者在美国做的这部 ...

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是这篇paper吧
5 V! Y0 D9 {0 h9 N6 \Mouse Fibroblasts Lacking RB1 Function Form Spheres and Undergo Reprogramming to a Cancer Stem Cell Phenotype
3 M: ^' u1 Q9 r9 yActivation of the RB1 pathway triggers the cell-cycle arrest that mediates cell-cell contact inhibition. Accordingly, mutation of all three RB1 family members leads to loss of contact inhibition and outgrowth of fibroblasts into spheres where cell-cell contacts predominate. We present evidence that such outgrowth triggers reprogramming to generate cells with properties of cancer stem cells. Fibroblasts with only a single RB1 mutation remain contact inhibited; however, if this contact inhibition is bypassed by forcing the RB1 /  cells to form spheres in suspension, cells with properties of cancer stem cells are also generated. These cells not only form tumors in nude mice but also generate differentiated cells. We propose that contact inhibition imposed by the RB1 pathway performs an unexpected tumor suppressor function by preventing cell outgrowth into structures where cells with properties of cancer stem cells can be generated from differentiated somatic cells in advancing cancers.