Notch2 genetic fate mapping reveals two previously unrecognized mammary epithelial lineages.

Notch2 genetic fate mapping reveals two previously unrecognized mammary epithelial lineages.
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DOI:
10.1038/ncb2725
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发表时间:
2013-05
影响因子:
21.3
通讯作者:
--
中科院分区:
生物学1区
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Notch信号与许多器官的干细胞和祖细胞命运控制有关。利用条件体内遗传标记,我们追踪了表达Notch2受体旁对话的细胞的命运,并发现了两种以前未被识别的乳腺上皮细胞系的存在,我们称之为S(小)和L(大)。S细胞呈串珠状出现,以独特的重复模式嵌入管腔和基底/肌上皮层之间,而单个或成对的L细胞出现在导管和肺泡细胞之间。长期的谱系追踪和功能研究表明,S和L细胞调节着三级分支的单向和对侧空间位置和肺泡簇的形成。我们的研究结果修订了目前的乳腺上皮细胞等级模型,揭示了迄今为止未描述的调节分支形态发生的机制,并可能对鉴定不同乳腺癌亚型的细胞起源具有重要意义。
Notch signalling is implicated in stem and progenitor cell fate control in numerous organs. Using conditional in vivo genetic labelling we traced the fate of cells expressing the Notch2 receptor paralogue and uncovered the existence of two previously unrecognized mammary epithelial cell lineages that we term S (Small) and L (Large). S cells appear in a bead-on-a-string formation and are embedded between the luminal and basal/myoepithelial layers in a unique reiterative pattern, whereas single or paired L cells appear among ductal and alveolar cells. Long-term lineage tracing and functional studies indicate that S and L cells regulate ipsi- and contralateral spatial placement of tertiary branches and formation of alveolar clusters. Our findings revise present models of mammary epithelial cell hierarchy, reveal a hitherto undescribed mechanism regulating branching morphogenesis and may have important implications for identification of the cell-of-origin of distinct breast cancer subtypes.
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