Phagocytic activity of neuronal progenitors regulates adult neurogenesis.

Phagocytic activity of neuronal progenitors regulates adult neurogenesis.
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DOI:
10.1038/ncb2299
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发表时间:
2011-07-31
影响因子:
21.3
通讯作者:
--
中科院分区:
生物学1区
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--
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成年人每天产生成千上万的新神经元,其中只有一小部分存活下来并成为神经回路的一部分;其余的死亡,他们的尸体可能被常驻的吞噬细胞清除。死亡的神经元如何被移除,以及这种清除如何影响神经发生,目前还不清楚。在这里,我们发现了双皮质素(DCX)阳性的神经元祖细胞在成人神经发生过程中意想不到的吞噬作用。我们的体内和离体研究表明,DCX+细胞在神经原性区包含一个重要的吞噬群体。细胞内吞噬蛋白ELMO1促进吞噬受体下游的Rac活化,是DCX+细胞吞噬所必需的。体内基因(elmo1缺失小鼠)或药理学(野生型小鼠)吞噬的破坏导致DCX+细胞摄取减少,神经源性壁龛中凋亡核的积累和神经发生受损。总的来说,这些发现表明了一种范式,其中DCX+神经元前体也作为吞噬细胞,并且它们的吞噬活性对成人大脑中的神经发生至关重要。
Whereas thousands of new neurons are generated daily during adult life, only a fraction of them survive and become part of neural circuits; the rest die, and their corpses are presumably cleared by resident phagocytes. How the dying neurons are removed and how such clearance influences neurogenesis are not well understood. Here, we identify an unexpected phagocytic role for the doublecortin (DCX)-positive neuronal progenitor cells during adult neurogenesis. Our in vivo and ex vivo studies demonstrate that DCX+ cells comprise a significant phagocytic population within the neurogenic zones. Intracellular engulfment protein ELMO1, which promotes Rac activation downstream of phagocytic receptors, was required for phagocytosis by DCX+ cells. Disruption of engulfment in vivo genetically (in Elmo1-null mice) or pharmacologically (in wild-type mice) led to reduced uptake by DCX+ cells, accumulation of apoptotic nuclei in the neurogenic niches and impaired neurogenesis. Collectively, these findings indicate a paradigm wherein DCX+ neuronal precursors also serve as phagocytes, and that their phagocytic activity critically contributes to neurogenesis in the adult brain.
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发表时间: 1998-11-01
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影响因子: 82.9
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DOI: 10.1083/jcb.201004096
发表时间: 2010-06-28
期刊: The Journal of cell biology
影响因子: --
作者:
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通讯作者: Ravichandran KS