Intercellular transfer to signalling endosomes regulates an ex vivo bone marrow niche.

Intercellular transfer to signalling endosomes regulates an ex vivo bone marrow niche.
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DOI:
10.1038/ncb1838
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发表时间:
2009-03
影响因子:
21.3
通讯作者:
Lippincott-Schwartz, Jennifer
Lippincott-Schwartz, Jennifer
中科院分区:
生物学1区
文献类型:
--
作者:
Gillette, Jennifer M.;Larochelle, Andre;Dunbar, Cynthia E.;Lippincott-Schwartz, Jennifer

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造血干祖细胞(HSPC)位于骨髓龛中,与成骨细胞的相互作用为其增殖和存活提供了重要线索。在这里,我们使用活细胞成像来表征成骨细胞和造血祖细胞(HPCs)之间的接触部位,以及在该部位导致对小生境维持重要的下游信号传导反应的事件。HPCs与成骨细胞表面通过一个专门的膜结构域,富含CD 63和罗丹明PE。在接触部位,含有这些分子的特定结构域的部分被成骨细胞吸收并内化到SARA阳性信号内体中。这导致成骨细胞下调Smad信号传导并增加基质衍生因子-1(SDF-1)的产生,SDF-1是一种负责HSPC归巢骨髓的趋化因子。这些发现确定了一种机制,涉及细胞间转移到信号内涵体,用于体外成骨细胞龛内的信号传导和重塑事件的靶向调节。
Hematopoietic stem-progenitor cells (HSPCs) reside in the bone marrow niche, where interactions with osteoblasts provide essential cues for their proliferation and survival. Here, we use live cell imaging to characterize both the site of contact between osteoblasts and hematopoietic progenitor cells (HPCs) and events at this site that result in downstream signaling responses important for niche maintenance. HPCs made prolonged contact with the osteoblast surface via a specialized membrane domain enriched in prominin 1, CD63 and rhodamine PE. At the contact site, portions of the specialized domain containing these molecules were taken up by the osteoblast and internalized into SARA-positive signaling endosomes. This caused osteoblasts to downregulate Smad signaling and increase production of stromal-derived factor-1 (SDF-1), a chemokine responsible for HSPC homing to bone marrow. These findings identify a mechanism involving intercellular transfer to signaling endosomes for targeted regulation of signaling and remodeling events within an ex vivo osteoblastic niche.
突变动力蛋白的诱导特异性阻断内吞涂层囊泡的形成。
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