Plexin-B2 Mediates Physiologic and Pathologic Functions of Angiogenin.

Plexin-B2 Mediates Physiologic and Pathologic Functions of Angiogenin.
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DOI:
10.1016/j.cell.2017.10.005
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发表时间:
2017-11-02
期刊:
影响因子:
64.5
通讯作者:
Hu GF
Hu GF
中科院分区:
生物学1区
文献类型:
--
作者:
Yu W;Goncalves KA;Li S;Kishikawa H;Sun G;Yang H;Vanli N;Wu Y;Jiang Y;Hu MG;Friedel RH;Hu GF

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血管生成素(ANG)是一种分泌型核糖核酸酶(RNase),在生长、存活和再生中具有细胞类型和环境特异性作用。虽然这些功能需要受体介导的内吞作用和适当的亚细胞定位,细胞表面受体的身份仍然不确定。在这里,我们表明,丛蛋白B2(PLXNB 2)是血管紧张素在内皮细胞,癌症,神经元,正常造血和白血病干细胞和祖细胞的功能受体。从机制上讲,PLXNB 2介导细胞内RNA加工,有助于ANG的细胞生长、存活和再生能力。针对PLXNB 2上的ANG结合位点产生的抗体在体外和体内限制ANG活性,导致抑制已建立的异种移植肿瘤、ANG诱导的神经发生和神经保护、造血和患者来源的白血病干细胞/祖细胞中促自我更新转录物的水平,以及体内白血病的进展减少。因此,PLXNB 2是ANG的生理和病理功能所必需的,并且在实体和造血系统癌症以及神经退行性疾病中具有显著的治疗潜力。丛蛋白-B2在多种生理和病理背景下充当功能性血管生成素受体,表明ANG-PLXNB 2轴可用于治疗应用。
Angiogenin (ANG) is a secreted ribonuclease (RNase) with cell type- and context-specific roles in growth, survival, and regeneration. Although these functions require receptor-mediated endocytosis and appropriate subcellular localization, the identity of the cell surface receptor remains undefined. Here, we show that plexin-B2 (PLXNB2) is the functional receptor for ANG in endothelial, cancer, neuronal, and normal hematopoietic and leukemic stem and progenitor cells. Mechanistically, PLXNB2 mediates intracellular RNA processing that contribute to cell growth, survival, and regenerative capabilities of ANG. Antibodies generated against the ANG binding site on PLXNB2 restricts ANG activity in vitro and in vivo, resulting in inhibition of established xenograft tumors, ANG-induced neurogenesis and neuroprotection, levels of pro-self-renewal transcripts in hematopoietic and patient-derived leukemic stem/progenitor cells, and reduced progression of leukemia in vivo. PLXNB2 is therefore required for the physiological and pathological functions of ANG and has significant therapeutic potential in solid and hematopoietic cancers and neurodegenerative diseases. Plexin-B2 acts as a functional angiogenin receptor in a variety of physiological and pathological contexts, suggesting that the ANG-PLXNB2 axis could be harnessed for therapeutic applications.
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