NgR1 and NgR3 are receptors for chondroitin sulfate proteoglycans.

NgR1 and NgR3 are receptors for chondroitin sulfate proteoglycans.
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DOI:
10.1038/nn.3070
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发表时间:
2012-03-11
影响因子:
25
通讯作者:
--
中科院分区:
医学1区
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在成年哺乳动物CNS中,硫酸软骨素蛋白聚糖(CSPG)和髓鞘相关抑制剂(迈斯)稳定神经元结构并限制损伤后的代偿性发芽。Nogo受体家族成员NgR 1和NgR 2与迈斯结合,并参与神经元抑制。在这里,我们表明,NgR 1和NgR 3结合高亲和力的糖胺聚糖部分的蛋白聚糖和参与CSPG抑制培养的神经元。Nogo受体三重突变体(NgR 123 −/−),而不是单一突变体,显示眶后视神经挤压损伤后轴突再生增强。NgR 1和NgR 3(NgR 13 −/−)的联合缺失,而不是NgR 1和NgR 2(NgR 12 −/−),足以模拟NgR 123 −/−再生表型。NgR 13 −/−小鼠的再生通过同时切除RPTPσ(一种已知的CSPG受体)进一步增强。总的来说,这些结果将NgR 1和NgR 3鉴定为新型CSPG受体,证明了CSPG受体之间的功能冗余,并为MAI和CSPG抑制的共同机制提供了意想不到的证据。
In the adult mammalian CNS, chondroitin sulfate proteoglycans (CSPGs) and myelin–associated inhibitors (MAIs) stabilize neuronal structure and restrict compensatory sprouting following injury. The Nogo receptor family members NgR1 and NgR2 bind to MAIs and have been implicated in neuronal inhibition. Here we show that NgR1 and NgR3 bind with high–affinity to the glycosaminoglycan moiety of proteoglycans and participate in CSPG inhibition in cultured neurons. Nogo receptor triple mutants (NgR123−/−), but not single mutants, show enhanced axonal regeneration following retro–orbital optic nerve crush injury. The combined loss of NgR1 and NgR3 (NgR13−/−), but not NgR1 and NgR2 (NgR12−/−), is sufficient to mimic the NgR123−/− regeneration phenotype. Regeneration in NgR13−/− mice is further enhanced by simultaneous ablation of RPTPσ, a known CSPG receptor. Collectively, these results identify NgR1 and NgR3 as novel CSPG receptors, demonstrate functional redundancy among CSPG receptors, and provide unexpected evidence for shared mechanisms of MAI and CSPG inhibition.
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