Blood:在多发性骨髓瘤中,多配体聚糖-1通过提呈Wnts和R脊柱蛋白促进Wnt/β-catenin信号通路异常激活。

2017-12-07 MedSci MedSci原创

多发性骨髓瘤(MM)的特点是骨髓(BM)中恶性浆细胞的扩增。大多数MMs出现促进增殖的Wnt/β-catenin信号通路异常;但其均缺乏致瘤性的Wnt信号通路的突变,表明该信号通路的激活是通过BM微环境自分泌Wnt配体和(或)旁分泌Wnts。硫酸类肝素蛋白多糖(HSPG)多配体聚糖-1的表达是MM的标志。多配体聚糖-1是MM细胞与其BM壁龛发生复杂的相互作用的关键参与者,通过硫酸类肝素(HS)链调

多发性骨髓瘤(MM)的特点是骨髓(BM)中恶性浆细胞的扩增。大多数MMs出现促进增殖的Wnt/β-catenin信号通路异常;但其均缺乏致瘤性的Wnt信号通路的突变,表明该信号通路的激活是通过BM微环境自分泌Wnt配体和(或)旁分泌Wnts。

硫酸类肝素蛋白多糖(HSPG)多配体聚糖-1的表达是MM的标志。多配体聚糖-1是MM细胞与其BM壁龛发生复杂的相互作用的关键参与者,通过硫酸类肝素(HS)链调控生长因子/细胞因子结合信号。

在本研究中,通过CRISPR/Case9介导敲除以及doxycycline诱导的shRNA控制性敲除EXT1(HS聚合的一个关键酶),研究人员证实在MM中,HS链修饰多配体聚糖-1可调控Wnt信号通路异常激活。

HS缺陷的MM细胞自分泌途径的Wnt/β-catenin信号通路活性显着下调、Wnt信号通路依赖性增殖明显减少。

此外,研究人员证明Wnts与多配体聚糖-1的HS侧链结合,而且该结合可通过Wnt受体Frizzled促进Wnt信号旁分泌性激活。而且,在HS依赖性途径,多配体聚糖-1还与成骨细胞合成的通过激活LGR4从而抑制Frizzled降解的R脊椎蛋白相结合。

总而言之,研究结果表明多配体聚糖-1作为MM细胞中Wnt信号小体的关键组成成分,结合Wnts和R脊椎蛋白,促进Wnt/β-catenin信号通路异常激活、细胞异常生长,提示HS及其合成酶或可作为MM治疗的潜在靶点。

原始出处:

Zemin Ren,et al.Syndecan-1 promotes Wnt/β-catenin signaling in multiple myeloma by presenting Wnts and R-spondins.Blood  2017  :blood-2017-07-797050;  doi: https://doi.org/10.1182/blood-2017-07-797050

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    2018-02-21 jml2009
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    2017-12-09 zhwj
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    2017-12-07 为你把脉

    VB吧不会近近景近景

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