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IL-1调节破骨细胞生成的新奇机制

2012-04-10 唐宾泽 生物谷

       IL-1是一个炎症有关的细胞因子。在各种病理条件下,IL-1被发现与骨质疏松有关。研究表明,其促进了破骨细胞的形成、生长以及功能发挥。最近,美国阿拉巴马大学Suzanne M. Michalek等人发现,单独的IL-1就可以有效的延长破骨细胞的生存,同时激活破骨细胞的功能,而且IL-1调节破骨细胞生成需要NF-&k

       IL-1是一个炎症有关的细胞因子。在各种病理条件下,IL-1被发现与骨质疏松有关。研究表明,其促进了破骨细胞的形成、生长以及功能发挥。最近,美国阿拉巴马大学Suzanne M. Michalek等人发现,单独的IL-1就可以有效的延长破骨细胞的生存,同时激活破骨细胞的功能,而且IL-1调节破骨细胞生成需要NF-κB的受体活化剂的帮助。相关论文发表在3月13日的美国《生化周刊》(JBC)上。

       一直以来,依赖RANKL的IL-1调节破骨细胞生成的分子基础还未可知。本次研究表明:虽然IL-1不能激活破骨细胞基因编码的基质金属蛋白酶9(MMP9),组织酶K(Ctsk),抗酒石酸磷酸酶(Car2)在骨髓巨噬细胞(BMMs)中的表达,RANKL可以致使这些破骨细胞基因应答于IL-1。

       实验进一步证明,单独的IL-1不能够引起NFATc1(一中对破骨细胞生成的主导性转录调节因子)的表达,但是,如果有一定水平的RANKL或者RANKL预处理物的话,IL-1在BMMs中可以上调NFATc1的表达。

       最后,本次实验发现,一种已知的,在IL-1RI 信号通路中的关键部件--MyD88,通过其上调破骨细胞标记以及NFATc1基因的表达,在IL-1调节的破骨细胞生成中起着至关重要的作用。

       这项研究发现了IL-1调节破骨细胞生成的新奇机制,支持了IVVY模体作为治疗炎症骨骼流失的最具治疗潜力的位点这一观点。

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    2012-04-12 jjjiang0202
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