Nat Commun:钙离子通道蛋白发挥令人意想不到的作用

2017-03-30 生物谷 生物谷

2017年3月30日讯 /生物谷BIOON/ --近日,来自美国西北大学医学院的科学家们在国际学术期刊Nature Communicaitons上发表了一项新研究,揭示了钙离子释放激活钙离子通道(CRAC)家族的两个蛋白如何通过相互作用控制钙离子流入细胞,进而调节下游免疫应答。科学家们借助小鼠模型探索了ORAI1和ORAI2这两个CRAC通道蛋白如何控制CRAC通道活性和免疫应答。“目前大


近日,来自美国西北大学医学院的科学家们在国际学术期刊Nature Communicaitons上发表了一项新研究,揭示了钙离子释放激活钙离子通道(CRAC)家族的两个蛋白如何通过相互作用控制钙离子流入细胞,进而调节下游免疫应答。

科学家们借助小鼠模型探索了ORAI1和ORAI2这两个CRAC通道蛋白如何控制CRAC通道活性和免疫应答。

“目前大部分研究都聚焦于ORAI1,我们对于ORAI1通道如何开启已经有了一个合理的认识,我们知道该分子特异性表达于免疫细胞,并且如果ORAI1发生失活突变将导致严重的免疫缺陷。同时还存在另外一个相关蛋白ORAI2,如果该分子被过表达也会影响CRAC通道的活性,但是直到现在,该蛋白在天然组织中的确切作用还没有得到完全了解。”文章作者Murali Prakriya教授这样说道。

在这项研究中,科学家们发现ORAI2能够减缓ORAI1引导钙离子的能力。如果将ORAI2蛋白从CRAC通道中去除,科学家们发现钙离子向细胞内的流入显著增加。

更进一步的研究还表明如果同时去除这两个蛋白会引起CRAC通道失去功能,导致T细胞功能受损。除此之外,虽然缺失了这两个蛋白的小鼠会出现免疫应答受损,但是小鼠也受到保护不会发生两种自身免疫疾病——大肠炎和移植物抗宿主疾病,这两种疾病都是由T细胞所介导。

文章作者表示他们的结果揭示了ORAI2如何通过与ORAI1相互作用调节钙离子流量,进而共同控制免疫应答,该研究为免疫相关疾病的治疗提供了新的潜在靶点。(生物谷Bioon.com)

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原始出处:

Martin Vaeth et al. ORAI2 modulates store-operated calcium entry and T cell-mediated immunity, Nature Communications (2017). DOI: 10.1038/ncomms14714 

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    2017-11-15 liuli5079
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    2017-06-21 liye789132251
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当一种特定的病原菌首次攻击身体时,免疫系统中的T细胞协助抵抗它的感染。在清除这种感染后,一些抵抗这种病原菌的T细胞转化为 “记忆”T细胞,而且这些记忆T细胞记住这种病原菌,并且准备好保护身体免受未来的再次感染。之前的研究已发现记忆T细胞是身体保持长期免疫力的关键,但是这些细胞的数量和质量随着时间的推移而下降,从而使得一些人更可能再次受到感染。如