HkRP3 is a microtubule-binding protein regulating lytic granule clustering and NK cell killing.

HkRP3 is a microtubule-binding protein regulating lytic granule clustering and NK cell killing.
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DOI:
10.4049/jimmunol.1402897
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发表时间:
2015-04-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Billadeau DD
Billadeau DD
中科院分区:
其他
文献类型:
--
作者:
Ham H;Huynh W;Schoon RA;Vale RD;Billadeau DD

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NK细胞通过分泌预先形成的裂解颗粒杀死病毒感染的细胞和癌细胞来提供宿主防御。裂解颗粒朝向靶细胞的极化依赖于完整的微管(MT)网络以及MT马达。我们最近发现,DOCK 8,一个在原发性免疫缺陷综合征中突变的基因,部分通过其对MTOC极化的影响参与NK细胞杀伤。Hook相关蛋白3(HkRP 3)是一种新的DOCK 8和MT结合蛋白。我们进一步表明,HkRP3是存在于溶解颗粒组分,相互作用的动力蛋白马达复合物和MTs。值得注意的是,HkPR3的耗竭损害了NK细胞的细胞毒性,这可能归因于不仅MTOC极性的缺陷,而且还损害了MTOC周围的溶解颗粒的聚集。我们的研究结果表明,在NK细胞介导的杀伤过程中,HkRP3在调节溶解颗粒的聚集和MTOC重新定位中起重要作用。
NK cells provide host defense by killing viral-infected and cancerous cells through the secretion of preformed lytic granules. Polarization of the lytic granules toward the target cell is dependent on an intact microtubule (MT) network as well as MT motors. We have recently shown that DOCK8, a gene mutated in a primary immunodeficiency syndrome, is involved in NK cell killing in part through its effects on MTOC polarization. In this study, we identified Hook-related protein 3 (HkRP3) as a novel DOCK8- and MT-binding protein. We further show that HkRP3 is present in lytic granule fractions, interacts with the dynein motor complex and MTs. Significantly, depletion of HkPR3 impaired NK cell cytotoxicity, which could be attributed to a defect in not only MTOC polarity, but also impaired clustering of lytic granules around the MTOC. Our results demonstrate an important role for HkRP3 in regulating the clustering of lytic granules and MTOC repositioning during the development of NK cell-mediated killing.
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