VAMP4- and VAMP7-expressing vesicles are both required for cytotoxic granule exocytosis in NK cells.

VAMP4- and VAMP7-expressing vesicles are both required for cytotoxic granule exocytosis in NK cells.
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DOI:
10.1002/eji.201141582
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发表时间:
2011-11
影响因子:
5.4
通讯作者:
Strominger, Jack L.
Strominger, Jack L.
中科院分区:
医学3区
文献类型:
--
作者:
Krzewski, Konrad;Gil-Krzewska, Aleksandra;Watts, James;Stern, Joel N. H.;Strominger, Jack L.

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自然杀伤(NK)细胞通过细胞溶解活性消除癌症和病毒感染的细胞。NK细胞细胞毒性的最后一步,导致颗粒内容物的胞吐作用,需要溶解颗粒与质膜融合。来自SNARE家族的蛋白质介导细胞中的膜融合事件。在这里,我们表明,NK细胞表达所有成员的R-SNARE亚组。这些R-SNARE蛋白中的两种,VAMP 4和VAMP 7,在细胞毒性相互作用期间与溶解颗粒共定位。然而,只有VAMP 7与非活化细胞中的含穿孔素颗粒相关联,表明这两种VAMPs在胞吐中具有不同的功能。使用肿瘤NK细胞系YTS和外周NK细胞,我们表明破坏VAMP 4或VAMP 7的表达会抑制溶解颗粒的释放并严重损害NK细胞的细胞毒性活性。此外,VAMP 7而不是VAMP 4参与NK细胞中的IFNγ分泌,表明VAMP 7参与许多融合过程,因此在NK细胞活性中比VAMP 4发挥更普遍的功能。
Natural killer (NK) cells eliminate cancer and virus-infected cells through cytolytic activity. The last step in NK cell cytotoxicity, resulting in exocytosis of granule content, requires fusion of lytic granules with the plasma membrane. Proteins from the SNARE family mediate membrane fusion events in the cell. Here we show that NK cells express all members of the R-SNARE subgroup. Two of these R-SNARE proteins, VAMP4 and VAMP7, co-localize with lytic granules during cytotoxic interactions. However, only VAMP7 associates with perforin-containing granules in non-activated cells, indicating that the two VAMPs have different functions in exocytosis. Using both the tumor NK cell line, YTS, and peripheral NK cells we show that disruption of expression of either VAMP4 or VAMP7 inhibits release of lytic granules and severely impairs NK cell cytotoxic activity. Furthermore, VAMP7 but not VAMP4 is involved in IFNγ secretion in NK cells, indicating that VAMP7 is involved in many fusion processes and thus plays a more general function in NK cell activity than VAMP4.
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