Calcineurin-dependent lytic granule exocytosis in NK-92 natural killer cells.

Calcineurin-dependent lytic granule exocytosis in NK-92 natural killer cells.
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DOI:
10.1016/j.cellimm.2008.07.004
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发表时间:
2009
影响因子:
4.3
通讯作者:
Zweifach, Adam
Zweifach, Adam
中科院分区:
医学4区
文献类型:
--
作者:
Pores-Fernando, Arun T.;Gaur, Surabhi;Doyon, Michelle Y.;Zweifach, Adam

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细胞毒性T细胞(ctl)和自然杀伤细胞(NKs)通过释放其溶解颗粒的细胞毒性内容物来杀死病毒感染的细胞和肿瘤细胞。我们最近证明了钙调磷酸酶在TALL-104人白血病细胞的溶解颗粒胞吐中的作用。然而,钙调磷酸酶是否在NK溶解颗粒释放中起类似作用尚不清楚。我们使用阻断钙调神经磷酸酶功能的免疫抑制药物和过表达一种组成型活性钙调神经磷酸酶融合蛋白,测试了钙调神经磷酸酶是否参与人白血病NK-92细胞的溶解性颗粒胞吐。我们的研究结果表明,钙调磷酸酶确实在NK-92细胞的溶解颗粒胞吐中发挥作用,并且表明,与TALL-104细胞的情况一样,可能存在多个钙依赖步骤。
Cytotoxic T cells (CTLs) and natural killer cells (NKs) both kill virus-infected cells and tumor cells by releasing the cytoxic contents of their lytic granules. We recently demonstrated a role for calcineurin in lytic granule exocytosis in TALL-104 human leukemic CTLs. However, whether calcineurin plays a similar role in NK lytic granule release is not known. We tested whether calcineurin is involved in lytic granule exocytosis in human leukemic NK-92 cells using immunosuppressive drugs that block calcineurin function and by overexpressing a constitutively active calcineurin fusion protein. Our results indicate that calcineurin does play a role in lytic granule exocytosis in NK-92 cells, and suggest that, as was the case in TALL-104 cells, there are likely to be multiple calcium-dependent steps.
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