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首页> 外文期刊>Cellular immunology >Calcineurin-dependent lytic granule exocytosis in NK-92 natural killer cells.
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Calcineurin-dependent lytic granule exocytosis in NK-92 natural killer cells.

机译:NK-92自然杀伤细胞中钙调磷酸酶依赖性裂解颗粒的胞吐作用。

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摘要

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 [M.J. Grybko, J.P. Bartnik, G.A. Wurth, A.T. Pores-Fernando, A. Zweifach, Calcineurin activation is only one calcium-dependent step in cytotoxic T lymphocyte granule exocytosis, J. Biol. Chem. 282 (2007) 18009-18017]. 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-dependentsteps.
机译:细胞毒性T细胞(CTL)和自然杀伤细胞(NKs)都通过释放溶解颗粒的细胞毒性来杀死病毒感染的细胞和肿瘤细胞。我们最近证明了钙调神经磷酸酶在TALL-104人白血病CTL中的溶胞颗粒胞吐作用中的作用[M.J. Grybko,J.P. Bartnik,G.A.沃思(美国) Pores-Fernando,A.Zweifach,钙调神经磷酸酶的活化仅是细胞毒性T淋巴细胞颗粒胞吐作用中钙依赖的一个步骤。化学282(2007)18009-18017]。但是,钙调神经磷酸酶是否在NK裂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组成型活性的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类白血病NK-92细胞的溶解性颗粒胞吐作用。我们的结果表明,钙调神经磷酸酶确实在NK-92细胞中的溶解性颗粒胞吐作用中发挥作用,并且表明,与TALL-104细胞一样,钙可能依赖多个钙依赖性步骤。

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