The two‐pore domain K2P channel TASK2 drives human NK‐cell proliferation and cytolytic function

The two‐pore domain K2P channel TASK2 drives human NK‐cell proliferation and cytolytic function
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两孔结构域K2P通道TASK2驱动人NK细胞增殖和溶细胞功能

DOI:
10.1002/eji.201445208
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发表时间:
2015
影响因子:
5.4
通讯作者:
Gross CC
Gross CC
中科院分区:
医学3区
文献类型:
--
作者:
Schulte-Mecklenbeck A;Bittner S;Ehling P;Doring F;Wischmeyer E;Breuer J;Herrmann AM;Wiendl H;Meuth SG;Gross CC

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自然杀伤(NK)细胞是细胞毒性淋巴细胞的一个亚群,在没有事先刺激的情况下识别和杀死肿瘤和病毒感染的细胞。靶细胞的杀伤是一个多步骤的过程,包括与靶细胞的黏附,免疫突触的形成,以及细胞溶解颗粒的极化和释放。不同的钾通道在这个精心安排的过程中的作用仍然知之甚少。目前的研究表明,除了电压门控Kv1.3和钙激活的KCa3.1通道外,人NK细胞还表达两孔结构域K2P通道TASK2(twik相关的酸敏钾通道)。Task2的表达在不同的NK细胞亚群中有所不同,并取决于它们的分化和激活状态。尽管TASK2在TASK2HighCD56brightCD16−和TASK2lowCD56dimCD16+NK细胞中表达不同,但TASK2参与了细胞因子诱导的这两个亚群的增殖和杀伤功能。TASK2在白细胞功能抗原(LFA-1)介导的静息和细胞因子激活的NK细胞与靶细胞的黏附中起关键作用,这是杀伤靶细胞的早期步骤。在以下机制中,TASK2通过静息作用促进NK细胞释放细胞毒颗粒,而不是IL-15诱导的NK细胞。综上所述,我们的数据显示双孔钾通道在NK细胞的激活和效应功能中起着重要的作用。
Natural killer (NK) cells are a subset of cytotoxic lymphocytes that recognize and kill tumor‐ and virus‐infected cells without prior stimulation. Killing of target cells is a multistep process including adhesion to target cells, formation of an immunological synapse, and polarization and release of cytolytic granules. The role of distinct potassium channels in this orchestrated process is still poorly understood. The current study reveals that in addition to the voltage‐gated KV1.3 and the calcium‐activated KCa3.1 channels, human NK cells also express the two‐pore domain K2P channel TASK2 (TWIK‐related acid‐sensitive potassium channel). Expression ofTask2varies among NK‐cell subsets and depends on their differentiation and activation state. Despite its different expression in TASK2highCD56brightCD16−and TASK2lowCD56dimCD16+NK cells, TASK2 is involved in cytokine‐induced proliferation and cytolytic function of both subsets. TASK2 is crucial for leukocyte functional antigen (LFA‐1) mediated adhesion of both resting and cytokine‐activated NK cells to target cells, an early step in killing of target cells. With regard to the following mechanism, TASK2 plays a role in release of cytotoxic granules by resting, but not IL‐15‐induced NK cells. Taken together, our data exhibit two‐pore potassium channels as important players in NK‐cell activation and effector function.
DOI: 10.1073/pnas.0601335103
发表时间: 2006-04-11
影响因子: 11.1
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影响因子: 4.4
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发表时间: 1986
影响因子: 3.1
作者:
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DOI: 10.1073/pnas.83.2.451
发表时间: 1986
影响因子: 11.1
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通讯作者: L. Schlichter;N. Sidell;S. Hagiwara