Syntaxin 11 is required for NK and CD8⁺ T-cell cytotoxicity and neutrophil degranulation.

Syntaxin 11 is required for NK and CD8⁺ T-cell cytotoxicity and neutrophil degranulation.
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DOI:
10.1002/eji.201142343
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发表时间:
2013-01
影响因子:
5.4
通讯作者:
Bulfone-Paus S
Bulfone-Paus S
中科院分区:
医学3区
文献类型:
--
作者:
D'Orlando O;Zhao F;Kasper B;Orinska Z;Müller J;Hermans-Borgmeyer I;Griffiths GM;Zur Stadt U;Bulfone-Paus S

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突触融合蛋白 11 (STX11) 控制囊泡运输,是胞吐作用的关键参与者。由于 Stx11 突变与家族性噬血细胞性淋巴组织细胞增多症 (FHL-4) 存在因果关系,因此我们想澄清 STX11 对于关键免疫细胞群是否具有重要的功能。这是在从新生成的 Stx11-/- 小鼠获得的原代细胞中进行的研究。我们的数据显示,STX11 不仅在不同的免疫细胞中广泛表达,而且在 LPS 或 IFN-γ 处理后也会被诱导表达。然而,Stx11 缺乏并不影响巨噬细胞的吞噬功能和细胞因子分泌、肥大细胞激活或 DC 的抗原呈递。相反,STX11 选择性地控制 NK 中的淋巴细胞细胞毒性和活化的 CD8+ T 细胞以及中性粒细胞中的脱颗粒。尽管复合物形成伙伴 MUNC18-2 和 VTI1B 的激活、成熟和表达相当,但 Stx11-/- NK 细胞和 CTL 显示脱颗粒受损。此外,Stx11-/- CTL 和 NK 细胞产生异常水平的 IFN-γ。由于功能重建可以挽救 Stx11-/- CTL 的缺陷表型,因此我们认为 STX11 在控制淋巴细胞的细胞毒性、细胞因子的产生和分泌方面具有直接、特异性和关键的作用。最后,我们证明这些小鼠是剖析 STX11 在囊泡运输和分泌中的作用的非常有用的工具。
Syntaxin 11 (STX11) controls vesicular trafficking and is a key player in exocytosis. Since Stx11 mutations are causally associated with a Familial Hemophagocytic Lymphohistiocytosis (FHL-4), we wanted to clarify whether STX11 is functionally important for key immune cell populations. This was studied in primary cells obtained from newly generated Stx11-/- mice. Our data revealed that STX11 is not only widely expressed in different immune cells, but also induced upon LPS or IFN-γ treatment. However, Stx11 deficiency does not affect macrophage phagocytic function and cytokine secretion, mast cell activation, or antigen presentation by DC. Instead, STX11 selectively controls lymphocyte cytotoxicity in NK and activated CD8+ T cells and degranulation in neutrophils. Stx11-/- NK cells and CTL show impaired degranulation, despite a comparable activation, maturation and expression of the complex-forming partners MUNC18-2 and VTI1B. In addition, Stx11-/- CTL and NK cells produce abnormal levels of IFN-γ. Since functional reconstitution rescues the defective phenotype of Stx11-/- CTL we suggest a direct, specific and key role of STX11 in controlling lymphocyte cytotoxicity, cytokine production and secretion. Finally, we show that these mice are a very useful tool for dissecting the role of STX11 in vesicular trafficking and secretion.