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
中科院分区:
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
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.