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Deprecated: Implicit conversion from float 227.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Eur+J+Immunol 2013 ; 43 (1): 194-208 Nephropedia Template TP
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Syntaxin 11 is required for NK and CD8+ T-cell cytotoxicity and neutrophil degranulation #MMPMID23042080
D?Orlando O; Zhao F; Kasper B; Orinska Z; Müller J; Hermans-Borgmeyer I; Griffiths GM; Zur Stadt U; Bulfone-Paus S
Eur J Immunol 2013[Jan]; 43 (1): 194-208 PMID23042080show ga
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-? 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-?. 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.