Munc18-2 deficiency causes familial hemophagocytic lymphohistiocytosis type 5 and impairs cytotoxic granule exocytosis in patient NK cells - Archive ouverte HAL Access content directly
Journal Articles Journal of Clinical Investigation Year : 2009

Munc18-2 deficiency causes familial hemophagocytic lymphohistiocytosis type 5 and impairs cytotoxic granule exocytosis in patient NK cells

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Marjorie Côte
  • Function : Author
Mickaël Ménager
  • Function : Author
Catherine Schaffner
  • Function : Author
Fahad Al-Manjomi
  • Function : Author
Musa Al-Harbi
  • Function : Author
Astrid Cariou
  • Function : Author
Ulrich Blank
Gehad El-Ghazali
  • Function : Author

Abstract

Familial hemophagocytic lymphohistiocytosis (FHL) is a genetically heterogeneous autosomal recessive immune disorder characterized by the occurrence of uncontrolled activation of lymphocytes and macrophages infiltrating multiple organs. Disease-causing mutations in the perforin (PRF1; also known as FHL2), Munc13-4 (UNC13D; also known as FHL3), and syntaxin-11 (STX11; also known as FHL4) genes have been identified in individuals with FHL. These genes all encode proteins involved in the cytotoxic activity of lymphocytes. Here, we show that the gene encoding syntaxin-binding protein 2 (Munc18-2; official gene symbol STXBP2) is mutated in another subset of patients with FHL (designated by us as "FHL5"). Lymphoblasts isolated from these patients had strongly decreased STXBP2 protein expression, and NK cells exhibited impaired cytotoxic granule exocytosis, a defect that could be overcome by ectopic expression of wild-type STXBP2. Furthermore, we provide evidence that syntaxin-11 is the main partner of STXBP2 in lymphocytes, as its expression required the presence of STXBP2. Our work shows that STXBP2 deficiency causes FHL5. These data indicate that STXBP2 is required at a late step of the secretory pathway for the release of cytotoxic granules by binding syntaxin 11, another component of the intracellular membrane fusion machinery.

Dates and versions

inserm-02440316 , version 1 (15-01-2020)

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Marjorie Côte, Mickaël Ménager, Agathe Burgess, Nizar Mahlaoui, Capucine Picard, et al.. Munc18-2 deficiency causes familial hemophagocytic lymphohistiocytosis type 5 and impairs cytotoxic granule exocytosis in patient NK cells. Journal of Clinical Investigation, 2009, 119 (12), pp.3765-3773. ⟨10.1172/JCI40732⟩. ⟨inserm-02440316⟩
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