Medical Biology - Research Publications

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Start date: 2016 × End date: 2016 × Author: Jain, Reema ×

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    The linear ubiquitin chain assembly complex: a new function in thymic T cell differentiation and regulatory T cell homeostasis
    Teh, C ; Lalaoui, N ; Jain, R ; Policheni, A ; Heinlein, M ; Alvarez-Diaz, S ; Rieser, E ; Deuser, S ; Koay, H-F ; Hu, Y ; Kupresanin, F ; O'Reilly, L ; Godfrey, D ; Smyth, G ; Bouillet, P ; Strasser, A ; Walczak, H ; Silke, J ; Gray, D (WILEY-BLACKWELL, 2016-08)
    The linear ubiquitin chain assembly complex (LUBAC) is essential for innate immunity in mice and humans, yet its role in adaptive immunity is unclear. Here we show that the LUBAC components HOIP, HOIL-1 and SHARPIN have essential roles in late thymocyte differentiation, FOXP3+ regulatory T (Treg)-cell development and Treg cell homeostasis. LUBAC activity is not required to prevent TNF-induced apoptosis or necroptosis but is necessary for the transcriptional programme of the penultimate stage of thymocyte differentiation. Treg cell-specific ablation of HOIP causes severe Treg cell deficiency and lethal immune pathology, revealing an ongoing requirement of LUBAC activity for Treg cell homeostasis. These data reveal stage-specific requirements for LUBAC in coordinating the signals required for T-cell differentiation.
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    Ubiquitin ligase MARCH 8 cooperates with CD83 to control surface MHC II expression in thymic epithelium and CD4 T cell selection
    Liu, H ; Jain, R ; Guan, J ; Vuong, V ; Ishido, S ; La Gruta, NL ; Gray, DH ; Villadangos, JA ; Mintern, JD (ROCKEFELLER UNIV PRESS, 2016-08-22)
    Major histocompatibility complex class II (MHC II) expression is tightly regulated, being subjected to cell type-specific mechanisms that closely control its levels at the cell surface. Ubiquitination by the E3 ubiquitin ligase MARCH 1 regulates MHC II expression in dendritic cells and B cells. In this study, we demonstrate that the related ligase MARCH 8 is responsible for regulating surface MHC II in thymic epithelial cells (TECs). March8(-/-) mice have elevated MHC II at the surface of cortical TECs and autoimmune regulator (AIRE)(-) medullary TECs (mTECs), but not AIRE(+) mTECs. Despite this, thymic and splenic CD4(+) T cell numbers and repertoires remained unaltered in March8(-/-) mice. Notably, the ubiquitination of MHC II by MARCH 8 is controlled by CD83. Mice expressing a mutated form of CD83 (Cd83(anu/anu) mice) have impaired CD4(+) T cell selection, but deleting March8 in Cd83(anu/anu) mice restored CD4(+) T cell selection to normal levels. Therefore, orchestrated regulation of MHC II surface expression in TECs by MARCH 8 and CD83 plays a major role in CD4(+) T cell selection. Our results also highlight the specialized use of ubiquitinating machinery in distinct antigen-presenting cell types, with important functional consequences and implications for therapeutic manipulation.
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    Linear ubiquitin chain assembly complex coordinates late thymic T-cell differentiation and regulatory T-cell homeostasis
    Teh, CE ; Lalaoui, N ; Jain, R ; Policheni, AN ; Heinlein, M ; Alvarez-Diaz, S ; Sheridan, JM ; Rieser, E ; Deuser, S ; Darding, M ; Koay, H-F ; Hu, Y ; Kupresanin, F ; O'Reilly, LA ; Godfrey, DI ; Smyth, GK ; Bouillet, P ; Strasser, A ; Walczak, H ; Silke, J ; Gray, DHD (NATURE PUBLISHING GROUP, 2016-11-18)
    The linear ubiquitin chain assembly complex (LUBAC) is essential for innate immunity in mice and humans, yet its role in adaptive immunity is unclear. Here we show that the LUBAC components HOIP, HOIL-1 and SHARPIN have essential roles in late thymocyte differentiation, FOXP3+ regulatory T (Treg)-cell development and Treg cell homeostasis. LUBAC activity is not required to prevent TNF-induced apoptosis or necroptosis but is necessary for the transcriptional programme of the penultimate stage of thymocyte differentiation. Treg cell-specific ablation of HOIP causes severe Treg cell deficiency and lethal immune pathology, revealing an ongoing requirement of LUBAC activity for Treg cell homeostasis. These data reveal stage-specific requirements for LUBAC in coordinating the signals required for T-cell differentiation.